JP2009284494A - Transmission method, transmission apparatus, and reception apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the data transmission rate by multiplexing and transmitting a plurality of modulation signals at a transmission apparatus, and demultiplexing and demodulating the transmitted multiplexed modulation signals at a reception apparatus. <P>SOLUTION: In a transmission method for transmitting modulation signals of a plurality of channels to the same frequency band from a plurality of antennas, when a demodulation symbol 101 is inserted in a channel, in another channel symbol 109, the same phase and orthogonal signals in the in-phase-quadrature plane are made to be zero signals. Thus, a plurality of modulation signals are multiplexed and transmitted, and the transmitted multiplexed modulation signals are demultiplexed and demodulated at a reception apparatus, thereby improving the data transmission rate. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transmission method, a transmission device, and a reception device.

  Conventionally, as a transmission method and a reception method, for example, there is a method described in Patent Document 1. FIG. 87 shows a transmission method and a reception method described in Patent Document 1.

  In FIG. 87, the antenna includes a plurality of reception antennas RA1 (8701) to RAP (8703) and a first space-time encoder STE1 (first data block b1 [n, k] (8704)). 8705) and a second space-time encoder STE2 (8707) receiving the second data block b2 [n, k] (8706), respectively, the two encoded signals are inverse fast Fourier transformed. After modulation by the conversion IFFT (8708 to 8711), the four transmission antennas TA1 (8712) to TA4 (8715) transmit OFDM signals.

  Signals transmitted by the antennas TA1 (8712) to TA4 (8715) are received by the reception antennas RA1 (8701) to RAP (8703). The received signals r1 [n, k] (8716) through rp [n, k] (8718) are transformed by fast Fourier transform (FFT) subsystems FFT1 (8719) through FFTp (8721), respectively, to produce a space-time processor. Supplied to STP (8722). The processor STP (8722) supplies the detected signal information to the first and second space-time decoders STD1 (8723) and STD2 (8724). A channel parameter estimator CPE (8725) receives the transformed signal, channel parameter information is determined from the transformed signal, and then a space-time processor STP () for use in decoding the signal. 8722).

JP 2002-44051 A (pages 3-5, 10-11, FIG. 4)

  However, since the conventional configuration does not consider the problems of synchronization and frequency offset between a plurality of channels in the same frequency band, it is possible to ensure the accuracy of channel estimation, which is the most important for separating multiplexed signals. It had the problem of being difficult.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a transmission method and a reception method capable of accurately and easily performing channel estimation from a multiplex modulation signal. is there.

  The present invention is a transmission method for transmitting at least one modulation signal to at least one antenna in the same frequency band, wherein at least one modulation signal is transmitted from at least one antenna at a first time, In the time, the number of modulated signals to be transmitted is a transmission method larger than the number of modulated signals at the first time.

  As described above, according to the present invention, by multiplexing the modulation signals of a plurality of channels on the same frequency, the data transmission speed can be improved, and at the same time, the received multiplexed modulation signal can be easily separated in the receiving apparatus. The effect that it can be obtained.

The figure which shows the frame structure of the channel A and the channel B in the 1st Embodiment of this invention The figure which shows the structure of the transmitter in the 1st Embodiment of this invention The figure which shows the structure of the modulation signal generation part in the 1st Embodiment of this invention. The figure which shows the signal point arrangement | positioning in the in-phase-quadrature plane in the 1st Embodiment of this invention The figure which shows the structure of the receiver in the 1st Embodiment of this invention The figure which shows the relationship between the symbol in the 1st Embodiment of this invention, transmission-path distortion, and a reception orthogonal baseband signal. The figure which shows the frame structure of the channel A and the channel B in the 1st Embodiment of this invention The figure which shows the structure of the receiver in the 2nd Embodiment of this invention The figure which shows the structure of the receiver in the 2nd Embodiment of this invention The figure which shows the transmission path distortion estimation signal in the 2nd Embodiment of this invention. The figure which shows the flame | frame structure of the signal in the 3rd Embodiment of this invention. The figure which shows the structure of the transmitter in the 3rd Embodiment of this invention. The figure which shows the structure of the modulation signal generation part in the 3rd Embodiment of this invention. The figure which shows the relationship of the code | symbol multiplied with the pilot symbol in the 3rd Embodiment of this invention. The figure which shows the structure of the receiver in the 3rd Embodiment of this invention The figure which shows the structure of the transmission-line distortion estimation part in the 3rd Embodiment of this invention. The figure which shows the transmission-line distortion amount in the time-axis in the 3rd Embodiment of this invention. The figure which shows the structure of the receiver in the 4th Embodiment of this invention The figure which shows the structure of the receiver in the 4th Embodiment of this invention The figure which shows the frame structure of the signal in the 5th Embodiment of this invention The figure which shows signal point arrangement | positioning in the in-phase I-quadrature Q plane in the 5th Embodiment of this invention The figure which shows the structure of the modulation signal generation part in the 5th Embodiment of this invention. The figure which shows the structure of the transmission path distortion estimation part in the 5th Embodiment of this invention. The figure which shows the frame structure of the channel A and the channel B in the 6th Embodiment of this invention The figure which shows the structure of the transmitter in the 6th Embodiment of this invention. The figure which shows the structure of the receiver in the 6th Embodiment of this invention The figure which shows the transmission line distortion in the 6th Embodiment of this invention The figure which shows the structure of the transmission-path distortion estimation part and signal processing part in the 6th Embodiment of this invention. The figure which shows the frame structure of the signal in the 7th Embodiment of this invention The figure which shows the frame structure of the signal in the 7th Embodiment of this invention The figure which shows the transmitter of the base station in the 7th Embodiment of this invention The figure which shows the structure of the receiver of the terminal in the 7th Embodiment of this invention. The figure which shows an example of the frame structure in the time-axis in the 8th Embodiment of this invention. The figure which shows an example of the frame structure in the time-axis in the 8th Embodiment of this invention. The figure which shows the structure of the modulation signal generation part in the 8th Embodiment of this invention. The figure which shows the structure of the modulation signal generation part in the 8th Embodiment of this invention. The figure which shows the structure of the receiver in the 8th Embodiment of this invention. The figure which shows the structure of the receiver in the 8th Embodiment of this invention. The figure which shows the structure of the receiver in the 8th Embodiment of this invention. The figure which shows the structure of the receiver in the 8th Embodiment of this invention. The figure which shows the structure of the receiver in the 8th Embodiment of this invention. The figure which shows the structure of the receiver in the 8th Embodiment of this invention. The figure which shows an example of the frame structure in the time-axis in the 9th Embodiment of this invention. The figure which shows an example of the frame structure in the time-axis in the 9th Embodiment of this invention. The figure which shows an example of the frame structure in the time-axis in the 9th Embodiment of this invention. The figure which shows the structure of the modulation signal generation part in the 9th Embodiment of this invention. The figure which shows the structure of the modulation signal generation part in the 9th Embodiment of this invention. The figure which shows the structure of the modulation signal generation part in the 9th Embodiment of this invention. The figure which shows the structure of the modulation signal generation part in the 9th Embodiment of this invention. The figure which shows an example of the frame structure in the time and the frequency axis in the 10th Embodiment of this invention. The figure which shows an example of the frame structure in the time and the frequency axis in the 10th Embodiment of this invention. The figure which shows the structure of the receiver in the 10th Embodiment of this invention. The figure which shows the structure of the receiver in the 10th Embodiment of this invention. The figure which shows the structure of the receiver in the 10th Embodiment of this invention. The figure which shows the structure of the receiver in the 10th Embodiment of this invention. The figure which shows the structure of the receiver in the 10th Embodiment of this invention. The figure which shows the structure of the receiver in the 10th Embodiment of this invention. The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the structure of the receiver in the 11th Embodiment of this invention The figure which shows the frame structure in the 12th Embodiment of this invention. The figure which shows the structure of the information symbol in the 12th Embodiment of this invention. The figure which shows the structure of the information symbol in the 12th Embodiment of this invention. The figure which shows the structure of the information symbol in the 12th Embodiment of this invention. The figure which shows the structure of the transmitter in the 12th Embodiment of this invention. The figure which shows the structure of the receiver in the 12th Embodiment of this invention. The figure which shows the structure of the transmitter in the 12th Embodiment of this invention. The figure which shows the structure of the receiver in the 12th Embodiment of this invention. The figure which shows the structure of the transmitter in the 12th Embodiment of this invention. The figure which shows the flame | frame structure in the 13th Embodiment of this invention. The figure which shows the structure of the transmitter in the 13th Embodiment of this invention. The figure which shows the structure of the control symbol in the 13th Embodiment of this invention. The figure which shows the structure of the receiver in the 13th Embodiment of this invention. The figure which shows the flame | frame structure in the 13th Embodiment of this invention. The figure which shows the frame structure in the 12th Embodiment of this invention. The figure which shows the structure of the control symbol in the 13th Embodiment of this invention. The figure which shows the structure of the control symbol in the 13th Embodiment of this invention. Block diagram showing part of a conventional MIMO-OFDM system

  The transmission method of the present invention is a transmission method of transmitting at least one modulated signal to at least one antenna in the same frequency band, and transmitting at least one modulated signal from at least one antenna at a first time, In the second time, the number of modulated signals to be transmitted is a transmission method larger than the number of modulated signals at the first time.

  Thus, by multiplexing the modulation signals of a plurality of channels on the same frequency, the data transmission speed is improved, and at the same time, the received multiplexed modulation signal can be easily separated in the receiving apparatus.

  In the transmission method of the present invention, the first time is a transmission start time of the modulated signal.

  In the transmission method of the present invention, the modulated signal transmitted at the first time is a symbol for compensating for a frequency offset or a symbol for time synchronization.

  In the transmission method of the present invention, the modulated signal transmitted at the first time is a symbol for transmitting information on the transmission method.

  In the transmission method of the present invention, the modulated signal transmitted at the second time is a symbol for transmitting data.

  The transmission method of the present invention is a transmission method for transmitting at least one modulated signal in the same frequency band with at least one antenna, and relates to a radio wave propagation environment corresponding to each antenna of a communication partner having at least one antenna. Based on the information, a first transmission method for transmitting at least one modulated signal from at least one antenna, and a second number of modulated signals to be transmitted are greater than the number of modulated signals in the first transmission method. The transmission method is selected.

  In the transmission method of the present invention, the modulated signal is transmitted by a transmission apparatus having the at least one antenna.

  The transmitting apparatus according to the present invention includes a first frame configuration signal indicating a frame configuration of at least one modulation signal transmitted from at least one antenna, and the number of modulation signals transmitted is the first frame configuration signal. A frame configuration signal generation unit that generates any one of the second frame configuration signals indicating a frame configuration that is greater than the number of modulation signals in the modulation signal, and a modulation signal that generates a modulation signal from transmission data according to the frame configuration signal The generator includes a generation unit and at least one antenna that transmits the at least one modulated signal to the same frequency band.

  In the transmission apparatus of the present invention, the first frame configuration signal is used when transmission of the modulated signal is started.

  In the transmitting apparatus of the present invention, the modulation signal generated by the first frame configuration signal is a symbol for compensating for a frequency offset or a symbol for time synchronization.

  In the transmission apparatus of the present invention, the modulation signal generated by the first frame configuration signal is a symbol for transmitting information related to a transmission method.

  Further, the transmission apparatus of the present invention has a configuration in which the frame configuration signal generation unit determines a frame configuration signal to be generated based on information on a radio wave propagation environment corresponding to each antenna of a communication partner having at least one antenna. is there.

  Also, the transmission method of the present invention is a transmission method for transmitting modulated signals of a plurality of channels in the same frequency band from a plurality of antennas, and a symbol for demodulation is inserted into a predetermined channel, and this demodulation is performed. The symbols of the other channels at the time when the symbol is inserted are signals in which the in-phase and quadrature signals are both zero in the in-phase-quadrature plane.

  Thus, by multiplexing the modulation signals of a plurality of channels on the same frequency, the data transmission speed is improved, and at the same time, the symbols for demodulation are not time-multiplexed, so that the demodulated symbols can be easily separated by the receiving apparatus. Therefore, channel estimation can be easily performed.

  In the transmission method of the present invention, a plurality of symbols for demodulation to be inserted into a frame are continuously inserted.

  As a result, the symbol for demodulation is resistant to noise, so that the channel estimation accuracy in the receiving apparatus is improved and the transmission quality of data is improved.

  In the transmission method of the present invention, the symbols for demodulation are arranged at the same time of each channel, and the symbols for demodulation of each channel are orthogonal to each other.

  Accordingly, since the symbols for demodulation orthogonal to each other are used, the symbols for demodulation can be easily separated and channel estimation can be performed by the receiving apparatus.

  The transmission method of the present invention is a transmission method of transmitting modulated signals of a plurality of channels in the same frequency band from a plurality of antennas, and a symbol for demodulation is applied to a predetermined channel in an OFDM frame configuration. The symbol of the other channel of the subcarrier at the time of insertion and insertion of the symbol for demodulation is a signal whose in-phase and quadrature signals are both zero in the in-phase-quadrature plane.

  As a result, by multiplexing the modulation signals of a plurality of channels on the same frequency, the data transmission speed is improved, and at the same time, symbols for demodulation are transmitted independently in time. Channel estimation can be performed, and multiple signals can be separated.

  In the transmission method of the present invention, the signal point amplitude in the in-phase-orthogonal plane of the demodulation symbol inserted into the frame is larger than the signal point amplitude of the modulation scheme.

  As a result, the symbol for demodulation is resistant to noise, so that the channel estimation accuracy in the receiving apparatus is improved and the transmission quality of data is improved.

  In the transmission method of the present invention, symbols for estimating transmission path variations are inserted into the frame structure of each transmission signal transmitted from each transmission antenna of a plurality of transmission antennas so that the symbols are arranged at the same time. Are multiplied by codes that are orthogonal to each other.

  As a result, the data transmission speed is improved by multiplexing the modulated signals of a plurality of channels on the same frequency, and at the same time, the symbols for estimating the transmission path fluctuation can be easily obtained by using the orthogonal code. Therefore, channel estimation can be easily performed.

  Further, in the transmission method of the present invention, the transmission power of symbols for estimating transmission path fluctuations is larger than the transmission power of other symbols.

  As a result, the symbol for demodulation is resistant to noise, so that the channel estimation accuracy in the receiving apparatus is improved and the transmission quality of data is improved.

  The transmission method of the present invention is a transmission method for transmitting modulated signals of a plurality of channels in the same frequency band from a plurality of antennas, and is a control symbol only for a transmission signal transmitted from a predetermined antenna. It is included.

  Furthermore, in the transmission method of the present invention, at the time when the control symbol is transmitted, the in-phase and quadrature signals in the in-phase / quadrature plane of signals transmitted from other antennas are zero signals.

  In the transmission method of the present invention, the symbol for this control is a symbol for time synchronization.

  In the transmission method of the present invention, the symbol for this control is a symbol for estimating the frequency offset.

  As a result, by multiplexing the modulation signals of a plurality of channels on the same frequency, the data transmission speed is improved, and at the same time, the receiving apparatus uses symbols and frequencies for estimating time synchronization transmitted from one channel from the transmitting apparatus. By receiving the symbol for estimating the offset, it is possible to estimate the frequency offset for the signals of a plurality of channels, and thus the frequency offset estimation unit in the receiving apparatus can be simplified.

  In the transmission method of the present invention, the transmission method of the present invention uses either the spread spectrum communication method or the OFDM method.

  Further, the transmission method of the present invention is a transmission method in which a modulated signal of a spread spectrum communication system of a plurality of channels in the same frequency band is transmitted from a plurality of antennas. The channel signals are multiplexed and only the control channel signal is transmitted.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the receiving apparatus receives a symbol for estimating time synchronization transmitted from one channel from the transmitting apparatus. Since it is possible to acquire time synchronization for signals of a plurality of channels, it is possible to acquire time synchronization by arranging the time synchronization unit in the receiving apparatus only in one antenna unit, and the circuit Can be simplified.

  Also, the transmission method of the present invention is a transmission method in which modulated signals of a spread spectrum communication system of a plurality of channels in the same frequency band are transmitted from a plurality of antennas, and the modulation signal of the control channel is transmitted from only one antenna. .

  Further, in the transmission method of the present invention, the time for transmitting a transmission signal from only one antenna exists in a plurality of times.

  In the transmission method of the present invention, a plurality of times exist at the start of communication.

  As a result, by multiplexing the modulation signals of multiple channels on the same frequency, the data transmission speed is improved, and at the same time, radio control procedures such as frequency offset estimation, synchronization, and communication method determination can be performed from one antenna. By using the transmitted signal, it can be performed accurately, whereby the quality of data and the transmission speed can be optimized.

  A transmission apparatus of the present invention is a transmission apparatus that transmits modulated signals of a plurality of channels in the same frequency band from a plurality of antennas, a frame configuration generation unit that inserts a symbol for demodulation into a predetermined channel, A modulation signal generation unit that performs modulation in accordance with a signal from the frame configuration generation unit.

  In the transmission apparatus of the present invention, the frequency source of the radio unit that outputs a radio signal to each antenna is the same.

  As a result, by multiplexing the modulation signals of a plurality of channels on the same frequency, the data transmission speed is improved, and at the same time, by using a common frequency source, each reception signal received by each antenna is received by the receiving apparatus. Since the frequency offset amount is common, the frequency offset of all the received signals is estimated by estimating the frequency offset from one received signal, and the frequency offset estimating circuit can be simplified.

  The receiving apparatus of the present invention includes a transmission path fluctuation estimation unit that estimates a channel fluctuation of the channel from the demodulation symbol inserted in the frame of each channel of the received signal transmitted by the transmission method of the present invention. And a signal processing unit that receives the transmission path fluctuation estimation signal and the reception signal of each channel as input, separates them into reception signals of each channel, and outputs them.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the symbols for demodulation can be easily separated by the receiving apparatus or have resistance against noise. Thus, channel estimation in the receiving apparatus is facilitated, or channel estimation accuracy is improved and data transmission quality is improved.

  In the receiving apparatus of the present invention, the frequency source of the radio unit for inputting the radio signal from each antenna is the same.

  Thereby, since the frequency offset amount of each received signal received by each antenna is common in the receiving apparatus by making the frequency source common, all frequency offsets are estimated by one received signal, Since the frequency offset of the received signal is estimated, the frequency offset estimation circuit can be simplified.

  Further, the receiving apparatus of the present invention includes a receiving antenna that receives a received signal transmitted by the transmitting method of the present invention, and a transmission path fluctuation from a symbol that estimates the transmission path fluctuation inserted in the frame of the received signal. A transmission path fluctuation estimation unit for estimating the transmission path fluctuation estimation signal from the transmission path fluctuation estimation unit corresponding to each receiving antenna, and a signal that outputs the received signal after separating it into a received signal for each transmitting antenna And a processing unit.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the best condition is obtained by selecting the antenna used for demodulation using the phase difference and the electric field strength as parameters. Since an antenna can be selected, data transmission quality is improved and propagation path estimation can be easily performed.

  The receiving apparatus of the present invention also includes means for receiving a signal transmitted by the transmitting method of the present invention and outputting it as a received signal, and a symbol for demodulation inserted in a channel frame included in the received signal. A transmission path fluctuation estimation section for estimating the transmission path fluctuation of the channel, and a signal processing section for separating the transmission path fluctuation estimation signal for each channel and the reception signal into reception signals for each channel and outputting them. To do.

  As a result, by multiplexing the modulation signals of a plurality of channels on the same frequency, the data transmission speed is improved, and at the same time, the symbols are used for demodulation orthogonal to each other. Can be separated and channel estimation can be performed.

  Further, the receiving apparatus of the present invention receives a signal transmitted by the transmission method of the present invention and outputs it as a received signal, and a symbol for demodulation inserted in a channel frame in the received signal, A channel fluctuation estimator that estimates channel fluctuation for each subcarrier, and a channel fluctuation estimation signal for each channel and a received signal for each subcarrier, and separates it into a received signal for each channel. And a signal processing unit for outputting.

  As a result, by multiplexing the modulation signals of a plurality of channels on the same frequency, the data transmission speed is improved, and at the same time, symbols for demodulation are transmitted independently in time. Channel estimation can be performed, and multiple signals can be separated.

  The receiving device of the present invention is a receiving device that receives the modulated signal transmitted from the transmitting device by the transmitting method of the present invention, and is received by a plurality of antennas and one of the plurality of antennas. A synchronization unit that performs time synchronization with the transmission device from the signal is provided.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the receiving device receives a symbol for estimating time synchronization transmitted from one channel from the transmitting device. Since it is possible to acquire time synchronization for signals of a plurality of channels, it is possible to acquire time synchronization by arranging the time synchronization unit in the receiving apparatus only in one antenna unit, and the circuit Can be simplified.

  The receiving device of the present invention is a receiving device that receives the modulated signal transmitted from the transmitting device by the transmitting method of the present invention, and includes a plurality of antennas, and from the received signals corresponding to the plurality of antennas. Each has a synchronizer that performs time synchronization with the transmitter.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the receiving device receives a symbol for estimating time synchronization transmitted from one channel from the transmitting device. By doing so, it is possible to acquire time synchronization for signals of a plurality of channels, and by averaging the time synchronization timing signals obtained from the respective antenna units to obtain timing, estimation accuracy is improved.

  The receiving device of the present invention is a receiving device that receives the modulated signal transmitted from the transmitting device by the transmitting method of the present invention, and is received by a plurality of antennas and one of the plurality of antennas. A frequency offset estimator for estimating a frequency offset with the transmitter from the signal is provided.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the receiving apparatus receives a symbol for estimating the frequency offset transmitted from one channel from the transmitting apparatus. By doing so, it is possible to estimate the frequency offset for the signals of a plurality of channels, it is possible to estimate the frequency offset by arranging the frequency offset estimation unit in the receiving device only in one antenna unit, The circuit can be simplified.

  The receiving apparatus of the present invention is a receiving apparatus that receives a modulated signal transmitted from a transmitting apparatus by the transmitting method of the present invention, and includes a plurality of antennas, and a received signal corresponding to the plurality of antennas. To a frequency offset estimator for estimating a frequency offset with the transmitter.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the reception apparatus receives a symbol for estimating a frequency offset transmitted from one channel from the transmission apparatus. By doing so, it is possible to estimate the frequency offset for the signals of a plurality of channels, so by placing the frequency offset estimation unit in the receiving device in each antenna unit, the frequency offset estimation signal is averaged The frequency offset can be estimated with high accuracy.

  Further, the receiving apparatus of the present invention is characterized in that time synchronization with the transmitting apparatus is obtained by detecting symbols transmitted only in the control channel signal in the transmitting method of the present invention.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the receiving apparatus receives a symbol for estimating time synchronization transmitted from one channel from the transmitting apparatus. Since it is possible to acquire time synchronization for signals of a plurality of channels, it is possible to acquire time synchronization by arranging the time synchronization unit in the receiving apparatus only in one antenna unit, and the circuit Can be simplified.

  Further, in the receiving apparatus of the present invention, the frequency offset estimation unit estimates the frequency offset from the symbols transmitted only in the control channel signal in the transmission method of the present invention.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the frequency offset is estimated by the control channel to insert a special symbol for frequency offset estimation. Since there is no need, the transmission speed does not decrease.

  The transmission method of the present invention is a transmission method for switching between a case where modulated signals of a plurality of channels are transmitted from a plurality of antennas in the same frequency band and a case where a modulated signal of one channel is transmitted from an antenna.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, one channel is used when the radio wave propagation environment is poor, and the modulation of the plurality of channels is performed when the radio wave propagation environment is good. By transmitting a signal, it is possible to achieve both data transmission quality and transmission efficiency by switching the transmission method depending on the radio wave propagation environment.

  In addition, the transmission method of the present invention selects a transmission method for transmitting a modulated signal of one channel from one antenna at the start of communication.

  As a result, by switching between the case of transmitting from one antenna and the case of transmitting from a plurality of antennas, it is possible to achieve both data transmission quality and transmission speed.

  The receiving apparatus of the present invention receives a signal transmitted by the transmission method of the present invention, receives a modulated signal of a plurality of channels in the same frequency band, and a signal transmitted from a plurality of antennas. It has a function of selecting a modulated signal when receiving a signal transmitted from an antenna.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, one channel is used when the radio wave propagation environment is poor, and the modulation of the plurality of channels is performed when the radio wave propagation environment is good. By transmitting a signal, it is possible to achieve both data transmission quality and transmission efficiency by switching the transmission method depending on the radio wave propagation environment.

  In addition, the receiving apparatus of the present invention estimates a plurality of antennas that receive modulated signals of a plurality of channels in the same frequency band, and the received electric field strength of the received signals received by each of the plurality of antennas. A field strength estimation unit that outputs a received field strength estimation signal, a channel variation estimation unit that estimates a channel variation of each channel of each received signal and outputs the channel variation estimation signal, and a predetermined channel of each antenna A phase difference estimation unit that obtains a phase difference of a channel fluctuation estimation signal of a predetermined channel and outputs it as a phase difference signal, a reception quadrature baseband signal of each antenna, and each antenna in each antenna Reception quadrature to separate the channel signal from the received signal with the channel transmission path fluctuation estimation signal, received signal strength estimation signal and phase difference signal as input. Band signal and selects a transmission path fluctuation estimation signals of respective channels and a signal selection unit for outputting.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the best condition is obtained by selecting the antenna used for demodulation using the phase difference and the electric field strength as parameters. Since the antenna can be selected, the data transmission quality is improved.

  The receiving apparatus of the present invention also includes a plurality of receiving antennas that receive a plurality of signals transmitted in the same frequency band from a plurality of spread spectrum communication modulation signals, and reception of received signals received by each of the receiving antennas. An electric field strength estimating unit that estimates the electric field strength and outputs it as a received electric field strength estimation signal for each received signal, and estimates a transmission channel variation estimation signal of the modulation signal of each spread spectrum communication method of each received signal. A transmission path fluctuation estimation unit that outputs a signal, a phase difference estimation section that receives the predetermined transmission path fluctuation estimation signal as input, obtains a phase difference of the predetermined transmission path fluctuation estimation signal, and outputs the phase difference signal, and each received signal Receive quadrature baseband signal, transmission path fluctuation estimation signal, received field strength estimation signal and phase difference signal as input, and separate the signals of each spread spectrum communication system from the received signal Comprising a signal selector which selects and outputs signal quadrature baseband signal and the transmission path variation estimation signal.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the best condition is obtained by selecting the antenna used for demodulation using the phase difference and the electric field strength as parameters. Since an antenna can be selected, data transmission quality is improved and propagation path estimation can be easily performed.

  Further, the receiving apparatus of the present invention includes a plurality of antennas that receive the modulated signals transmitted from the transmitting apparatus by the transmitting method of the present invention, and the time from the received signal to the transmitting apparatus is corresponding to the plurality of antennas. Each has a synchronization unit that performs synchronization and a radio wave propagation environment estimation unit that estimates the radio wave propagation environment from the received signal, and transmits a signal output from the synchronization unit corresponding to the antenna that is estimated to have the best radio wave propagation environment It is a time synchronization signal with the device.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the receiving device receives a symbol for estimating time synchronization transmitted from one channel from the transmitting device. By doing so, time synchronization can be obtained for signals of a plurality of channels, and the most accurate signal of the time synchronization timing signals obtained from each antenna unit is taken out, so that the estimation accuracy is improved.

  Further, the receiving apparatus of the present invention includes a plurality of antennas that receive the modulated signals transmitted from the transmitting apparatus by the transmitting method of the present invention, and the frequency offset between the received signal and the transmitting apparatus corresponding to the plurality of antennas Output from the frequency offset estimator corresponding to the antenna that is estimated to have the best radio wave propagation environment, and the frequency offset estimator that estimates the radio wave propagation environment from the received signal. The frequency offset is removed using the generated signal.

  As a result, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the receiving apparatus receives a symbol for estimating the frequency offset transmitted from one channel from the transmitting apparatus. Therefore, it is possible to estimate frequency offsets for signals of a plurality of channels. Therefore, the frequency offset estimation unit in the receiving device is arranged in each antenna unit, and the frequency obtained by the antenna having the best reception electric field strength. By removing the frequency offset using the offset estimation signal, the frequency offset can be removed with high accuracy.

  The wireless communication device of the present invention includes a plurality of antennas, receives a modulated signal transmitted by a communication partner, estimates a radio wave propagation environment at each antenna, and transmits information on the estimated radio wave propagation environment to the communication partner. To do.

  In addition, the modulated signal received by the wireless communication apparatus of the present invention is one in which the communication partner transmits a transmission signal at a plurality of times from only one antenna among a plurality of antennas.

  In addition, the wireless communication device of the present invention includes a plurality of antennas that receive modulated signals transmitted from a plurality of antennas in a plurality of channels in the same frequency band, and radio wave propagation corresponding to each antenna. And an electric field intensity estimating unit that estimates the environment, and transmits information on the estimated radio wave propagation environment to a communication partner.

  In addition, the wireless communication apparatus of the present invention receives a modulated signal at the start of communication and transmits information on the estimated radio wave propagation environment to the communication partner.

  Further, the wireless communication device of the present invention is a wireless communication device that transmits and receives modulated signals of a plurality of channels in the same frequency band from a plurality of antennas, based on information on a radio wave propagation environment corresponding to each antenna of a communication partner, A transmission method determining unit that selects one of a transmission method for transmitting modulated signals of a plurality of channels from a plurality of antennas in the same frequency band and a transmission method of a modulation signal of one channel from one antenna.

  The radio wave propagation information of the wireless communication apparatus of the present invention is estimated from the modulated signal transmitted at the start of communication.

  In addition, the wireless communication device of the present invention includes a plurality of antennas that receive modulated signals transmitted from a plurality of antennas in a plurality of channels in the same frequency band, and radio wave propagation corresponding to each antenna. An electric field intensity estimating unit for estimating the environment and a transmission method determining unit for determining a transmission method to be transmitted by the communication partner based on information on the radio wave propagation environment are transmitted to the communication partner.

  Further, the modulated signal received by the wireless communication apparatus of the present invention is a signal transmitted by a communication partner from only one antenna among a plurality of antennas at a plurality of times.

  In addition, the wireless communication device of the present invention includes a plurality of antennas for transmitting and receiving modulated signals of spread spectrum communication systems of a plurality of channels in the same frequency band, and a control channel for controlling a radio wave propagation environment corresponding to each antenna from the modulated signals And an electric field intensity estimation unit that estimates the component based on the component of the signal, and transmits information on the estimated radio wave propagation environment to the communication partner.

  In addition, the wireless communication apparatus of the present invention receives the modulated signal at the start of communication and transmits information on the estimated radio wave propagation environment to the communication partner.

  The radio communication apparatus of the present invention is a radio communication apparatus that transmits and receives modulated signals of spread spectrum communication systems of a plurality of channels in the same frequency band from a plurality of antennas. A transmission method for transmitting modulated signals of a plurality of spread spectrum communication systems data channels from a plurality of antennas on the same frequency band, and a modulated signal of a data channel of a spread spectrum communication system from a single antenna. A transmission method determining unit that selects one of the transmission methods to be transmitted;

  The radio wave propagation information of the wireless communication apparatus of the present invention is estimated from the modulated signal transmitted at the start of communication.

  The communication method of the present invention is a communication method for transmitting and receiving modulated signals of a plurality of channels in the same frequency band from a plurality of antennas, a step of transmitting the modulated signal, a communication partner receiving the modulated signal, and the received modulated signal Estimates the radio wave propagation environment corresponding to each antenna, transmits the estimated radio wave propagation environment information, and transmits modulation signals of multiple channels in the same frequency band from multiple antennas based on the radio wave propagation environment information And a step of selecting one of a transmission method for transmitting a modulation signal of one channel from one antenna.

  In the communication method of the present invention, the modulation signal is transmitted at the start of communication.

  The communication method of the present invention includes a step of transmitting a modulated signal in a communication method for transmitting and receiving modulated signals of a spread spectrum communication system of a plurality of channels in the same frequency band from a plurality of antennas. , And estimating the radio wave propagation environment corresponding to each antenna from the received modulation signal, transmitting the estimated radio wave propagation environment information, and the same frequency band based on the radio wave propagation environment information transmitted by the communication partner A transmission method for transmitting a modulation signal of a data channel of a plurality of spread spectrum communication systems from a plurality of antennas, or a transmission method of transmitting a modulation signal of a data channel of a spread spectrum communication system from a single antenna. Selecting.

  In the communication method of the present invention, the modulation signal is transmitted at the start of communication.

  The communication method of the present invention is a communication method for transmitting and receiving modulated signals of a spread spectrum communication system of a plurality of channels in the same frequency band from a plurality of antennas. The signal is received, the radio wave propagation environment at each antenna is estimated from the received signal of the control channel, and the modulation signals of the data channels of multiple spread spectrum communication systems are transmitted to the same frequency band from the information of the estimated radio wave propagation environment. Transmitting information requesting one of a transmission method for transmitting from a transmission method for transmitting a modulated signal of a data signal of one spread spectrum communication method from one antenna, and the communication partner transmits Selecting one of the transmission methods based on the requested information.

  In the communication method of the present invention, the modulation signal is transmitted at the start of communication.

  As a result, the data transmission speed is improved by multiplexing the modulated signals of a plurality of channels on the same frequency, and at the same time, the case of transmitting from one antenna and the case of transmitting from a plurality of antennas are switched depending on the radio wave propagation environment. This makes it possible to achieve both data transmission quality and transmission speed. Also, by performing the procedure first, the optimum communication method can be selected from the beginning.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  Note that the following antenna does not need to be a single antenna, and may be an antenna unit configured by a plurality of antennas.

(Embodiment 1)
In the first embodiment, in the transmission method of multiplexing modulated signals of a plurality of channels in the same frequency band, the symbols of other channels at the time when symbols for demodulation are inserted into a certain channel, A transmission method in which an orthogonal signal is a zero signal, and a transmission device and a reception device in the transmission method will be described.

  FIG. 1 shows an example of a frame configuration of channel A and channel B on the time axis in the present embodiment, where 101, 104, and 107 are pilot symbols in channel A, and 102, 105, and 108 are guard symbols in channel A. , 103, 106 indicate data symbols in channel A, and the data symbols are, for example, symbols modulated by QPSK modulation. 109, 112, and 115 are guard symbols in channel B, 110, 113, and 116 are pilot symbols in channel B, 111 and 114 are data symbols in channel B, and the data symbols are, for example, QPSK modulated And

  Channel A pilot symbol 101 and channel B guard symbol 109 are symbols at the same time. Similarly, channel A guard symbol 102 and channel B pilot symbol 110, channel A data symbol 103 and channel B data symbol 111, channel A pilot symbol 104 and channel B guard symbol 112, and channel A guard symbol. 105 and channel B pilot symbol 113, data symbol 106 and channel B data symbol 114, channel A pilot symbol 107 and channel B guard symbol 115, channel A guard symbol 108 and channel B pilot symbol 116 at the same time. Symbol.

  FIG. 2 shows an example of the configuration of the transmission apparatus according to the present embodiment. Channel A modulation signal generation section 202 receives frame configuration signal 210 and channel A transmission digital signal 201 as input, and has a frame configuration. The modulated signal 203 of channel A is output.

  The channel A radio section 204 receives the channel A modulation signal 203 and outputs a channel A transmission signal 205.

  The channel A power amplifier 206 receives the channel A transmission signal 205, amplifies it, outputs the amplified channel A transmission signal 207, and outputs it as a radio wave from the channel A antenna 208.

  The frame configuration generation unit 209 outputs a frame configuration signal 210.

  The channel B modulation signal generator 212 receives the frame configuration signal 210 and the channel B transmission digital signal 211, and outputs a channel B modulation signal 213 according to the frame configuration.

  The channel B radio unit 214 receives the channel B modulation signal 213 and outputs a channel B transmission signal 215.

  The channel B power amplifying unit 216 receives the channel B transmission signal 215 as input, amplifies and outputs the amplified channel B transmission signal 217, and is output from the channel B antenna 218 as a radio wave.

  FIG. 3 shows an example of the detailed configuration of the modulation signal generators 202 and 212 of FIG. 2. The data symbol modulation signal generator 302 receives the transmission digital signal 301 and the frame configuration signal 311 as an input, and the frame configuration signal 311. Indicates that it is a data symbol, QPSK modulation is performed, and the in-phase component 303 and the quadrature component 304 of the transmission quadrature baseband signal of the data symbol are output.

  Pilot symbol modulation signal generation section 305 receives frame configuration signal 311 as input, and outputs in-phase component 306 and quadrature component 307 of the transmission quadrature baseband signal of the pilot symbol when the frame configuration signal indicates that it is a pilot symbol. To do.

  Guard symbol modulation signal generation section 308 receives frame configuration signal 311 as input, and outputs the in-phase component 309 and quadrature component 310 of the transmission quadrature baseband signal of the guard symbol when the frame configuration signal indicates that it is a guard symbol. To do.

  In-phase component switching section 312 receives in-phase component 303 of the data symbol transmission quadrature baseband signal, in-phase component 306 of the transmission quadrature baseband signal of pilot symbol, in-phase component 309 of the transmission quadrature baseband signal of guard symbol, and frame configuration signal 311. As an input, the in-phase component of the transmission quadrature baseband signal corresponding to the symbol indicated by the frame configuration signal 311 is selected and output as the in-phase component 313 of the selected transmission quadrature baseband signal.

  The orthogonal component switching unit 314 receives the orthogonal component 304 of the data symbol transmission orthogonal baseband signal, the orthogonal component 307 of the transmission orthogonal baseband signal of the pilot symbol, the orthogonal component 310 of the transmission orthogonal baseband signal of the guard symbol, and the frame configuration signal 311. As an input, the orthogonal component of the transmission orthogonal baseband signal corresponding to the symbol indicated by the frame configuration signal 311 is selected and output as the orthogonal component 315 of the selected transmission orthogonal baseband signal.

  The quadrature modulator 316 receives the in-phase component 313 of the selected transmission quadrature baseband signal and the quadrature component 315 of the selected transmission quadrature baseband signal, performs quadrature modulation, and outputs a modulated signal 317.

  FIG. 4 shows signal point arrangement of QPSK (data symbol), pilot symbol, and guard symbol in the in-phase-orthogonal plane, 401 is a signal point of QPSK, 402 is a signal point of pilot symbol, and 403 is a signal of guard symbol. Shows the point.

  FIG. 5 shows an example of the configuration of the receiving apparatus in this embodiment. Radio section 503 receives reception signal 502 received by antenna 501 as input, and in-phase component 504 and quadrature component 505 of the received quadrature baseband signal. Is output.

  Channel A transmission path distortion estimation section 506 receives reception quadrature baseband signals 504 and 505 as input, estimates channel A transmission path distortion, and outputs channel A transmission path distortion estimation signal 507.

  Channel B transmission path distortion estimation section 508 receives reception quadrature baseband signals 504 and 505, estimates channel B transmission path distortion, and outputs channel B transmission path distortion estimation signal 509.

  Delay unit 510 receives in-phase component 504 and quadrature component 505 of the received quadrature baseband signal, and receives the received quadrature baseband signal delayed for a time required to obtain channel A and channel B transmission path distortion estimation signals 507 and 509. In-phase component 511 and quadrature component 512 are output.

  Radio section 515 receives reception signal 514 received by antenna 513 and outputs in-phase component 516 and quadrature component 517 of the received quadrature baseband signal.

  Channel A transmission path distortion estimation section 518 receives reception quadrature baseband signals 516 and 517, estimates channel A transmission path distortion, and outputs channel A transmission path distortion estimation signal 519.

  Channel B transmission path distortion estimation section 520 receives reception quadrature baseband signals 516 and 517, estimates channel B transmission path distortion, and outputs channel B transmission path distortion estimation signal 521.

  Delay unit 522 receives in-phase component 516 and quadrature component 517 of the received quadrature baseband signal, and receives the received quadrature baseband signal delayed for a time required to obtain channel A and channel B channel distortion estimation signals 519 and 521. The in-phase component 523 and the quadrature component 524 are output.

  The signal processing unit 525 includes a channel A transmission path distortion estimation signal 507, a channel B transmission path distortion estimation signal 509, a delayed received quadrature baseband signal in-phase component 511 and quadrature component 512, and a channel A transmission path distortion estimation signal. 519, channel B transmission path distortion estimation signal 521, delayed received quadrature baseband signal in-phase component 523 and quadrature component 524 are input, channel A received quadrature baseband signal in-phase component 526 and quadrature component 527, channel B The in-phase component 530 and the quadrature component 531 of the received quadrature baseband signal are output.

  Demodulation section 528 receives in-phase component 526 and quadrature component 527 of the received quadrature baseband signal of channel A, demodulates them, and outputs received digital signal 529 of channel A.

  Demodulation section 532 receives in-phase component 530 and quadrature component 531 of the received quadrature baseband signal of channel B, demodulates, and outputs received digital signal 533 of channel B.

  FIG. 6 shows the relationship among symbols at a certain time, channel A channel distortion, channel B channel distortion, and received quadrature baseband signal, 601 and 607 are channel A pilot symbols, and 602 and 608 are channels. A guard symbols A, 603, 604, 605, and 606 are data symbols of channel A. 609 and 615 are channel B guard symbols, 610 and 616 are channel B pilot symbols, and 611, 612, 613, and 614 are channel B data symbols.

  Channel A pilot symbol 601 and channel B guard symbol 609 are symbols at time 0. Similarly, channel A guard symbols 602 and channel B pilot symbols 610, channel A data symbols 603 and channel B data symbols 611, channel A data symbols 604 and channel B data symbols 612, and channel A data symbols. 605 and channel B data symbol 613, channel A data symbol 606 and channel B data symbol 614, channel A pilot symbol 607 and channel B guard symbol 615, channel A guard symbol 608 and channel B pilot symbol 616. Are symbols at time 1, time 2, time 3, time 4, time 5, time 6, and time 7, respectively.

  FIG. 7 shows an example of a frame configuration of channel A and channel B on the time axis in the present embodiment, where 701, 702, 706, and 707 are pilot symbols of channel A, and 703, 704, 708, and 709 are channels A guard symbol, 705 is a channel A data symbol, 710, 711, 715, 716 are channel B guard symbols, 712, 713, 717, 718 are channel B pilot symbols, 714 is a channel B data symbol, It is assumed that channel A data symbol 705 and channel B data symbol 714 are QPSK modulated.

  Channel A pilot symbol 701 and channel B guard symbol 710 are symbols at the same time. Similarly, channel A pilot symbols 702 and B guard symbols 711, channel A guard symbols 703 and channel B pilot symbols 712, channel A guard symbols 704 and channel B pilot symbols 713, and channel A data symbols. 705 and channel B data symbol 714, channel A pilot symbol 706 and channel B guard symbol 715, channel A pilot symbol 707 and channel B guard symbol 716, channel A guard symbol 708 and channel B pilot symbol 717, Channel A guard symbol 709 and channel B pilot symbol 718 are symbols at the same time.

  And operation | movement of a transmitter is demonstrated using FIG.1, FIG.2, FIG.3 and FIG.

  In FIG. 2, the frame configuration signal generation unit 209 outputs the frame configuration information shown in FIG. 1 as the frame configuration signal 210. The modulation signal generation unit 202 for channel A receives the frame configuration signal 210 and the transmission digital signal 201 for channel A, and outputs the modulation signal 203 for channel A according to the frame configuration. Then, channel B modulation signal generation section 212 receives frame configuration signal 210 and channel B transmission digital signal 211, and outputs channel B modulation signal 213 according to the frame configuration.

  The operations of modulated signal generating section 202 and modulated signal generating section 212 at this time will be described using the transmission section of channel A as an example with reference to FIG.

  Data symbol modulation signal generation section 302 receives transmission digital signal 301, that is, transmission digital signal 201 of channel A in FIG. 2 and frame configuration signal 311, that is, frame configuration signal 210 in FIG. 2, and frame configuration signal 311 is a data symbol. If so, QPSK modulation is performed, and the in-phase component 303 and the quadrature component 304 of the transmission quadrature baseband signal of the data symbol are output.

  Pilot symbol modulation signal generation section 305 receives frame configuration signal 311 as input, and outputs in-phase component 306 and quadrature component 307 of the transmission quadrature baseband signal of the pilot symbol when the frame configuration signal indicates that it is a pilot symbol. To do.

  Guard symbol modulation signal generation section 308 receives frame configuration signal 311 as input, and outputs the in-phase component 309 and quadrature component 310 of the transmission quadrature baseband signal of the guard symbol when the frame configuration signal indicates that it is a guard symbol. To do.

  The signal point arrangement of each symbol on the in-phase-orthogonal plane at this time is as shown in FIG. The signal point arrangement of the in-phase component 303 and the quadrature component 304 of the data symbol transmission quadrature baseband signal is as 401 in FIG. The signal point arrangement of the in-phase component 306 and the quadrature component 307 of the transmission quadrature baseband signal of the pilot symbol is as indicated by 402 in FIG. Also, the signal point arrangement of the in-phase component 309 and the quadrature component 310 of the transmission quadrature baseband signal of the guard symbol is as indicated by 403 in FIG.

  In-phase component switching section 312 receives in-phase component 303 of the data symbol transmission quadrature baseband signal, in-phase component 306 of the transmission quadrature baseband signal of pilot symbol, in-phase component 309 of the transmission quadrature baseband signal of guard symbol, and frame configuration signal 311. As an input, the in-phase component of the transmission quadrature baseband signal corresponding to the symbol indicated by the frame configuration signal 311 is selected and output as the in-phase component 313 of the selected transmission quadrature baseband signal.

  The orthogonal component switching unit 314 receives the orthogonal component 304 of the data symbol transmission orthogonal baseband signal, the orthogonal component 307 of the transmission orthogonal baseband signal of the pilot symbol, the orthogonal component 310 of the transmission orthogonal baseband signal of the guard symbol, and the frame configuration signal 311. As an input, the orthogonal component of the transmission orthogonal baseband signal corresponding to the symbol indicated by the frame configuration signal 311 is selected and output as the orthogonal component 315 of the selected transmission orthogonal baseband signal.

  The quadrature modulator 316 receives the in-phase component 313 of the selected transmission quadrature baseband signal and the quadrature component 315 of the selected transmission quadrature baseband signal, performs quadrature modulation, and outputs the modulated signal 317, that is, 203 of FIG. .

  Next, the operation of the receiving apparatus, in particular, channel A transmission path distortion estimation section 506, channel B transmission path distortion estimation section 508, and signal processing section 525 will be described with reference to FIGS.

  6 will be described with reference to the in-phase component 504 and the quadrature component 505 of the received quadrature baseband signal of the received signal received by the antenna 501 in FIG.

  In FIG. 6, at time 0, a pilot symbol 601 for channel A and a guard symbol 609 for channel B are multiplexed, and the in-phase component 504 and the quadrature component 505 of the received quadrature baseband signal at this time are set to I0 and Q0, respectively. . When the channel A transmission path distortion is (Ia0, Qa0) and the channel B transmission path distortion is (Ib0, Qb0), the transmission apparatus transmits zero in the guard symbol of channel B. I 0 and Q 0 of the in-phase component 504 and the quadrature component 505 of the signal are composed of the components of the pilot symbol 601 of channel A. Therefore, the channel A transmission path distortion (Ia0, Qa0) = (I′0, Q′0) can be estimated from I0 and Q0 of the in-phase component 504 and the quadrature component 505 of the received quadrature baseband signal.

  However, the estimation of channel distortion (Ia0, Qa0) of channel A is not limited to the above, and channel distortion (Ia0, Qa0) of channel A at time 0 using the pilot symbols of channel A at other times. ).

  Similarly, at time 1, channel A guard symbol 602 and channel B pilot symbol 610 are multiplexed, and the in-phase component 504 and the quadrature component 505 of the received quadrature baseband signal at this time are I1 and Q1, respectively. If the channel A transmission path distortion is (Ia1, Qa1) and the channel B transmission path distortion is (Ib1, Qb1), the transmission apparatus transmits zero in the guard symbol of channel A. I1 and Q1 of the in-phase component 504 and the quadrature component 505 of the signal are composed of the components of the pilot symbol 610 of channel B. Therefore, the channel B transmission path distortion (Ib1, Qb1) = (I′1, Q′1) can be estimated from I1 and Q1 of the in-phase component 504 and the quadrature component 505 of the received quadrature baseband signal. However, the estimation of the channel B transmission path distortion (Ib1, Qb1) is not limited to the above, but the channel B transmission path distortion (Ib1, Qb1) at time 1 using the pilot symbols of channel B at other times. ).

  Similarly, at time 6, channel A pilot symbol 607 and channel B guard symbol 615 are multiplexed, and the in-phase component 504 and the quadrature component 505 of the received quadrature baseband signal at this time are I 6 and Q 6, respectively. If the channel A transmission path distortion is (Ia6, Qa6) and the channel B transmission path distortion is (Ib6, Qb6), the transmission apparatus transmits zero in the guard symbol of channel B. I6 and Q6 of the in-phase component 504 and the quadrature component 505 of the signal are composed of the components of the pilot symbol 607 of channel A.

  Therefore, the channel A transmission path distortion (Ia6, Qa6) = (I′6, Q′6) can be estimated from I6 and Q6 of the in-phase component 504 and the quadrature component 505 of the received quadrature baseband signal. However, the estimation of channel distortion (Ia6, Qa6) of channel A is not limited to the above, and the channel distortion (Ia6, Qa6) of channel A at time 6 is used by using pilot symbols of channel A at other times. ).

  Similarly, at time 7, channel A guard symbol 608 and channel B pilot symbol 616 are multiplexed, and the in-phase component 504 and quadrature component 505 of the received quadrature baseband signal at this time are I7 and Q7, respectively. If the channel A transmission path distortion is (Ia7, Qa7) and the channel B transmission path distortion is (Ib7, Qb7), the transmission apparatus transmits zero in the guard symbol of channel A. I7 and Q7 of the in-phase component 504 and the quadrature component 505 of the signal are composed of the components of the pilot symbol 610 of channel B.

  Therefore, it is possible to estimate channel B transmission path distortion (Ib7, Qb7) = (I′7, Q′7) from I7 and Q7 of the in-phase component 504 and the quadrature component 505 of the received quadrature baseband signal. However, the estimation of the channel B transmission path distortion (Ib7, Qb7) is not limited to the above, and the channel B transmission path distortion (Ib7, Qb7) at time 7 using the channel B pilot symbols at other times. ).

  Channel A transmission path distortions at times 2, 3, 4, and 5 are (Ia2, Qa2), (Ia3, Qa3), (Ia4, Qa4), and (Ia5, Qa5), respectively. These are, for example, the channel distortion (Ia0, Qa0) = (I′0, Q′0) of channel A at time 0 and the channel distortion (Ia6, Qa6) = (I ′) of channel A at time 6 6, Q′6), for example, by interpolation. However, in order to find (Ia2, Qa2), (Ia3, Qa3), (Ia4, Qa4), (Ia5, Qa5), in addition to (Ia0, Qa0), (Ia6, Qa6), channel A at other times The pilot symbols may be used.

  Similarly, the channel B transmission path distortions at times 2, 3, 4, and 5 are (Ib2, Qb2), (Ib3, Qb3), (Ib4, Qb4), and (Ib5, Qb5), respectively. These are, for example, channel B transmission path distortion (Ib1, Qb1) = (I′1, Q′1) at time 1 and channel B transmission path distortion (Ib7, Qb7) = (I ′) at time 7. 7, Q′7), for example, by interpolation. However, in order to determine (Ib2, Qb2), (Ib3, Qb3), (Ib4, Qb4), (Ib5, Qb5), in addition to (Ib1, Qb1), (Ib7, Qb7), channel B at other times The pilot symbols may be used.

  Thereby, the channel A transmission path distortion estimation unit 506, for example, (Ia0, Qa0), (Ia1, Qa1), (Ia2, Qa2), (Ia3, Qa3), (Ia4, Qa4), (Ia5, Qa5), (Ia6, Qa6), and (Ia7, Qa7) are output as channel A transmission path distortion estimation signals 507.

  Similarly, the channel B transmission path distortion estimation unit 508, for example, (Ib0, Qb0), (Ib1, Qb1), (Ib2, Qb2), (Ib3, Qb3), (Ib4, Qb4), (Ib5, Qb5), (Ib6, Qb6), and (Ib7, Qb7) are output as channel A transmission path distortion estimation signals 507.

  In the above description, the transmission path distortion is expressed by the expression (I, Q). However, the expression by the power and the phase may be used. The expression by the power and the phase is expressed by the transmission path distortion estimation signal 507 of the channel A and the channel B. The transmission path distortion estimation signal 509 may be used.

  Similarly to the above, the channel A transmission path distortion estimation signal 519 is obtained from the in-phase component 516 and the quadrature component 517 of the reception quadrature baseband signal of the reception signal received by the antenna 513 in FIG. The channel B transmission path distortion estimation unit 520 outputs the channel B transmission path distortion estimation signal 520.

  The signal processing unit 525 includes a channel A transmission path distortion estimation signal 507, a channel B transmission path distortion estimation signal 509, a channel A transmission path distortion estimation signal 519, a channel B transmission path distortion estimation signal 521, and a delayed reception. A channel which is an unknown signal by inputting the in-phase component 511 and the quadrature component 512 of the quadrature baseband signal and the in-phase component 530 and the quadrature component 531 of the delayed received quadrature baseband signal and performing matrix operation from these known signals. A received quadrature baseband signal of channel A and received quadrature baseband signal of channel B can be obtained, and these are obtained as in-phase component 526 and quadrature component 527 of received quadrature baseband signal of channel A, and received quadrature baseband signal of channel B. The in-phase component 530 and the quadrature component 531 are output. Thereby, the modulation signals of channel A and channel B can be separated and demodulated.

  In the present embodiment, the accuracy of separation of modulated signals of channel A and channel B in the receiving apparatus depends on the reception quality of pilot symbols. Therefore, if the resistance to noise of the pilot symbol is increased, the accuracy of separation of the modulated signals of channel A and channel B is improved, and the quality of received data is improved. The means will be described below.

  In FIG. 4, the amplitude from the origin of the pilot symbol is Ap, and the maximum signal point amplitude from the origin of QPSK is Aq. At this time, by setting Ap> Aq, the anti-noise resistance of the pilot symbol is improved, the accuracy of separation of the modulated signals of channel A and channel B is improved, and the quality of received data is improved.

  Further, as shown in FIG. 7, the channel A pilot symbols 701, 702 and 706, 707 in the channel A frame configuration, and 712, 713 and 717, 718 in the channel B frame configuration are continuous on the time axis. By arranging the pilot symbols, the anti-noise resistance of the pilot symbols is improved, the accuracy of separation of the modulated signals of channel A and channel B is improved, and the quality of received data is improved. However, the present invention is not limited to two consecutive symbols as shown in FIG.

  However, in this embodiment, the number of multiplexed channels has been described as two, but this is not a limitation. Further, the frame configuration is not limited to that shown in FIGS. The pilot symbol has been described as an example. However, the symbol for separating the channel is not limited to the pilot symbol, and can be similarly implemented if it is a symbol for demodulation. At this time, the symbol for demodulation means, for example, a pilot symbol, a unique word, a synchronization symbol, a preamble symbol, a control symbol, a tail symbol, a control symbol, a known PSK modulation symbol, and a PSK modulation symbol to which data is added. Yes.

  The data symbol modulation method is not limited to QPSK modulation, and the modulation method of each channel may be different. All channels may use a spread spectrum communication system. A spread spectrum communication method and a method that does not use the spread spectrum communication method may be mixed.

  Further, the configuration of the transmission apparatus in the present embodiment is not limited to that shown in FIGS. 2 and 3, and when the number of channels increases, the portion configured by 201 to 208 in FIG. 2 increases accordingly. Become.

  In addition, the configuration of the receiving apparatus in this embodiment is not limited to that in FIG. 5, and the number of channel estimation units increases when the number of channels increases.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  In the present embodiment, the transmission path distortion estimation unit of each channel estimates the transmission path distortion, but the same effect can be obtained by estimating transmission path fluctuations instead. In this case, a transmission path fluctuation estimation unit that estimates transmission path fluctuation is used instead of the transmission path distortion estimation section that estimates transmission path distortion. The output signal in this case is a transmission path fluctuation estimation signal.

  As described above, according to the present embodiment, in a transmission method for multiplexing modulation signals of a plurality of channels in the same frequency band, symbols of other channels at the time when a symbol for demodulation is inserted into a channel are in-phase. -A transmission method in which in-phase and quadrature signals in a quadrature plane are zero signals, and a transmission device and a reception device in the transmission method, so that the modulation signals of multiple channels are multiplexed on the same frequency, so that the data transmission rate At the same time, the received multiplexed modulation signal can be easily separated in the receiver.

(Embodiment 2)
The second embodiment includes a field strength estimation unit that estimates a received field strength of a received signal received by each antenna and outputs a received field strength estimated signal of each received signal, and transmission path distortion of a channel with each antenna. An estimation signal is input, a phase difference estimation unit for obtaining a phase difference of a channel distortion estimation signal of a channel with each antenna and outputting a phase difference signal is provided, and a reception quadrature baseband signal of each antenna, The channel distortion estimation signal of each channel, the received electric field strength estimation signal of the received signal, and the phase difference signal are input, and a received quadrature baseband signal for separating the signal of each channel from the received signal, A receiving apparatus including a signal selection unit that selects and outputs a transmission path distortion estimation signal will be described. However, the description in this embodiment will be made by taking as an example the case where the modulation signal having the frame configuration in FIG. 1 described in Embodiment 1 is transmitted by the transmission apparatus in FIG.

  FIG. 8 shows an example of the configuration of the receiving apparatus in this embodiment. Radio section 803 receives reception signal 802 received by antenna 801 as input, in-phase component 804 and quadrature component 805 of the received quadrature baseband signal. Is output.

  Channel A transmission path distortion estimator 806 receives in-phase component 804 and quadrature component 805 of the received quadrature baseband signal, for example, description of channel A transmission path distortion estimator 506 in FIG. The same operation is performed, and a channel A transmission path distortion estimation signal 807 is output.

  Channel B transmission path distortion estimator 808 receives in-phase component 804 and quadrature component 805 of the received quadrature baseband signal, for example, description of channel A transmission path distortion estimator 506 in FIG. The same operation is performed, and a channel B transmission path distortion estimation signal 809 is output.

  The delay unit 810 receives the in-phase component 804 and the quadrature component 805 of the received quadrature baseband signal, and delays the time required to obtain the channel A transmission path distortion estimation signal 807 and the channel B transmission path distortion estimation signal 809. The in-phase component 811 and the quadrature component 812 of the delayed received quadrature baseband signal are output.

  Radio section 815 receives reception signal 814 received by antenna 813 and outputs in-phase component 816 and quadrature component 817 of the received quadrature baseband signal.

  Channel A transmission path distortion estimator 818 receives in-phase component 816 and quadrature component 817 of the received quadrature baseband signal as input, for example, description of channel A transmission path distortion estimator 506 in FIG. The same operation is performed, and a channel A transmission path distortion estimation signal 819 is output.

  Channel B transmission path distortion estimator 820 receives in-phase component 816 and quadrature component 817 of the received quadrature baseband signal, for example, description of channel A transmission path distortion estimator 506 in FIG. The same operation is performed, and a channel B transmission path distortion estimation signal 821 is output.

  The delay unit 822 receives the in-phase component 816 and the quadrature component 817 of the received quadrature baseband signal, and delays the time required to obtain the channel A transmission path distortion estimation signal 819 and the channel B transmission path distortion estimation signal 821. The in-phase component 823 and the quadrature component 824 of the delayed received quadrature baseband signal are output.

  Radio section 827 receives reception signal 826 received by antenna 825, and outputs in-phase component 828 and quadrature component 829 of the received quadrature baseband signal.

  Channel A transmission path distortion estimator 830 receives in-phase component 828 and quadrature component 829 of the received quadrature baseband signal, for example, description of channel A transmission path distortion estimator 506 in FIG. The same operation is performed, and a channel A transmission path distortion estimation signal 831 is output.

  Channel B transmission path distortion estimator 832 receives in-phase component 828 and quadrature component 829 of the received quadrature baseband signal, for example, description of channel A transmission path distortion estimator 506 in FIG. The same operation is performed, and a channel B transmission path distortion estimation signal 833 is output.

  The delay unit 834 receives the in-phase component 828 and the quadrature component 829 of the received quadrature baseband signal, and delays the time required to obtain the channel A transmission path distortion estimation signal 831 and the channel B transmission path distortion estimation signal 833. In-phase component 835 and quadrature component 836 of the delayed received quadrature baseband signal are output.

  Radio section 839 receives reception signal 838 received by antenna 837 and outputs in-phase component 840 and quadrature component 841 of the received quadrature baseband signal.

  Channel A transmission path distortion estimator 842 receives in-phase component 840 and quadrature component 841 of the received quadrature baseband signal, for example, description of channel A transmission path distortion estimator 506 in FIG. The same operation is performed, and a channel A transmission path distortion estimation signal 843 is output.

  Channel B transmission path distortion estimator 844 receives in-phase component 840 and quadrature component 841 of the received quadrature baseband signal as input, for example, description of channel A transmission path distortion estimator 506 in FIG. The same operation is performed, and a channel B transmission path distortion estimation signal 845 is output.

  The delay unit 846 receives the in-phase component 840 and the quadrature component 841 of the received quadrature baseband signal, and delays the time required to obtain the channel A transmission path distortion estimation signal 843 and the channel B transmission path distortion estimation signal 845. The in-phase component 847 and the quadrature component 848 of the delayed received quadrature baseband signal are output.

  The field strength estimation unit 849 receives the reception signal 802, the reception signal 814, and the reception signal 826 reception signal 838, receives the reception field strength of the reception signal 802, the reception field strength of the reception signal 814, the field strength of the reception signal 826, and the reception signal. The field strength of 838 is estimated, and the estimated value is output as a received field strength estimation signal 850.

  The phase difference estimation unit 851 receives the channel A transmission path distortion estimation signal 807, the channel A transmission path distortion estimation signal 819, the channel A transmission path distortion estimation signal 831, and the channel A transmission path distortion estimation signal 843 as inputs. For example, the phase difference between the channel A transmission path distortion estimation signal 807 and the channel A transmission path distortion estimation signal 819 in the in-phase-orthogonal plane is obtained and output as a phase difference estimation signal 852 of channel A. .

  Similarly, phase difference estimator 853 receives channel B transmission path distortion estimation signal 809, channel B transmission path distortion estimation signal 821, channel B transmission path distortion estimation signal 833, and channel B transmission path distortion estimation signal 845. The phase difference between the channel B transmission path distortion estimation signal 809 and the channel B transmission path distortion estimation signal 821 in the in-phase-orthogonal plane is taken as an example, and the phase difference estimation signal 854 of the channel B is obtained. Output.

  The signal selection unit 855 includes a channel A transmission path distortion estimation signal 807, a channel B transmission path distortion estimation signal 809, an in-phase component 811 and a quadrature component 812 of the delayed received quadrature baseband signal, and a channel A transmission path distortion estimation signal. 819, channel B channel distortion estimation signal 821, delayed received quadrature baseband signal in-phase component 823 and quadrature component 824, channel A channel distortion estimation signal 831, channel B channel distortion estimation signal 833, delayed In-phase component 835 and quadrature component 836 of the received quadrature baseband signal, channel A channel distortion estimation signal 843, channel B channel distortion estimation signal 845, delayed received quadrature baseband signal in-phase component 847 and quadrature component 848, Electric field strength estimation signal 850, channel A phase difference estimation signal 852, Phase B estimated phase difference signal 854 as input, and electric field strength estimated signal 850, channel A phase difference estimated signal 852, and channel B phase difference estimated signal 854 are input, and channel A and channel B signals are most accurately obtained. A signal group from the antenna for separation is selected, and signal groups 856 and 857 are output.

  Here, the signal group includes, for example, a channel A transmission path distortion estimation signal 807, a channel B transmission path distortion estimation signal 809, a delayed received quadrature baseband signal in-phase component 811 and a quadrature signal, which are received by the antenna 801. The component 812 is meant.

  Signal processing section 858 receives signal groups 856 and 857 as input, operates in the same manner as signal processing section 525 in FIG. 5 in Embodiment 1, and performs in-phase component 859 and quadrature component 860 of the received quadrature baseband signal of channel A. The in-phase component 861 and the quadrature component 862 of the received quadrature baseband signal of channel B are output.

  Demodulation section 863 receives in-phase component 859 and quadrature component 860 of the received quadrature baseband signal of channel A and outputs received digital signal 864 of channel A.

  Demodulation section 865 receives in-phase component 861 and quadrature component 862 of the channel B received quadrature baseband signal and outputs channel B received digital signal 866.

  FIG. 9 shows an example of the configuration of the receiving apparatus according to the present embodiment, and the same reference numerals are given to parts that operate in the same manner as in FIG.

  The field strength estimation unit 901 includes an in-phase component 804 and a quadrature component 805 of the received quadrature baseband signal, an in-phase component 816 and a quadrature component 817 of the received quadrature baseband signal, an in-phase component 828 and a quadrature component 829 of the received quadrature baseband signal, With the in-phase component 840 and the quadrature component 841 of the quadrature baseband signal as inputs, the received electric field strengths of the in-phase component 804 and the quadrature component 805 of the received quadrature baseband signal, the in-phase component 816 and the quadrature component 817 of the received quadrature baseband signal The received signal strength of the in-phase component 828 and the quadrature component 829 of the received quadrature baseband signal and the received field strength of the in-phase component 840 and the quadrature component 841 of the received quadrature baseband signal are estimated and output as the received electric field strength estimation signal 850 .

  FIG. 10 shows a channel distortion estimation signal of a certain channel according to the present embodiment. Reference numeral 1001 denotes a channel distortion estimation signal of a channel of a reception signal received by the antenna 801, which is represented by (I801, Q801). Shall.

  Reference numeral 1002 denotes a channel distortion estimation signal of a channel having a received signal received by the antenna 813, and is represented by (I813, Q813).

  Reference numeral 1003 denotes a channel distortion estimation signal of a channel having a reception signal received by the antenna 825, and is represented by (I825, Q825).

  Reference numeral 1004 denotes a channel distortion estimation signal of a channel having a reception signal received by the antenna 837, and is represented by (I837, Q837).

  Next, the operation of the receiving apparatus, in particular, the phase difference estimation units 851 and 853 and the signal selection unit 855 will be described with reference to FIGS.

  In the phase difference estimation unit 851, 1001 in FIG. 10 is shown as the channel A transmission path distortion estimation signal 807, 1002 in FIG. 10 is shown as the channel A transmission path distortion estimation signal 819, and 100 A is shown as the channel A transmission path distortion estimation signal 831. 1003 in FIG. 10 is input as the channel A transmission path distortion estimation signal 843. At this time, the phase difference between (I801, Q801) and (I813, Q813) on the IQ plane, the phase difference between (I801, Q801) and (I825, Q825), and (I801, Q801) and (I837, Q837) A phase difference, a phase difference between (I813, Q813) and (I825, Q825), a phase difference between (I813, Q813) and (I837, Q837), and a phase difference between (I825, Q825) and (I837, Q837) are obtained. It is output as a phase difference estimation signal 852 for channel A.

  Similarly, phase difference estimation section 853 outputs channel B phase difference estimation signal 854.

  Next, the operation of the signal selection unit 855 will be described.

  The phase difference estimation signal 852 of channel A, that is, the phase difference between (I801, Q801) and (I813, Q813), the phase difference between (I801, Q801) and (I825, Q825), (I801, Q801) and (I837, Q837) The phase difference between (I813, Q813) and (I825, Q825), the phase difference between (I813, Q813) and (I837, Q837), and the phase difference between (I825, Q825) and (I837, Q837) Each takes a value from 0 to π. For example, when the phase difference between (I801, Q801) and (I813, Q813) is θ, the absolute value of θ is obtained. Then, absolute values are obtained for other phase differences.

  Similarly, it is determined whether the phase estimation signal 854 of channel B has a correlation.

  The signal selection unit 855 selects two optimum antenna systems to be selected from the input channel A phase difference estimation signal 852 and channel B phase estimation signal 854. An example of the method will be described.

  For example, it is assumed that the phase difference of the channel A of the signals received by the antenna 801 and the antenna 813 is 0 and the phase difference of the channel B is 0. At this time, signals received by the antennas 801 and 813 are not selected as the signal groups 856 and 857. Further, it is assumed that the phase difference of channel A of signals received by antenna 801 and antenna 813 is 0 and the phase difference of channel B is π. At this time, signals received by the antennas 801 and 813 are selected as the signal groups 856 and 857.

  In addition, the received signal strength of the received signal from the antenna 801, the received signal from the antenna 813, the received signal from the received signal 825 from the antenna 825, and the received signal strength of the received signal 838 from the antenna 837 is determined from the electric field strength estimation signal 850. And signals having strong received electric field strength are selected as the signal groups 856 and 857.

  As described above, an optimal signal group is preferentially selected from the phase difference and the received electric field strength intensity, and is output as signal groups 856 and 857. For example, there is a correlation between the phase difference between the channel A transmission path distortion of the antenna 801 and the channel A transmission path distortion of the antenna 813, the channel B transmission path distortion of the antenna 801, and the channel B transmission path distortion of the antenna 813. If the reception field strength of the antenna 801 and the reception field strength of the antenna 813 are strong, the channel A transmission path distortion estimation signal 807, the channel B transmission path distortion estimation signal 809, and the delayed reception orthogonality The in-phase component 811 and the quadrature component 812 of the baseband signal are used as a signal group 856, the channel distortion estimation signal 819 for channel A, the channel distortion estimation signal 821 for channel B, the in-phase component 823 and the quadrature of the delayed received quadrature baseband signal. The component 824 is output as a signal group 857.

  9 is different from FIG. 8 in the configuration of the electric field intensity estimation unit. In FIG. 9, the received electric field strength estimation unit 901 includes an in-phase component 804 and an orthogonal component 805 of the received quadrature baseband signal, an in-phase component 816 and an quadrature component 817 of the received quadrature baseband signal, an in-phase component 828 of the received quadrature baseband signal, and The difference from FIG. 8 is that the received electric field strength is obtained from the quadrature component 829, the in-phase component 840 of the received quadrature baseband signal, and the quadrature component 841.

  In the above description, the transmission signal having the frame configuration of FIG. 1 has been described as an example, but the present invention is not limited to this. In addition, although the number of channels has been described with two channels, the number of channels is not limited to this, and when the number of channels increases, the number of transmission path distortion estimation units increases. Each channel may have a different modulation scheme. All channels may use a spread spectrum communication system. A spread spectrum communication method and a method that does not use the spread spectrum communication method may be mixed.

  Further, when there are four or more antennas in the receiving apparatus, the receiving sensitivity is good.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  As described above, according to the present embodiment, there is provided an electric field strength estimating unit that estimates a received electric field strength of a received signal received by each antenna and outputs a received electric field strength estimated signal of each received signal. A phase difference estimation unit that receives a channel distortion estimation signal of a certain channel as input, obtains a phase difference of the channel distortion estimation signal of the channel of each antenna, and outputs a phase difference signal; A reception quadrature base for separating the signal of each channel from the reception signal by inputting the band signal, the channel distortion estimation signal of each channel in each antenna, the reception field strength estimation signal of the reception signal, and the phase difference signal. By selecting a band signal and a channel distortion estimation signal for each channel and outputting the selected signal, a receiving apparatus including a signal selection unit can accurately separate multiple signals. That.

(Embodiment 3)
In Embodiment 3, a symbol for estimating transmission path distortion is inserted in the frame configuration of a transmission signal transmitted from each antenna, the symbol for estimating transmission path distortion is multiplied by a code, and the transmission at each antenna is performed. A transmission method, a transmission device and a reception device in the transmission method, characterized in that symbols for estimating path distortion are arranged at the same time and the codes in each antenna are orthogonal to each other will be described.

  FIG. 11 shows an example of a frame configuration on the time axis according to the present embodiment. Reference numerals 1101, 1103 and 1105 denote pilot symbols of spread spectrum communication A, which are multiplied by a code. Reference numerals 1102 and 1104 denote data symbols of the spread spectrum communication system A, which are multiplied by a code.

  Reference numerals 1106, 1108, and 1110 represent spread spectrum communication system B pilot symbols, which are multiplied by codes. Reference numerals 1107 and 1109 denote data symbols of the spread spectrum communication system B, which are multiplied by a code.

  A pilot symbol 1101 of spread spectrum communication system A and a pilot symbol 1106 of spread spectrum communication system B are symbols at the same time. The data symbol 1102 of the spread spectrum communication system A and the data symbol 1107 of the spread spectrum communication system B are symbols at the same time. The pilot symbol 1103 of the spread spectrum communication system A and the pilot symbol 1108 of the spread spectrum communication system B are symbols at the same time.

  The data symbol 1104 of the spread spectrum communication method A and the data symbol 1109 of the spread spectrum communication method B are symbols at the same time. The pilot symbol 1105 of the spread spectrum communication system A and the pilot symbol 1110 of the spread spectrum communication system B are symbols at the same time.

  FIG. 12 shows an example of the configuration of the transmission apparatus in this embodiment, and frame configuration signal 1217 outputs the frame configuration of FIG. 11 as frame configuration signal 1218.

  The modulation signal generation unit 1202 of the spread spectrum communication system A receives the transmission digital signal 1201 of the spread spectrum communication system A and the frame configuration signal 1218, and outputs the modulation signal 1203 of the spread spectrum communication system A according to the frame configuration.

  The radio unit 1204 of the spread spectrum communication system A receives the modulated signal 1203 of the spread spectrum communication system A and outputs a transmission signal 1205 of the spread spectrum communication system A.

  The power amplification unit 1206 of the spread spectrum communication system A receives the transmission signal 1205 of the spread spectrum communication system A as input, amplifies it, outputs the amplified transmission signal 1207 of the spread spectrum communication system A, and spreads as a radio wave. A is output from the A antenna 1208.

  The spread spectrum communication system B modulation signal generation unit 1210 receives the spread spectrum communication system B transmission digital signal 1209 and the frame configuration signal 1218 as an input, and outputs the spread spectrum communication system B modulation signal 1211 according to the frame configuration.

  The radio unit 1212 of the spread spectrum communication system B receives the modulated signal 1211 of the spread spectrum communication system B and outputs a transmission signal 1213 of the spread spectrum communication system B.

  The power amplification unit 1214 of the spread spectrum communication system B receives the transmission signal 1213 of the spread spectrum communication system B as input, amplifies it, outputs the amplified transmission signal 1215 of the spread spectrum communication system B, and spreads as a radio wave. It is output from the B antenna 1216.

  FIG. 13 shows an example of the configuration of modulated signal generation sections 1202 and 1210 in FIG. 12 in the present embodiment. Pilot symbol modulation signal generation section 1301 receives pilot symbol code Cpa (t) 1302 as input, and multiplies pilot symbol and pilot symbol code Cpa (t) 1302 to transmit a pilot symbol transmission orthogonal baseband signal. In-phase component 1303 and quadrature component 1304 are output.

  Primary modulation section 1306 receives transmission digital signal 1305 as input, and outputs in-phase component 1307 and quadrature component 1308 of the quadrature baseband signal after the primary modulation of channel 0.

  Spreading section 1309 receives in-phase component 1307 and quadrature component 1308 of the quadrature baseband signal after the primary modulation of channel 0, code C0a (t) 1310 for channel 0, and frame configuration signal 1320, and receives frame configuration signal 1320. Based on the frame configuration information, the in-phase component 1307 and the quadrature component 1308 of the quadrature baseband signal after the primary modulation of channel 0 are multiplied by the code C0a (t) 1310 for channel 0 to obtain the transmission quadrature baseband signal of channel 0 The in-phase component 1311 and the quadrature component 1312 are output.

  Primary modulation section 1313 receives transmission digital signal 1305 as input, and outputs in-phase component 1314 and quadrature component 1315 of the quadrature baseband signal after the primary modulation of channel 1.

  Spreading section 1316 receives in-phase component 1314 and quadrature component 1315 of the quadrature baseband signal after the primary modulation of channel 1, code C1a (t) 1317 for channel 1 and frame configuration signal 1320 as input, Based on the configuration information, the in-phase component 1314 and the quadrature component 1315 of the quadrature baseband signal after the primary modulation of channel 1 are multiplied by the code C1a (t) 1317 for channel 1, and the transmission quadrature baseband signal of channel 1 is multiplied. In-phase component 1318 and quadrature component 1319 are output.

  The adder 1321 receives the in-phase component 1311 of the transmission quadrature baseband signal for channel 0 and the in-phase component 1318 of the transmission quadrature baseband signal for channel 1 as inputs, adds the in-phase component 1322 of the added transmission quadrature baseband signal. Output.

  The adder 1323 receives the quadrature component 1312 of the transmission quadrature baseband signal of channel 0 and the in-phase component 1319 of the transmit quadrature baseband signal of channel 1 as inputs, adds the quadrature component 1324 of the transmission quadrature baseband signal added. Output.

  In-phase component switching section 1325 receives in-phase component 1303 of the transmission quadrature baseband signal of the pilot symbol, in-phase component 1322 of the added transmission quadrature baseband signal, and frame configuration signal 1320 as input, and information on the frame configuration of frame configuration signal 1320 Based on, the in-phase component 1303 of the transmission quadrature baseband signal of the pilot symbol and the in-phase component 1322 of the added transmission quadrature baseband signal are selected, and the in-phase component 1326 of the selected transmission quadrature baseband signal is output.

  The orthogonal component switching unit 1327 receives the orthogonal component 1304 of the transmission orthogonal baseband signal of the pilot symbol, the orthogonal component 1324 of the added transmission orthogonal baseband signal, and the frame configuration signal 1320 as input, and information on the frame configuration of the frame configuration signal 1320 Based on, the orthogonal component 1304 of the transmission orthogonal baseband signal of the pilot symbol and the orthogonal component 1324 of the added transmission orthogonal baseband signal are selected, and the orthogonal component 1328 of the selected transmission orthogonal baseband signal is output.

  Quadrature modulator 1329 receives in-phase component 1326 and quadrature component 1328 of the selected transmission quadrature baseband signal as input, performs quadrature modulation, and outputs modulated signal 1330.

  FIG. 14 shows a relationship between codes to be multiplied with pilot symbols on the time axis in the present embodiment. Reference numeral 1401 denotes a spread code of the spread spectrum communication system A at time 0, and is represented by Cpa (0). Reference numeral 1402 denotes a spread code of the spread spectrum communication method A at time 1 and is represented by Cpa (1). Reference numeral 1403 denotes a spread code of the spread spectrum communication system A at time 2, and is represented by Cpa (2). Reference numeral 1404 denotes a spread code of the spread spectrum communication system A at time 3, and is represented by Cpa (3).

  Reference numeral 1405 denotes a spread code of the spread spectrum communication system A at time 4, and is represented by Cpa (4). Reference numeral 1406 denotes a spread code of the spread spectrum communication system A at time 5, and is represented by Cpa (5). Reference numeral 1407 denotes a spread code of the spread spectrum communication system A at time 6 and is represented by Cpa (6). Reference numeral 1408 denotes a spread code of the spread spectrum communication system A at time 7, and is represented by Cpa (7). The spreading code Cpa forms one cycle from time 0 to time 7.

  Reference numeral 1409 denotes a spread code of the spread spectrum communication system B at time 0, and is represented by Cpb (0). Reference numeral 1410 denotes a spread code of the spread spectrum communication system B at time 1 and is represented by Cpb (1). Reference numeral 1411 denotes a spread code of the spread spectrum communication system B at time 2, and is represented by Cpb (2). Reference numeral 1412 denotes a spread code of the spread spectrum communication system B at time 3, and is represented by Cpb (3). Reference numeral 1413 denotes a spread code of the spread spectrum communication system B at time 4 and is represented by Cpb (4).

  Reference numeral 1414 denotes a spread code of the spread spectrum communication system B at time 5, and is represented by Cpb (5). Reference numeral 1415 denotes a spread code of the spread spectrum communication system B at time 6 and is represented by Cpb (6). Reference numeral 1416 denotes a spread code of the spread spectrum communication system B at time 7, and is represented by Cpb (7). The spreading code Cpb constitutes one cycle from time 0 to time 7.

  FIG. 15 illustrates an example of a configuration of the reception device in this embodiment. Parts that operate in the same manner as in FIG.

  A transmission path distortion estimation unit 1501 of the spread spectrum communication system A receives the in-phase component 504 and the quadrature component 505 of the received quadrature baseband signal, estimates the transmission path distortion of the spread spectrum communication system A, and A transmission path distortion estimation signal 1502 is output.

  Spread channel communication method B transmission path distortion estimation section 1503 receives in-phase component 504 and quadrature component 505 of the received quadrature baseband signal, estimates the spread channel communication system B transmission path distortion, and spread spectrum communication system B A transmission path distortion estimation signal 1504 is output.

  A transmission path distortion estimation unit 1505 of the spread spectrum communication system A receives the in-phase component 516 and the quadrature component 517 of the received quadrature baseband signal, estimates the transmission path distortion of the spread spectrum communication system A, and A transmission path distortion estimation signal 1506 is output.

  A transmission path distortion estimation unit 1507 of the spread spectrum communication system B receives the in-phase component 516 and the quadrature component 517 of the received quadrature baseband signal, estimates the transmission path distortion of the spread spectrum communication system B, and A transmission path distortion estimation signal 1508 is output.

  The signal processing unit 1509 includes a spread spectrum communication system A transmission path distortion estimation signal 1502, a spread spectrum communication system B transmission path distortion estimation signal 1504, a delayed received quadrature baseband signal in-phase component 511 and a quadrature component 512, spread spectrum The transmission channel distortion estimation signal 1506 of the communication system A and the transmission channel distortion estimation signal 1508 of the spread spectrum communication system B are input as the in-phase component 523 and the quadrature component 524 of the received quadrature baseband signal, and the reception quadrature of the spread spectrum communication system A is received. An in-phase component 1510 and a quadrature component 1511 of the baseband signal, and an in-phase component 1512 and a quadrature component 1513 of the received quadrature baseband signal of the spread spectrum communication system B are output.

  Spread spectrum communication system A demodulator 1514 receives in-phase component 1510 and quadrature component 1511 of the received quadrature baseband signal of spread spectrum communication system A, and outputs received digital signal group 1515 of spread spectrum communication system A.

  Spread spectrum communication system B demodulator 1516 receives in-phase component 1512 and quadrature component 1513 of the received quadrature baseband signal of spread spectrum communication system B, and outputs received digital signal group 1517 of spread spectrum communication system B.

  FIG. 16 shows an example of the configuration of the spread spectrum method A transmission path distortion estimators 1501 and 1505 and the spread spectrum communication system B transmission path distortion estimators 1503 and 1507 of FIG.

  Pilot symbol despreading section 1603 receives in-phase component 1601 and quadrature component 1602 of the received quadrature baseband signal, and spreading code 1604 as input, and receives in-phase component 1605 and quadrature component 1606 of the received quadrature baseband signal of the despread pilot symbol. Output.

  Transmission path distortion estimation section 1607 receives in-phase component 1605 and quadrature component 1606 of the received quadrature baseband signal of the pilot symbol after despreading, and outputs transmission path distortion estimation signal 1608.

  FIG. 17 shows the amount of channel distortion on the time axis, 1701 shows a pilot symbol at time 0, and channel distortion is (I0, Q0). Reference numeral 1702 denotes a data symbol at time 1, and the transmission path distortion is (I1, Q1). Reference numeral 1703 denotes a data symbol at time 2, and the transmission path distortion is (I2, Q2). Reference numeral 1704 denotes a data symbol at time 3, and the transmission path distortion is (I3, Q3). Reference numeral 1705 denotes a data symbol at time 4, and the transmission path distortion is (I4, Q4). Reference numeral 1706 denotes a data symbol at time 5, and the transmission path distortion is (I5, Q5). Reference numeral 1707 denotes a pilot symbol at time 6, and the transmission path distortion is (I6, Q6).

  The operation of the transmission apparatus will be described with reference to FIGS. 11, 12, 13, and 14.

  Configurations of pilot symbols 1101 for spread spectrum communication scheme A and pilot symbols 1106 for spread spectrum communication scheme B, which are pilot symbols at the same time in FIG. 11, will be described with reference to FIG.

  FIG. 14 shows the configuration of one pilot symbol. The pilot symbol 1101 of the spread spectrum communication system A in FIG. 11 is assumed to be composed of spreading codes 1401, 1402, 1403, 1404, 1405, 1406, 1407, and 1408, for example, multiplied by the code Cpa. Similarly, the pilot symbol 1106 of the spread spectrum communication system B in FIG. 11 is multiplied by the code Cpb, and is composed of spreading codes 1409, 1410, 1411, 1412, 1413, 1414, 1415, 1416, for example. To do. It is assumed that the spread code Cpa multiplied by the spread symbol communication scheme A pilot symbol and the spread code Cpb multiplied by the spread spectrum communication scheme B pilot symbol are orthogonal to each other.

  Next, the operation of the transmission device will be described.

  In FIG. 12, the frame configuration generation unit 1217 outputs the frame configuration information shown in FIG. The modulation signal generation unit 1202 of the spread spectrum communication system A receives the frame configuration signal 1218 and the transmission digital signal 1201 of the spread spectrum communication system A, and outputs the modulation signal 1203 of the spread spectrum communication system A according to the frame configuration. Then, modulated signal generation section 1210 of spread spectrum communication system B receives frame configuration signal 1218 and transmission digital signal 1209 of spread spectrum communication system B as an input, and outputs modulated signal 1211 of spread spectrum communication system B according to the frame configuration. To do.

  The operation of modulation scheme generation sections 1202 and 1210 at this time will be described with reference to FIG.

  In the transmission unit of the spread spectrum communication system A, the pilot symbol modulation signal generation unit 1301 in FIG. 13 receives the code 1302 for pilot symbols and the frame configuration signal 1320 as an input, for example, the pilot symbol in the spread spectrum communication system A in FIG. In-phase component 1303 and quadrature component 1304 of the transmission quadrature baseband signal of the pilot symbol according to the configuration are output.

  Similarly, in the transmission unit of spread spectrum communication system B, pilot symbol modulation signal generation section 1301 in FIG. 13 receives as input code 1302 for pilot symbols and frame configuration signal 1320. For example, the spread spectrum communication system in FIG. In-phase component 1303 and quadrature component 1304 of the transmission quadrature baseband signal of the pilot symbol according to the B pilot symbol configuration are output.

  In this way, the spread symbols of the spread spectrum communication system A and the spread symbols of the spread spectrum communication system B are orthogonalized.

  Next, the operation of the receiving apparatus will be described with reference to FIG. 15, FIG. 16, and FIG.

  The antenna 501 in FIG. 15 receives a received signal 502 in which the spread spectrum communication method A and the spread spectrum communication method B are mixed, and the radio unit 503 receives a received orthogonal baseband signal in which the spread spectrum communication method A and the spread spectrum communication method B are mixed. In-phase component 504 and quadrature component 505 are output.

  The operations of the transmission path distortion estimation unit 1501 of the spread spectrum communication system A and the transmission path distortion estimation unit 1503 of the spread spectrum communication system B will be described with reference to FIG.

  The transmission path distortion estimation unit 1501 of the spread spectrum communication system A will be described. The pilot symbol despreading section 1603 in FIG. 16 is for the in-phase component 1601 and quadrature component 1602 of the received quadrature baseband signal in which the spread spectrum communication method A and the spread spectrum communication method B are mixed, and for the pilot symbols of the spread spectrum communication method A. Using the spread code 1604 as an input, the pilot symbols in the in-phase component 1601 and the quadrature component 1602 of the received quadrature baseband signal in which the spread spectrum communication method A and the spread spectrum communication method B are mixed are detected, and the spread spectrum communication method A and the spread spectrum communication are detected. The pilot symbol portions of the in-phase component 1601 and the quadrature component 1602 of the received quadrature baseband signal mixed with the scheme B are despread with the spreading code 1604 for the pilot symbols of the spread spectrum communication scheme A, and despread And it outputs an in-phase component 1605 and quadrature component 1606 of the reception quadrature baseband signal of the pilot symbols.

  At this time, the spread spectrum communication system B component of the pilot portion in the in-phase component 1601 and the quadrature component 1602 of the received quadrature baseband signal is orthogonal to the code of the spread spectrum communication system A and the code of the spread spectrum communication system B. It can be removed by despreading.

  The transmission path distortion estimation unit 1607 will be described with reference to FIG. The pilot symbol transmission path distortions (I0, Q0) and (I6, Q6) in FIG. 17 are obtained from the in-phase component 1605 and quadrature component 1606 of the received quadrature baseband signal of the despread pilot symbol that is input. . Then, transmission path distortions (I1, Q1), (I2, Q2), (I3, Q3), (I4, Q4) of data symbols from the transmission path distortions (I0, Q0) and (I6, Q6) of the pilot symbols, (I5, Q5) are obtained, and these are output as a transmission path distortion estimation signal 1608.

  Similarly, the transmission path distortion estimation unit 1503 of the spread spectrum communication system B outputs a transmission path distortion estimation signal 1504 of the spread spectrum communication system B in the received signal 502 in which the spread spectrum communication system A and the spread spectrum communication system B are mixed. . Then, the transmission path distortion estimation unit 1505 of the spread spectrum communication system A and the transmission path distortion estimation unit 1507 of the spread spectrum communication system B respectively receive the spectrum from the received signal 514 in which the spread spectrum communication system A and the spread spectrum communication system B are mixed. A transmission path distortion estimation signal 1506 of spread communication system A and a transmission path distortion estimation signal 1508 of spread spectrum communication system B are output.

  In the above description, the transmission path distortion is expressed by the expression (I, Q). However, the expression by the power and the phase may be used, and the expression by the power and the phase may be expressed by the transmission path distortion estimation signal 1502 of the spread spectrum communication system A. 1506 and transmission path distortion estimation signals 1506 and 1508 of spread spectrum communication system B may be used.

  As a result, it is possible to separate the modulation signals of the spread spectrum communication system A and the spread spectrum communication system B and to perform demodulation.

  In the present embodiment, the accuracy of separation of modulated signals of spread spectrum communication system A and spread spectrum communication system B in the receiving apparatus depends on the reception quality of pilot symbols. Therefore, if the resistance to noise of the pilot symbol is increased, the accuracy of separation of the modulation signals of the spread spectrum communication method A and the spread spectrum communication method B is improved, and the quality of received data is improved. Therefore, by making the transmission power power of only the pilot symbols larger than the transmission power power of the data symbols, the anti-noise resistance of the pilot symbols is improved, and the accuracy of separating the modulation signals of the spread spectrum communication system A and the spread spectrum communication system B is improved. As a result, the quality of the received data is improved.

  However, in the present embodiment, the number of spread spectrum communication schemes to be multiplexed is described as two, but the present invention is not limited to this. Further, the frame configuration is not limited to those shown in FIGS. If a pilot symbol is described as an example and transmission path distortion can be estimated, the implementation can be similarly performed. Moreover, although the spread number is set to two channels in both the spread spectrum communication systems A and B, it is not limited to this.

  The configuration of the transmission apparatus according to the present embodiment is not limited to that shown in FIGS. 12 and 13, and when the number of spread spectrum communication methods increases, the number of parts configured from 1201 to 1208 in FIG. 12 increases accordingly. become. Further, when the number of channels increases, the portion constituted by 1306 and 1309 in FIG. 13 increases accordingly.

  The configuration of the receiving apparatus in the present embodiment is not limited to that shown in FIG. 15, and when the number of spread spectrum communication systems increases, the number of transmission path distortion estimation units in the spread spectrum communication system increases.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  As described above, according to the present embodiment, a symbol for estimating transmission path distortion is inserted in the frame configuration of a transmission signal transmitted from each antenna, and the symbol for estimating transmission path distortion is multiplied by a code. The transmission method is characterized in that the symbols for estimating the channel distortion in each antenna are arranged at the same time, and the codes in each antenna are orthogonal to each other. Thus, by multiplexing the modulation signals of a plurality of channels on the same frequency, the data transmission speed is improved, and at the same time, the received multiplexed modulation signal can be easily separated.

(Embodiment 4)
In the fourth embodiment, a signal obtained by transmitting a modulated signal of a spread spectrum communication method from each transmitting antenna to the same frequency band is received, the received electric field strength of the received signal received by each antenna is estimated, and the received electric field of each received signal is received. An electric field strength estimation unit that outputs an intensity estimation signal, receives a transmission path distortion estimation signal of a spread spectrum communication system with each antenna as an input, and a phase difference of the transmission path distortion estimation signal of the spread spectrum communication system with each antenna; And a phase difference estimator that outputs a phase difference signal, a reception quadrature baseband signal for each antenna, a transmission path distortion estimation signal for each spread spectrum communication method for each antenna, and a received field strength estimation signal for the received signal The received quadrature baseband signal for separating each spread spectrum communication system signal from the received signal using the phase difference signal as an input. , Select the channel distortion estimation signal of respective spread-spectrum communication system and outputs, described receiving apparatus comprising signal selection unit.

  However, the description in this embodiment will be described by taking as an example the case where the modulation signal having the frame configuration in FIG. 11 described in Embodiment 3 is transmitted by the transmission apparatus in FIG.

  FIG. 18 illustrates an example of a configuration of the reception device in this embodiment. Portions that operate in the same manner as in FIG.

  Spread channel communication method A transmission path distortion estimation section 1801 receives in-phase component 804 and quadrature component 805 of the received quadrature baseband signal, for example, transmission path distortion of spread spectrum communication system A in FIG. The same operation as described in the estimation unit 1501 is performed, and a transmission path distortion estimation signal 1802 of the spread spectrum communication method A is output.

  Spread channel communication method B transmission path distortion estimation section 1803 receives in-phase component 804 and quadrature component 805 of the received quadrature baseband signal as input, for example, transmission path distortion of spread spectrum communication system A in FIG. The same operation as described for the estimation unit 1501 is performed, and a transmission path distortion estimation signal 1804 of the spread spectrum communication system B is output.

  The delay unit 1805 receives the in-phase component 804 and the quadrature component 805 of the received quadrature baseband signal, and obtains the spread spectrum communication method A transmission path distortion estimation signal 1802 and the spread spectrum communication system B transmission path distortion estimation signal 1804. The in-phase component 1806 and the quadrature component 1807 of the delayed received quadrature baseband signal delayed by the time required for the output are output.

  Spread channel communication method A transmission path distortion estimation section 1808 receives in-phase component 804 and quadrature component 805 of the received quadrature baseband signal, for example, transmission path distortion of spread spectrum communication system A in FIG. The same operation as described in the estimation unit 1501 is performed, and a transmission path distortion estimation signal 1809 of the spread spectrum communication method A is output.

  Spread channel communication scheme B transmission path distortion estimator 1810 receives in-phase component 804 and quadrature component 805 of the received quadrature baseband signal, for example, transmission path distortion of spread spectrum communication system A in FIG. The same operation as described for the estimation unit 1501 is performed, and a transmission path distortion estimation signal 1811 of the spread spectrum communication system B is output.

  The delay unit 1812 receives the in-phase component 804 and the quadrature component 805 of the received quadrature baseband signal, and obtains the spread channel communication method A transmission path distortion estimation signal 1809 and the spread spectrum communication system B transmission path distortion estimation signal 1811. Output the in-phase component 1813 and the quadrature component 1814 of the delayed received quadrature baseband signal delayed by the time required for.

  The transmission path distortion estimation unit 1815 of the spread spectrum communication system A receives the in-phase component 804 and the quadrature component 805 of the received quadrature baseband signal, for example, the transmission path distortion of the spread spectrum communication system A in FIG. The same operation as described in the estimation unit 1501 is performed, and a transmission path distortion estimation signal 1816 of the spread spectrum communication method A is output.

  The transmission path distortion estimator 1817 of the spread spectrum communication system B receives the in-phase component 804 and the quadrature component 805 of the received quadrature baseband signal, for example, the transmission path distortion of the spread spectrum communication system A in FIG. The same operation as described for the estimation unit 1501 is performed, and a transmission path distortion estimation signal 1818 of the spread spectrum communication system B is output.

  The delay unit 1819 receives the in-phase component 804 and the quadrature component 805 of the received quadrature baseband signal, and obtains the spread channel communication method A transmission path distortion estimation signal 1816 and the spread spectrum communication system B transmission path distortion estimation signal 1818. Output the in-phase component 1820 and the quadrature component 1821 of the delayed received quadrature baseband signal delayed by the time required for.

  The transmission path distortion estimation unit 1822 of the spread spectrum communication system A receives the in-phase component 804 and the quadrature component 805 of the received quadrature baseband signal, for example, the transmission path distortion of the spread spectrum communication system A in FIG. The same operation as that of the estimation unit 1501 is performed, and a transmission path distortion estimation signal 1823 of the spread spectrum communication method A is output.

  The transmission path distortion estimation unit 1824 of the spread spectrum communication system B receives the in-phase component 804 and the quadrature component 805 of the received quadrature baseband signal, and, for example, the transmission path distortion of the spread spectrum communication system A in FIG. The same operation as described in the estimation unit 1501 is performed, and a spread channel communication method B transmission path distortion estimation signal 1825 is output.

  The delay unit 1826 receives the in-phase component 804 and the quadrature component 805 of the received quadrature baseband signal, and obtains the spread channel communication method A transmission path distortion estimation signal 1823 and the spread spectrum communication system B transmission path distortion estimation signal 1825. The in-phase component 1827 and the quadrature component 1828 of the delayed received quadrature baseband signal delayed by the time required for.

  The phase difference estimation unit 1829 includes a spread channel communication system A transmission path distortion estimation signal 1802, a spread spectrum communication system A transmission path distortion estimation signal 1809, a spread spectrum communication system A transmission path distortion estimation signal 1816, a spread spectrum communication system. A transmission path distortion estimation signal 1823 of A is input, and the phase difference between the transmission path distortion estimation signal 1802 of spread spectrum communication system A and the transmission path distortion estimation signal 1809 of spread spectrum communication system A is taken as an example. Each phase difference is obtained and output as a phase difference estimation signal 1830 of spread spectrum communication system A.

  Similarly, the phase difference estimation unit 1831 includes a spread spectrum communication method B transmission path distortion estimation signal 1804, a spread spectrum communication system B transmission path distortion estimation signal 1811, a channel B transmission path distortion estimation signal 1818, a spread spectrum communication system. B transmission path distortion estimation signal 1825 input, and the phase difference in the in-phase-orthogonal plane of the spread spectrum communication system B transmission path distortion estimation signal 1804 and the spread spectrum communication system B transmission path distortion estimation signal 1811, respectively, Is output as a phase difference estimation signal 1832 of the spread spectrum communication system B.

  The signal selection unit 1833 includes a spread spectrum communication system A transmission path distortion estimation signal 1802, a spread spectrum communication system B transmission path distortion estimation signal 1804, a delayed received quadrature baseband signal in-phase component 1806 and quadrature component 1807, spread spectrum Transmission path distortion estimation signal 1809 of communication system A, transmission path distortion estimation signal 1811 of spread spectrum communication system B, in-phase component 1813 and quadrature component 1814 of the delayed received quadrature baseband signal, transmission path distortion estimation of spread spectrum communication system A Signal 1816, spread spectrum communication method B transmission path distortion estimation signal 1818, delayed received quadrature baseband signal in-phase component 1820 and quadrature component 1821, spread spectrum communication system A transmission path distortion estimation signal 1823, spread spectrum communication system B Channel distortion estimation signal 825, the in-phase component 1827 and the quadrature component 1828 of the delayed received quadrature baseband signal, the electric field strength estimation signal 850, the spread spectrum communication system A phase difference estimation signal 1830, and the spread spectrum communication system B phase difference estimation signal 1832 as inputs. From the input of the electric field strength estimation signal 850, the spread spectrum communication system A phase difference estimation signal 1830, and the spread spectrum communication system B phase difference estimation signal 1832, the signals of the spread spectrum communication system A and the spread spectrum communication system B are obtained with the highest accuracy. A signal group from the antenna for separating is selected, and signal groups 1834 and 1835 are output.

  Here, the signal group includes, for example, a spread spectrum communication system A transmission path distortion estimation signal 1802, a spread spectrum communication system B transmission path distortion estimation signal 1804, a delayed received orthogonal baseband signal, and the received signal received by the antenna 801. In-phase component 1806 and quadrature component 1807.

  The signal processing unit 1836 receives the signal groups 1834 and 1835, operates in the same manner as the signal processing unit 1509 of FIG. 15 in Embodiment 3, and performs the in-phase component 1837 of the received quadrature baseband signal of the spread spectrum communication method A and The quadrature component 1838, the in-phase component 1839 and the quadrature component 1840 of the received quadrature baseband signal of the spread spectrum communication system B are output.

  The demodulation unit 1841 of the spread spectrum communication system A receives the in-phase component 1837 and the quadrature component 1838 of the received quadrature baseband signal of the spread spectrum communication system A, and outputs the received digital signal 1842 of the spread spectrum communication system A.

  The demodulation unit 1843 of the spread spectrum communication system B receives the in-phase component 1839 and the quadrature component 1840 of the received quadrature baseband signal of the spread spectrum communication system B, and outputs the received digital signal 1844 of the spread spectrum communication system B.

  FIG. 19 shows an example of the configuration of the receiving apparatus according to the present embodiment, and the same reference numerals are given to parts that operate in the same manner as in FIGS.

  FIG. 10 shows a transmission path distortion estimation signal of a spread spectrum communication system according to the present embodiment, and 1001 is a transmission path distortion estimation signal of a spread spectrum communication system with a received signal received by the antenna 801. I801, Q801).

  Reference numeral 1002 denotes a spread spectrum communication type transmission path distortion estimation signal with a received signal received by the antenna 813, and is represented by (I813, Q813).

  Reference numeral 1003 denotes a spread spectrum communication type transmission path distortion estimation signal with a received signal received by the antenna 825, and is represented by (I825, Q825).

  Reference numeral 1004 denotes a spread spectrum communication type transmission path distortion estimation signal with a received signal received by the antenna 837, and is represented by (I837, Q837).

  Next, using FIG. 10 and FIG. 18, the operation of the receiving apparatus, particularly the phase difference estimation units 1829 and 1831 will be described.

  In the phase difference estimator 1829, 1001 of FIG. 10 is used as the transmission path distortion estimation signal 1802 of the spread spectrum communication system A, 1002 of FIG. 10 is input as the transmission path distortion estimation signal 1816 of FIG. 10, and 1004 of FIG. 10 is input as the transmission path distortion estimation signal 1823 of the spread spectrum communication system A. At this time, the phase difference between (I801, Q801) and (I813, Q813) on the IQ plane, the phase difference between (I801, Q801) and (I825, Q825), and (I801, Q801) and (I837, Q837) A phase difference, a phase difference between (I813, Q813) and (I825, Q825), a phase difference between (I813, Q813) and (I837, Q837), and a phase difference between (I825, Q825) and (I837, Q837) are obtained. The phase difference estimation signal 852 of the spread spectrum communication system A is output.

  Similarly, the phase difference estimation unit 1831 outputs the phase difference estimation signal 1832 of the spread spectrum communication method B.

  Next, the operation of the signal selection unit 1833 will be described.

  The phase difference estimation signal 1830 of the spread spectrum communication system A, that is, the phase difference between (I801, Q801) and (I813, Q813), the phase difference between (I801, Q801) and (I825, Q825), (I801, Q801) and (I837) , Q837), (I813, Q813) and (I825, Q825) phase difference, (I813, Q813) and (I837, Q837) phase difference, (I825, Q825) and (I837, Q837) As the phase difference, values from 0 to π are respectively taken. For example, when the phase difference between (I801, Q801) and (I813, Q813) is θ, the absolute value of θ is obtained. Then, absolute values are obtained for other phase differences.

  It is also determined whether there is a correlation in the phase estimation signal 1832 of the spread spectrum communication system B.

  The signal selection unit 1833 selects two optimum antenna systems to be selected from the input spread spectrum communication system A phase difference estimation signal 1830 and spread spectrum communication system B phase estimation signal 1832. An example of the method will be described.

  For example, it is assumed that the phase difference of the spread spectrum communication method A of the signals received by the antenna 801 and the antenna 813 is 0 and the phase difference of the spread spectrum communication method B is 0. At this time, signals received by the antennas 801 and 813 are not selected as the signal groups 856 and 857. Further, it is assumed that the phase difference of channel A of signals received by antenna 801 and antenna 813 is 0 and the phase difference of channel B is π. At this time, signals received by the antennas 801 and 813 are selected as the signal groups 1834 and 1835.

  In addition, the received signal strength of the received signal from the antenna 801, the received signal from the antenna 813, the received signal from the received signal 825 from the antenna 825, and the received signal strength of the received signal 838 from the antenna 837 is determined from the electric field strength estimation signal 850. The signals having strong received electric field strength are selected as the signal groups 1834 and 1835.

  As described above, an optimal signal group is preferentially selected from the phase difference and the received electric field strength intensity, and is output as signal groups 1834 and 1835. For example, the phase difference between the transmission path distortion of the spread spectrum communication system A of the antenna 801 and the transmission path distortion of the spread spectrum communication system A of the antenna 813, the transmission path distortion of the spread spectrum communication system B of the antenna 801, and the spread spectrum communication of the antenna 813. When there is no correlation in the phase difference of transmission path distortion of method B and the reception field strength of antenna 801 and the reception field intensity of antenna 813 are strong, the transmission path distortion estimation signal 1802 of spread spectrum communication system A Spread channel communication system B transmission path distortion estimation signal 1804, delayed in-phase baseband signal in-phase component 1806 and quadrature component 1807 are signal group 1834, spread spectrum communication system A transmission path distortion estimation signal 1809, spread spectrum Communication system B transmission path distortion estimation signal 1811, delayed And it outputs an in-phase component 1813 and quadrature components 1814 Shin quadrature baseband signal as signal groups 1835.

  19 is different from FIG. 18 in the configuration of the electric field strength estimation unit. In FIG. 19, the received electric field strength estimation unit 901 includes an in-phase component 804 and an orthogonal component 805 of the received quadrature baseband signal, an in-phase component 816 and a quadrature component 817 of the received quadrature baseband signal, The difference from FIG. 18 is that the received electric field strength is obtained from the quadrature component 829, the in-phase component 840 of the received quadrature baseband signal, and the quadrature component 841.

  In the above description, the transmission signal having the frame configuration of FIG. 11 has been described as an example, but the present invention is not limited to this. Although the number of spread spectrum communication systems has been described with reference to 2, the number is not limited to this. When the number of spread spectrum communication systems increases, the number of transmission path distortion estimation units increases. Moreover, although the spread number is set to two channels in both the spread spectrum communication systems A and B, it is not limited to this.

  Further, when there are four or more antennas in the receiving apparatus, the receiving sensitivity is good.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  As described above, according to the present embodiment, a signal obtained by transmitting a modulated signal of a spread spectrum communication method to the same frequency band from each transmitting antenna is received, and the received electric field strength of the received signal received by each antenna is estimated. A field strength estimation unit that outputs a reception field strength estimation signal of each received signal is provided, and a transmission path distortion estimation signal of a spread spectrum communication system with each antenna is input, and a transmission path of the spread spectrum communication system with each antenna A phase difference estimator that obtains a phase difference of the distortion estimation signal and outputs a phase difference signal is provided. The reception quadrature baseband signal of each antenna, the transmission path distortion estimation signal of each spread spectrum communication system in each antenna, and the received signal Received signal strength estimation signal, and the phase difference signal as an input, and the signal for each spread spectrum communication method is separated from the received signal. Baseband signal, and select the channel distortion estimation signal of respective spread spectrum communication system, and outputs, by a receiving device including a signal selector can be separated accurately multiplexed signal.

(Embodiment 5)
In Embodiment 5, in a transmission method in which modulated signals of a plurality of channels are transmitted from a plurality of antennas in the same frequency band, a symbol for demodulation inserted into a certain channel is configured by a plurality of consecutive symbols, and each channel is demodulated. The transmission method characterized in that the symbols for is arranged at the same time and orthogonal to each other, and a transmission device and a reception device in the transmission method will be described.

  FIG. 20 shows an example of a frame configuration of channel A and channel B on the time axis in the present embodiment, 2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009 are pilot symbols of channel A, 2005 Are channel A data symbols, 2010, 2011, 2012, 2013, 2015, 2016, 2017, and 2018 are channel B pilot symbols, and 2014 are channel B data symbols.

  FIG. 21 shows an example of signal point arrangement in the in-phase I-orthogonal Q plane of pilot symbols of channel A and channel B, and 2101 and 2102 are pilot symbol signal points.

  FIG. 2 shows an example of the configuration of the transmission apparatus according to this embodiment.

  FIG. 22 shows an example of the detailed configuration of the modulation signal generators 202 and 212 of FIG. 2. The data symbol modulation signal generator 2202 receives the transmission digital signal 2201 and the frame configuration signal 2208 as input, and receives the frame configuration signal. When 2208 indicates that it is a data symbol, for example, QPSK modulation is performed, and an in-phase component 2203 and a quadrature component 2204 of the transmission quadrature baseband signal of the data symbol are output.

  Pilot symbol modulation signal generation section 2205 receives frame configuration signal 2208 as input, and outputs in-phase component 2206 and quadrature component 2207 of the transmission quadrature baseband signal of the pilot symbol when the frame configuration indicates that it is a pilot symbol. .

  In-phase component switching section 2209 receives in-phase component 2203 of the data symbol transmission quadrature baseband signal, in-phase component 2206 of the pilot symbol transmission quadrature baseband signal, and frame configuration signal 2208 as input. The corresponding in-phase component of the transmission quadrature baseband signal is selected and output as the in-phase component 2210 of the selected transmission quadrature baseband signal.

  The orthogonal component switching unit 2211 receives the orthogonal component 2204 of the data symbol transmission orthogonal baseband signal, the orthogonal component 2207 of the transmission orthogonal baseband signal of the pilot symbol, and the frame configuration signal 2208 as input, and converts the symbol indicated by the frame configuration signal 2208 into the symbol. The orthogonal component of the corresponding transmission orthogonal baseband signal is selected and output as the orthogonal component 2212 of the selected transmission orthogonal baseband signal.

  The quadrature modulator 2213 receives the in-phase component 2210 of the selected transmission quadrature baseband signal and the quadrature component 2212 of the selected transmission quadrature baseband signal, performs quadrature modulation, and outputs a modulated signal 2214.

  FIG. 5 shows an example of the configuration of the receiving apparatus in this embodiment.

  FIG. 17 shows the amount of transmission path distortion on the time axis, and 1701 represents the transmission path distortion obtained by the correlation calculation at time 0 as (I0, Q0). Reference numeral 1702 denotes a data symbol at time 1, and the transmission path distortion is (I1, Q1). Reference numeral 1703 denotes a data symbol at time 2, and the transmission path distortion is (I2, Q2). Reference numeral 1704 denotes a data symbol at time 3, and the transmission path distortion is (I3, Q3). Reference numeral 1705 denotes a data symbol at time 4, and the transmission path distortion is (I4, Q4). Reference numeral 1706 denotes a data symbol at time 5, and the transmission path distortion is (I5, Q5). Reference numeral 1707 denotes the transmission path distortion obtained by the correlation calculation at time 6 as (I6, Q6).

  FIG. 23 shows an example of the configuration of channel A transmission path distortion estimators 506 and 518 and channel B transmission path distortion estimators 508 and 520 in FIG. 5 in the present embodiment.

  Pilot symbol correlation calculation section 2303 receives in-phase component 2301 and quadrature component 2302 of the received quadrature baseband signal, and pilot symbol sequence 2304 as input, and in-phase component 2305 and quadrature component 2306 of the received quadrature baseband signal of the pilot symbol after correlation calculation. Is output.

  Transmission path distortion estimation section 2307 receives in-phase component 2305 and quadrature component 2306 of the received quadrature baseband signal of the pilot symbol after correlation calculation as input, and outputs transmission path distortion estimation signal 2308.

  And the transmission method of this Embodiment is demonstrated using FIG. 20, FIG.

  The signal point of pilot symbol 2001 of channel A at time 0 in FIG. 20 is arranged at 2101 (1, 1) in FIG. The signal point of pilot symbol 2002 of channel A at time 1 is arranged at 2101 (1, 1) in FIG. The signal point of pilot symbol 2003 of channel A at time 2 is arranged at 2101 (1, 1) in FIG. The signal point of pilot symbol 2004 of channel A at time 3 is arranged at 2102 (1, 1) in FIG.

  Then, the signal point of pilot symbol 2010 of channel B at time 0 is arranged at 2101 (1, 1) in FIG. The signal point of pilot symbol 2011 of channel B at time 1 is arranged at 2101 (1, 1) in FIG. The signal point of pilot symbol 2012 of channel B at time 2 is arranged at 2102 (-1, -1) in FIG. The signal point of pilot symbol 2013 of channel B at time 3 is arranged at 2102 (-1, -1) in FIG.

  Similarly, 2006 has the same signal point arrangement as 2001, 2007 has 2002, 2008 has 2003, 2004 has 20092015, 2011 has 2011, 2017 has 2012, and 2018 has 2013.

  In this way, the correlation between the continuous pilot symbols 2001, 2002, 2003, and 2004 of channel A and the continuous pilot symbols 2010, 2011, 2012, and 2013 of channel B is set to zero.

  Next, the operation of the transmission apparatus will be described with reference to FIGS.

  In FIG. 2, the frame configuration signal generation unit 209 outputs the frame configuration information shown in FIG. 20 as the frame configuration signal 210. The modulation signal generation unit 202 for channel A receives the frame configuration signal 210 and the transmission digital signal 201 for channel A, and outputs the modulation signal 203 for channel A according to the frame configuration. Then, channel B modulation signal generation section 212 receives frame configuration signal 210 and channel B transmission digital signal 211, and outputs channel B modulation signal 213 according to the frame configuration.

  Operations of modulated signal generating section 202 and modulated signal generating section 212 at this time will be described with reference to FIG.

  Data symbol modulation signal generation section 2202 receives transmission digital signal 2201, that is, transmission digital signal 201 of channel A in FIG. 2 and frame configuration signal 2208, that is, frame configuration signal 210 in FIG. 2, and that frame configuration signal 208 is a data symbol. For example, QPSK modulation is performed, and the in-phase component 2203 and the quadrature component 2204 of the transmission quadrature baseband signal of the data symbol are output.

  Pilot symbol modulation signal generation section 2205 receives frame configuration signal 2208 as input, and outputs the in-phase component 2206 and quadrature component 2207 of the transmission quadrature baseband signal of the pilot symbol when the frame configuration signal indicates that it is a pilot symbol. To do.

  In-phase component switching section 312 receives in-phase component 2203 of the data symbol transmission quadrature baseband signal, in-phase component 2206 of the pilot symbol transmission quadrature baseband signal, and frame configuration signal 2208 as input. The corresponding in-phase component of the transmission quadrature baseband signal is selected and output as the in-phase component 2210 of the selected transmission quadrature baseband signal.

  The orthogonal component switching unit 2211 receives the orthogonal component 2204 of the data symbol transmission orthogonal baseband signal, the orthogonal component 2207 of the transmission orthogonal baseband signal of the pilot symbol, and the frame configuration signal 2208 as input, and converts the symbol indicated by the frame configuration signal 2208 into the symbol. The orthogonal component of the corresponding transmission orthogonal baseband signal is selected and output as the orthogonal component 2212 of the selected transmission orthogonal baseband signal.

  The quadrature modulator 2213 receives the in-phase component 2210 of the selected transmission quadrature baseband signal and the quadrature component 2212 of the selected transmission quadrature baseband signal, performs quadrature modulation, and outputs the modulated signal 2214, that is, 203 of FIG. .

  Next, the operation of the receiving apparatus, in particular, the channel A transmission path distortion estimation unit 506, the channel B transmission path distortion estimation unit 508, and the signal processing unit 525 will be described with reference to FIGS. Here, channel A transmission path distortion estimation section 506 will be described as an example.

  23 receives, as input, in-phase component 2301 and quadrature component 2302 of the received quadrature baseband signal mixed with channel A and channel B received by antenna 501, and pilot symbol sequence 2304 of channel A. Pilot symbols in the in-phase component 2301 and the quadrature component 2302 of the received quadrature baseband signal mixed with A and channel B are detected, and the pilot in the in-phase component 2301 and the quadrature component 2302 of the received quadrature baseband signal mixed with channel A and channel B are detected. The correlation calculation of the symbol part and the pilot symbol sequence 2304 of channel A is performed, and the in-phase component 2305 and the quadrature component 2306 of the received quadrature baseband signal of the pilot symbol after the correlation calculation are output.

  However, the pilot symbol sequence of channel A may be formed of an in-phase component and a quadrature component. At this time, the channel B component of the pilot portion in the in-phase component 2301 and the quadrature component 2302 of the received quadrature baseband signal has a pilot symbol sequence orthogonal to the pilot symbol sequence of channel A and channel B. Can be removed.

  The transmission path distortion estimation unit 2307 will be described with reference to FIG. Transmission path distortions (I0, Q0) and (I6, Q6) in FIG. 17 are obtained by pilot symbol correlation calculation section 2303. Then, transmission path distortions (I1, Q1), (I2, Q2), (I3, Q3), (I4, Q4), (I5, Q5) is obtained, and these are output as a transmission path distortion estimation signal 2308.

  Similarly, channel B transmission path distortion estimation section 508 outputs channel B transmission path distortion estimation signal 509 in received signal 502 in which channel A and channel B are mixed. Then, the channel A transmission path distortion estimation unit 518 and the channel B transmission path distortion estimation unit 520 respectively receive the channel A transmission path distortion estimation signal 519 and the channel B transmission path from the reception signal 514 in which the channel A and the channel B are mixed. A transmission path distortion estimation signal 521 is output.

  In the above description, the transmission path distortion is expressed by the expression (I, Q). However, the expression by the power and the phase may be used, and the expression by the power and the phase is expressed by the transmission path distortion estimation signals 507 and 519 of the channel A, the channel. B transmission path distortion estimation signals 509 and 521 may be used.

  Thereby, the modulation signals of channel A and channel B can be separated and demodulated.

  However, in this embodiment, the number of multiplexed channels has been described as two, but this is not a limitation. Also, the frame configuration is not limited to that shown in FIG. If a pilot symbol is described as an example and transmission path distortion can be estimated, the implementation can be similarly performed.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  The configuration of the transmission apparatus according to the present embodiment is not limited to that shown in FIGS. 2 and 22, and when the number of channels increases, the portion configured by 201 to 208 in FIG. 2 increases accordingly. Further, the configuration of the receiving apparatus is not limited to that shown in FIGS. 5 and 23. When the number of channels increases, the number of transmission path distortion estimation units for the increased channels increases.

  As described above, according to the present embodiment, in a transmission method in which modulated signals of a plurality of channels are transmitted from a plurality of antennas in the same frequency band, symbols for demodulation inserted into a certain channel are configured by a plurality of consecutive symbols. The symbols for demodulating each channel are arranged at the same time and are orthogonal to each other, and a plurality of channels at the same frequency can be obtained by using a transmission apparatus and a reception apparatus in the transmission method. By multiplexing multiple modulation signals, the data transmission speed is improved, and at the same time, the symbols for demodulation are resistant to noise, so the channel estimation accuracy in the receiving device is improved and the data transmission quality is improved. To do.

(Embodiment 6)
In Embodiment 6, in a transmission method in which modulated signals of a plurality of channels are transmitted from a plurality of antennas in the same frequency band, in addition to the time and subcarrier other than the time at which a symbol for demodulation is inserted into a channel in an OFDM frame configuration A transmission method in which in-phase and quadrature signals in the in-phase-orthogonal plane are zero signals, and a transmission device and a reception device in the transmission method will be described.

  FIG. 4 shows signal point arrangement in the in-phase I-orthogonal Q plane.

  FIG. 24 shows an example of the frame configuration of channel A and channel B on the time and frequency axes in the present embodiment, 2401 is a pilot symbol, 2402 is a data symbol, and for example, as shown in FIG. Time 0 of A, subcarrier 2 is a pilot symbol. At this time, channel B is a symbol of (I, Q) = (0, 0). As described above, when channel A is a pilot symbol at a certain time and frequency, channel B is a symbol of (I, Q) = (0, 0). Conversely, when channel B is a pilot symbol, channel A is channel A. Is a symbol of (I, Q) = (0,0).

  FIG. 25 shows an example of the configuration of the transmission apparatus according to this embodiment, and frame configuration signal generation section 2521 outputs frame configuration information as frame configuration signal 2522.

  Channel A serial / parallel converter 2502 receives channel A transmission digital signal 2501 and frame configuration signal 2522 as input, and outputs channel A parallel signal 2503 according to the frame configuration.

  The inverse discrete Fourier transform unit 2504 for channel A receives the parallel signal 2503 for channel A and outputs a signal 2505 after inverse discrete Fourier transform for channel A.

  The radio unit 2506 of channel A receives the signal 2505 after the inverse discrete Fourier transform of channel A as input, and outputs a transmission signal 2507 of channel A.

  The channel A power amplification unit 2508 receives the channel A transmission signal 2507, amplifies it, outputs the amplified channel A transmission signal 2509, and outputs the amplified signal as a radio wave from the channel A antenna 2510.

  The channel B serial / parallel converter 2512 receives the channel B transmission digital signal 2511 and the frame configuration signal 2522 as inputs, and outputs a channel B parallel signal 2513 according to the frame configuration.

  Channel B inverse discrete Fourier transform section 2514 receives channel B parallel signal 2513 as input, and outputs channel B inverse discrete Fourier transform signal 2515.

  The channel B radio section 2516 receives the signal 2515 after the inverse discrete Fourier transform of the channel B and outputs a channel B transmission signal 2517.

  The channel B power amplifying unit 2518 receives the channel B transmission signal 2517 as input, amplifies it, outputs the amplified channel B transmission signal 2519, and outputs it as a radio wave from the channel B antenna 2520.

  FIG. 26 illustrates an example of a configuration of a reception device in this embodiment. Radio section 2603 receives reception signal 2602 received by antenna 2601 and outputs reception quadrature baseband signal 2604.

  The Fourier transform unit 2605 receives the received quadrature baseband signal 2604 and outputs a parallel signal 2606.

  The channel A transmission path distortion estimation unit 2607 receives the parallel signal 2606 and outputs a channel A transmission path distortion parallel signal 2608.

  Channel B transmission path distortion estimation section 2609 receives parallel signal 2606 and outputs channel B transmission path distortion parallel signal 2610.

  Radio section 2613 receives reception signal 2612 received by antenna 2611 and outputs reception quadrature baseband signal 2614.

  The Fourier transform unit 2615 receives the received quadrature baseband signal 2614 and outputs a parallel signal 2616.

  The channel A transmission path distortion estimation unit 2617 receives the parallel signal 2616 and outputs a channel A transmission path distortion parallel signal 2618.

  The channel B transmission path distortion estimation unit 2619 receives the parallel signal 2616 and outputs a channel B transmission path distortion parallel signal 2620.

  The signal processing unit 2621 receives the parallel signals 2606 and 2616, the channel A transmission path distortion parallel signals 2608 and 2618, and the channel B transmission path distortion parallel signals 2610 and 2620, and separates the channel A and channel B signals. A channel A parallel signal 2622 and a channel B parallel signal 2623 are output.

  Channel A demodulator 2624 receives channel A parallel signal 2622 and outputs channel A received digital signal 2625.

  The channel B demodulator 2626 receives the channel B parallel signal 2623 and outputs a channel B received digital signal 2627.

  FIG. 27 shows transmission path distortion on the time axis of a certain carrier. 2701 is a channel A symbol of a carrier at time 0, 2702 is a channel A symbol of a carrier at time 1, 2703 is a channel A symbol of a carrier at time 2, and 2704 is a channel A of a carrier at time 3. 2705 is a channel A symbol of a carrier at time 4, 2706 is a channel A symbol of a carrier at time 5, 2707 is a channel B symbol of a carrier at time 0, and 2708 is a carrier of a carrier at time 1. The channel B symbol, 2709 is the channel B symbol of the carrier at time 2, 2710 is the channel B symbol of the carrier at time 3, 2711 is the channel B symbol of the carrier at time 4, and 2712 is the time 5 It is a channel B symbol of the carrier.

  FIG. 28 illustrates an example of the transmission path distortion of the carrier 1 and the configuration of the signal processing unit. Channel 1 transmission path distortion estimation unit 2803 of carrier 1 receives in-phase component 2801 and quadrature component 2802 of carrier 1 in the parallel signal and outputs transmission path distortion estimation signal 2804 of channel 1 of carrier 1.

  Carrier B channel B channel distortion estimation section 2805 receives carrier 1 in-phase component 2801 and quadrature component 2802 in the parallel signal as input, and outputs carrier 1 channel B channel distortion estimation signal 2806.

  The channel 1 channel distortion estimation unit 2809 of the carrier 1 receives the in-phase component 2807 and the quadrature component 2808 of the carrier 1 in the parallel signal, and outputs the channel distortion estimation signal 2810 of the carrier 1 channel A.

  Carrier B channel B channel distortion estimation section 2811 receives carrier 1 in-phase component 2807 and quadrature component 2808 in the parallel signal as input, and outputs carrier 1 channel B channel distortion estimation signal 2812.

  The carrier 1 signal processing unit 2813 includes an in-phase component 2801 and a quadrature component 2802 of the carrier 1 in the parallel signal, a channel A transmission path distortion estimation signal 2804 of the carrier 1, a carrier B channel B transmission path distortion estimation signal 2806, and a parallel signal. The in-phase component 2807 and quadrature component 2808 of the carrier 1 in the signal, the channel A transmission path distortion estimation signal 2810 of the carrier 1 and the channel B transmission path distortion estimation signal 2812 of the carrier 1 are input, and the signals of the channel A and the channel B are input. Then, the in-phase component 2814 and the quadrature component 2815 of the carrier 1 of the channel A parallel signal and the in-phase component 2816 and the quadrature component 2817 of the carrier 1 of the channel B parallel signal are output.

  And operation | movement of a transmitter is demonstrated using FIG.4, FIG.24, FIG.25.

  In FIG. 24, the signal point of pilot symbol 2401 is the signal point 402 in FIG. The signal point of the data symbol 2402 is the signal point 401 in FIG. The signal point of the symbol (I, Q) = (0, 0) in FIG. 24 is the signal point 403 in FIG.

  In FIG. 2, the frame configuration signal generation unit 2521 outputs the frame configuration information shown in FIG. 24 as the frame configuration signal 2522.

  Channel A serial / parallel converter 2502 receives channel A transmission digital signal 2501 and frame configuration signal 2522 as input, and outputs channel A parallel signal 2503 according to the frame configuration of FIG.

  Similarly, channel B serial / parallel converter 2512 receives channel B transmission digital signal 2511 and frame configuration signal 2522 as input, and outputs channel B parallel signal 2513 according to the frame configuration of FIG.

  Next, using FIG. 26, FIG. 27, and FIG. 28, operations of the receiving apparatus, in particular, channel A transmission path distortion estimators 2607 and 2617, channel B transmission path distortion estimators 2609 and 2619, and signal processor 2621 Here, the carrier 1 in FIG. 24 will be described as an example.

  FIG. 28 shows a configuration in which only the function of carrier 1 is extracted in channel A channel distortion estimation units 2607 and 2617, channel B channel distortion estimation units 2609 and 2619, and signal processing unit 2621 in FIG.

  In FIG. 28, an in-phase component 2801 and a quadrature component 2802 of carrier 1 in the parallel signal are components of carrier 1 of parallel signal 2606 in FIG. The channel A transmission path distortion estimator 2803 of the carrier 1 has the function configuration of the carrier 1 in the channel A transmission path distortion estimator 2607 of FIG. The channel 1 transmission path distortion estimation signal 2804 of the carrier 1 is a component of the carrier 1 of the channel A transmission path distortion parallel signal 2608 of FIG. The channel B transmission path distortion estimator 2805 of the carrier 1 is a functional configuration of the carrier 1 in the channel B transmission path distortion estimator 2609 of FIG. The channel 1 channel distortion estimation signal 2806 of the carrier 1 is the component of the carrier 1 of the channel B channel distortion parallel signal 2610 of FIG.

  In-phase component 2807 and quadrature component 2808 of carrier 1 in the parallel signal are components of carrier 1 of parallel signal 2616 in FIG. The channel 1 transmission path distortion estimator 2809 of the carrier 1 has the function configuration of the carrier 1 in the channel A transmission path distortion estimator 2617 of FIG. The channel A transmission path distortion estimation signal 2810 of the carrier 1 is a component of the carrier 1 of the channel A transmission path distortion parallel signal 2618 of FIG. The channel B transmission path distortion estimator 2811 of carrier 1 is the functional configuration of carrier 1 in the channel B transmission path distortion estimator 2619 of FIG. The channel B transmission path distortion estimation signal 2812 of the carrier 1 is a component of the carrier 1 of the channel B transmission path distortion parallel signal 2620 of FIG.

  The signal processing unit 2813 of the carrier 1 is a functional configuration of the carrier 1 of the signal processing unit 2621. The in-phase component 2814 and the quadrature component 2815 of the carrier 1 of the parallel signal of the channel A are the components of the channel 1 of the parallel signal 2622 of the channel A of FIG. The in-phase component 2816 and the quadrature component 2817 of the carrier 1 of the parallel signal of channel B are the components of channel 1 of the parallel signal 2623 of channel B of FIG.

  Next, the operations of channel A channel distortion estimation units 2803 and 2809 of channel 1 of carrier 1 in FIG. 28 and channel distortion estimation units 2805 and 2811 of carrier B of channel 1 will be described with reference to FIG. The channel A channel distortion estimation unit 2803 of channel A and the channel B channel distortion estimation unit 2805 of carrier 1 will be described as examples.

  In FIG. 27, the received baseband signal of carrier 1 from time 0 to 5, that is, the in-phase component 2807 and quadrature component 2808 of carrier 1 in the parallel signal are respectively (I0, Q0), (I1, Q1), (I2, Q2), (I3, Q3), (I4, Q4), and (I5, Q5).

  The channel A transmission path distortion of carrier 1 from time 0 to 5, that is, channel 1 transmission path distortion estimation signal 2804 of carrier 1 is respectively (Ia0, Qa0), (Ia1, Qa1), (Ia2, Qa2), Let (Ia3, Qa3), (Ia4, Qa4), (Ia5, Qa5).

  Channel B channel distortion of carrier 1 from time 0 to 5, that is, channel B channel distortion estimation signal 2806 of carrier 1 is respectively (Ib0, Qb0), (Ib1, Qb1), (Ib2, Qb2), (Ib3, Qb3), (Ib4, Qb4), (Ib5, Qb5).

  At this time, since (I0, Q0) is only the pilot component of channel B of carrier 1, (Ib0, Qb0) = (I0, Q0). Similarly, since (I1, Q1) is only the pilot component of channel 1 of carrier 1, (Ia1, Qa1) = (I1, Q1). For example, (Ia0, Qa0) = (Ia1, Qa1) = (Ia2, Qa2) = (Ia3, Qa3) = (Ia4, Qa4) = (Ia5, Qa5), (Ib0, Qb0) = (Ib1, Qb1) ) = (Ib2, Qb2) = (Ib3, Qb3) = (Ib4, Qb4) = (Ib5, Qb5), so that the transmission path distortion estimation signal 2804 of channel 1 of carrier 1 and the transmission of channel B of carrier 1 are transmitted. A road distortion estimation signal 2806 is obtained.

  In the same manner, a channel 1 channel distortion estimation signal 2810 of carrier 1 and a channel B channel distortion estimation signal 2812 of carrier 1 are also obtained.

  The carrier 1 signal processing unit 2813 includes carrier 1 channel A transmission path distortion estimation signals 2804 and 2810, carrier 1 channel B transmission path distortion estimation signals 2806 and 2812, in-phase component 2801 of carrier 1 in the parallel signal, and quadrature. By inputting the component 2802 and the in-phase component 2807 and the quadrature component 2808 of the carrier 1 in the parallel signal and performing a matrix operation, the channel A signal and the channel B signal can be separated, and the in-phase of the carrier 1 of the channel A parallel signal The component 2814 and the quadrature component 2815 and the in-phase component 2816 and the quadrature component 2817 of the carrier 1 of the parallel signal of the channel B are output. Thereby, the modulation signals of channel A and channel B can be separated and demodulated.

  In the above description, the transmission path distortion is expressed by the expression (I, Q). However, the expression by the power and the phase may be used, and the expression by the power and the phase may be expressed by the transmission path distortion estimation signal 2804 of the channel A of the carrier 1. 2810 and carrier B channel B transmission path distortion estimation signals 2806 and 2810 may be used.

  In the same manner as described above, it is possible to separate the channel A signal and the channel B signal for the carriers 2, 3, and 4 with the configuration shown in FIG. 28.

  Here, a transmission path estimation method for carrier 2 will be described.

  In the receiving apparatus of the present embodiment, transmission path fluctuation can be estimated from the pilot symbol of time 0 carrier 2 in FIG. Also, from the pilot symbol of carrier 1 at time 1 and the pilot symbol of carrier 3, the channel fluctuation of carrier 2 at time 1 can be estimated. As described above, the channel fluctuation of the carrier 2 is estimated from the estimated value of the channel fluctuation of the carrier 2 estimated at the time 0 and the time 1. Thereby, it is possible to estimate the transmission path fluctuation with high accuracy.

  For example, the transmission path estimation method of carrier 2 in FIG. 24 will be described.

  In the receiving apparatus, the channel fluctuation can be estimated from the pilot symbol of time 0 carrier 2 in FIG. Also, from the pilot symbol of carrier 1 at time 1 and the pilot symbol of carrier 3, the channel fluctuation of carrier 2 at time 1 can be estimated. As described above, the channel fluctuation of the carrier 2 is estimated from the estimated value of the channel fluctuation of the carrier 2 estimated at the time 0 and the time 1. Thereby, it is possible to estimate the transmission path fluctuation with high accuracy.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  In the present embodiment, the accuracy of separation of modulated signals of channel A and channel B in the receiving apparatus depends on the reception quality of pilot symbols. Therefore, if the resistance to noise of the pilot symbol is increased, the accuracy of separation of the modulated signals of channel A and channel B is improved, and the quality of received data is improved. The means will be described below.

  In FIG. 4, the amplitude from the origin of the pilot symbol is Ap, and the maximum signal point amplitude from the origin of QPSK, which is a data symbol modulation method, is Aq. At this time, by setting Ap> Aq, the anti-noise resistance of the pilot symbol is improved, the accuracy of separation of the modulated signals of channel A and channel B is improved, and the quality of received data is improved.

  However, in this embodiment, the number of multiplexed channels has been described as two, but this is not a limitation. Further, the frame configuration is not limited to that shown in FIG. The pilot symbol has been described as an example. However, the symbol for separating the channel is not limited to the pilot symbol, and can be similarly implemented if it is a symbol for demodulation. The data symbol modulation method is not limited to QPSK modulation, and the modulation method of each channel may be different.

  In addition, the configuration of the transmission apparatus according to the present embodiment is not limited to that in FIG. 25. When the number of channels increases, the number of parts configured from 2501 to 2510 in FIG. 25 increases accordingly.

  In addition, the configuration of the receiving apparatus in this embodiment is not limited to that shown in FIGS. 26 and 28. When the number of channels increases, the number of channel estimation units increases.

  As described above, according to the present embodiment, in a transmission method in which modulated signals of a plurality of channels are transmitted from a plurality of antennas in the same frequency band, symbols for demodulation are inserted into channels in an OFDM frame configuration. In the symbols of other channels of time and subcarriers, a transmission method in which the in-phase and quadrature signals in the in-phase-quadrature plane are zero signals, and the transmission apparatus and the reception apparatus in the transmission method have a plurality of channels at the same frequency. By multiplexing these modulation signals, the data transmission speed can be improved, and at the same time, the received multiplexed modulation signal can be easily separated in the receiving apparatus.

(Embodiment 7)
In Embodiment 7, a transmission method for switching between a case where modulated signals of a plurality of channels are transmitted from a plurality of antennas in the same frequency band and a case where a modulated signal of one channel is transmitted from an antenna, a transmission apparatus in the transmission method, and A receiving apparatus will be described.

  FIG. 29 shows an example of a frame configuration in the present embodiment, 2901 and 2903 indicate multiplexed information symbols, 2902 and 2904 indicate channel A frame symbol groups, and 2905 indicate channel B frame symbol groups.

  At this time, the 2901 multiplexed information symbols include information indicating that the channel A and channel B frame symbol groups are transmitted simultaneously, and the 2902 channel A frame symbol group and the 2905 channel B frame symbol group are Sent at the same time.

  The 2903 multiplexed information symbol includes information indicating that only the channel A frame symbol group is transmitted, and only the 2904 channel A frame symbol group is transmitted.

  FIG. 30 illustrates an example of a frame configuration in the present embodiment, where 3001 indicates multiple information symbols and 3002 indicates information symbols.

  At this time, the multiplex information symbol at time 0 includes information indicating that the information symbol of channel A and the information symbol of channel B are transmitted at the same time from time 1 to time 5, and from time 1 to time 5 A information symbol and channel B information symbol are transmitted simultaneously.

  The multiplex information symbol at time 6 includes information indicating that only channel A information is transmitted from time 7 to time 11, and only channel A information is transmitted from time 7 to time 11. Yes.

  FIG. 31 shows the configuration of, for example, a base station transmission apparatus according to the present embodiment. Modulation signal generation section 3102 receives transmission digital signal 3101 and frame configuration signal 3119 as input, and transmits channel A according to the frame configuration. Modulated signal 3103 and channel B modulated signal 3110 are output.

  The channel A radio unit 3105 receives the channel A modulation signal 3103 and outputs a channel A transmission signal 3106.

  The channel A power amplifier 3107 receives the channel A transmission signal 3106, amplifies it, outputs the amplified channel A transmission signal 3108, and outputs the amplified signal from the channel A antenna 3109 as a radio wave.

  The channel B radio section 3111 receives the channel B modulation signal 3110 as an input and outputs a channel B transmission signal 3112.

  The channel B power amplifying unit 3113 receives the channel B transmission signal 3112, amplifies it, outputs the amplified channel B transmission signal 3114, and outputs it from the channel B antenna 3115 as a radio wave.

  The frame configuration signal generation unit 3118 receives the radio wave propagation environment information 3116 and the transmission data amount information 3117 and outputs a frame configuration signal 3119.

  FIG. 32 shows the configuration of, for example, a terminal reception apparatus in this embodiment. Radio section 3203 receives reception signal 3202 received by antenna 3201 and outputs reception quadrature baseband signal 3204.

  Multiplex information symbol demodulator 3205 receives received orthogonal baseband signal 3204 and outputs multiplexed information data 3206.

  Channel A transmission path distortion estimation section 3207 receives reception quadrature baseband signal 3204 and outputs channel A transmission path distortion estimation signal 3208.

  Channel B transmission path distortion estimation section 3209 receives reception quadrature baseband signal 3204 and outputs channel B transmission path distortion estimation signal 3210.

  Radio section 3213 receives reception signal 3212 received by antenna 3211 and outputs reception quadrature baseband signal 3214.

  Channel A transmission path distortion estimation section 3215 receives reception quadrature baseband signal 3214 and outputs channel A transmission path distortion estimation signal 3216.

  Channel B transmission path distortion estimation section 3217 receives reception quadrature baseband signal 3214 and outputs channel B transmission path distortion estimation signal 3218.

  The signal processing unit 3219 receives the channel A transmission path distortion estimation signals 3208 and 3216, the channel B transmission path distortion estimation signals 3210 and 3218, the received orthogonal baseband signals 3204 and 3214, and the multiplexed information data 3206, and receives the multiplexed information data. Based on 3206, a channel A signal 3220 and a channel B signal 3221 are output.

  The demodulator 3222 receives the channel A signal 3220, the channel B signal 3221, and the multiplexed information data 3206, demodulates based on the multiplexed information data 3206, and outputs a received digital signal 3223.

  The radio wave propagation environment estimation unit 3224 receives the reception quadrature baseband signals 3204 and 3214, estimates the radio wave propagation environment, for example, the electric field intensity, and the spatial correlation of the radio wave propagation environment, and outputs the radio wave propagation environment estimation signal 3225. .

  Then, using FIG. 29, FIG. 31, and FIG. 32, for example, a base station transmission apparatus in the present embodiment will be described.

  32, for example, the radio wave propagation environment estimation unit 3224 receives the reception quadrature baseband signals 3204 and 3214 as input, and the spatial correlation of the radio wave propagation environment, for example, the electric field strength and the radio wave propagation environment. And a radio wave propagation environment estimation signal 3225 is output. Information of the radio wave propagation environment estimation signal 3225 is transmitted as data from the transmission device of the terminal, and the base station receives and demodulates the information, and the base station obtains information corresponding to the radio wave propagation environment estimation signal 3225. This information corresponds to the radio wave propagation environment information 3116 in FIG.

  The frame configuration signal generation unit 3118 receives the radio wave propagation environment information 3116 and the transmission data amount information 3117, and, as shown in FIG. 29, for example, 2901 multiplexed information symbols are transmitted simultaneously by channel A and channel B frame symbol groups. That 2902 channel A frame symbol groups and 2905 channel B frame symbol groups are transmitted simultaneously, and 2903 multiple information symbols are channel A This is information indicating that only the frame symbol group is transmitted, and the frame configuration signal 3119 is output indicating that the frame configuration is such that only the 2904 channel A frame symbol group is transmitted. 31 receives transmission digital signal 3101 and frame configuration signal 3119 as input, and outputs channel A modulation signal 3103 and channel B modulation signal 3110 according to the frame configuration.

  Next, for example, a receiving device of a terminal in the present embodiment will be described using FIG. 29 and FIG.

  Multiplex information symbol demodulator 3205 receives reception quadrature baseband signal 3204 and demodulates the multiple information symbol shown in FIG. For example, when the 2901 multiplexed information symbol is demodulated, information indicating that the channel A and channel B frame symbol groups are transmitted simultaneously, and when the 2903 multiplexed symbol is demodulated, only the channel A frame symbol group is transmitted. Information indicating that it is being transmitted is output as multiplexed information data 3206.

  The signal processing unit 3219 receives the channel A transmission path distortion estimation signals 3208 and 3216, the channel B transmission path distortion estimation signals 3210 and 3218, the reception quadrature baseband signals 3204 and 3214, and the multiplexed information data 3206, for example. When the information data 3206 indicates information indicating that the frame symbols of channel A and channel B are transmitted at the same time, the channel A transmission path distortion estimation signals 3208 and 3216, the channel B transmission path distortion estimation signal Inverse matrix operation is performed from 3210 and 3218 and the received quadrature baseband signals 3204 and 3214 to separate channel A and channel B signals, and output channel A signal 3220 and channel B signal 3221. When the multiplex information data 3206 indicates information indicating that only the channel A frame symbol group is transmitted, only the channel A signal 3220 is output.

  The demodulator 3222 receives the channel A signal 3220, the channel B signal 3221, and the multiplexed information data 3206, and the multiplexed information data 3206 indicates that the frame symbol groups of the channel A and the channel B are transmitted simultaneously. When the channel A signal 3220 and the channel B signal 3221 are demodulated, the multiplexed information data 3206 indicates information indicating that only the channel A frame symbol group is transmitted. Only the channel A signal 3220 is demodulated and a received digital signal 3223 is output.

  The same applies to OFDM. For example, a base station transmission apparatus according to the present embodiment will be described with reference to FIGS.

  32, for example, the radio wave propagation environment estimation unit 3224 receives the reception quadrature baseband signals 3204 and 3214 as input, and the spatial correlation of the radio wave propagation environment, for example, the electric field strength and the radio wave propagation environment. And a radio wave propagation environment estimation signal 3225 is output. Information of the radio wave propagation environment estimation signal 3225 is transmitted as data from the transmission device of the terminal, and the base station receives and demodulates the information, and the base station obtains information corresponding to the radio wave propagation environment estimation signal 3225. This information corresponds to the radio wave propagation environment information 3116 in FIG.

  Frame configuration signal generation section 3118 receives radio wave propagation environment information 3116 and transmission data amount information 3117 described above as input, and, for example, as shown in FIG. Information indicating that an information symbol and an information symbol of channel B are transmitted at the same time is a frame configuration in which an information symbol of channel A and an information symbol of channel B are transmitted simultaneously from time 1 to time 5, The multiplex information symbol of time 6 has a frame configuration in which only information on channel A is transmitted from time 7 to time 11 and information indicating that only channel A information is transmitted from time 7 to time 11 Is output as a frame configuration signal 3119. 31 receives transmission digital signal 3101 and frame configuration signal 3119 as input, and outputs channel A modulation signal 3103 and channel B modulation signal 3110 according to the frame configuration.

  Next, for example, a receiving device of a terminal in the present embodiment will be described with reference to FIGS.

  Multiplex information symbol demodulation section 3205 receives reception quadrature baseband signal 3204 as input, and demodulates multiple information symbols shown in FIG. For example, information indicating that channel A and channel B frame symbol groups are simultaneously transmitted when demodulating the time 0 multiplex information symbol, and channel A frame symbol group when demodulating the time 6 multiplex symbol are transmitted. Information indicating that only data is transmitted is output as multiplexed information data 3206.

  The signal processing unit 3219 receives the channel A transmission path distortion estimation signals 3208 and 3216, the channel B transmission path distortion estimation signals 3210 and 3218, the reception quadrature baseband signals 3204 and 3214, and the multiplexed information data 3206, for example. When the information data 3206 indicates information indicating that the frame symbols of channel A and channel B are transmitted at the same time, the channel A transmission path distortion estimation signals 3208 and 3216, the channel B transmission path distortion estimation signal Inverse matrix operation is performed from 3210 and 3218 and the received quadrature baseband signals 3204 and 3214 to separate channel A and channel B signals, and output channel A signal 3220 and channel B signal 3221. When the multiplex information data 3206 indicates information indicating that only the channel A frame symbol group is transmitted, only the channel A signal 3220 is output.

  The demodulator 3222 receives the channel A signal 3220, the channel B signal 3221, and the multiplexed information data 3206, and the multiplexed information data 3206 indicates that the frame symbol groups of the channel A and the channel B are transmitted simultaneously. When the channel A signal 3220 and the channel B signal 3221 are demodulated, the multiplexed information data 3206 indicates information indicating that only the channel A frame symbol group is transmitted. Only the channel A signal 3220 is demodulated and a received digital signal 3223 is output.

  However, in this embodiment, the number of multiplexed channels has been described as two, but this is not a limitation. Further, the frame configuration is not limited to that shown in FIGS.

  In addition, the configuration of the transmission apparatus according to the present embodiment is not limited to that shown in FIG. 31, and when the number of channels increases, the portion configured by 3103 to 3109 in FIG. 31 increases accordingly.

  In addition, the configuration of the receiving apparatus in the present embodiment is not limited to FIG.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  As described above, according to the present embodiment, a transmission method for switching between a case where modulated signals of a plurality of channels are transmitted from a plurality of antennas in the same frequency band and a case where a modulated signal of one channel is transmitted from an antenna, By using the transmission device and the reception device in the transmission method, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the received multiple modulation signals are easily separated at the reception device. can do.

(Embodiment 8)
In the eighth embodiment, a symbol transmission method for synchronization of a transmission method for multiplexing modulated signals of a plurality of channels in the same frequency band, and a transmission device and a reception device in the transmission method will be described.

  FIG. 2 shows an example of the configuration of the transmission apparatus according to this embodiment.

  FIG. 4 shows the signal point arrangement in the in-phase-orthogonal plane in the present embodiment.

  FIG. 33 shows an example of a frame configuration on the time axis in the present embodiment, 3301 and 3305 indicate synchronization symbols, 3302 and 3304 indicate guard symbols, and 3303 and 3306 indicate data symbols.

  FIG. 34 shows an example of a frame configuration on the time axis in the present embodiment, in which 3401 is a synchronization symbol, 3402 and 3404 are data symbols, and 3403 is a guard symbol.

  FIG. 35 shows an example of the configuration of the modulation signal generators 202 and 212 in FIG. 2, and the same reference numerals are given to the parts that operate in the same manner as in FIG. Synchronization symbol modulation signal generation section 3501 receives frame configuration signal 311 as input, and outputs in-phase component 3502 and quadrature component 3503 of the transmission symbol baseband signal of the synchronization symbol when frame configuration signal 311 indicates a synchronization symbol.

  The in-phase component switching unit 312 receives the in-phase component 303 of the data symbol transmission quadrature baseband signal, the in-phase component 3502 of the transmission symbol base quadrature signal of the synchronization symbol, the in-phase component 309 of the transmission quadrature baseband signal of the guard symbol, and the frame configuration signal 311. As an input, the in-phase component of the transmission quadrature baseband signal corresponding to the symbol indicated by the frame configuration signal 311 is selected and output as the in-phase component 313 of the selected transmission quadrature baseband signal.

  The orthogonal component switching unit 314 receives the orthogonal component 304 of the data symbol transmission orthogonal baseband signal, the orthogonal component 3503 of the transmission symbol baseband signal of the synchronization symbol, the orthogonal component 310 of the transmission orthogonal baseband signal of the guard symbol, and the frame configuration signal 311. As an input, the orthogonal component of the transmission orthogonal baseband signal corresponding to the symbol indicated by the frame configuration signal 311 is selected and output as the orthogonal component 315 of the selected transmission orthogonal baseband signal.

  FIG. 36 shows an example of the configuration of the modulation signal generation sections 202 and 212 of FIG. 2, and the guard symbol or synchronization symbol modulation signal generation section 3601 receives the frame configuration signal 311 and transmits guard symbols or synchronization symbols. An in-phase component 3602 and a quadrature component 3603 of the quadrature baseband signal are output.

  FIG. 37 illustrates an example of the configuration of the reception device in this embodiment. Radio section 3703 receives reception signal 3702 received by antenna 3701 and receives reception quadrature baseband signal 3704 as an output.

  Transmission path distortion estimation section 3705 receives reception quadrature baseband signal 3704 and timing signal 3719 as inputs, and outputs transmission path distortion estimation signal 3706.

  Radio section 3708 receives reception signal 3707 received by antenna 3706 and outputs reception quadrature baseband signal 3709.

  Transmission path distortion estimation section 3710 receives reception quadrature baseband signal 3709 and timing signal 3719 and outputs transmission path distortion estimation signal 3711.

  Radio section 3714 receives reception signal 3713 received by antenna 3712 and outputs a reception quadrature baseband signal 3715.

  The transmission path distortion estimation unit 3716 receives the reception quadrature baseband signal 3715 and the timing signal 3719 and outputs a transmission path distortion estimation signal 3717.

  The synchronization unit 3717 receives the reception quadrature baseband signal 3715 as an input, searches for a synchronization symbol transmitted by the transmission device, synchronizes with the transmission device, and outputs a timing signal 3719.

  The signal separation unit 3720 receives the reception quadrature baseband signals 3704, 3709, and 3715, the transmission path distortion estimation signals 3706, 3711, and 3717, and the timing signal 3719, and receives the channel A reception quadrature baseband signal 3721 and the channel B quadrature base. A band signal 3722 is output.

  The demodulator 3723 receives the channel A received quadrature baseband signal 3721 and outputs a received digital signal 3724.

  Demodulation section 3725 receives channel B received quadrature baseband signal 3722 and outputs received digital signal 3725.

  FIG. 38 shows an example of the configuration of the receiving apparatus according to this embodiment, and parts that operate in the same way as in FIG.

  Synchronization section 3801 receives reception quadrature baseband signal 3801 as input, searches for a synchronization symbol transmitted by the transmission apparatus, synchronizes with the transmission apparatus, and outputs timing signal 3802.

  Transmission path distortion estimation section 3705 receives reception quadrature baseband signal 3704 and timing signal 3802 and outputs transmission path distortion estimation signal 3705.

  Synchronizing section 3803 receives reception quadrature baseband signal 3809 as input, searches for a synchronization symbol transmitted by the transmission apparatus, synchronizes with the transmission apparatus, and outputs timing signal 3804.

  Transmission path distortion estimation section 3710 receives reception quadrature baseband signal 3709 and timing signal 3804 and outputs transmission path distortion estimation signal 3711.

  Synchronizing section 3805 receives reception quadrature baseband signal 3815 as input, searches for a synchronization symbol transmitted by the transmission apparatus, synchronizes with the transmission apparatus, and outputs timing signal 3806.

  The transmission path distortion estimation unit 3716 receives the reception quadrature baseband signal 3715 and the timing signal 3806, and outputs a transmission path distortion estimation signal 3717.

  FIG. 39 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same way as in FIG.

  Electric field strength estimation section 3901 receives reception signal 3702, estimates the electric field strength, and outputs electric field strength estimation signal 3902.

  Electric field strength estimation section 3903 receives reception signal 3707 as input, estimates the electric field strength, and outputs electric field strength estimation signal 3904. Electric field strength estimation section 3903 receives reception signal 3707 as input, estimates the electric field strength, and outputs electric field strength estimation signal 3904.

  FIG. 40 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same way as in FIGS. 37 and 39 are given the same reference numerals.

  The signal selection unit 4001 receives the electric field strength estimation signals 3902, 3904, 3906 and the reception quadrature baseband signals 3704, 3709, 3715, and receives, for example, the signal of the antenna receiving the strongest electric field strength among the electric field strength estimation signals. A reception orthogonal orthogonal baseband signal is selected and output as the selected reception orthogonal baseband signal 4002.

  The synchronization unit 4003 receives the selected reception quadrature baseband signal 4002 as an input, searches for a synchronization symbol transmitted by the transmission device, synchronizes with the transmission device, and outputs a timing 4004.

  FIG. 41 shows an example of the configuration of the receiving apparatus according to this embodiment, and parts that operate in the same way as in FIG. 39 are given the same reference numerals.

  FIG. 42 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same way as in FIGS. 39 and 40 are given the same reference numerals.

  The operation of the transmission apparatus will be described with reference to FIGS. 2, 4, 33, 34, 35, and 36.

  In FIG. 2, the frame configuration signal generation unit 209 outputs the frame configuration information shown in FIG. 33 or FIG. 34 as the frame configuration signal 210. The modulation signal generation unit 202 for channel A receives the frame configuration signal 210 and the transmission digital signal 201 for channel A, and outputs the modulation signal 203 for channel A according to the frame configuration. Then, channel B modulation signal generation section 212 receives frame configuration signal 210 and channel B transmission digital signal 211, and outputs channel B modulation signal 213 according to the frame configuration.

  Next, the operation of the modulation signal generators 202 and 212 in the frame configuration shown in FIG. 33 will be described using the channel A transmitter as an example with reference to FIG.

  Data symbol modulation signal generation section 302 receives transmission digital signal 301, that is, transmission digital signal 201 of channel A in FIG. 2 and frame configuration signal 311, that is, frame configuration signal 210 in FIG. 2, and frame configuration signal 311 is a data symbol. If so, the in-phase component 303 and the quadrature component 304 of the transmission quadrature baseband signal of the data symbol are output.

  Synchronization symbol modulation signal generation section 3501 receives frame configuration signal 311 and outputs in-phase component 3502 and quadrature component 3503 of the transmission quadrature baseband signal of the synchronization symbol when the frame configuration signal indicates that it is a synchronization symbol. To do.

  Guard symbol modulation signal generation section 308 receives frame configuration signal 311 as input, and outputs the in-phase component 309 and quadrature component 310 of the transmission quadrature baseband signal of the guard symbol when the frame configuration signal indicates that it is a guard symbol. To do.

  The signal point arrangement of each symbol on the in-phase-orthogonal plane at this time is as shown in FIG. The signal point arrangement of the in-phase component 303 and the quadrature component 304 of the data symbol transmission quadrature baseband signal is as 401 in FIG. The signal point arrangement of the in-phase component 3502 and the quadrature component 3503 of the transmission quadrature baseband signal of the synchronization symbol is as indicated by 402 in FIG. Also, the signal point arrangement of the in-phase component 309 and the quadrature component 310 of the transmission quadrature baseband signal of the guard symbol is as indicated by 403 in FIG.

  The in-phase component switching unit 312 receives the in-phase component 303 of the data symbol transmission quadrature baseband signal, the in-phase component 3502 of the transmission symbol base quadrature signal of the synchronization symbol, the in-phase component 309 of the transmission quadrature baseband signal of the guard symbol, and the frame configuration signal 311. As an input, the in-phase component of the transmission quadrature baseband signal corresponding to the symbol indicated by the frame configuration signal 311 is selected and output as the in-phase component 313 of the selected transmission quadrature baseband signal.

  The orthogonal component switching unit 314 receives the orthogonal component 304 of the data symbol transmission orthogonal baseband signal, the orthogonal component 3503 of the transmission symbol baseband signal of the synchronization symbol, the orthogonal component 310 of the transmission orthogonal baseband signal of the guard symbol, and the frame configuration signal 311. As an input, the orthogonal component of the transmission orthogonal baseband signal corresponding to the symbol indicated by the frame configuration signal 311 is selected and output as the orthogonal component 315 of the selected transmission orthogonal baseband signal.

  The quadrature modulator 316 receives the in-phase component 313 of the selected transmission quadrature baseband signal and the quadrature component 315 of the selected transmission quadrature baseband signal, performs quadrature modulation, and outputs the modulated signal 317, that is, 203 of FIG. .

  Next, the operation of the modulation signal generators 202 and 212 in the frame configuration diagram 34 will be described with reference to FIG.

  The operation of the modulation signal generation unit 202 will be described. Data symbol modulation signal generation section 302 receives transmission digital signal 301, that is, transmission digital signal 201 of channel A in FIG. 34 and frame configuration signal 311, that is, frame configuration signal 210 in FIG. 34, and frame configuration signal 311 is a data symbol. If so, the in-phase component 303 and the quadrature component 304 of the transmission quadrature baseband signal of the data symbol are output.

  Synchronization symbol modulation signal generation section 3601 receives frame configuration signal 311 as input, and outputs the in-phase component 3602 and quadrature component 3603 of the transmission orthogonal baseband signal of the synchronization symbol when the frame configuration signal indicates that it is a synchronization symbol. To do.

  The signal point arrangement of each symbol on the in-phase-orthogonal plane at this time is as shown in FIG. The signal point arrangement of the in-phase component 303 and the quadrature component 304 of the data symbol transmission quadrature baseband signal is as 401 in FIG. The signal point arrangement of the in-phase component 3602 and the quadrature component 3603 of the transmission quadrature baseband signal of the synchronization symbol is as indicated by 402 in FIG.

  The in-phase component switching unit 312 receives the in-phase component 303 of the data symbol transmission quadrature baseband signal, the in-phase component 3602 of the transmission symbol base quadrature signal of the synchronization symbol, and the frame configuration signal 311, and inputs the symbol indicated by the frame configuration signal 311. The in-phase component of the corresponding transmission quadrature baseband signal is selected and output as the in-phase component 313 of the selected transmission quadrature baseband signal.

  The orthogonal component switching unit 314 receives the orthogonal component 304 of the data symbol transmission orthogonal baseband signal, the orthogonal component 3603 of the transmission orthogonal baseband signal of the synchronization symbol, and the frame configuration signal 311 as input, and converts the symbol indicated by the frame configuration signal 311 into the symbol. The orthogonal component of the corresponding transmission orthogonal baseband signal is selected and output as the orthogonal component 315 of the selected transmission orthogonal baseband signal.

  The quadrature modulator 316 receives the in-phase component 313 of the selected transmission quadrature baseband signal and the quadrature component 315 of the selected transmission quadrature baseband signal, performs quadrature modulation, and outputs the modulated signal 317, that is, 203 of FIG. .

  The operation of the modulation signal generation unit 212 will be described. Data symbol modulation signal generation section 302 receives transmission digital signal 301, that is, transmission digital signal 201 of channel B in FIG. 34 and frame configuration signal 311, that is, frame configuration signal 210 in FIG. 34, and frame configuration signal 311 is a data symbol. If so, the in-phase component 303 and the quadrature component 304 of the transmission quadrature baseband signal of the data symbol are output.

  The guard symbol modulation signal generation unit 3601 receives the frame configuration signal 311 and outputs the in-phase component 3602 and the quadrature component 3603 of the transmission quadrature baseband signal of the guard symbol when the frame configuration signal indicates that it is a guard symbol. To do.

  The signal point arrangement of each symbol on the in-phase-orthogonal plane at this time is as shown in FIG. The signal point arrangement of the in-phase component 303 and the quadrature component 304 of the data symbol transmission quadrature baseband signal is as 401 in FIG. The signal point arrangement of the in-phase component 3602 and the quadrature component 3603 of the transmission quadrature baseband signal of the guard symbol is as indicated by 403 in FIG.

  The in-phase component switching unit 312 receives the in-phase component 303 of the data symbol transmission quadrature baseband signal, the in-phase component 3602 of the transmission quadrature baseband signal of the guard symbol, and the frame configuration signal 311, and inputs the symbol indicated by the frame configuration signal 311. The in-phase component of the corresponding transmission quadrature baseband signal is selected and output as the in-phase component 313 of the selected transmission quadrature baseband signal.

  The orthogonal component switching unit 314 receives the orthogonal component 304 of the data symbol transmission orthogonal baseband signal, the orthogonal component 3603 of the transmission orthogonal baseband signal of the guard symbol, and the frame configuration signal 311 as input, and converts the symbol indicated by the frame configuration signal 311 into The orthogonal component of the corresponding transmission orthogonal baseband signal is selected and output as the orthogonal component 315 of the selected transmission orthogonal baseband signal.

  The quadrature modulator 316 receives the in-phase component 313 of the selected transmission quadrature baseband signal and the quadrature component 315 of the selected transmission quadrature baseband signal, performs quadrature modulation, and outputs a modulated signal 317, that is, 213 in FIG. .

  Next, the operation of the receiving apparatus will be described with reference to FIGS. 37, 38, 39, 40, 41, and 42.

  The operation of the receiving apparatus will be described with reference to FIG.

  Radio section 3714 receives reception signal 3713 received by antenna 3712 and outputs a reception quadrature baseband signal 3715.

  Synchronization section 3718 receives reception quadrature baseband signal 3715 as input, detects a synchronization symbol in the signal transmitted by the transmission apparatus, and outputs timing signal 3719 time-synchronized with the transmission apparatus. The timing signal 3719 is a timing signal used in each unit in the receiving apparatus.

  Next, the operation of the receiving apparatus will be described with reference to FIG.

  Radio section 3703 receives reception signal 3702 received by antenna 3701 and outputs reception quadrature baseband signal 3704.

  Synchronizing unit 3801 receives reception quadrature baseband signal 3704, detects a synchronization symbol in the signal transmitted by the transmission apparatus, and outputs timing signal 3802 time-synchronized with the transmission apparatus. The timing signal 3802 is input to, for example, the transmission path distortion estimation unit 3705 and the signal separation unit 3807, and a signal is extracted from the received quadrature baseband signal 3704 in accordance with the timing of the timing signal 3802 and signal processing is performed.

  Radio section 3708 receives reception signal 3707 received by antenna 3706 and outputs reception quadrature baseband signal 3709.

  Synchronizing section 3803 receives reception quadrature baseband signal 3709 as input, detects a synchronization symbol in the signal transmitted by the transmission apparatus, and outputs timing signal 3804 time-synchronized with the transmission apparatus. The timing signal 3804 is input to, for example, the transmission path distortion estimation unit 3710 and the signal separation unit 3807, and a signal is extracted from the received quadrature baseband signal 3709 in accordance with the timing of the timing signal 3804, and signal processing is performed.

  Radio section 3714 receives reception signal 3713 received by antenna 3712 and outputs a reception quadrature baseband signal 3715.

  Synchronization section 3805 receives reception quadrature baseband signal 3715 as input, detects a synchronization symbol in the signal transmitted by the transmission apparatus, and outputs timing signal 3806 time-synchronized with the transmission apparatus. The timing signal 3806 is input to, for example, the transmission path distortion estimation unit 3716 and the signal separation unit 3807, and a signal is extracted from the received quadrature baseband signal 3715 in accordance with the timing of the timing signal 3806, and signal processing is performed.

  Next, the operation of the receiving apparatus will be described with reference to FIG.

  Electric field strength estimating section 3901 receives reception signal 3702 received by antenna 3701, estimates the received electric field strength, and outputs electric field strength estimation signal 3902.

  Similarly, field strength estimation section 3903 receives reception signal 3707 received by antenna 3706, estimates the received field strength, and outputs field strength estimation signal 3904. The field strength estimation unit 3905 receives the received signal 3713 received by the antenna 3712, estimates the received field strength, and outputs a field strength estimation signal 3906.

  Synchronizing section 3907 receives reception quadrature baseband signal 3704, detects a synchronization symbol in the signal transmitted by the transmission apparatus, and outputs timing signal 3908 that is time-synchronized with the transmission apparatus.

  Similarly, synchronization section 3909 receives reception quadrature baseband signal 3709 as input, detects a synchronization symbol in the signal transmitted by the transmission apparatus, and outputs timing signal 3910 time-synchronized with the transmission apparatus. Synchronizing section 3911 receives reception quadrature baseband signal 3715 as input, detects a synchronization symbol in the signal transmitted by the transmission apparatus, and outputs timing signal 3912 time-synchronized with the transmission apparatus.

  The synchronization signal selection unit 3913 receives the electric field strength estimation signals 3902, 3904, 3906, and timing signals 3908, 3910, 3912 as input. For example, when the electric field strength of the received signal of the antenna 3701 is the best from the electric field strength estimation signal, The signal 3908 is output as the selected timing signal 3914. In this way, the timing signal obtained from the received signal having the best received electric field strength is used as the timing signal of the receiving device.

  Next, the operation of the receiving apparatus will be described with reference to FIG.

  The signal selection unit 4001 receives the electric field strength estimation signals 3902, 3904, 3906 and the reception quadrature baseband signals 3704, 3709, 3715. For example, when the electric field strength of the received signal of the antenna 3701 is the best from the electric field strength signal, The reception orthogonal baseband signal 3704 is output as the selected reception orthogonal baseband signal 4002.

  Synchronizing section 4003 receives selected received quadrature baseband signal 4002, detects a synchronization symbol in the signal transmitted by the transmission apparatus, and outputs timing signal 4004 time-synchronized with the transmission apparatus. In this way, the timing signal obtained from the received signal having the best received electric field strength is used as the timing signal of the receiving device.

  Next, the operation of the receiving apparatus will be described with reference to FIG.

  FIG. 41 is different from FIG. 39 in that the electric field strength is obtained using the received quadrature baseband signal.

  Electric field strength estimation section 3901 receives reception quadrature baseband signal 3704, estimates the received electric field strength, and outputs electric field strength estimation signal 3902.

  Electric field strength estimating section 3903 receives reception quadrature baseband signal 3709 as input, estimates the received electric field strength, and outputs electric field strength estimation signal 3904.

  Electric field strength estimation section 3905 receives reception quadrature baseband signal 3715, estimates the received electric field strength, and outputs electric field strength estimation signal 3906.

  FIG. 42 is different from FIG. 40 in that the electric field strength is obtained using the received quadrature baseband signal.

  In the above description, the electric field intensity is described as an example of the parameter of the radio wave propagation environment. However, the present invention is not limited to this, and the Doppler frequency, the number of multipath paths, and the like may be used as parameters.

  As described above, time synchronization between the transmission device and the reception device can be performed.

  However, in this embodiment, the number of multiplexed channels has been described as two, but this is not a limitation. Further, the frame configuration is not limited to that shown in FIGS. The data symbol modulation method is not limited to QPSK modulation, and the modulation method of each channel may be different. All channels may use a spread spectrum communication system. A spread spectrum communication method and a method that does not use the spread spectrum communication method may be mixed.

  The synchronization symbols in FIGS. 33 and 34 are symbols for the receiver to perform time synchronization with the transmitter. However, the symbol is not limited to this. For example, the receiver has a frequency offset with the transmitter. It may be a symbol for estimation.

  In addition, the configuration of the transmission apparatus according to the present embodiment is not limited to that shown in FIGS. 2, 35, and 36. When the number of channels increases, the parts configured by 201 to 208 in FIG. Will increase.

  In addition, the configuration of the receiving apparatus in this embodiment is not limited to FIGS. 37, 38, 39, 40, 41, and 42, and the number of antennas may be increased.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  As described above, according to the present embodiment, a symbol transmission method for synchronization of a transmission method for multiplexing modulated signals of a plurality of channels in the same frequency band, and a transmitter and a receiver in the transmission method are provided. By multiplexing the modulation signals of a plurality of channels on the same frequency, the data transmission speed can be improved and at the same time time synchronization between the transmitting device and the receiving device can be performed.

(Embodiment 9)
In Embodiment 9, a transmission method of transmitting a synchronization symbol in a spread spectrum communication system, a transmission apparatus, and a reception apparatus thereof will be described in a transmission method of transmitting modulated signals of a plurality of channels from a plurality of antennas in the same frequency band.

  FIG. 4 shows the signal point arrangement in the in-phase-orthogonal plane in the present embodiment.

  FIG. 12 shows an example of the configuration of the transmission apparatus according to this embodiment.

  FIG. 43 shows an example of a frame configuration on the time axis in the present embodiment, 4301 and 4305 are synchronization symbols, 4302 and 4304 are guard symbols, and 4303 and 4306 are data symbols.

  FIG. 44 shows an example of a frame structure on the time axis in the present embodiment, where 4401 is a synchronization symbol, 4402 and 4404 are data symbols, and 4403 is a guard symbol.

  FIG. 45 shows an example of a frame configuration on the time axis in this embodiment, 4503, 4505, and 4507 are guard symbols, 4502, 4504, 4506, and 4508 are data symbols, and 4501 is a synchronization symbol.

  FIG. 46 shows an example of the configuration of the modulation signal generators 1202 and 1210 in FIG. 12, and the same reference numerals are given to parts that operate in the same manner as in FIG.

  Guard symbol modulation signal generation section 4601 receives frame configuration signal 1320 as input, and outputs in-phase component 4602 and quadrature component 4603 of the transmission quadrature baseband signal of the guard symbol when frame configuration signal 1320 indicates a guard symbol.

  Synchronization symbol modulation signal generation section 4604 receives frame configuration signal 1320 as input, and outputs in-phase component 4605 and quadrature component 4606 of the transmission orthogonal baseband signal of the synchronization symbol when frame configuration signal 1320 indicates a synchronization symbol.

  FIG. 47 shows an example of the configuration of the modulation signal generators 1202 and 1210 in FIG. 12, and the same reference numerals are given to parts that operate in the same manner as in FIG.

  Guard symbol or synchronization symbol modulation signal generation section 4701 receives frame configuration signal 1320 as input, and outputs in-phase component 4702 and quadrature component 4703 of the transmission quadrature baseband signal of the guard symbol or synchronization symbol.

  FIG. 48 shows an example of the configuration of the modulation signal generators 1202 and 1210 in FIG. 12, and the same reference numerals are given to the parts that operate in the same manner as in FIG.

  Primary modulation section 4802 receives control information 4801 and frame configuration signal 1320 as inputs, and outputs in-phase component 4803 and quadrature component 4804 of the transmission quadrature baseband signal after the primary modulation.

  Synchronization symbol modulation signal generation section 4805 receives frame configuration signal 1320 as input, and outputs in-phase component 4806 and orthogonal component 4807 of the transmission quadrature baseband signal of the synchronization symbol.

  Spreading section 4808 receives in-phase component 4803 and quadrature component 4804 of the transmission quadrature baseband signal after the primary modulation, in-phase component 4806 and quadrature component 4807 of the transmission quadrature baseband signal of the synchronization symbol, spreading code 1317, and frame configuration signal 1320. And an in-phase component 4809 and a quadrature component 4810 of the transmission quadrature baseband signal after spreading of symbols corresponding to the frame configuration signal 1320 are output.

  FIG. 49 shows an example of the configuration of the modulation signal generators 1202 and 1210 in FIG. 12, and the same reference numerals are given to parts that operate in the same manner as in FIGS.

  Guard symbol modulation signal generation section 4901 receives frame configuration signal 1320 and outputs in-phase component 4902 and quadrature component 4903 of the transmission quadrature baseband signal of the guard symbol.

  Spreading section 4808 receives in-phase component 4803 and quadrature component 4804 of the transmission quadrature baseband signal after the primary modulation, in-phase component 4902 and quadrature component 4903 of the transmission quadrature baseband signal of the guard symbol, spreading code 1317, and frame configuration signal 1320. And an in-phase component 4809 and a quadrature component 4810 of the transmission quadrature baseband signal after spreading of symbols corresponding to the frame configuration signal 1320 are output.

  FIG. 37 illustrates an example of a configuration of the reception device in this embodiment.

  FIG. 38 illustrates an example of a configuration of the reception device in this embodiment.

  FIG. 39 illustrates an example of a configuration of the reception device in this embodiment.

  FIG. 40 illustrates an example of a configuration of the reception device in this embodiment.

  FIG. 41 illustrates an example of a configuration of the reception device in this embodiment.

  FIG. 42 illustrates an example of a configuration of the reception device in this embodiment.

  The operation of the transmission apparatus will be described with reference to FIGS. 4, 12, 43, 44, 45, 46, 47, 48, and 49. FIG.

  In FIG. 12, the frame configuration generation unit 1217 outputs the frame configuration information shown in FIG. 43, FIG. 44, or FIG. 45 as the frame configuration signal 1218. The modulation signal generation unit 1202 of the spread spectrum communication system A receives the frame configuration signal 1218 and the transmission digital signal 1201 of the spread spectrum communication system A, and outputs the modulation signal 1203 of the spread spectrum communication system A according to the frame configuration. Then, modulated signal generation section 1210 of spread spectrum communication system B receives frame configuration signal 1218 and transmission digital signal 1209 of spread spectrum communication system B as an input, and outputs modulated signal 1211 of spread spectrum communication system B according to the frame configuration. To do.

  Next, the operation of the modulation signal generation sections 1202 and 1210 when the frame configuration is shown in FIG. 43 will be described with reference to FIG.

  46, the guard symbol modulation signal generation unit 4601 in FIG. 46 receives the frame configuration signal 1320 as an input, and when the frame configuration signal 1320 indicates a guard symbol, the transmission orthogonal baseband of the guard symbol. An in-phase component 4602 and a quadrature component 4603 of the signal are output.

  Synchronization symbol modulation signal generation section 4604 receives frame configuration signal 1320 as input, and outputs in-phase component 4605 and quadrature component 4606 of the transmission orthogonal baseband signal of the synchronization symbol when frame configuration signal 1320 indicates a synchronization symbol.

  The signal point arrangement of each symbol on the in-phase-orthogonal plane at this time is as shown in FIG. The signal point arrangement of the in-phase components 1311 and 1318 and the quadrature components 1312 and 1319 of the transmission quadrature baseband signal of the data symbol is as indicated by 401 in FIG. And the signal point arrangement | positioning of the in-phase component 4605 and the quadrature component 4606 of the transmission orthogonal baseband signal of a synchronous symbol is as 402 of FIG. Also, the signal point arrangement of the in-phase component 4602 and the quadrature component 4603 of the transmission quadrature baseband signal of the guard symbol is as indicated by 403 in FIG.

  Next, operations of modulated signal generation sections 1202 and 1210 when the frame configuration is shown in FIG. 44 will be described using transmission sections of spread spectrum communication system A and spread spectrum communication system B as an example with reference to FIG.

  In the transmitter of the spread spectrum communication system A, the detailed configuration of the modulation signal generator 1202 is as shown in FIG. 47, when frame configuration signal 1320 is input and frame configuration signal 1320 indicates a synchronization symbol, in-phase component 4702 and quadrature component 4702 of the transmission symbol baseband signal of the synchronization symbol are received. The component 4703 is output.

  In the transmission unit of spread spectrum communication system B, the detailed configuration of the modulation signal generation unit 1210 is as shown in FIG. 47, when frame configuration signal 1320 is input and frame configuration signal 1320 indicates a guard symbol, in-phase component 4702 and quadrature component 4702 of the transmission quadrature baseband signal of the guard symbol are received. The component 4703 is output.

  The signal point arrangement of each symbol on the in-phase-orthogonal plane at this time is as shown in FIG. The signal point arrangement of the in-phase components 1311 and 1318 and the quadrature components 1312 and 1319 of the transmission quadrature baseband signal of the data symbol is as indicated by 401 in FIG. The signal point arrangement of the in-phase component and the quadrature component of the transmission quadrature baseband signal of the synchronization symbol is as indicated by 402 in FIG. Further, the signal point arrangement of the in-phase component and the quadrature component of the transmission quadrature baseband signal of the guard symbol is as indicated by 403 in FIG.

  Next, the operation of modulated signal generators 1202 and 1210 when the frame configuration is FIG. 45 will be described with reference to FIG. 48 and FIG. 49 using transmission units of spread spectrum communication method A and spread spectrum communication method B as an example.

  In the transmission unit of the spread spectrum communication system A, the detailed configuration of the modulation signal generation unit 1202 is as shown in FIG. 48 receives control information 4801 and frame configuration signal 1320 as input, and outputs in-phase component 4803 and quadrature component 4804 of the transmission quadrature baseband signal of control information.

  Synchronization symbol modulation signal generation section 4805 receives frame configuration signal 1320 as input, and outputs in-phase component 4806 and quadrature component 4807 of the transmission quadrature baseband signal of the synchronization symbol when the frame configuration signal indicates that it is a synchronization symbol. To do.

  Spreading unit 4808 receives in-phase component 4803 and quadrature component 4804 of the transmission orthogonal baseband signal of the control information, in-phase component 4806 and quadrature component 4807 of the transmission quadrature baseband signal of the synchronization symbol, spread code 1317, and frame configuration signal 1320 as inputs. Then, the transmission orthogonal baseband signal of the symbol indicated by the frame configuration signal 1320 is multiplied by the spreading code 1317 to output the in-phase component 4809 and the orthogonal component 4810 of the transmission orthogonal baseband signal after spreading of the control channel.

  In the transmitter of the spread spectrum communication system B, the detailed configuration of the modulation signal generator 1210 is as shown in FIG.

  Guard symbol modulation signal generation section 4901 receives frame configuration signal 1320 as input, and outputs in-phase component 4902 and quadrature component 4903 of the transmission quadrature baseband signal of the guard symbol when the frame configuration signal indicates that it is a guard symbol. To do.

  Spreading unit 4808 receives in-phase component 4803 and quadrature component 4804 of the transmission orthogonal baseband signal of the control information, in-phase component 4902 and quadrature component 4903 of the transmission quadrature baseband signal of the guard symbol, spreading code 1317, and frame configuration signal 1320 as inputs. Then, the transmission orthogonal baseband signal of the symbol indicated by the frame configuration signal 1320 is multiplied by the spreading code 1317 to output the in-phase component 4809 and the orthogonal component 4810 of the transmission orthogonal baseband signal after spreading of the control channel.

  The signal point arrangement of each symbol on the in-phase-orthogonal plane at this time is as shown in FIG. The signal point arrangement of the in-phase component and the quadrature component of the transmission quadrature baseband signal of the data symbol and control symbol is as 401 in FIG. The signal point arrangement of the in-phase component and the quadrature component of the transmission quadrature baseband signal of the synchronization symbol is as indicated by 402 in FIG. Further, the signal point arrangement of the in-phase component and the quadrature component of the transmission quadrature baseband signal of the guard symbol is as indicated by 403 in FIG.

  Next, the operation of the receiving apparatus will be described with reference to FIGS. 37, 38, 39, 40, 41, and 42.

  37, FIG. 38, FIG. 39, FIG. 40, FIG. 41, and FIG. 42, the demodulation units 3723 and 3725 demodulate the spread spectrum communication method, that is, despread, and then demodulate.

  In the above description, the electric field intensity is described as an example of the parameter of the radio wave propagation environment. However, the present invention is not limited to this, and the Doppler frequency, the number of multipath paths, and the like may be used as parameters.

  As described above, time synchronization between the transmission device and the reception device can be performed.

  However, in the present embodiment, the transmission antenna is described as 2, but the present invention is not limited to this. In addition, although the number of spread spectrum communication schemes to be multiplexed has been described as 2, the present invention is not limited to this. Further, the frame configuration is not limited to those shown in FIGS. 43, 44, and 45. Moreover, although the spread number is set to two channels in both the spread spectrum communication systems A and B, it is not limited to this.

  43, 44, and 45 are symbols for the receiver to perform time synchronization with the transmitter. However, the symbol is not limited to this. For example, the receiver may be connected to the transmitter. A symbol may be used to estimate the frequency offset.

  The configuration of the transmission apparatus according to the present embodiment is not limited to that shown in FIGS. 12 and 13, and when the number of spread spectrum communication methods increases, the number of parts configured from 1201 to 1208 in FIG. 12 increases accordingly. become. Further, when the number of channels increases, the portion constituted by 1306 and 1309 increases accordingly.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  As described above, according to the present embodiment, in a transmission method for transmitting modulated signals of a plurality of channels from a plurality of antennas in the same frequency band, a method for transmitting a synchronization symbol in a spread spectrum communication system, and a transmission apparatus and reception thereof By using the device, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the time synchronization between the transmission device and the reception device can be performed.

(Embodiment 10)
In a tenth embodiment, a transmission method for transmitting a modulation symbol of a plurality of channels in the same frequency band from a plurality of antennas, a transmission method of a synchronization symbol in the OFDM scheme, and a transmission device and a reception device using the same will be described.

  FIG. 4 shows signal point arrangement in the in-phase I-orthogonal Q plane.

  FIG. 25 is an example of a configuration of the transmission device in this embodiment.

  FIG. 50 shows an example of a frame configuration on the time and frequency axes in the present embodiment, where 5001 is a synchronization symbol and 5002 is a data symbol.

  FIG. 51 shows an example of a frame configuration on the time and frequency axes in the present embodiment, where 5101 is a synchronization symbol and 5102 is a data symbol.

  FIG. 52 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same way as in FIG. 26 are given the same reference numerals.

  Synchronization section 5201 receives reception quadrature baseband signal 2604, takes time synchronization with the transmission apparatus, and outputs timing signal 5202.

  Synchronization section 5203 receives reception quadrature baseband signal 2614 as input, synchronizes time with the transmission apparatus, and outputs timing signal 5204.

  FIG. 53 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same way as in FIG. 26 are given the same reference numerals.

  Synchronizing unit 5301 receives reception quadrature baseband signal 2604, takes time synchronization with the transmission apparatus, and outputs timing signal 5302.

  FIG. 54 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same manner as in FIGS. 37 and 39 are given the same reference numerals.

  Discrete Fourier transform section 5401 receives reception quadrature baseband signal 3704 and selected timing signal 3914 as input, and outputs signal 5402 after the discrete Fourier transform.

  Similarly, discrete Fourier transform section 5403 receives received quadrature baseband signal 3709 and selected timing signal 3914 as input, and outputs signal 5404 after the discrete Fourier transform.

  Discrete Fourier transform section 5405 receives reception quadrature baseband signal 3715 and selected timing signal 3914 as input, and outputs signal 5406 after the discrete Fourier transform.

  FIG. 55 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same manner as in FIG. 37, FIG. 39, FIG. 40, and FIG.

  FIG. 56 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same manner as in FIG. 37, FIG. 39, and FIG.

  FIG. 57 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same manner as in FIG. 37, FIG. 39, FIG. 40, and FIG.

  And operation | movement of a transmitter is demonstrated using FIG.4, FIG.25, FIG.50 and FIG.

  A transmission apparatus that transmits the modulation signal having the frame configuration of FIG. 50 will be described.

  The frame configuration signal generation unit 2521 in FIG. 25 outputs the frame configuration information in FIG. 50 as the frame configuration signal 2522.

  In FIG. 50, when a synchronization symbol is transmitted on channel A at time 0, channel B does not transmit a signal. That is, the signal 403 in FIG. Similarly, when transmitting a synchronization symbol on channel B at time 1, channel A does not transmit a signal. That is, the signal 403 in FIG.

  A transmission apparatus that transmits the modulation signal having the frame configuration of FIG. 51 will be described.

  The frame configuration signal generation unit 2521 in FIG. 25 outputs the frame configuration information in FIG. 51 as the frame configuration signal 2522.

  In FIG. 51, when a synchronization symbol is transmitted on channel A at time 0, channel B does not transmit a signal. That is, the signal 403 in FIG.

  Next, with reference to FIG. 50, FIG. 51, FIG. 52, FIG. 53, FIG. 54, FIG.

  In FIG. 52, synchronization section 5201 receives reception quadrature baseband signal 2604, detects the synchronization symbol transmitted in FIG. 50 or 51, takes time synchronization with the transmission apparatus, and outputs it as timing signal 5202. .

  Discrete Fourier transform section 2605 receives received quadrature baseband signal 2604 and timing signal 5202 as input, performs discrete Fourier transform on received quadrature baseband signal 2604 based on timing signal 5202, and outputs signal 2606 after the discrete Fourier transform. .

  Synchronization section 5203 receives reception quadrature baseband signal 2614 as input, detects the synchronization symbol transmitted in FIG. 50 or FIG. 51, synchronizes time with the transmission apparatus, and outputs it as timing signal 5204.

  The discrete Fourier transform unit 2615 receives the received quadrature baseband signal 2614 and the timing signal 5204, performs a discrete Fourier transform on the received quadrature baseband signal 2614 based on the timing signal 5204, and outputs a signal 2616 after the discrete Fourier transform. .

  In FIG. 53, synchronization section 5301 receives reception quadrature baseband signal 2604, detects the synchronization symbol transmitted in FIG. 50 or 51, takes time synchronization with the transmission apparatus, and outputs it as timing signal 5302. .

  Discrete Fourier transform section 2605 receives received quadrature baseband signal 2604 and timing signal 5302 as input, performs discrete Fourier transform on received quadrature baseband signal 2604 based on timing signal 5302, and outputs signal 2606 after the discrete Fourier transform. .

  The discrete Fourier transform unit 2615 receives the received quadrature baseband signal 2614 and the timing signal 5302 as input, performs a discrete Fourier transform on the received quadrature baseband signal 2614 based on the timing signal 5302, and outputs a signal 2616 after the discrete Fourier transform. .

  In FIG. 54, a discrete Fourier transform unit 5401 receives a received quadrature baseband signal 3704 and a timing signal 3914 obtained from an antenna having the best received electric field strength, and based on the timing signal 3914, receives a received quadrature baseband signal 3704. Discrete Fourier transform is performed, and a signal 5402 after the discrete Fourier transform is output.

  Similarly, discrete Fourier transform section 5403 receives received quadrature baseband signal 3709 and timing signal 3914 obtained from the antenna having the best received electric field strength as input, and based on timing signal 3914, receives quadrature baseband signal 3709 discretely. Fourier transform is performed, and a signal 5404 after discrete Fourier transform is output.

  The discrete Fourier transform unit 5405 receives the reception quadrature baseband signal 3715 and the timing signal 3914 obtained from the antenna having the best reception electric field strength, and based on the timing signal 3914, converts the reception quadrature baseband signal 3715 to the discrete Fourier transform. Then, the signal 5406 after the discrete Fourier transform is output.

  In FIG. 55, a discrete Fourier transform unit 5401 receives a reception quadrature baseband signal 3704 and a timing signal 4004 obtained from an antenna having the best received electric field strength as input, and based on the timing signal 4004, receives a reception quadrature baseband signal 3704. Discrete Fourier transform is performed, and a signal 5402 after the discrete Fourier transform is output.

  Similarly, discrete Fourier transform section 5403 receives reception quadrature baseband signal 3709 and timing signal 4004 obtained from the antenna having the best received electric field strength as input, and based on timing signal 4004, receives quadrature baseband signal 3709 discretely. Fourier transform is performed, and a signal 5404 after discrete Fourier transform is output.

  The discrete Fourier transform unit 5405 receives the received quadrature baseband signal 3715 and the timing signal 4004 obtained from the antenna having the best received electric field strength as input, and based on the timing signal 4004, converts the received quadrature baseband signal 3715 to the discrete Fourier transform. Then, the signal 5406 after the discrete Fourier transform is output.

  In FIG. 56, a discrete Fourier transform unit 5401 receives a reception quadrature baseband signal 3704 and a timing signal 3914 obtained from an antenna having the best reception electric field strength as input, and based on the timing signal 3914, receives a reception quadrature baseband signal 3704. Discrete Fourier transform is performed, and a signal 5402 after the discrete Fourier transform is output.

  Similarly, discrete Fourier transform section 5403 receives received quadrature baseband signal 3709 and timing signal 3914 obtained from the antenna having the best received electric field strength as input, and based on timing signal 3914, receives quadrature baseband signal 3709 discretely. Fourier transform is performed, and a signal 5404 after discrete Fourier transform is output.

  The discrete Fourier transform unit 5405 receives the reception quadrature baseband signal 3715 and the timing signal 3914 obtained from the antenna having the best reception electric field strength, and based on the timing signal 3914, converts the reception quadrature baseband signal 3715 to the discrete Fourier transform. Then, the signal 5406 after the discrete Fourier transform is output.

  In FIG. 57, the discrete Fourier transform unit 5401 receives the reception quadrature baseband signal 3704 and the timing signal 4004 obtained from the antenna having the best reception electric field strength, and based on the timing signal 4004, receives the reception quadrature baseband signal 3704. Discrete Fourier transform is performed, and a signal 5402 after the discrete Fourier transform is output.

  Similarly, discrete Fourier transform section 5403 receives reception quadrature baseband signal 3709 and timing signal 4004 obtained from the antenna having the best received electric field strength as input, and based on timing signal 4004, receives quadrature baseband signal 3709 discretely. Fourier transform is performed, and a signal 5404 after discrete Fourier transform is output.

  The discrete Fourier transform unit 5405 receives the received quadrature baseband signal 3715 and the timing signal 4004 obtained from the antenna having the best received electric field strength as input, and based on the timing signal 4004, converts the received quadrature baseband signal 3715 to the discrete Fourier transform. Then, the signal 5406 after the discrete Fourier transform is output.

  In the above description, the electric field intensity is described as an example of the parameter of the radio wave propagation environment. However, the present invention is not limited to this, and the Doppler frequency, the number of multipath paths, and the like may be used as parameters.

  As described above, time synchronization between the transmission device and the reception device can be performed.

  However, in the present embodiment, the transmission antenna is described as 2, but the present invention is not limited to this. In addition, although the number of multiplexed channels has been described as two, the present invention is not limited to this. Further, the frame configuration is not limited to those shown in FIGS.

  50 and 51 are symbols for the receiver to perform time synchronization with the transmitter. However, the present invention is not limited to this. For example, the receiver has a frequency offset with the transmitter. A symbol may be used for estimation.

  The configuration of the transmission apparatus in the present embodiment is not limited to FIG. 25, and the configuration of the reception apparatus is not limited to FIGS. 52, 53, 54, 55, 56, and 57.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  As described above, according to the present embodiment, in a transmission method for transmitting modulated signals of a plurality of channels from a plurality of antennas in the same frequency band, a method for transmitting a synchronization symbol in the OFDM scheme, a transmission apparatus using the same, and a reception By using the device, the data transmission speed is improved by multiplexing the modulation signals of a plurality of channels on the same frequency, and at the same time, the time synchronization between the transmission device and the reception device can be performed.

(Embodiment 11)
In Embodiment 11, in a transmission method in which modulated signals of a plurality of channels are transmitted from a plurality of antennas in the same frequency band, a reception apparatus using the transmission method in which a transmission symbol includes a control symbol explain.

  33, FIG. 34, FIG. 43, FIG. 44, FIG. 45, FIG. 50, and FIG. 51 show an example of the frame configuration in the present embodiment.

  FIG. 58 shows an example of the configuration of the receiving apparatus according to the present embodiment, and the same reference numerals are given to parts that operate in the same manner as in FIG.

  Frequency offset estimation section 5801 receives reception quadrature baseband signal 5801, estimates the frequency offset with the transmission apparatus, and outputs frequency offset estimation signal 5802.

  The frequency control unit 5803 receives the frequency offset estimation signal 5802, performs frequency control, and outputs, for example, a signal 5804 that is a source signal of the radio unit.

  FIG. 59 shows an example of the configuration of the receiving apparatus according to this embodiment, and parts that operate in the same way as in FIG.

  Frequency offset estimation section 5901 receives reception quadrature baseband signal 3704, estimates the frequency offset, and outputs frequency offset estimation signal 5902.

  Frequency offset estimation section 5903 receives reception quadrature baseband signal 3709 as input, estimates the frequency offset, and outputs frequency offset estimation signal 5904.

  Frequency offset estimation section 5905 receives reception quadrature baseband signal 3715 as input, estimates a frequency offset, and outputs frequency offset estimation signal 5906.

  The calculation unit 5907 receives the frequency offset estimation signals 5902, 5904, and 5906 as inputs, for example, averages and outputs an averaged frequency offset estimation signal 5908.

  The frequency control unit 5909 receives the averaged frequency offset estimation signal 5908 as an input, and outputs a signal 5910 that serves as a source signal of the radio unit, for example.

  FIG. 60 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same manner as in FIGS. 37 and 39 are given the same reference numerals.

  Frequency offset estimation section 6001 receives reception quadrature baseband signal 3704, estimates the frequency offset, and outputs frequency offset estimation signal 6002.

  Frequency offset estimation section 6003 receives reception quadrature baseband signal 3709 as input, estimates a frequency offset, and outputs frequency offset estimation signal 6004.

  Frequency offset estimation section 6005 receives reception quadrature baseband signal 3715, estimates the frequency offset, and outputs frequency offset estimation signal 6006.

  The calculation unit 6007 receives the frequency offset estimation signals 6002, 6004, and 6006, and the electric field strength estimation signals 3902, 3904, and 3906, performs weighting on the electric field strength, averages the frequency offset signals, and averages the frequency offset estimation signal 6008. Is output.

  The frequency controller 6009 receives the averaged frequency offset estimation signal 6008 as an input, and outputs, for example, a signal 6010 that is a source signal of the radio unit.

  FIG. 61 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same way as in FIGS. 37 and 39 are given the same reference numerals.

  Frequency offset estimation section 6101 receives the selected received orthogonal baseband signal as input, estimates the frequency offset, and outputs frequency offset estimation signal 6102.

  The frequency control unit 6103 receives the frequency offset estimation signal 6102 and outputs, for example, a signal 6104 that is a source signal of the radio unit.

  FIG. 62 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same manner as in FIG. 37, FIG. 39, and FIG.

  FIG. 63 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same manner as in FIG. 37, FIG. 39, FIG. 40, and FIG.

  FIG. 64 shows an example of the configuration of the receiving apparatus according to this embodiment, and parts that operate in the same way as in FIG.

  Frequency offset estimation section 6401 receives reception quadrature baseband signal 2604, estimates the frequency offset, and outputs frequency offset estimation signal 6402.

  Frequency offset estimation section 6403 receives reception quadrature baseband signal 2614 as input, estimates a frequency offset, and outputs frequency offset estimation signal 6404.

  The calculation unit 6405 receives the frequency offset estimation signals 6402 and 6404 as inputs, for example, averages and outputs an averaged frequency offset estimation signal 6406.

  The frequency control unit 6407 receives the averaged frequency offset estimation signal 6406 as an input, and outputs, for example, a signal 6408 that is a source signal of the radio unit.

  FIG. 65 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same manner as in FIG. 26 are given the same reference numerals.

  Frequency offset estimation section 6501 receives reception quadrature baseband signal 2604, estimates the frequency offset, and outputs frequency offset estimation signal 6502.

  The frequency control unit 6503 receives the frequency offset estimation signal 6502 and outputs, for example, a signal 6504 that is a source signal of the radio unit.

  FIG. 66 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same manner as in FIG. 37, FIG. 39, and FIG.

  Frequency offset estimation section 6601 receives reception quadrature baseband signal 3704 as input, estimates the frequency offset, and outputs frequency offset estimation signal 6602.

  Frequency offset estimation section 6603 receives reception quadrature baseband signal 3709 as input, estimates a frequency offset, and outputs frequency offset estimation signal 6604.

  Frequency offset estimation section 6605 receives reception quadrature baseband signal 3715 as input, estimates the frequency offset, and outputs frequency offset estimation signal 6606.

  The calculation unit 6607 receives the frequency offset estimation signals 6602, 6604, 6606 and the electric field strength estimation signals 3902, 3904, 3906, weights the electric field strengths, averages the frequency offset signals, and averages the frequency offset estimation signals 6608. Is output.

  The frequency control unit 6609 receives the averaged frequency offset estimation signal 6608 as an input, and outputs, for example, a signal 6610 that is a source signal of the radio unit.

  FIG. 67 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same manner as in FIG. 37, FIG. 39, FIG. 40, and FIG.

  Frequency offset estimation section 6701 receives received quadrature baseband signal 4002 as input, estimates the frequency offset, and outputs frequency offset estimation signal 6702.

  The frequency control unit 6703 receives the frequency offset estimation signal 6702 and outputs, for example, a signal 6704 that is a source signal of the radio unit.

  FIG. 68 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same manner as in FIG. 37, FIG. 39, FIG. 54, and FIG.

  FIG. 69 shows an example of the configuration of the receiving apparatus according to the present embodiment, and parts that operate in the same way as in FIGS. 37, 39, 40, 54, and 67 are given the same reference numerals.

  Next, in a transmission method for transmitting modulated signals of a plurality of channels in the same frequency band from a plurality of antennas, a reception apparatus using a transmission method in which a transmission control signal includes a control symbol will be described.

  33, FIG. 34, FIG. 43, FIG. 44, FIG. 45, FIG. 50, and FIG. 51 show an example of the frame configuration in this embodiment. In the receiving apparatus, for example, the frequency offset is set using a synchronization symbol. presume. At this time, the transmission apparatus has only one frequency source, and the transmission signal transmitted from each antenna is a signal that is frequency-synchronized.

  Next, the operation of the receiving apparatus in FIG. 58 will be described.

  Frequency offset estimation section 5801 receives reception quadrature baseband signal 3715 as an input, for example, estimates a frequency offset from a synchronization symbol, and outputs a frequency offset estimation signal.

  Demodulation sections 3723 and 3725 remove the frequency offset from the input frequency offset estimation signal 5802.

  The frequency control unit 5803 receives the frequency offset estimation signal 5802, removes the frequency offset, and outputs a radio unit source signal 5804.

  Next, the operation of the receiving apparatus in FIG. 59 will be described with respect to parts different from those in FIG.

  The calculation unit 5907 receives the frequency offset estimation signals 5902, 5904, and 5906 as an input, averages them, and outputs an averaged frequency offset estimation signal 5908. This averaging improves the estimation accuracy of the frequency offset.

  Next, the operation of the receiving apparatus in FIG. 60 will be described with respect to parts different from FIG.

  The calculation unit 6007 receives the electric field strength estimation signals 3902, 3904, 3906 and the frequency offset estimation signals 6002, 6004, 6006, performs weighting according to the electric field strength, and outputs an averaged frequency offset estimation signal. Thereby, the estimation accuracy of the frequency offset is improved by increasing the reliability of the frequency offset estimation signal having a strong electric field strength.

  Next, the operation of the receiving apparatus in FIG. 61 will be described with respect to parts different from those in FIG.

  Since the signal selection unit 4001 outputs a received quadrature baseband signal having a strong electric field strength at 4002, the frequency offset estimation unit 6101 improves the estimation accuracy of the frequency offset.

  62 and 63 differ from FIGS. 60 and 61 in that the electric field strength is obtained from the received quadrature baseband signal.

  As described above, the frequency offset can be removed in the transmission method in which modulated signals of a plurality of channels are transmitted from a plurality of antennas in the same frequency band, and in the reception apparatus using the spread spectrum communication method.

  64, 65, 66, 67, 68, and 69 show the configuration of the receiving apparatus when the OFDM method is used as the transmission method, and the operation is shown in FIGS. 58, 59, 60, and 61. 62 and FIG. 63.

  As described above, the frequency offset can be removed in the receiving apparatus when the OFDM method is used in the transmission method of transmitting modulated signals of a plurality of channels from a plurality of antennas in the same frequency band.

  As described above, the frequency offset between the transmission device and the reception device can be removed.

  However, in the present embodiment, the frame configuration is not limited to that shown in FIGS. 33, 34, 43, 44, 45, 50, and 51.

  In addition, in the transmission device and the reception device, the source signal input to the radio unit is made common to the radio unit provided for each antenna, so that the frequency offset is estimated in common to a plurality of antennas. Can do.

  Similarly, in the transmission device and the reception device, the modulation signal generation in the transmission device and the source signal for synchronization in the reception device are shared by the modulation signal generation unit and the synchronization unit provided for each antenna, so that time synchronization is achieved. Can be performed in common for a plurality of antennas.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  As described above, according to the present embodiment, in a transmission method for transmitting modulated signals of a plurality of channels from a plurality of antennas in the same frequency band, the transmission method includes a control symbol in the transmission signal to be transmitted. By using the reception device using, by multiplexing the modulation signals of a plurality of channels on the same frequency, the data transmission speed can be improved and the frequency offset can be removed at the reception device.

(Embodiment 12)
In the twelfth embodiment, a modulated signal is transmitted, a communication partner receives the modulated signal, estimates the radio wave propagation environment in each antenna, transmits the estimated radio wave propagation environment information, and based on the information on the radio wave propagation environment , A transmission method for transmitting modulated signals of a plurality of channels in the same frequency band from a plurality of antennas, a communication method for selecting one of the modulation signals of a channel from a single antenna, and a radio using the communication method A communication apparatus and a modulated signal are transmitted, a communication partner receives the modulated signal, estimates a radio wave propagation environment in each antenna, and a transmission method based on the estimated radio wave propagation environment information includes a plurality of signals in the same frequency band. Request transmission method to transmit modulated signal of channel from multiple antennas, transmission method of modulated signal of one channel from one antenna Based on the request information, a transmission method for transmitting modulated signals of a plurality of channels from a plurality of antennas or a transmission method of a modulation signal for one channel from a single antenna is selected based on the request information. A communication method and a wireless communication apparatus using the communication method will be described.

  FIG. 4 shows signal point arrangement in the in-phase I-orthogonal Q plane.

  FIG. 70 is an example of a frame configuration on the time axis in the present embodiment. 7001, 7003, 7004, 7005 are channel A information symbols of the base station transmission signal, 7002 is a guard symbol of channel A of the base station transmission signal, 7007, 7009 are information symbols of channel B of the base station transmission signal, 7006, 7008 , 7010 are channel B guard symbols of the base station transmission signal, and 7011, 7012, and 7013 are information symbols of the terminal transmission signal.

  FIG. 71 shows an example of the configuration of information symbols of base station transmission signal channel A in this embodiment, where 7101 is a multiplexed information symbol and 7102 is a data symbol.

  FIG. 72 shows an example of the configuration of the information symbol of the terminal transmission signal in this embodiment, where 7201 is an electric field strength information symbol, 7202 is a transmission path distortion information symbol, 7203 is a multipath information symbol, and 7204 is an interference wave. An information symbol 7205 is a data symbol.

  FIG. 73 shows an example of the configuration of terminal information symbols in this embodiment, where 7301 is a transmission method request information symbol and 7302 is a data symbol.

  FIG. 74 shows an example of the configuration of the transmission apparatus of the base station in the present embodiment, and parts that operate in the same way as in FIG.

  The modulation signal generation unit 202 receives the transmission digital signal 7401, the multiplexed information 7402, and the frame configuration signal 210, and outputs the modulation signal 203 according to the frame configuration signal 210.

  Frame configuration signal generation section 209 receives transmission method determination information 7403 as input, and outputs frame configuration signal 210.

  Modulation signal generation section 212 receives transmission digital signal 7401 and frame configuration signal 210 as inputs, and outputs modulation signal 213.

  FIG. 75 illustrates an example of a configuration of a reception device of a base station in this embodiment. Radio section 7503 receives reception signal 7502 received by antenna 7501 and outputs reception quadrature baseband signal 7504.

  Demodulation section 7505 receives received quadrature baseband signal 7504 and outputs received digital signal 7506.

  The signal separator 7507 receives the received digital signal 7506 and outputs radio wave propagation environment estimation information, transmission method request information 7508, and received data 7509.

  The transmission method determination unit 7510 receives the radio wave propagation environment information or the transmission method request information 7508, and outputs transmission method determination information 7511 and multiplexing information 7512.

  FIG. 76 illustrates an example of a configuration of a terminal transmission device according to this embodiment. Modulated signal generation section 7606 receives transmission digital signal 7601, radio wave propagation environment estimation signals 7602 and 7603, and frame configuration signal 7605 as inputs. The transmission quadrature baseband signal 7607 is output.

  Frame configuration signal generation section 7604 outputs frame configuration signal 7605.

  Modulator 7608 receives transmission quadrature baseband signal 7607 as input, outputs modulated signal 7609, and is output as radio waves from antenna 7610.

  FIG. 77 illustrates an example of a configuration of a terminal reception device in this embodiment. A radio section 7703 receives a reception signal 7702 received by an antenna 7701 and outputs a reception quadrature baseband signal 7704.

  Multipath estimation section 7705 receives reception quadrature baseband signal 7704 and outputs multipath estimation signal 7706.

  Interference wave intensity estimation unit 7707 receives reception quadrature baseband signal 7704 and outputs interference wave intensity estimation signal 7708.

  Channel A field strength estimation section 7709 receives reception quadrature baseband signal 7704 and outputs a channel A signal field strength estimation signal 7710.

  Channel B field strength estimation section 7711 receives reception quadrature baseband signal 7704 and outputs a channel B signal field strength estimation signal 7712.

  Channel A transmission path distortion estimation section 7713 receives reception quadrature baseband signal 7704 and outputs channel A transmission path distortion estimation signal 7714.

  Channel B transmission path distortion estimation section 7715 receives reception quadrature baseband signal 7704 and outputs channel B transmission path distortion estimation signal 7716.

  The information generation unit 7717 includes a multipath estimation signal 7706, an interference signal strength estimation signal 7708, a channel A signal field strength estimation signal 7710, a channel B signal field strength estimation signal 7712, and a channel A transmission path distortion estimation signal 7714. , Channel B transmission path distortion estimation signal 7716 is input, and radio wave propagation environment estimation signal 7718 is output.

  The signal separation unit 7719 receives the reception quadrature baseband signals 7704 and 7729, the channel A transmission path distortion estimation signals 7714 and 7739, and the channel B transmission path distortion estimation signals 7716 and 7741, and receives the channel A reception quadrature baseband signals. 7720 and channel B received quadrature baseband signal 7721 are output.

  Radio section 7728 receives reception signal 7727 received by antenna 7726 and outputs reception quadrature baseband signal 7729.

  Multipath estimation section 7730 receives reception quadrature baseband signal 7729 and outputs multipath estimation signal 7731.

  Interference wave intensity estimation unit 7732 receives reception quadrature baseband signal 7729 and outputs interference wave intensity estimation signal 7733.

  Channel A field strength estimation section 7734 receives reception quadrature baseband signal 7729 and outputs a channel A signal field strength estimation signal 7735.

  Channel B field strength estimation section 7736 receives reception quadrature baseband signal 7729 and outputs a channel B signal field strength estimation signal 7737.

  Channel A transmission path distortion estimation section 7738 receives reception quadrature baseband signal 7729 and outputs channel A transmission path distortion estimation signal 7739.

  Channel B transmission path distortion estimation section 7740 receives reception quadrature baseband signal 7729 and outputs channel B transmission path distortion estimation signal 7741.

  The information generation unit 7742 includes a multipath estimation signal 7731, an interference signal strength estimation signal 7733, a channel A signal field strength estimation signal 7735, a channel B signal field strength estimation signal 7737, and a channel A transmission path distortion estimation signal 7739. , Channel B transmission path distortion estimation signal 7741 is input, and radio wave propagation environment estimation signal 7743 is output.

  FIG. 78 shows an example of the configuration of a terminal transmission apparatus according to the present embodiment, and parts that operate in the same manner as in FIG. 76 are given the same reference numerals.

  Transmission method request information generation section 7801 receives radio wave propagation environment information 7602 and 7603 and outputs transmission method request information to 7802.

  FIG. 84 illustrates an example of a frame configuration in this embodiment. The base station transmits an OFDM modulation signal, 8401 is a guard symbol of the base station transmission signal, and 8402 is a base station transmission signal. An information symbol 8403 is an information symbol of the terminal transmission signal.

  Next, the modulated signal is transmitted using FIG. 4, FIG. 70, FIG. 71, FIG. 72, FIG. 74, FIG. 75, FIG. A transmission method for estimating a propagation environment, transmitting the estimated radio wave propagation environment information, and transmitting modulation signals of a plurality of channels from a plurality of antennas in the same frequency band based on the information of the radio wave propagation environment, A communication method for selecting one of transmission methods for a modulated signal from one antenna and a wireless communication apparatus using the communication method will be described.

  FIG. 74 shows the configuration of the transmission apparatus of the base station. Frame configuration signal generation section 7403 receives transmission method determination information 7403 as an input, and, based on transmission method determination information 7403, for example, the information symbol of channel A in FIG. Either a transmission method in which 7004 and channel B information symbols are multiplexed, or a transmission method in which channel A information symbol 7005 in FIG. 70 is transmitted but channel B is guard symbol 7010 is not multiplexed. Such frame configuration information is output as a frame configuration signal 210. However, transmission method determination information 7403 corresponds to 7511 of the receiving apparatus of the base station in FIG.

  Modulation signal generation section 202 receives transmission digital signal 7401, multiplexed information 7402, and frame configuration signal 210, and outputs modulation signal 203 of an information symbol. At this time, as shown in FIG. 71, the information symbol is composed of a multiplexed information symbol 7101 and a data symbol 7102. The multiplexed information symbol 7101 is a symbol of the multiplexed information 7402, and the data symbol 7102 is a transmission digital signal 7401. However, the multiplexed information 7402 corresponds to 7512 of the receiving device of the base station in FIG.

  Modulation signal generation section 212 receives transmission digital signal 7401 and frame configuration signal 210 as inputs, and outputs a modulation signal 213 of guard symbols or information symbols according to frame configuration signal 210 as shown in FIG. At this time, the modulation signal of the guard symbol is a signal point 403 in FIG.

  FIG. 75 shows the configuration of the receiving apparatus of the base station, and the signal separation unit 7507 includes a data symbol 7205, a field strength information symbol 7201 corresponding to radio wave propagation environment information, and a transmission path distortion information symbol 7202 in the frame configuration diagram of FIG. The multipath information symbol 7203 and the interference wave information symbol 7204 are separated, and the information of the data symbol 7205 is output as received data 7509. In addition, information on the electric field intensity information symbol 7201, the transmission path distortion information symbol 7202, the multipath information symbol 7203, and the interference wave information symbol 7204 is output as the radio wave propagation environment estimation information 7508.

  Transmission method determining section 7510 receives radio wave propagation environment information 7508 as an input, and based on radio wave propagation environment information 7508, a transmission method for transmitting modulated signals of a plurality of channels from a plurality of antennas in the same frequency band, and a modulated signal of one channel A communication method for selecting one of the transmission methods from one antenna is selected, and information on the transmission method is output as transmission method determination information 7511 and multiplexing information 7512.

  FIG. 76 shows a configuration of a transmission apparatus of a terminal. A transmission digital signal 7601, radio wave propagation environment estimation signals 7602 and 7603, and a frame configuration signal 7605 are input, and the transmission digital signal 7601 is converted into data according to the frame configuration configuration of FIG. The modulated signal 7606 is output as the symbol 7205, the radio wave propagation environment estimation signals 7602 and 7603 as the electric field strength information symbol 7201, the transmission path distortion information symbol 7202, the multipath information symbol 7203, and the interference wave information symbol 7204. However, the radio wave propagation environment estimation signals 7602 and 7603 correspond to the radio wave propagation environment estimation signals 7718 and 7743 of the receiving device of the terminal in FIG.

  FIG. 77 shows the configuration of a terminal receiving apparatus. An information generation unit 7717 includes a multipath estimation signal 7706, an interference signal strength estimation signal 7708, a channel A signal field strength estimation signal 7710, and a channel B signal field strength estimation signal. 7712, channel A transmission path distortion estimation signal 7714, and channel B transmission path distortion estimation signal 7716 are input, and field strength information symbol 7201, transmission path distortion information symbol 7202, multipath information symbol 7203, interference wave information of FIG. A radio wave propagation environment estimation signal 7718 corresponding to the information of the symbol 7204 is output.

  Similarly, the information generation unit 7742 includes a multipath estimation signal 7731, an interference signal strength estimation signal 7733, a channel A signal field strength estimation signal 7735, a channel B signal field strength estimation signal 7737, and a channel A transmission path distortion estimation. Signal 7739 and channel B transmission path distortion estimation signal 7741 as inputs, and radio wave propagation corresponding to the information of electric field strength information symbol 7201, transmission path distortion information symbol 7202, multipath information symbol 7203, and interference wave information symbol 7204 in FIG. An environment estimation signal 7743 is output.

  As described above, according to the radio wave propagation environment, a transmission method for transmitting modulated signals of a plurality of channels in the same frequency band from a plurality of antennas, and a transmission method of transmitting a plurality of channels of modulated signals in the same frequency band without multiplexing. By switching, the quality of information is improved.

  However, the radio wave propagation environment estimation signals 7718 and 7743 correspond to the transmission devices 7602 and 7603 of the terminal in FIG.

  Next, the operation at the start of communication will be described. When a base station transmits a modulated signal by a transmission method in which a base station transmits modulated signals of a plurality of channels from a plurality of antennas to the same frequency band at the start of communication, the terminal, for example, has a poor radio wave propagation situation, When the modulation signal is not suitable for the transmission method of transmitting the modulation signal from the plurality of antennas, the base station transmits the modulation signal by the transmission method of transmitting the modulation signals of the plurality of channels from the plurality of antennas in the same frequency band. The quality of received data will deteriorate.

  Therefore, the base station transmission signal does not multiplex modulation signals of a plurality of channels in the same frequency band as in the time of symbols 7001 and 7006 and the time of symbols 7002 and 7007 in FIG. Send.

  74 does not multiplex modulation signals of a plurality of channels in the same frequency band as in the time of symbols 7001 and 7006 and the time of symbols 7002 and 7007 in FIG. 70 at the start of communication with the terminal. The frame configuration at that time is output as a frame configuration signal 210.

  Terminal receiving apparatus FIG. 77 estimates a radio wave propagation environment from reception signals of base station transmission signal symbols 7001 and 7007 in FIG. 74, and generates radio wave propagation environment estimation signals 7718 and 7743.

  Terminal transmission apparatus FIG. 76 transmits radio wave propagation environment estimation signals 7718 and 7743 obtained by estimating the radio wave propagation environment from the received signals of base station transmission signal symbols 7001 and 7007 using information symbols 7011 and 7012 in FIG.

  FIG. 75 shows a reception apparatus for a base station. FIG. 75 shows a radio wave propagation environment estimation information included in an information symbol 7011 among transmission signals transmitted by a terminal transmission apparatus FIG. The transmission method for transmitting from the same frequency band, and the transmission method for transmitting modulation signals of a plurality of channels without multiplexing in the same frequency band. For example, if the radio wave propagation environment is good, the same information symbols 7004 and 7009 are used. Modulated signals of a plurality of channels are transmitted from a plurality of antennas in the frequency band.

  As described above, when communication with a terminal is started, the quality of information is improved by transmitting modulation signals of a plurality of channels in the same frequency band without multiplexing.

  However, in the above description, a modulation signal for requesting that the terminal wants to communicate with the base station may be transmitted first.

  It can also be implemented in the same way when the base station transmission method is OFDM.

  Next, the modulated signal is transmitted using FIG. 4, FIG. 70, FIG. 71, FIG. 73, FIG. 74, FIG. 75, FIG. Estimating the propagation environment, and as a transmission method based on the estimated radio wave propagation environment information, a transmission method of transmitting modulated signals of multiple channels in the same frequency band from multiple antennas, a modulated signal of one channel from one antenna A transmission method for transmitting information requesting one of the transmission methods, and transmitting modulated signals of a plurality of channels from a plurality of antennas in the same frequency band based on the request information, a modulation signal of one channel being transmitted by one antenna A communication method for selecting one of the transmission methods from the above and a wireless communication apparatus using the method will be described.

  FIG. 74 shows the configuration of the transmission apparatus of the base station. Frame configuration signal generation section 7403 receives transmission method determination information 7403 as an input, and, based on transmission method determination information 7403, for example, the information symbol of channel A in FIG. Either a transmission method in which 7004 and channel B information symbols are multiplexed, or a transmission method in which channel A information symbol 7005 in FIG. 70 is transmitted but channel B is guard symbol 7010 is not multiplexed. Such frame configuration information is output as a frame configuration signal 210. However, transmission method determination information 7403 corresponds to 7511 of the receiving apparatus of the base station in FIG.

  Modulation signal generation section 202 receives transmission digital signal 7401, multiplexed information 7402, and frame configuration signal 210, and outputs modulation signal 203 of an information symbol. At this time, as shown in FIG. 71, the information symbol is composed of a multiplexed information symbol 7101 and a data symbol 7102, the multiplexed information symbol 7101 is a symbol of the multiplexed information 7402, and the data symbol 7102 is a transmission digital signal 7401. However, the multiplexed information 7402 corresponds to 7512 of the receiving device of the base station in FIG.

  Modulation signal generation section 212 receives transmission digital signal 7401 and frame configuration signal 210 as inputs, and outputs a modulation signal 213 of guard symbols or information symbols according to frame configuration signal 210 as shown in FIG. At this time, the modulation signal of the guard symbol is a signal point 403 in FIG.

  FIG. 75 shows the configuration of the receiving apparatus of the base station. In the frame configuration diagram of FIG. 73, the signal separator 7507 separates the data symbol 7302 and the transmission method request information 7301 and converts the information of the data symbol 7205 into the received data 7509. Also, the transmission method request information symbol 7301 is output as transmission method request information 7508.

  A transmission method determination unit 7510 receives transmission method request information 7508 as an input, transmits a modulated signal of a plurality of channels from a plurality of antennas in the same frequency band, and transmits a modulation signal of one channel from a single antenna. A communication method to be selected is selected, and information on the transmission method is output as transmission method determination information 7511 and multiplexing information 7512.

  FIG. 78 shows the configuration of the transmission apparatus of the terminal, and the transmission method request information generation unit 7801 receives the radio wave propagation environment estimation signals 7602 and 7603 as input, for example, according to the radio wave propagation environment estimation signals 7602 and 7603. If it is good, send a transmission method that transmits modulation signals of multiple channels from multiple antennas in the same frequency band. If bad, send a communication method that selects one of the modulation signals of one channel from one antenna. Output as request information 7802.

  Modulation signal generation section 7606 receives transmission digital signal 7601, frame configuration signal 7605, and transmission request information 7802 as input, and transmits transmission digital signal 7601 and transmission request information 7802 according to the frame configuration of FIG. 73 output from frame configuration signal 7605. Modulate and output a transmit quadrature baseband signal 7607.

  However, the radio wave propagation environment estimation signals 7602 and 7603 correspond to the radio wave propagation environment estimation signals 7718 and 7743 of the receiving device of the terminal in FIG.

  FIG. 77 shows the configuration of a terminal receiving apparatus. An information generation unit 7717 includes a multipath estimation signal 7706, an interference signal strength estimation signal 7708, a channel A signal field strength estimation signal 7710, and a channel B signal field strength estimation signal. 7712, channel A transmission path distortion estimation signal 7714 and channel B transmission path distortion estimation signal 7716 are input, and radio wave propagation environment estimation signal 7718 is output.

  Similarly, the information generation unit 7742 includes a multipath estimation signal 7731, an interference signal strength estimation signal 7733, a channel A signal field strength estimation signal 7735, a channel B signal field strength estimation signal 7737, and a channel A transmission path distortion estimation. Signal 7739 and channel B transmission path distortion estimation signal 7741 are input, and radio wave propagation environment estimation signal 7743 is output.

  However, the radio wave propagation environment estimation signals 7718 and 7743 correspond to the transmission devices 7602 and 7603 of the terminal in FIG.

  As described above, according to the radio wave propagation environment, a transmission method for transmitting modulated signals of a plurality of channels in the same frequency band from a plurality of antennas, and a transmission method of transmitting a plurality of channels of modulated signals in the same frequency band without multiplexing. By switching, the quality of information is improved.

  Next, the operation at the start of communication will be described. When a base station transmits a modulated signal by a transmission method in which a base station transmits modulated signals of a plurality of channels from a plurality of antennas to the same frequency band at the start of communication, the terminal, for example, has a poor radio wave propagation situation, and a plurality of channels in the same frequency band. When the base station transmits a modulated signal using a transmission method in which multiple channels of modulated signals are transmitted from multiple antennas when the modulated signal is not suitable for a transmission method of transmitting multiple modulated signals from multiple antennas, the received data Quality will deteriorate.

  Therefore, the base station transmission signal does not multiplex modulation signals of a plurality of channels in the same frequency band as in the time of symbols 7001 and 7006 and the time of symbols 7002 and 7007 in FIG. Send.

  74 does not multiplex modulation signals of a plurality of channels in the same frequency band as in the time of symbols 7001 and 7006 and the time of symbols 7002 and 7007 in FIG. 70 at the start of communication with the terminal. The frame configuration at that time is output as a frame configuration signal 210.

  Terminal receiving apparatus FIG. 77 estimates a radio wave propagation environment from reception signals of base station transmission signal symbols 7001 and 7007 in FIG. 74, and generates radio wave propagation environment estimation signals 7718 and 7743.

  Terminal transmission apparatus Transmission method request information generation section 7801 in FIG. 78 receives radio wave propagation environment estimation signals 7718 and 7743, which are radio wave propagation environment estimation signals estimated from the received signals of base station transmission signal symbols 7001 and 7007, and is the same. A transmission method for transmitting modulation signals of a plurality of channels in a frequency band from a plurality of antennas or a transmission method of transmitting modulation signals of a plurality of channels in the same frequency band without multiplexing are determined. For example, this information is transmitted in the information symbol 7011 of FIG. 70 in the configuration of the information symbol of the transmission signal of FIG.

  FIG. 75 of the base station receiving apparatus shows a plurality of antennas for modulating signals of a plurality of channels in the same frequency band from the transmission method request information symbols included in the information symbol 7011 among the transmission signals transmitted by the terminal transmitting apparatus FIG. The modulation signal is transmitted by any one of a transmission method of transmitting from the transmission method and a transmission method of transmitting without multiplexing the modulation signals of a plurality of channels in the same frequency band.

  As described above, when communication with a terminal is started, the quality of information is improved by transmitting modulation signals of a plurality of channels in the same frequency band without multiplexing.

  However, in the above description, a modulation signal for requesting that the terminal wants to communicate with the base station may be transmitted first.

  In this embodiment, it is possible to implement any of a single carrier scheme, a spread spectrum communication scheme, and a CDMA scheme that is a multiplexing scheme. In this case, a transmission unit requires a spreading unit and a receiving unit requires a despreading unit. It becomes.

  In particular, the case of the OFDM method will be described. FIG. 84 is an example of a frame configuration when the transmission method of the base station is the OFDM method. The transmitter of the base station transmits a modulated signal of channel A at time 0, and transmits a modulated signal of channel B at time 1. At this time, the terminal receives the modulation signal transmitted by the base station at time 0 and the modulation signal transmitted by the base station at time 1, and receives the radio wave propagation environment, for example, multipath, jamming field strength, channel A field strength. Estimate channel B field strength, channel A transmission path distortion, channel B transmission path distortion, and transmit radio wave propagation environment estimation information or modulation signals of multiple channels in the same frequency band from multiple antennas. A transmission request information requesting any one of a transmission method and a transmission method for transmitting a modulation signal of a plurality of channels without multiplexing in the same frequency band, and the base station transmits the radio wave propagation environment estimation information or The transmission method is determined from the transmission request information. For example, when the radio wave propagation environment is good, channel A and channel B are multiplexed and transmitted at time 3 and time 4 in FIG. If the environment is bad, only the modulated signal of channel A is transmitted as time 5 in Fig. 84. The transmitting device and receiving device of the base station and terminal at this time can be configured as shown in FIGS. 74, 75, 76, 77, and 78 described in the frame configuration of FIG. In addition, the present invention can be similarly applied to a method in which a modulated signal is generated from the signal of the spread spectrum communication method by the OFDM method.

  The number of channels multiplexed in the same frequency band has been described for switching between 2 channels and 1 channel. However, the present invention is not limited to this. For example, when 3 channels can be multiplexed in the same frequency band, The multiplexing number is switched between 1 to 3 channels.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  As described above, the modulated signal is transmitted, the communication partner receives the modulated signal, estimates the radio wave propagation environment in each antenna, transmits the estimated radio wave propagation environment information, and is the same based on the radio wave propagation environment information. Transmission method for transmitting modulation signals of a plurality of channels in a frequency band from a plurality of antennas, communication method for selecting one of transmission methods for a modulation signal of one channel from one antenna, and a radio communication apparatus using the communication method Thus, a transmission method for transmitting modulated signals of a plurality of channels from a plurality of antennas in the same frequency band and a transmission method of a modulated signal of one channel from a single antenna depending on the radio wave propagation environment. By switching, it becomes possible to transmit information more accurately.

(Embodiment 13)
In the thirteenth embodiment, a plurality of spread spectrum communication modulation signals can be transmitted, a modulation signal of a transmission method that transmits a control channel is transmitted, and the communication partner receives the modulation signal. The radio wave propagation environment is estimated from the received signal of the control channel, information on the estimated radio wave propagation environment is transmitted, and based on the radio wave propagation environment information, a plurality of spread spectrum communication system data channel modulation signals are transmitted in the same frequency band. A transmission method for transmitting from a plurality of antennas, a communication method for selecting one of transmission methods for transmitting a modulated signal of a data channel of one spread spectrum communication method from one antenna, a wireless communication apparatus using the communication method, And a modulation signal of a transmission method capable of transmitting a modulation signal of a plurality of spread spectrum communication systems and transmitting a control channel Transmitting, the other party receives the modulated signal, estimates the radio wave propagation environment at each antenna from the received signal of the control channel, and uses the information on the estimated radio wave propagation environment, data of a plurality of spread spectrum communication systems in the same frequency band A transmission method for transmitting a modulation signal of a channel from a plurality of antennas, and a transmission method for transmitting a modulation signal of a data channel of one spread spectrum communication method from one antenna. A transmission method for transmitting modulated signals of a plurality of spread spectrum communication data channels from a plurality of antennas in the same frequency band based on request information, and transmitting a modulated signal of a data channel of a spread spectrum communication system from one antenna A communication method for selecting one of the transmission methods to be used, and no communication method using the communication method. The communication apparatus.

  FIG. 4 shows signal point arrangement in the in-phase I-orthogonal Q plane.

  FIG. 72 shows an example of a configuration of information symbols of a terminal transmission signal in the present embodiment.

  FIG. 73 illustrates an example of a configuration of the information symbol of the terminal in the present embodiment.

  FIG. 75 illustrates an example of a configuration of a reception device of the base station in the present embodiment.

  FIG. 76 illustrates an example of a configuration of a terminal transmission device according to the present embodiment.

  FIG. 78 illustrates an example of a configuration of a terminal transmission device according to the present embodiment.

  FIG. 79 shows an example of a frame configuration on the time axis in the present embodiment. Reference numerals 7901 and 7902 are information symbols of the base station transmission signal spread spectrum communication system A, and 7903, 7904, 7905 and 7906 are control symbols of the base station transmission signal spread spectrum communication system A.

  Reference numeral 7907 denotes an information symbol of the base station transmission signal spread spectrum communication system B, 7908 denotes a guard symbol, and 7909, 7910, 7911, and 7912 denote control symbols of the base station transmission signal spread spectrum communication system B.

  Reference numerals 7913, 7914, and 7915 denote information symbols of the terminal transmission signal.

  FIG. 80 shows an example of the configuration of the transmission apparatus of the base station in the present embodiment, and parts that operate in the same way as in FIG.

  Data channel modulation / spreading section 8002 receives transmission digital signal 8001 and frame configuration signal 210 as input, and outputs a transmission quadrature baseband signal 8003 of a data channel of spread spectrum communication system A.

  Control channel modulation / spreading section 8006 receives transmission method decision information 8005 and frame configuration signal 210 as inputs, and outputs a transmission orthogonal baseband signal 8010 for a control channel of spread spectrum communication system A.

  An adder 8004 receives the transmission quadrature baseband signal 8003 of the spread spectrum communication system A data channel and the transmission quadrature baseband signal 8010 of the control channel of the spread spectrum communication system A as input, and adds together. The transmitted orthogonal baseband signal 203 is output.

  Data channel modulation and spreading section 8009 receives transmission digital signal 8008 and frame configuration signal 210 as inputs, and outputs a transmission quadrature baseband signal 8010 of a spread spectrum communication system B data channel.

  Control channel modulation and spreading section 8012 receives transmission method decision information 8005 and frame configuration signal 210 as inputs, and outputs a transmission orthogonal baseband signal 8013 of the control channel of spread spectrum communication system B.

  The adder 8011 receives the transmission quadrature baseband signal 8010 of the spread spectrum communication system B data channel and the transmission quadrature baseband signal 8013 of the control channel of the spread spectrum communication system B as input, adds them, and adds the spread spectrum communication system B The transmitted orthogonal baseband signal 213 is output.

  Frame configuration signal generation section 209 receives transmission method determination information 8005 as input, and outputs frame configuration signal 210.

  FIG. 81 shows an example of the configuration of control symbols 7903, 7904, 7905, 7906, 7909, 7910, 7911, and 7912 of FIG. 79, where 8101 is multiplexed information, 8102 is pilot symbols, and 8103 is transmission power control information. is there.

  FIG. 82 shows an example of the configuration of the receiving device of the terminal according to the present embodiment, and parts that operate in the same manner as in FIG. 77 are given the same reference numerals.

  The spread spectrum communication system A field strength estimation unit 8201 receives the received quadrature baseband signal 7704 and outputs a spread spectrum communication system A signal field strength estimation signal 8202.

  Spread spectrum communication system B field strength estimation section 8203 receives reception quadrature baseband signal 7704 and outputs a spread spectrum communication system B field strength estimation signal 8204.

  A spread channel communication method A transmission path distortion estimation unit 8205 receives the received orthogonal baseband signal 7704 and outputs a spread spectrum communication system A transmission path distortion estimation signal 8206.

  Spread spectrum communication system B transmission path distortion estimation section 8207 receives reception quadrature baseband signal 7704 and outputs spread spectrum communication system B transmission path distortion estimation signal 8208.

  The information generation unit 7717 includes a multipath estimation signal 7706, an interference signal strength estimation signal 7708, a signal intensity estimation signal 8202 of a spread spectrum communication method A signal, a field strength estimation signal 8204 of a spread spectrum communication method B signal, and spread spectrum communication. System A transmission path distortion estimation signal 8206 and spread spectrum communication system B transmission path distortion estimation signal 8208 are input, and radio wave propagation environment estimation signal 7718 is output.

  Spread spectrum communication system A field strength estimation section 8209 receives reception quadrature baseband signal 7729 and outputs a spread spectrum communication system A signal field strength estimation signal 8210.

  The spread spectrum communication system B field strength estimation unit 8211 receives the received quadrature baseband signal 7729 and outputs a spread spectrum communication system B signal field strength estimation signal 8212.

  The spread channel communication system A transmission path distortion estimation unit 8213 receives the received orthogonal baseband signal 7729 and outputs a spread spectrum communication system A transmission path distortion estimation signal 8214.

  The spread spectrum communication system B transmission path distortion estimation unit 8215 receives the received orthogonal baseband signal 7729 and outputs a spread spectrum communication system B transmission path distortion estimation signal 8216.

  The information generation unit 7742 includes a multipath estimation signal 7731, an interference signal strength estimation signal 7733, a spread spectrum communication system A signal field strength estimation signal 8210, a spread spectrum communication system B signal field strength estimation signal 8212, and spread spectrum communication. System A transmission path distortion estimation signal 8214 and spread spectrum communication system B transmission path distortion estimation signal 8216 are input, and radio wave propagation environment estimation signal 7743 is output.

  FIG. 83 shows an example of a frame configuration in the present embodiment.

  FIG. 85 shows an example of the configuration of control symbols when the base station in this embodiment transmits and transmits a spread spectrum communication system signal using the OFDM system. Reference numerals 8501, 8502, 8503, and 8504 denote control symbols, Control symbols are configured on the time axis.

  FIG. 86 shows an example of the configuration of control symbols when the base station in the present embodiment transmits and transmits a signal of the spread spectrum communication scheme by the OFDM scheme, and 8601, 8602, 8603, and 8604 are control symbols. Control symbols are configured on the frequency axis.

  Next, by using FIG. 4, FIG. 72, FIG. 75, FIG. 76, FIG. 79, FIG. 80, FIG. 81, and FIG. Transmitting a modulated signal of a transmission method, receiving a modulated signal, estimating a radio wave propagation environment in each antenna from a received signal of a control channel, transmitting information on the estimated radio wave propagation environment, Based on propagation environment information, a transmission method for transmitting a plurality of spread spectrum communication system data channel modulation signals to the same frequency band from a plurality of antennas, a single spread spectrum communication system data channel modulation signal from a single antenna A communication method for selecting one of transmission methods to be transmitted and a wireless communication apparatus using the communication method will be described.

  FIG. 80 shows the configuration of the transmission apparatus of the base station. Frame configuration signal generation section 209 receives transmission method decision information 8005 as an input, and based on transmission method decision information 8005, for example, spread spectrum communication method A in FIG. Information symbol 7901 and information symbol 7907 of spread spectrum communication system B are multiplexed, or information symbol 7902 of spread spectrum communication system A in FIG. 79 is transmitted, but spread spectrum communication system B is guarded Any frame configuration information of a non-multiplexed transmission method such as symbol 7908 is output as a frame configuration signal 210. However, the transmission information determination information 8005 corresponds to the receiving device 7511 of the base station in FIG.

  Data channel modulation / spreading section 8002 receives transmission digital signal 8001 and frame configuration signal 210 as inputs, and outputs a transmission quadrature baseband signal 8003 of spread spectrum communication system A.

  Data channel modulation / spreading section 8009 receives transmission digital signal 8008 and frame configuration signal 210 as input, and, as shown in FIG. A baseband signal 8010 is output. At this time, the modulation signal of the guard symbol is a signal point 403 in FIG.

  Control channel modulation / spreading section 8006 receives transmission method decision information 8005 as an input, and for example, as shown in FIG. 81, control channel information for control of multiplexed information 8101, pilot symbol 8102, transmission power control information 8103, and the like. A transmission quadrature baseband signal 8007 is output.

  Similarly, control channel modulation / spreading section 8012 receives transmission method decision information 8005 as input, and, for example, as shown in FIG. 81, information for control such as multiplexed information 8101, pilot symbol 8102, transmission power control information 8103, and the like. A transmission orthogonal baseband signal 8013 of the control channel is output.

  Here, multiplexing information 8101 in FIG. 81 is a symbol for notifying the terminal of either a transmission method for multiplexing spread spectrum communication method A and spread spectrum communication method B or a method for transmitting only spread spectrum communication method A. It is.

  FIG. 75 shows the configuration of the receiving apparatus of the base station, and the signal separation unit 7507 includes a data symbol 7205, a field strength information symbol 7201 corresponding to radio wave propagation environment information, and a transmission path distortion information symbol 7202 in the frame configuration diagram of FIG. The multipath information symbol 7203 and the interference wave information symbol 7204 are separated, and the information of the data symbol 7205 is output as received data 7509. In addition, information on the electric field intensity information symbol 7201, the transmission path distortion information symbol 7202, the multipath information symbol 7203, and the interference wave information symbol 7204 is output as the radio wave propagation environment estimation information 7508.

  Transmission method determining unit 7510 receives radio wave propagation environment information 7508 as an input, and based on the radio wave propagation environment information 7508, a transmission method for transmitting modulated signals of a plurality of spread spectrum communication data channels from a plurality of antennas in the same frequency band, One of the transmission methods for transmitting a modulated signal of a data channel of one spread spectrum communication system from one antenna is selected, and information on the transmission method is output as transmission method determination information 7511 and multiplexing information 7512.

  FIG. 76 shows the configuration of the transmission apparatus of the terminal. The transmission digital signal 7601, the radio wave propagation environment estimation signals 7602 and 7603, and the frame configuration signal 7604 are input, and the transmission digital signal 7601 is converted into data according to the frame configuration configuration of FIG. The modulated signal 7606 is output as the symbol 7205, the radio wave propagation environment estimation signals 7602 and 7603 as the electric field strength information symbol 7201, the transmission path distortion information symbol 7202, the multipath information symbol 7203, and the interference wave information symbol 7204. However, the radio wave propagation environment estimation signals 7602 and 7603 correspond to the radio wave propagation environment estimation signals 7718 and 7743 of the receiving device of the terminal in FIG.

  FIG. 82 shows the configuration of the receiving device of the terminal. The field intensity estimation unit 8201 of the spread spectrum communication method A receives the received quadrature baseband signal 7704 as an input, and the spread spectrum of FIG. The electric field strength is estimated from the component of the control channel of the communication method A, and the electric field strength signal 8202 of the signal of the spread spectrum communication method A is output.

  Spread spectrum communication system B field strength estimation section 8203 receives reception quadrature baseband signal 7704 as input, and for example, determines the field strength from the control channel component of spread spectrum communication system B in FIG. And an electric field strength estimation signal 8204 of the signal of the spread spectrum communication system B is output.

  The spread channel communication system A transmission path distortion estimation unit 8205 receives the received orthogonal baseband signal 7704, estimates the transmission path distortion from the control channel component of the spread spectrum communication system A of FIG. A transmission path distortion estimation signal 8206 of method A is output.

  Spread channel communication system B transmission path distortion estimation section 8207 receives reception quadrature baseband signal 7704, estimates the transmission path distortion from the components of the control channel of spread spectrum communication system B in FIG. 79, for example, and performs spread spectrum communication. A transmission path distortion estimation signal 8208 of method B is output.

  The information generation unit 7717 includes a multipath estimation signal 7706, an interference signal strength estimation signal 7708, a signal intensity estimation signal 8202 of a spread spectrum communication method A signal, a field strength estimation signal 8204 of a spread spectrum communication method B signal, and spread spectrum communication. System A transmission path distortion estimation signal 8206 and spread spectrum communication system B transmission path distortion estimation signal 8208 are input, and field strength information symbol 7201, transmission path distortion information symbol 7202, multipath information symbol 7203, interference wave in FIG. A radio wave propagation environment estimation signal 7718 corresponding to the information of information symbol 7204 is output.

  The spread spectrum communication system A field strength estimation unit 8209 receives the received quadrature baseband signal 7729 as an input, and determines the field strength from the control channel component of the spread spectrum communication system A of FIG. And an electric field strength estimation signal 8210 of the signal of the spread spectrum communication system A is output.

  The spread spectrum communication system B field strength estimation unit 8211 receives the received quadrature baseband signal 7729, and determines the field strength from the control channel component of the spread spectrum communication system B of FIG. And an electric field strength estimation signal 8212 of the signal of the spread spectrum communication system B is output.

  The transmission path distortion estimation unit 8213 of the spread spectrum communication system A receives the received quadrature baseband signal 7729, receives the received quadrature baseband signal 7729, and, for example, spread spectrum communication of FIG. Transmission path distortion is estimated from the component of the control channel of system A, and a transmission path distortion estimation signal 8214 of spread spectrum communication system A is output.

  The transmission path distortion estimation unit 8215 of the spread spectrum communication system B receives the received orthogonal baseband signal 7729 as an input, and transmits, for example, from the control channel component of the spread spectrum communication system B of FIG. 79 in the received orthogonal baseband signal 7729. The path distortion is estimated and a transmission path distortion estimation signal 8216 of spread spectrum communication system B is output.

  The information generation unit 7742 includes a multipath estimation signal 7731, an interference signal strength estimation signal 7733, a spread spectrum communication system A signal field strength estimation signal 8210, a spread spectrum communication system B signal field strength estimation signal 8212, and spread spectrum communication. System A transmission path distortion estimation signal 8214 and spread spectrum communication system B transmission path distortion estimation signal 8216 are input, and field strength information symbol 7201, transmission path distortion information symbol 7202, multipath information symbol 7203, interference wave in FIG. A radio wave propagation environment estimation signal 7743 corresponding to the information of information symbol 7204 is output.

  As described above, a transmission method for transmitting a plurality of spread spectrum communication system data channel modulation signals from a plurality of antennas in the same frequency band, and a transmission method for transmitting a single spread spectrum communication system data channel modulation signal from one antenna. By switching, the quality of information is improved.

  However, the radio wave propagation environment estimation signals 7718 and 7743 correspond to the transmission devices 7602 and 7603 of the terminal in FIG.

  Next, the operation at the start of communication will be described. When a base station transmits a modulated signal by a transmission method in which a base station transmits modulated signals of a plurality of spread spectrum communication data channels from a plurality of antennas in the same frequency band at the start of communication, the terminal has the same radio wave propagation status, for example, and the same When the base station is not suitable for a transmission method in which modulated signals of multiple channels are transmitted from multiple antennas in the frequency band, the base station transmits modulated signals of data channels of multiple spread spectrum communication systems from multiple antennas in the same frequency band. If the modulated signal is transmitted by the transmission method, the quality of the received data is deteriorated.

  Therefore, at the start of communication with the terminal, the base station transmission signal is, for example, spread spectrum communication method A so that the information symbol of spread spectrum communication method A and the information symbol of spread spectrum communication method B in FIG. A plurality of spread spectrum communication systems in the same frequency band, such as the time of control symbol 7903 and control symbol 7909 of spread spectrum communication system B, the time of control symbol 7904 of spread spectrum communication system A and the control symbol 7913 of spread spectrum communication system B No data channel exists.

  The frame configuration signal generation unit 209 in FIG. 80 performs the time of the control symbol 7903 of the spread spectrum communication A and the control symbol 7909 of the spread spectrum communication system B in FIG. 79 and the control symbol 7904 of the spread spectrum communication system A at the start of communication with the terminal. And a setting such that a plurality of spread spectrum communication system data channels do not exist in the same frequency band, such as the time of control symbol 7913 of spread spectrum communication system B, and the frame configuration at that time is output as frame configuration signal 210 To do.

  FIG. 82 shows a base station transmission signal control symbol 7903, spread spectrum communication system B control symbol 7909, spread spectrum communication system A control symbol 7904, and spread spectrum communication system B of the base station transmission signal of FIG. The radio wave propagation environment is estimated from the received signal of the control symbol 7913, and radio wave propagation environment estimation signals 7718 and 7743 are generated.

  FIG. 76 shows the transmission symbol of the base station, the control symbol 7903 of the spread spectrum communication A, the control symbol 7909 of the spread spectrum communication system B, the control symbol 7904 of the spread spectrum communication system A, and the control symbol of the spread spectrum communication system B Radio wave propagation environment estimation signals 7718 and 7743 obtained by estimating the radio wave propagation environment from the received signal 7913 are transmitted by information symbols 7913 and 7914 in FIG.

  The base station receiving apparatus FIG. 75 shows a plurality of spread spectrum communication system data channels in the same frequency band from the radio wave propagation environment estimation information included in the information symbol 7913 among the transmission signals transmitted by the terminal transmitting apparatus FIG. Decide either the transmission method for transmitting modulated signals from multiple antennas or the transmission method for transmitting modulated signals for one spread spectrum communication system data channel from one antenna. For example, if the radio wave propagation environment is good, As in symbols 7901 and 7907, modulated signals of a transmission method for transmitting modulated signals of a plurality of spread spectrum communication data channels from a plurality of antennas in the same frequency band are transmitted from the plurality of antennas.

  As described above, at the start of communication with the terminal, the quality of information is improved by setting such that a plurality of spread spectrum communication system data channels do not exist in the same frequency band.

  However, in the above description, a modulation signal for requesting that the terminal wants to communicate with the base station may be transmitted first.

  Next, using FIG. 4, FIG. 73, FIG. 75, FIG. 78, FIG. 79, FIG. 80, FIG. The other party receives the modulated signal, estimates the radio wave propagation environment in each antenna from the received signal of the control channel, and uses the estimated radio wave propagation environment information to the same frequency band. A transmission method for transmitting a plurality of spread spectrum communication system data channel modulation signals from a plurality of antennas, or a transmission method for transmitting a single spread spectrum communication system data channel modulation signal from a single antenna. The requested information is transmitted, and based on the requested information, modulated signals of a plurality of spread spectrum communication data channels are transmitted to a plurality of antennas in the same frequency band. A transmission method for transmitting data, a communication method for selecting one of the transmission methods for transmitting a modulated signal of a data channel of one spread spectrum communication method from one antenna, and a wireless communication apparatus using the communication method To do.

  FIG. 80 shows the configuration of the transmission apparatus of the base station. Frame configuration signal generation section 209 receives transmission method decision information 8005 as an input, and based on transmission method decision information 8005, for example, spread spectrum communication method A in FIG. Information symbol 7901 and information symbol 7907 of spread spectrum communication system B are multiplexed, or information symbol 7902 of spread spectrum communication system A in FIG. 79 is transmitted, but spread spectrum communication system B is guarded Any frame configuration information of a non-multiplexed transmission method such as symbol 7908 is output as a frame configuration signal 210. However, the transmission information determination information 8005 corresponds to the receiving device 7511 of the base station in FIG.

  Data channel modulation / spreading section 8002 receives transmission digital signal 8001 and frame configuration signal 210 as inputs, and outputs a transmission quadrature baseband signal 8003 of spread spectrum communication system A.

  Data channel modulation / spreading section 8009 receives transmission digital signal 8008 and frame configuration signal 210 as input, and, as shown in FIG. A baseband signal 8010 is output. At this time, the modulation signal of the guard symbol is a signal point 403 in FIG.

  Control channel modulation / spreading section 8006 receives transmission method decision information 8005 as an input, and for example, as shown in FIG. 81, control channel information for control of multiplexed information 8101, pilot symbol 8102, transmission power control information 8103, and the like. A transmission quadrature baseband signal 8007 is output.

  Similarly, control channel modulation / spreading section 8012 receives transmission method decision information 8005 as input, and, for example, as shown in FIG. 81, information for control such as multiplexed information 8101, pilot symbol 8102, transmission power control information 8103, and the like. A transmission orthogonal baseband signal 8013 of the control channel is output.

  Here, multiplexing information 8101 in FIG. 81 is a symbol for notifying the terminal of either a transmission method for multiplexing spread spectrum communication method A and spread spectrum communication method B or a method for transmitting only spread spectrum communication method A. It is.

  FIG. 75 shows the configuration of the receiving apparatus of the base station. The signal separator 7507 separates the data symbol 7302 and the transmission method request information symbol 7301 in the frame configuration diagram of FIG. 7509 is output. Also, information of transmission method request information symbol 7301 is output as transmission request information 7508.

  A transmission method determination unit 7510 receives transmission request information 7508 as an input, and based on the transmission request information 7508, a transmission method for transmitting modulated signals of a plurality of spread spectrum communication data channels from a plurality of antennas in the same frequency band, One of the transmission methods for transmitting the modulated signal of the data channel of the spread spectrum communication system from one antenna is selected, and information on the transmission method is output as transmission method determination information 7511 and multiplexing information 7512.

  FIG. 78 shows the configuration of the transmission device of the terminal. Transmission method request information generation section 7801 receives radio wave propagation environment estimation signals 7602 and 7603 and outputs transmission request information 7802. Modulation signal generation unit 7606 receives transmission digital signal 7601, transmission request information 7802, and frame configuration signal 7605, and outputs modulation signal 7607 according to the frame configuration of FIG. However, the radio wave propagation environment estimation signals 7602 and 7603 correspond to the radio wave propagation environment estimation signals 7718 and 7743 of the receiving device of the terminal in FIG.

  FIG. 82 shows the configuration of the receiving device of the terminal. The field intensity estimation unit 8201 of the spread spectrum communication method A receives the received quadrature baseband signal 7704 as an input, and the spread spectrum of FIG. The electric field strength is estimated from the component of the control channel of the communication method A, and the electric field strength signal 8202 of the signal of the spread spectrum communication method A is output.

  Spread spectrum communication system B field strength estimation section 8203 receives reception quadrature baseband signal 7704 as input, and for example, determines the field strength from the control channel component of spread spectrum communication system B in FIG. And an electric field strength estimation signal 8204 of the signal of the spread spectrum communication system B is output.

  The spread channel communication system A transmission path distortion estimation unit 8205 receives the received orthogonal baseband signal 7704, estimates the transmission path distortion from the control channel component of the spread spectrum communication system A of FIG. A transmission path distortion estimation signal 8206 of method A is output.

  Spread channel communication system B transmission path distortion estimation section 8207 receives reception quadrature baseband signal 7704, estimates the transmission path distortion from the components of the control channel of spread spectrum communication system B in FIG. 79, for example, and performs spread spectrum communication. A transmission path distortion estimation signal 8208 of method B is output.

  The information generation unit 7717 includes a multipath estimation signal 7706, an interference signal strength estimation signal 7708, a signal intensity estimation signal 8202 of a spread spectrum communication method A signal, a field strength estimation signal 8204 of a spread spectrum communication method B signal, and spread spectrum communication. System A transmission path distortion estimation signal 8206 and spread spectrum communication system B transmission path distortion estimation signal 8208 are input, and field strength information symbol 7201, transmission path distortion information symbol 7202, multipath information symbol 7203, interference wave in FIG. A radio wave propagation environment estimation signal 7718 corresponding to the information of information symbol 7204 is output.

  The spread spectrum communication system A field strength estimation unit 8209 receives the received quadrature baseband signal 7729 as an input, and determines the field strength from the control channel component of the spread spectrum communication system A of FIG. And an electric field strength estimation signal 8210 of the signal of the spread spectrum communication system A is output.

  The spread spectrum communication system B field strength estimation unit 8211 receives the received quadrature baseband signal 7729, and determines the field strength from the control channel component of the spread spectrum communication system B of FIG. And an electric field strength estimation signal 8212 of the signal of the spread spectrum communication system B is output.

  The transmission path distortion estimation unit 8213 of the spread spectrum communication system A receives the received quadrature baseband signal 7729, receives the received quadrature baseband signal 7729, and, for example, spread spectrum communication of FIG. Transmission path distortion is estimated from the component of the control channel of system A, and a transmission path distortion estimation signal 8214 of spread spectrum communication system A is output.

  The transmission path distortion estimation unit 8215 of the spread spectrum communication system B receives the received orthogonal baseband signal 7729 as an input, and transmits, for example, from the control channel component of the spread spectrum communication system B of FIG. 79 in the received orthogonal baseband signal 7729. The path distortion is estimated and a transmission path distortion estimation signal 8216 of spread spectrum communication system B is output.

  The information generation unit 7742 includes a multipath estimation signal 7731, an interference signal strength estimation signal 7733, a spread spectrum communication system A signal field strength estimation signal 8210, a spread spectrum communication system B signal field strength estimation signal 8212, and spread spectrum communication. System A transmission path distortion estimation signal 8214 and spread spectrum communication system B transmission path distortion estimation signal 8216 are input, and field strength information symbol 7201, transmission path distortion information symbol 7202, multipath information symbol 7203, interference wave in FIG. A radio wave propagation environment estimation signal 7743 corresponding to the information of information symbol 7204 is output.

  As described above, a transmission method for transmitting a plurality of spread spectrum communication system data channel modulation signals from a plurality of antennas in the same frequency band, and a transmission method for transmitting a single spread spectrum communication system data channel modulation signal from one antenna. By switching, the quality of information is improved.

  However, the radio wave propagation environment estimation signals 7718 and 7743 correspond to the transmission devices 7602 and 7603 of the terminal in FIG.

  Next, the operation at the start of communication will be described. When a base station transmits a modulated signal by a transmission method in which a base station transmits modulated signals of a plurality of spread spectrum communication data channels from a plurality of antennas in the same frequency band at the start of communication, the terminal has the same radio wave propagation status, for example, and the same When the base station is not suitable for a transmission method in which modulated signals of multiple channels are transmitted from multiple antennas in the frequency band, the base station transmits modulated signals of data channels of multiple spread spectrum communication systems from multiple antennas in the same frequency band. If the modulated signal is transmitted by the transmission method, the quality of the received data is deteriorated.

  Therefore, at the start of communication with the terminal, the base station transmission signal is, for example, spread spectrum communication method A so that the information symbol of spread spectrum communication method A and the information symbol of spread spectrum communication method B in FIG. A plurality of spread spectrum communication systems in the same frequency band, such as the time of control symbol 7903 and control symbol 7909 of spread spectrum communication system B, the time of control symbol 7904 of spread spectrum communication system A and the control symbol 7913 of spread spectrum communication system B No data channel exists.

  The frame configuration signal generation unit 209 in FIG. 80 performs the time of the control symbol 7903 of the spread spectrum communication A and the control symbol 7909 of the spread spectrum communication system B in FIG. 79 and the control symbol 7904 of the spread spectrum communication system A at the start of communication with the terminal. And a setting such that a plurality of spread spectrum communication system data channels do not exist in the same frequency band, such as the time of control symbol 7913 of spread spectrum communication system B, and the frame configuration at that time is output as frame configuration signal 210 To do.

  FIG. 82 shows a base station transmission signal control symbol 7903, spread spectrum communication system B control symbol 7909, spread spectrum communication system A control symbol 7904, and spread spectrum communication system B of the base station transmission signal of FIG. The radio wave propagation environment is estimated from the received signal of the control symbol 7913, and radio wave propagation environment estimation signals 7718 and 7743 are generated.

  FIG. 78 shows a base station transmission signal, a control symbol 7903 for spread spectrum communication A, a control symbol 7909 for spread spectrum communication system B, a control symbol 7904 for spread spectrum communication system A, and a control symbol for spread spectrum communication system B. Based on the radio wave propagation environment estimation signals 7718 and 7743 in which the radio wave propagation environment is estimated from the received signal of 7913, the transmission method request information generation unit 7801 generates a plurality of modulated signals of data channels of a plurality of spread spectrum communication systems in the same frequency band. 79, information requesting one of a transmission method for transmitting from one antenna and a transmission method for transmitting a modulated signal of a data channel of one spread spectrum communication method from one antenna is referred to as transmission request information 7802 as information symbol 7913 in FIG. , 7914.

  The base station receiver FIG. 75 shows a modulation signal of a plurality of spread spectrum communication data channels in the same frequency band from the transmission request information included in the information symbol 7913 among the transmission signals transmitted by the terminal transmitter FIG. The transmission method for transmitting from a plurality of antennas and the transmission method for transmitting a modulation signal of a data channel of one spread spectrum communication method from one antenna, and transmitting the modulation signal of the determined transmission method from the antenna .

  As described above, at the start of communication with the terminal, the quality of information is improved by setting such that a plurality of spread spectrum communication system data channels do not exist in the same frequency band.

  However, in the above description, a modulation signal for requesting that the terminal wants to communicate with the base station may be transmitted first.

  In the above description, as shown in FIG. 79, there is a control channel in both the spread spectrum communication system A and the spread spectrum communication system B. For example, as shown in FIG. The same can be applied to the case where there is. At this time, the transmission apparatus of the base station is configured without the control channel modulation and spreading unit 8012 of spread spectrum communication system B in FIG.

  The number of spread spectrum communication systems multiplexed in the same frequency band has been described for switching between two channels and one channel. However, the present invention is not limited to this. For example, the number of spread spectrum communication systems can be three in the same frequency band. In this case, the transmission apparatus of the base station switches the multiplexing number between 1 to 3 spread spectrum communication systems.

  The method can be similarly applied to a method in which a modulated signal is generated from the signal of the spread spectrum communication method by the OFDM method. An example of the configuration of the control symbols of the spread spectrum communication system transmitted by the base station at that time is shown in FIG. 85 and FIG. In FIG. 85, the control symbols are spread on the time axis. In FIG. 86, the control symbols are spread on the frequency axis. The information symbols are also spread on either the time axis or the frequency axis as in FIGS. 85 and 86, and are multiplexed with the control channel signal. The transmitting device and receiving device of the base station and terminal at this time can be configured as shown in FIGS. 75, 76, 78, 80, and 82 described in the frame configuration of FIG.

  In the present embodiment, the number of data channels in the spread spectrum communication method A and the spread spectrum communication method B has been described as one channel. However, the number of data channels is not limited to one, and the number of data channels may be two or more. it can. Further, the codes used for spreading and despreading in the spread spectrum communication system A and the spread spectrum communication B can be implemented by the same code or different codes.

  The antenna in the above description may be composed of a plurality of antennas and is referred to as “antenna”, but may be considered as an antenna portion composed of a plurality of antennas.

  As described above, a modulation signal of a plurality of spread spectrum communication methods can be transmitted, a modulation signal of a transmission method transmitting a control channel is transmitted, a communication partner receives the modulation signal, and a radio wave propagation environment in each antenna Is estimated from the received signal of the control channel, information on the estimated radio wave propagation environment is transmitted, and based on the radio wave propagation environment information, modulated signals of the data channels of a plurality of spread spectrum communication systems in the same frequency band are A transmission method for transmitting from, a communication method for selecting one of transmission methods for transmitting a modulation signal of a data channel of one spread spectrum communication method from one antenna, a wireless communication apparatus using the communication method, and a plurality of transmission methods A modulation signal of a spread spectrum communication method can be transmitted, and a modulation signal of a transmission method transmitting a control channel is transmitted. The communication partner receives the modulated signal, estimates the radio wave propagation environment at each antenna from the received signal of the control channel, and modulates the data channels of multiple spread spectrum communication systems in the same frequency band from the estimated radio wave propagation environment information A transmission method for transmitting a signal from a plurality of antennas and a transmission method for transmitting a modulated signal of a data channel of one spread spectrum communication method from a single antenna are transmitted. Transmission method for transmitting a plurality of spread spectrum communication system data channel modulation signals from a plurality of antennas in the same frequency band, and a transmission method for transmitting a single spread spectrum communication system data channel modulation signal from one antenna A communication method for selecting one of the transmission methods, and a wireless communication device using the communication method With, it is possible to transmit information more accurately.

  The transmission method according to the present invention is advantageous as a communication device and the like because it has an advantageous effect that the received transmission apparatus can easily separate the received multiple modulated signals at the same time as the data transmission speed is improved.

101 pilot symbol in channel A 102 guard symbol in channel A 103 data symbol in channel A 109 guard symbol in channel B 110 pilot symbol in channel B 111 data symbol in channel B 201 transmission digital signal in channel A 202 modulation signal generation in channel A Unit 203 Channel A modulation signal 204 Channel A radio unit 205 Channel A transmission signal 206 Channel A power amplification unit 207 Amplified channel A transmission signal 208 Channel A antenna 209 Frame configuration generation unit 210 Frame configuration signal 211 Channel B transmission digital signal 212 Channel B modulation signal generator 213 Channel B modulation signal 214 Channel B radio unit 215 Channel B Signal 216 Channel B power amplification section 217 Amplified channel B transmission signal 218 Channel B antenna 301 Transmission digital signal 302 Data symbol modulation signal generation section 303 In-phase component 304 of data symbol transmission quadrature baseband signal Quadrature component 305 Pilot symbol modulation signal generation section 306 In-phase component 307 of pilot symbol transmission quadrature baseband signal Quadrature component 308 Guard symbol modulation signal generation section 309 In-phase component of transmission quadrature baseband signal of guard symbol 310 Quadrature component 311 Frame configuration signal 312 In-phase component Switching unit 313 In-phase component 314 of selected transmission quadrature baseband signal Quadrature component switching unit 315 Quadrature component 316 of selected transmission quadrature baseband signal Quadrature modulator 317 Modulation signal 401 QP K signal point 402 pilot symbol signal point 403 guard symbol signal point 501 antenna 502 received signal 503 radio unit 504 received quadrature baseband signal in-phase component 505 quadrature component 506 channel A channel distortion estimation unit 507 channel A transmission Path distortion estimation signal 508 Channel B transmission path distortion estimation unit 509 Channel B transmission path distortion estimation signal 510 Delay unit 511 In-phase component 512 of delayed received quadrature baseband signal 512 Component 513 Antenna 514 Received signal 515 Radio unit 516 Receive quadrature In-phase component of baseband signal 517 Quadrature component 518 Channel A transmission path distortion estimation unit 519 Channel A transmission path distortion estimation signal 520 Channel B transmission path distortion estimation unit 521 Channel B transmission path distortion estimation signal 522 Delay unit 523 Delay Received quadrature In-phase component 524 of quadrature component 525 Signal processing unit 526 In-phase component of channel A received quadrature baseband signal 527 Quadrature component 528 Demodulator 529 Channel A received digital signal 530 Channel B received quadrature baseband signal in-phase component 531 Quadrature component 532 Demodulator 533 Channel B received digital signal 601 Channel A pilot symbol 602 Channel A guard symbol 603 Channel A data symbol 604 Channel A data symbol 605 Channel A data symbol 606 Channel A data symbol 607 Channel A pilot symbol 608 Channel A guard symbol 609 Channel B guard symbol 610 Channel B pilot symbol 611 Channel B data symbol 612 Channel B data symbol 613 Channel B data symbol 614 Channel B data symbol 615 Channel B guard symbol 616 Channel B pilot symbol 701 Channel A pilot symbol 702 Channel A pilot symbol 703 Channel A guard symbol 704 Channel A Guard symbol 705 channel A data symbol 706 channel A pilot symbol 707 channel A pilot symbol 708 channel A guard symbol 709 channel A guard symbol 710 channel B guard symbol 711 channel B guard symbol 712 channel B pilot Symbol 713 Channel B pilot symbol 714 Channel B data symbol 715 Channel B guard 716 Channel B guard symbol 717 Channel B pilot symbol 718 Channel B pilot symbol 801 Antenna 802 Received signal 803 Radio unit 804 Received quadrature baseband signal in-phase component 805 Quadrature component 806 Channel A transmission path distortion estimator 807 channel A transmission path distortion estimation signal 808 Channel B transmission path distortion estimation section 809 Channel B transmission path distortion estimation signal 810 delay section 811 In-phase component 812 of delayed received quadrature baseband signal 812 Quadrature component 813 Antenna 814 Received signal 815 Radio section 816 In-phase component of received quadrature baseband signal 817 Quadrature component 818 Channel A channel distortion estimation unit 819 Channel A channel distortion estimation signal 820 Channel B channel distortion estimation unit 821 Channel B channel distortion estimation signal 822 Delay unit 823 Delayed received quadrature baseband signal in-phase component 824 Quadrature component 825 Antenna 826 Received signal 827 Radio unit 828 Received quadrature baseband signal in-phase component 829 Quadrature component 830 Channel A channel distortion estimation unit 831 Channel A Transmission path distortion estimation signal 832 Channel B transmission path distortion estimation unit 833 Channel B transmission path distortion estimation signal 834 Delay unit 835 Delayed received quadrature baseband signal in-phase component 836 Quadrature component 837 Antenna 838 Received signal 839 Radio unit 840 In-phase component 841 of received quadrature baseband signal Quadrature component 842 Channel A channel distortion estimation unit 843 Channel A channel distortion estimation signal 844 Channel B channel distortion estimation unit 845 Channel B channel distortion estimation signal 846 Delay unit 847 Delayed reception In-phase component 848 of quadrature baseband signal Quadrature component 849 Field strength estimation unit 850 Received field strength estimation signal 851 Phase difference estimation unit 852 Channel A phase difference estimation signal 853 Phase difference estimation unit 854 Channel B phase difference estimation signal 855 Signal selection Unit 856 signal group 857 signal group 858 signal processing unit 859 in-phase component 860 of channel A received quadrature baseband signal quadrature component 861 in-phase component 862 of channel B received quadrature baseband signal quadrature component 863 demodulation unit 864 channel A received digital Signal 865 Demodulation unit 866 Channel B received digital signal 901 Field strength estimation unit 1201 Spread spectrum communication system A transmission digital signal 1202 Spread spectrum communication system A modulation signal generation unit 1203 Spread spectrum communication system A modulation signal 1204 spectrum Spread spectrum communication system A radio unit 1205 Spread spectrum communication system A transmission signal 1206 Spread spectrum communication system A power amplification unit 1207 Amplified spread spectrum communication system A transmission signal 1208 Radio spectrum spread system A antenna 1209 Spread spectrum communication system B transmission digital signal 1210 Spread spectrum communication system B modulation signal generation unit 1211 Spread spectrum communication system B modulation signal 1212 Spread spectrum communication system B radio unit 1213 Spread spectrum communication system B transmission signal 1214 Spread spectrum Communication system B power amplifying unit 1215 Amplified spread spectrum communication system B transmission signal 1216 As a radio wave, spread spectrum communication system B antenna 1217 Frame configuration generating unit 1218 Frame configuration signal 1301 Code for Bol modulation signal generator 1302 pilot symbols Cpa (t)
1303 In-phase component 1304 of pilot symbol transmission quadrature baseband signal 1304 Quadrature component 1305 Transmission digital signal 1306 Primary modulation unit 1307 In-phase component 1308 of quadrature baseband signal after primary modulation of channel 0 Quadrature component 1309 Spreading unit 1310 For channel 0 Code C0a (t)
1311 In-phase component 1312 of channel 0 transmission quadrature baseband signal Quadrature component 1313 Primary modulation unit 1314 In-phase component 1315 of quadrature baseband signal after primary modulation of channel 1 Quadrature component 1316 Spreading unit 1317 Code C1a (t )
1318 In-phase component 1319 of transmission quadrature baseband signal of channel 1 Quadrature component 1320 Frame component signal 1321 Adder 1322 In-phase component of added transmission quadrature baseband signal 1323 Adder 1324 Quadrature component 1325 of added transmission quadrature baseband signal In-phase component switching unit 1326 In-phase component 1327 of selected transmission quadrature baseband signal Quadrature component switching unit 1328 Quadrature component 1329 of selected transmission quadrature baseband signal Quadrature modulator 1330 Modulated signal 1501 Transmission path distortion of spread spectrum communication system A Estimator 1502 Transmission path distortion estimation signal 1503 of spread spectrum communication system A Transmission path distortion estimation section 1504 of spread spectrum communication system B Transmission path distortion estimation signal 1505 of spread spectrum communication system B Transmission path distortion estimation unit 1506 Transmission path distortion estimation signal 1507 of spread spectrum communication system A Transmission path distortion estimation unit 1508 of spread spectrum communication system B Transmission path distortion estimation signal 1509 of spread spectrum communication system B Signal processing section 1510 Spread spectrum communication system In-phase component 1511 of received quadrature baseband signal of A Quadrature component 1512 In-phase component of received quadrature baseband signal of spread spectrum communication system B 1513 Quadrature component 1514 Spread spectrum communication system A demodulator 1515 Received digital signal group of spread spectrum communication system A 1516 Spread Spectrum Communication System B Demodulator 1517 Received Digital Signal Group of Spread Spectrum Communication System B

Claims (16)

At a first time, the first subcarrier is a symbol for demodulation, and the second subcarrier generates a first transmission signal in which the in-phase and quadrature signals in the in-phase-quadrature plane are zero signals,
At the first time, the first subcarrier is a signal having in-phase and quadrature signals in the in-phase-quadrature plane being zero, and the second sub-carrier is a second transmission signal that is a symbol for the demodulation. Produces
Converting the generated first transmission signal into a first OFDM modulated signal;
Converting the generated second transmission signal into a second OFDM modulated signal;
Transmitting the first OFDM modulated signal from a first antenna;
Transmitting the second OFDM modulated signal from the second antenna in the same frequency band as the frequency band in which the first OFDM modulated signal was transmitted;
Transmission method. In the first transmission signal, at the first time, a third subcarrier is a symbol for the demodulation, and a fourth subcarrier is a signal having zero in-phase and quadrature signals in the in-phase-quadrature plane. Yes,
The second transmission signal is a signal in which the third subcarrier is zero in-phase and quadrature signals in the in-phase-quadrature plane at the first time, and the fourth sub-carrier is used for the demodulation. A symbol,
The transmission method according to claim 1. The symbol for demodulation is a pilot symbol symbol or a preamble.
The transmission method according to claim 1. The symbol for demodulation is a symbol for estimating a channel variation or a symbol for estimating a frequency offset.
The transmission method according to claim 1. The symbol for demodulation is a symbol having a constant amplitude in the in-phase-orthogonal plane.
The transmission method according to claim 1. At a first time, the first subcarrier is a symbol for demodulation, and the second subcarrier generates a first transmission signal in which in-phase and quadrature signals in the in-phase-quadrature plane are zero signals, At a first time, the first subcarrier is a signal in which in-phase and quadrature signals in the in-phase-quadrature plane are zero, and the second sub-carrier is a second transmission signal that is a symbol for the demodulation. A signal generator to generate;
An OFDM converter that converts the first transmission signal into a first OFDM modulation signal and converts the second transmission signal into a second OFDM modulation signal;
A first antenna for transmitting the first OFDM modulated signal;
A second antenna that transmits the second OFDM modulated signal in the same frequency band as the frequency band that transmitted the first OFDM modulated signal;
A transmission device including: In the first transmission signal, at the first time, a third subcarrier is a symbol for the demodulation, and a fourth subcarrier is a signal having zero in-phase and quadrature signals in the in-phase-quadrature plane. Yes,
In the second transmission signal, the third subcarrier is a signal in which in-phase and quadrature signals in the in-phase-quadrature plane are zero, and the fourth sub-carrier is a symbol for the demodulation.
The transmission device according to claim 6. The symbol for demodulation is a pilot symbol symbol or a preamble.
The transmission device according to claim 6. The symbol for demodulation is a symbol for estimating a channel variation or a symbol for estimating a frequency offset.
The transmission device according to claim 6. The symbol for demodulation is a symbol having a constant amplitude in the in-phase-orthogonal plane.
The transmission device according to claim 6. At a first time, the first subcarrier is a symbol for demodulation, and the second subcarrier generates a first transmission signal in which in-phase and quadrature signals in the in-phase-quadrature plane are zero signals, At a first time, the first subcarrier is a signal in which in-phase and quadrature signals in the in-phase-quadrature plane are zero, and the second sub-carrier is a second transmission signal that is a symbol for the demodulation. A signal generator to generate;
An OFDM converter that converts the first transmission signal into a first OFDM modulation signal and converts the second transmission signal into a second OFDM modulation signal;
An OFDM signal generator. In the first transmission signal, at the first time, a third subcarrier is a symbol for the demodulation, and a fourth subcarrier is a signal having zero in-phase and quadrature signals in the in-phase-quadrature plane. Yes,
In the second transmission signal, the third subcarrier is a signal in which in-phase and quadrature signals in the in-phase-quadrature plane are zero, and the fourth sub-carrier is a symbol for the demodulation.
The OFDM signal generation device according to claim 11. The first OFDM modulated signal and the second OFDM modulated signal are signals transmitted in the same frequency band.
The OFDM signal generation device according to claim 11. The symbol for demodulation is a pilot symbol symbol or a preamble.
The OFDM signal generation device according to claim 11. The symbol for demodulation is a symbol for estimating a channel variation or a symbol for estimating a frequency offset.
The OFDM signal generation device according to claim 11. The symbol for demodulation is a symbol having a constant amplitude in the in-phase-orthogonal plane.
The OFDM signal generation device according to claim 11.

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