WO2006022136A1 - データ通信システム、受信装置及び送信装置 - Google Patents
データ通信システム、受信装置及び送信装置 Download PDFInfo
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- WO2006022136A1 WO2006022136A1 PCT/JP2005/014506 JP2005014506W WO2006022136A1 WO 2006022136 A1 WO2006022136 A1 WO 2006022136A1 JP 2005014506 W JP2005014506 W JP 2005014506W WO 2006022136 A1 WO2006022136 A1 WO 2006022136A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0016—Time-frequency-code
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0072—Error control for data other than payload data, e.g. control data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0226—Channel estimation using sounding signals sounding signals per se
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Definitions
- the present invention relates to a data communication system, a receiving device, and a transmitting device, and more specifically o
- the present invention relates to a data communication system using FDM technology.
- OFDM Orthogonal Frequency Division Multiplexing
- OFCDM Orthogonal Frequency and Code Division Multiplexing
- MC-CDMA Multi-Carrier Code Division Multiple Access
- OFCDM Orthogonal Frequency and Code Division Multiplexing
- MC-CDMA Multi-Carrier Code Division Multiple Access
- OFDM technology incorporates the idea of spread spectrum and code division multiplexing.
- MC CDMA is a power used for systems that use multiple narrowband CDMA signals in parallel and communicate with each other. In this case, it is limited to those based on OFDM technology.
- MC-CDMA based on OFDM technology is considered to be included in OFCDM, and the following expression is used as OFCDM and! Below is a brief description of OFDM and OFCDM!
- FIG. 41 shows a block diagram of OFDM.
- Nc is the number of subcarriers and Ns is the number of OFDM symbols.
- a pilot symbol for channel (wireless communication channel) estimation is usually included, but it is omitted here.
- the transmission symbols that are parallelized for each Nc symbol by the SZP conversion (serial parallel conversion) 101 become the respective subcarrier components, and IFFT (Inverse Fast Fourier Transform) processing 102 is performed.
- PZS conversion (parallel serial conversion) 103 is performed to form a time signal sequence.
- the processing unit of FFT Fast Fourier Transform
- Add GI104 a GI (guard interval) is added for each OFDM symbol. As shown in Fig. 42, the guard interval inserts the signal behind the OFDM symbol before the OFDM symbol. This guard interval can suppress interference caused by delay waves in the wireless communication path.
- FIG. 43 shows an arrangement of transmission symbols in a transmission signal within one frame.
- one frame is composed of Ns OFDM symbols, and transmission symbols are sequentially arranged in the frequency direction in the OFDM symbols.
- OFDM symbols that is, FFT units are cut out according to the detection result of timing detection 105 using Remove GI106 !, S / P conversion 107 is performed, and then FFT processing is performed. 108 is performed to extract each subcarrier component. Thereafter, PZS conversion 109 can be performed to obtain a symbol string in the same order as the symbol arrangement of the transmission frame.
- frequency domain or time domain spreading is performed to arrange the same transmission symbol across a plurality of subcarriers or a plurality of OFDM symbols as shown in FIG.
- the spreading factor power in the frequency domain the same data symbol is transmitted on four subcarriers.
- the spreading factor in the frequency domain and the time domain are both 2, and the same data symbol is transmitted with two subcarriers and two OFDM symbols.
- spreading with a spreading factor of 4 is performed, so the transmission rate of the transmitted symbols is 1Z4. This is the idea of spread spectrum, and the signal power density can be lowered by transmitting signals using a frequency band or time slot that is larger than the frequency band or time slot required for transmission of transmission symbols.
- the frequency diversity effect can be obtained by using a wide frequency range.
- orthogonal codes as spreading codes at the time of spreading it becomes possible to multiplex and transmit different transmission symbols using the same region. This is the idea of code division multiplexing.
- the transmission rate can be increased by code division multiplexing, and the transmission rate can be controlled according to the channel environment.
- FIG. 45 is a block diagram showing a general OFCDM transmitter and receiver.
- (A) shows the receiver as shown in Fig. 45 (B).
- the spreading factor of frequency domain spreading is SF.
- the number of transmitted symbols per frame is 1ZSF compared to OFDM.
- the symbols parallelized for each NcZSF symbol by SZP conversion 111 are subjected to frequency domain spreading processing and become subcarrier components.
- the frequency domain spreading process 112 one symbol is copied to SF subcarrier components and multiplied by spreading codes ⁇ C 1, C 2,.
- SF complex value series is used as spreading code. Further, IFFT processing 113 and PZS conversion 114 are performed to form a time signal sequence. In addition, Add Gil 15 adds a GI (guard interval) for each OFDM symbol.
- GI guard interval
- timing detection channel estimation is performed in the timing detection Z channel estimation processing 116, and the timing for extracting the received signal for performing the FFT processing and the channel estimation value are obtained. It is done. From this channel estimate, the weighting factor to be multiplied by each subcarrier after FFT is determined.
- the guard interval is removed from the received signal by Remove Gil 17, and the control channel is demodulated. Since the control channel is subjected to OFCDM modulation that performs frequency-domain spreading, despreading is performed using the complex conjugate of the spreading code used for spreading and the weighting factor obtained by the channel estimation unit. There are various ways to determine the weighting factor. Here, the complex conjugate of the channel coefficients ⁇ W, W, ⁇ , W ⁇ corresponding to each subcarrier is used.
- SZP conversion 118 FFT processing 119, frequency domain despreading 120, and PZS conversion 121 are executed.
- SCS-MC-CD MA system based on OFDM Non-patent Document 1
- VSF-OFCDM system based on OFDM Non-patent Document 2
- the control channel and communication channel are allocated to different subcarriers on the frequency axis.
- the VSF-OFCDM method multiplexes the data channel spread in the time domain and the control channel spread in both the time frequency domains using orthogonal codes.
- Patent Document 1 is an invention related to OFDM and MC-CDMA. This is a cellular mobile communication system that uses OFDM depending on the communication path between mobile terminals and base stations. Switching between V and MC — CDMA use per transmission slot! Patent Document 1: Japanese Patent Application Laid-Open No. 2004-158901
- Non-Patent Document 1 Nagai et al., “SCS—MC—A Study on Common Control Channel Synchronization in CDMA”, 2004 IEICE General Conference B— 5— 81
- Non-Patent Document 2 Kishiyama et al., “Outdoor Experiment Results of Adaptive Modulation / Demodulation and Channel Coding in Downlink VSF-OFCDM Broadband Wireless Access”, 2004 IEICE General Conference B— 5— 94
- the SCS-MC-CDMA described above allocates a part of a plurality of subcarriers used in OFDM as a control channel.
- problems such as the fact that specific subcarriers cannot be used for data transmission and the frequency diversity effect is difficult to obtain.
- VSF-OFCDM the number of code multiplexes is limited by the amount assigned to the control channel, and the code must be assigned so that the control channel and traffic channel do not interfere. The problem is that the low.
- the present invention has been made in view of the above circumstances, and in a next-generation cellular mobile communication system or the like, a traffic channel that enables high-speed data transmission and a control channel that transmits a low-speed control signal.
- the purpose is to solve the problems related to multiplexing.
- the present invention also performs high-speed data transmission in next-generation cellular mobile communication systems and the like.
- the purpose is to solve the problems associated with multiplexing of traffic channel 1 and traffic channel 2 for low-speed data transmission.
- the traffic channel and the control channel are multiplexed using signals, with the time axis, the frequency axis, and the code not being orthogonal even if they are shifted.
- Increasing the power of the control channel also increases the interference from the control channel to the traffic channel. This problem can be dealt with by using interference cancellation (cancelling) technology as necessary. If the channel quality is sufficiently high, the traffic channel can be received without interference cancellation. When the channel quality is low, it is possible to apply a method of generating a replica (replica) of the control channel signal after determining the control channel symbol and a method of generating a replica by decoding and re-encoding the control channel. Yes, it can be used and separated according to the channel quality.
- traffic channel information transmitted in the same frame is included in the control channel, it is determined whether the traffic channel includes information addressed to the local station by processing the control channel first, There is no need to perform receive processing for unnecessary traffic channels. If the traffic channel contains information addressed to the local station and the channel quality is not good enough, the quality of the traffic channel can be degraded by generating a signal replica of the control channel and canceling the received signal power. Can be suppressed. This was previously This is also effective when the information about the traffic channel of a frame to be sent later is included in the control channel included in the sent frame.
- the first technical means is a communication system using orthogonal frequency division multiplexing (OFDM) technology, which includes a traffic channel for transmitting traffic data and a control channel for transmitting control data, and uses OFDM modulation.
- a transmission signal is generated by multiplexing the generated traffic channel signal and a control channel signal generated using a signal that is not orthogonal to the traffic channel signal in any of time, frequency, and code. It is characterized by that.
- the second technical means is the first technical means, wherein the control channel signal is spread over a plurality of subcarriers and / or a plurality of OFDM symbols of the OFDM modulated traffic channel signal. It is a characteristic that it is a signal.
- the third technical means is the first technical means, wherein the control channel signal is a signal encoded by a low-rate block code, and the codeword is a single OFDM symbol. This is a signal configured to be transmitted using a plurality of subcarriers.
- the fourth technical means is the first technical means, and the receiving station receives a signal in which a traffic channel and a control channel are multiplexed, demodulates the control channel, and determines a signal point. A duplicate of the control channel signal multiplexed on the received signal is generated based on the received symbol symbol obtained by performing the received signal power control channel signal component is removed, and then the traffic channel is demodulated. Is.
- the fifth technical means is the first technical means, in which the data of the control channel is error-corrected and the traffic channel and the control channel are multiplexed on the receiving station side.
- Control channel data obtained by receiving the signal and demodulating and decoding the control channel Generate a duplicate of the control channel signal multiplexed with the received signal, and after removing the control channel signal component from the received signal, This is characterized by demodulating the traffic channel.
- the sixth technical means is the first technical means, wherein the control channel data is error-corrected code and is transmitted to the control channel data at or after that time.
- the destination information of the traffic channel is included, and the receiving station receives the multiplexed signal of the traffic channel and the control channel, demodulates and decodes the control channel, extracts the control channel data, and the past or the time From the control information obtained in step 1, it is determined whether or not the traffic channel includes information addressed to the local station. If the traffic channel includes information addressed to the local station, the extracted control channel data power is included in the received signal. A duplicate of the multiplexed control channel signal is generated, the control channel signal component is removed from the received signal, and then the traffic channel is demodulated. Is obtained by it said.
- the seventh technical means is a communication system using orthogonal frequency division multiplexing (OFDM) technology, and includes a traffic channel 1 for transmitting high-speed traffic data, a traffic channel 2 for transmitting low-speed traffic data, Traffic channel 2 generated using signals that are not orthogonal to the signal of traffic channel 1 and the signal of traffic channel 1 generated using OFDM modulation.
- the transmission signal is generated by multiplexing these signals.
- the eighth technical means is the seventh technical means, wherein the traffic channel 2 signal includes a plurality of subcarriers or a plurality of OF DM symbols of the traffic channel 1 signal modulated by OFDM, It is characterized by the signal being spread over both regions.
- the ninth technical means is the seventh technical means, wherein the traffic channel 2 signal is a signal encoded by a low-rate block code, and the codeword is a single codeword. It is characterized by being a signal configured to be transmitted using multiple subcarriers in the OFDM symbol.
- the tenth technical means is the seventh technical means, on the receiving station side, the traffic channel 1 and traffic channel 2 received signal multiplexed, traffic channel 2 demodulated and signal point determined by demodulating traffic channel 2 symbol power received traffic channel 2 multiplexed on received signal This is characterized in that after duplicating the signal and removing the signal component of traffic channel 2 from the received signal, demodulation processing of traffic channel 1 is performed.
- the eleventh technical means is the seventh technical means, in which the data of traffic channel 2 is error-corrected and the traffic channel 1 and traffic channel 2 are multiplexed on the receiving station side. From the traffic channel 2 data obtained by demodulating and decoding traffic channel 2 and generating a duplicate of traffic channel 2 signal multiplexed with the received signal. After the signal component is removed, the traffic channel 1 is demodulated.
- the twelfth technical means is a transmitting apparatus using orthogonal frequency division multiplexing (OFDM) modulation, means for OFDM-modulating traffic channel data to generate a traffic channel signal, Control channel data force using signals that are not orthogonal in time, frequency, or code, and means for generating a control channel signal, and generating a transmission signal by multiplexing the traffic channel signal and the control channel signal Means.
- OFDM orthogonal frequency division multiplexing
- the thirteenth technical means is the twelfth technical means, wherein the control channel signal generating means transmits a control channel symbol for transmitting control channel data to a plurality of OFDM-modulated traffic channel signals.
- a carrier or multiple OFDM symbols, some! / ⁇ , are characterized by including means for spreading over both regions.
- the fourteenth technical means is the twelfth technical means, wherein the control channel signal generating means includes code rate means based on a low-rate block code, and a plurality of code symbols each having a single OFDM symbol. And means for arranging so as to be transmitted using subcarriers.
- the fifteenth technical means is a receiving device that receives the signal transmitted by the twelfth technical means, from the reception symbol obtained by demodulating the control channel and determining the signal point. Means for generating a copy of the control channel signal multiplexed with the received signal; And a means for removing a control channel signal component.
- the sixteenth technical means is a receiving device for receiving the signal transmitted by the twelfth technical means, wherein the control channel data is error-corrected and demodulated and decoded.
- Control channel data power obtained by: means for generating a copy of the control channel signal multiplexed on the received signal; and means for removing the control channel signal component from the received signal Is.
- the seventeenth technical means is a receiving device for receiving the signal transmitted by the twelfth technical means, wherein the control channel data is error-corrected code, and the control channel is demodulated and decoded. And control channel data is extracted from the control information obtained at that time to determine whether the traffic channel includes information addressed to the local station. If the destination address information is included, a duplicate of the extracted control channel data is generated in the received signal, and the control channel signal component is removed from the received signal, and then the traffic channel is demodulated. It is characterized by doing.
- the eighteenth technical means is a receiver that receives the signal transmitted by the twelfth technical means, receives a signal in which a traffic channel and a control channel are multiplexed, and demodulates the control channel.
- the control channel symbol power obtained by the determination The control channel replica is generated, and the canceling function 1 that removes the control channel signal component from the received signal power, and the traffic channel and control channel multiplexed signal are Received signal strength Cancels the control channel signal component by generating a duplicate of the control channel multiplexed with the received signal from the control channel data obtained by demodulating and decoding the control channel Function 2, and canceling function 1, canceling function 2, or no canceling depending on the quality of the communication channel Is obtained by and performing demodulation processing traffic Chiya, channel select.
- a nineteenth technical means is a receiving device that receives a signal transmitted by the twelfth technical means, receives a signal in which a traffic channel and a control channel are multiplexed, and demodulates the control channel.
- Control channel symbol power obtained by judging, multiplexed on received signal Canceling function 1 that generates a duplicated control channel signal and removes the control channel signal component from the received signal, receives the multiplexed signal of the traffic channel and control channel, and demodulates and decodes the control channel
- Control channel data obtained by performing a canceling function 2 that generates a duplicate of the control channel multiplexed on the received signal and removes the control channel signal component from the received signal. Only one of them has a canceling function, and depending on the quality of the communication channel, it can select either with or without canceling to demodulate the traffic channel. .
- a twentieth technical means is a transmitter using orthogonal frequency division multiplexing (OFDM) modulation, means for generating a traffic channel 1 signal by OFDM modulating traffic channel 1 data, and traffic channel 1 Means for generating traffic channel 2 signals using signals that are not orthogonal in time, frequency, or code, and multiplexing traffic channel 1 signals and traffic channel 2 signals. And means for generating a transmission signal.
- OFDM orthogonal frequency division multiplexing
- the twenty-first technical means is the twentieth technical means, wherein the traffic channel 2 signal generation means converts the symbol for transmitting the traffic channel 2 into the signal of the OFDM-modulated traffic channel 1 signal. It is characterized by including means for spreading over multiple subcarriers and / or multiple OFDM symbols.
- the twenty-second technical means is the twentieth technical means, wherein the signal generation means for traffic channel 2 includes a code rate means using a low-rate block code, and a codeword of a single OFDM symbol. And means for arranging to transmit using a plurality of subcarriers.
- a twenty-third technical means is a receiving device that receives a signal transmitted by the twentieth technical means, and obtains a traffic channel obtained by demodulating the traffic channel 2 and determining a signal point. And means for generating a replica of the traffic channel 2 signal multiplexed from the second symbol to the received signal, and means for removing the traffic channel 2 signal component from the received signal.
- the twenty-fourth technical means is a receiver for receiving the signal transmitted by the twentieth technical means. Therefore, the traffic channel 2 data is error-corrected, and the traffic channel 2 data multiplexed by the received signal is obtained from the traffic channel 2 data obtained by demodulating and decoding the traffic channel 2. And a means for removing the signal component of the received signal power traffic channel 2.
- the twenty-fifth technical means is a receiving device for receiving the signal transmitted by the twentieth technical means, and the symbol power of traffic channel 2 obtained by demodulating and determining traffic channel 2 received signal
- a canceling function 1 that generates a duplicate of the traffic channel 2 signal multiplexed into the received signal and removes the signal component of traffic channel 2 from the received signal
- the data power of 2 has a canceling function 2 that generates a duplicate of the traffic channel 2 signal multiplexed on the received signal and removes the signal component of the traffic channel 2 from the received signal.
- Canceling function 1, Canceling function 2, and No canceling Te is obtained by and performing demodulation of traffic channel 1.
- the twenty-sixth technical means is a receiving device for receiving the signal transmitted by the twentieth technical means, and the symbol power of traffic channel 2 obtained by demodulating and determining traffic channel 2 received signal
- a canceling function 1 that generates a duplicate of the traffic channel 2 signal multiplexed into the received signal and removes the signal component of traffic channel 2 from the received signal
- a traffic channel obtained by demodulating and decoding traffic channel 2 Data force of 2 Canceling function 2 that creates a duplicate of traffic channel 2 multiplexed on the received signal and removes the signal component of traffic channel 2 from the received signal, and one of the two canceling functions It has only one canceling function, and canceling is possible depending on the quality of the communication channel. And without canceling, by selecting one of those it was characterized by performing the demodulation of traffic channel 1.
- the twenty-seventh technical means uses orthogonal frequency division multiplexing (OFDM) technology, and the OFDM-modulated signal by OFDM technology is spread over a plurality of subcarriers and / or a plurality of OFDM symbols.
- Modulation method characterized by signal is a transmission device that generates traffic channel signals by OFCDM modulating traffic channel data, and is orthogonal to the traffic channel signals in any of time, frequency, and code.
- Control channel data power using a signal not to be transmitted, control channel signal generating means for generating a control channel signal, and transmission signal generating means for generating a transmission signal by multiplexing the traffic channel signal and the control channel signal It is characterized by that.
- the twenty-eighth technical means uses orthogonal frequency division multiplexing (OFDM) technology, and a signal modulated by OFDM by OFDM technology is spread over a plurality of subcarriers and / or a plurality of OFDM symbols.
- OFDM orthogonal frequency division multiplexing
- Control channel signal generation means for generating a control channel signal by modulating with a method
- a control channel signal and a traffic channel signal are mutually non-orthogonal in terms of time, frequency, and code, and time, frequency, and code of each other Switching means for switching to a signal orthogonal to either, traffic channel signal and control Transmission signal generating means for generating a transmission signal by multiplexing channel signals.
- the switching means switches to a non-orthogonal signal when the quality of the communication path is good, and when the quality of the communication path is poor. It is characterized by switching to orthogonal signals.
- the thirtieth technical means is the twenty-eighth technical means, and the switching means switches between the non-orthogonal signal and the orthogonal signal according to the number of spreading codes currently used in the traffic channel signal. It is characterized by that.
- the thirty-first technical means is the same as any one of the twenty-seventh technical means to the thirty-third technical means, and the control channel signal generated by the control channel signal generating means is OFCDM modulated.
- the signal is characterized in that it is a processed signal.
- control channel signal generating means comprises: code rate means using a low-rate block code; And means for arranging so as to be transmitted using a plurality of subcarriers.
- the thirty-third technical means includes any one of the twenty-seventh technical means to the thirty-second technical means, and control channel signal processing means for demodulating control channel data from the control channel signal; Traffic channel signal processing means for demodulating traffic channel data by OFCDM demodulating the traffic channel signal, and demodulating the control channel signal, and generating a duplicate of the control channel signal multiplexed with the received signal from the demodulated signal And control channel canceller means including means for removing received signal power control channel signal components.
- control channel canceller means demultiplexes the control channel symbol power received signal obtained by the judging means for demodulating the control channel signal and judging the signal point.
- the control channel signal is duplicated and the received signal power is removed from the control channel signal component, and then the traffic channel signal is demodulated.
- the thirty-fifth technical means is the control means according to the thirty-third technical means, wherein the control channel canceller means demodulates the control channel signal and decodes it by the error correction code decoding means. A duplicate of the control channel signal multiplexed with the received signal is generated, and the received signal power is also demodulated for the traffic channel signal after removing the control channel signal component.
- the thirty-sixth technical means is that in the thirty-fourth technical means or thirty-fifth technical means, the control channel canceller means has been in the past. From the control information obtained at that time, the traffic channel is addressed to the local station. When the traffic channel includes information addressed to the local station, a duplicate of the control channel signal multiplexed with the received signal is generated, and the received signal power also removes the control channel signal component. This is characterized in that the traffic channel signal is demodulated later.
- the thirty-seventh technical means is the control means according to the thirty-third technical means, wherein the control channel canceller means demodulates the control channel signal, and the judgment means judges the signal point, thereby obtaining the control channel symbol power.
- Generate a duplicate of the control channel and control it from the received signal Canceling (1) means for removing channel signal components, and control channel data power obtained by demodulating and decoding the control channel. A replica of the control channel multiplexed with the received signal is generated, and the received signal power is generated. Canceling to remove control channel signal components
- the present invention is characterized in that the demodulation processing of the tsuk channel is performed.
- the thirty-eighth technical means is the thirty-third technical means, wherein the control channel canceller means receives a signal in which the traffic channel and the control channel are multiplexed, and demodulates and determines the control channel.
- Control channel symbol power generated Canceling (1) means for generating a copy of the control channel signal multiplexed on the received signal and removing the received signal power control channel signal component, and the traffic channel and control channel are multiplexed.
- Control channel obtained by demodulating and decoding the control channel Data power Cancellation by generating a duplicate of the control channel multiplexed with the received signal and removing the control channel signal component from the received signal (2) Only one of the two canceling means of the means is provided, and the communication path The quality is obtained by the features that you demodulates the traffic channel by selecting either whether or not to execute the wire carrier Nseringu.
- the thirty-ninth technical means is a receiving apparatus that receives a signal transmitted by the transmitting apparatus according to any one of the twenty-eighth technical means to the thirty-third technical means, wherein the traffic channel signal is an OFCDM Traffic channel signal processing means for demodulating traffic channel data, control channel signal processing means for demodulating control channel data from the control channel signal, control channel signal and traffic channel signal Switching means for switching time, frequency, or code so that either a signal that is not orthogonal to either frequency or code and a signal that is orthogonal to either time, frequency, or code can be demodulated, and the control channel is demodulated Control channel signal multiplexed from received symbol or received data to received signal
- a duplication unit that generates a replica, and control channel canceller means including a removal means for removing the control channel signal component from the received signal comprises a, if the signal of the control channel to the orthogonal Further, the traffic channel is demodulated as it is, and if the control channel is a signal that is not orthogonal
- the 40th technical means is a receiving apparatus that receives a signal transmitted by the transmitting apparatus in any one of the 28th technical means to the 30th technical means, wherein the traffic channel signal is OFCDM Traffic channel signal processing means for demodulating traffic channel data, control channel signal processing means for demodulating control channel data from the control channel signal, control channel signal and traffic channel signal Switching means for switching time, frequency, or code so that either a signal that is not orthogonal to either frequency or code and a signal that is orthogonal to either time, frequency, or code can be demodulated, and the control channel is demodulated Control channel signal multiplexed from received symbol or received data to received signal
- a control channel canceller means including a duplicating means for generating a duplicate of the received signal and a removing means for removing the control channel signal component from the received signal.
- the control channel canceller means comprises: Depending on whether the signal is not orthogonal, the signal duplicated by the duplicating means is used to determine whether or not to cancel the received signal power control channel by the removing means and select it to select the traffic channel. This is characterized by demodulation.
- Forty-first technical means uses orthogonal frequency division multiplexing (OFDM) technology, and a signal modulated by OFDM by OFDM technology is spread over a plurality of subcarriers and / or a plurality of OFDM symbols.
- a transmission device using a modulation method characterized by being a signal (OFCDM modulation) a traffic channel signal 1 generating means for generating traffic channel signal 1 by OFCD M modulating traffic channel data 1, and traffic channel 1 Compared with traffic channel data 1, traffic signal 2 is generated from traffic channel data 2 that is lower-speed traffic channel data.
- Switching means for obtaining is obtained by comprising: the transmitting signal generating means for generating a by connexion transmission signal to multiplex the traffic channel signal 1 and the traffic channel signal 2, the
- the switching means switches to a non-orthogonal signal when the quality of the communication path is good, and is orthogonal when the quality of the communication path is poor. It is characterized by switching to a signal.
- the forty-fourth technical means is the forty-second technical means, wherein the switching means is a signal orthogonal to a non-orthogonal signal according to the number of spreading codes currently used in the traffic channel 1 signal. It is characterized by switching between and.
- the forty-fifth technical means is any one of the forty-first technical means to forty-fourth technical means, wherein the traffic channel 2 signal generated by the traffic channel signal 2 generating means is OFCDM modulated.
- the signal is characterized in that it is a processed signal.
- the forty-sixth technical means is that in the forty-first technical means, the traffic channel signal 2 generating means includes code rate means using a low-rate block code, and a plurality of OFDM symbols having a single codeword. And means for arranging to be transmitted using the subcarriers.
- the forty-seventh technical means is a receiving device that receives a signal transmitted by the transmitting device in any one of the forty-first technical means to the forty-sixth technical means, Traffic channel 1 signal processing means that demodulates channel signal 1 by OFCDM demodulating channel signal 1 and traffic channel signal 2 is traffic that is low-speed traffic channel data compared to traffic channel data 1. Traffic channel 2 signal processing means for demodulating channel data 2, means for generating a duplicate of traffic channel signal 2 multiplexed with the received signal, means for removing traffic channel signal 2 components from the received signal And a traffic channel including 2 canceller means.
- Forty-eighth technical means is the traffic channel canceller based on traffic channel data 2 obtained by demodulating traffic channel 2 in the forty-seventh technical means and decoding by error correction code decoding means. By means, a duplicate of the traffic channel signal 2 multiplexed with the received signal is generated, and the signal component of the traffic channel 2 is removed from the received signal.
- the forty-ninth technical means uses the traffic channel canceller means by the traffic channel 2 symbol obtained by the judging means for demodulating the traffic channel signal 2 and judging the signal point in the forty-seventh technical means.
- a feature is that a duplicate of the traffic channel signal 2 multiplexed with the received signal is generated, and the component of the traffic channel signal 2 is removed from the received signal.
- the traffic channel canceller means demodulates the traffic channel 2 and the signal point is judged by the judging means.
- Canceling (1) means for generating a duplicate of the traffic channel signal 2 multiplexed from the symbol to the received signal and removing the component of the traffic channel signal 2 from the received signal; A duplicate of the traffic channel signal 2 multiplexed with the received signal is generated from the traffic channel data 2 obtained by decoding by the correction code decoding means, and the signal component of the traffic channel 2 is removed from the received signal.
- Canceling (2) means to cancel, depending on the quality of the communication path 1) means for canceling (2) means, and ⁇ means to execute the canceling-ring, is obtained by and performing demodulation of traffic channel 1 select the Zureka.
- the fifty-first technical means is the fifty-seventh technical means, wherein the traffic channel canceller means multiplexes the traffic channel 2 symbol obtained by demodulating and judging the traffic channel 2 into the received signal.
- Canceling (1) means to generate a duplicate of the traffic channel 2 signal and remove the traffic channel signal 2 component from the received signal, and traffic channel data 2 obtained by demodulating 'decoding traffic channel 2 2
- (2) means for generating a duplicate of the traffic channel 2 multiplexed on the received signal from the received signal and removing the component of the traffic channel signal 2 from the received signal, and either one of the two canceling means Only canceling means, depending on the quality of the communication path, Select either or force not to perform the packaging is obtained by and performing demodulation of traffic channel 1.
- a fifty-second technical means is a receiving device that receives a signal transmitted by a transmitting device in any one of the forty-second technical means to the forty-fourth technical means, and receives the traffic channel signal 1 Traffic channel 1 signal processing means for demodulating traffic channel data 1 by demodulating OFCDM, traffic channel 2 signal processing means for demodulating traffic channel data 2 by demodulating traffic channel signal 2, and traffic channel signal Switching between time, frequency, and code so that 1 and traffic channel signal 2 can be demodulated with either a signal that is not orthogonal to each other in time, frequency, or code and a signal that is orthogonal to each other in time, frequency, or code And a reception system obtained by demodulating the traffic channel signal 2 Traffic channel 2 canceller means including duplicating means for generating a duplicate of traffic channel signal 2 multiplexed on the received signal and removing means for removing traffic channel signal 2 components from the received signal If the traffic channel signal 2 is an orthogonal signal, the traffic channel data 1 is demodulated as it is, and the traffic channel signal 1
- the thirty-third technical means is a receiving device for receiving a signal transmitted by the transmitting device in any one of the forty-second technical means to the forty-fourth technical means, Traffic channel 1 signal processing means for demodulating traffic channel data 1 by OFCDM demodulating channel signal 1; Traffic channel 2 signal processing means for demodulating traffic channel data 2 and demodulating traffic channel data 2 Traffic channel signal 1 and traffic channel signal 2 can be demodulated in time, frequency, or so that they can be demodulated with either signals that are not orthogonal to each other in time, frequency, or code and signals that are orthogonal to each other in time, frequency, or code.
- a switching means for switching codes, a received symbol obtained by demodulating traffic channel signal 2 or a received data force, a duplicate means for generating a duplicate of traffic channel signal 2 multiplexed on the received signal, and a received signal Traffic channel signal 2 component removed
- a traffic channel 2 canceller means including a removal means for leaving, and the traffic channel 2 canceller means a signal duplicated by the duplication means depending on the quality of the communication channel and whether the signal is orthogonal or non-orthogonal.
- the fifty-fourth technical means includes any one of the transmitting device in any one of the twenty-seventh technical means to the thirty-second technical means, and any one of the thirty-third technical means to the thirty-eighth technical means.
- a data communication system comprising a receiving device in an operation means.
- the fifty-fifth technical means comprises: a transmitting device in any one of the twenty-eighth technical means to the thirty-first technical means; and a receiving device in the thirty-ninth technical means or the forty-first technical means.
- a data communication system including the data communication system.
- the fifty-sixth technical means includes the receiving device in any one of the forty-first technical means to the forty-sixth technical means, and the technical technique for any one of the forty-seventh technical means to the fifty-first technical means.
- a data communication system comprising a receiving device in an operation means.
- the fifty-seventh technical means includes the transmitting device in any one of the forty-second technical means to the forty-fifth technical means, and the one of the fifty-second technical means or the fifty-third technical means.
- a data communication system comprising a receiving device in the means [0078]
- a part of a plurality of subcarriers is assigned as a control channel as in SCS-MC-CDMA, a specific subcarrier cannot be used for data transmission.
- codes orthogonal to the traffic channel and control channel are assigned as in VSF-OFCDM, the code corresponding to the spreading factor cannot be assigned to the traffic channel. For example, if the traffic channel has a spreading factor of 8, even if the control channel is low and the spreading factor corresponding to the required transmission rate is 128, the traffic channel cannot be allocated with 7 codes and transmitted. The speed is reduced.
- the transmission device when OFCDM is used as the control channel, it is used in the traffic channel depending on the quality of the communication channel and the number of codes in use.
- OFCDM Orthogonal to the spreading code or using a non-orthogonal code, it becomes possible to transmit more efficiently.
- FIG. 1 is a block diagram of a transmitter according to Embodiment 1 of the present invention.
- FIG. 2 is a block diagram of a traffic channel signal generation unit and a control channel signal generation unit according to Embodiment 1 of the present invention.
- FIG. 3 is a block diagram of a control channel signal generation unit according to Embodiment 2 of the present invention.
- FIG. 4 is a block diagram of a control channel signal generator according to Embodiment 3 of the present invention.
- FIG. 5 is a block diagram of a transmitter according to Embodiment 4 of the present invention.
- FIG. 6 is a block diagram of a traffic channel signal control channel signal generation unit according to Example 4 of the present invention.
- FIG. 7 is a block diagram of a transmitter according to Embodiment 5 of the present invention.
- FIG. 8 is a block diagram of a traffic channel control channel signal generation unit according to Example 5 of the present invention.
- FIG. 9 is a block diagram of a receiver according to Embodiment 6 of the present invention.
- FIG. 10 is a block diagram of a control channel signal canceller according to Embodiments 6 and 7 of the present invention. It is.
- FIG. 11 is a block diagram of a receiver according to Embodiment 7 of the present invention.
- FIG. 12 is a block diagram of a control channel signal canceller according to Embodiments 7 and 9 of the present invention.
- FIG. 13 is a block diagram of a receiver according to Embodiment 8 of the present invention.
- FIG. 14 is a block diagram of a receiver according to Embodiment 9 of the present invention.
- FIG. 15 is a block diagram of a receiver according to Embodiment 10 of the present invention.
- FIG. 16 is a block diagram of a control channel signal canceller according to Embodiment 10 of the present invention. ⁇ 17] It is a flowchart of the receiver according to Embodiment 11 of the present invention.
- FIG. 18 is a flowchart of the receiver according to the twelfth embodiment of the present invention.
- FIG. 19 is a block diagram of a transmitter according to Embodiment 13 of the present invention.
- FIG. 20 is a block diagram of a traffic channel signal generation unit and a control channel signal generation unit of a transmitter according to Embodiment 13 of the present invention.
- FIG. 21 is a block diagram of a control channel signal generation unit of a transmitter according to Embodiment 14 of the present invention.
- FIG. 22 is a block diagram of a control channel signal generation unit of a transmitter according to Embodiment 15 of the present invention.
- FIG. 23 is a block diagram of a transmitter according to Embodiment 16 of the present invention.
- FIG. 24 is a block diagram of a traffic channel signal control channel signal generation unit of a transmitter according to Embodiment 16 of the present invention.
- FIG. 25 is a block diagram of a transmitter according to Embodiment 17 of the present invention.
- FIG. 26 is a block diagram of a traffic channel control channel signal generation unit according to Embodiment 17 of the present invention.
- FIG. 27 is a block diagram of a receiver according to Embodiment 18 of the present invention.
- FIG. 28 is a block diagram of a control channel signal canceller unit of a receiver according to embodiment 18 of the present invention.
- FIG. 29 is a block diagram of a receiver according to Embodiment 19 of the present invention.
- FIG. 30 shows a block of a control channel signal canceller unit of a receiver according to embodiment 19 of the present invention.
- FIG. 31 is a block diagram of a receiver according to embodiment 20 of the present invention.
- FIG. 32 is a block diagram of a receiver according to Embodiment 21 of the present invention.
- FIG. 33 is a block diagram of a receiver according to Embodiment 22 of the present invention.
- FIG. 34 is a block diagram of a control channel signal canceller unit of a receiver according to embodiment 22 of the present invention.
- FIG. 35 is a block diagram of a traffic channel signal generation unit, a control channel signal generation unit, and an orthogonal code generation unit of a transmitter according to Embodiment 23 of the present invention.
- FIG. 36 is a block diagram of a receiver according to Embodiment 24 of the present invention.
- FIG. 37 is a block diagram of a receiver according to Embodiment 25 of the present invention.
- FIG. 38 is a flowchart showing an operation flow of a receiver according to embodiments 20 and 21 of the present invention.
- FIG. 39 is a flowchart showing an operation flow of a receiver according to embodiments 20 and 21 of the present invention.
- FIG. 40 is a flowchart showing an operation flow of a receiver according to embodiment 25 of the present invention.
- FIG. 41 is a general OFDM block diagram.
- FIG. 42 is a diagram illustrating a guard interval of an OFDM signal.
- FIG. 43 shows a structure of an OFDM signal.
- FIG. 44 is a diagram showing a structure of an OFCDM signal.
- FIG.45 Block diagram of a general OFCDM.
- Traffic channel processing 41, 81, 87, 91, 92 , 141, 151, 20 1, 230, 230a, 230b, 236, 920a, 920b, 930, 970, 980, 1015, 1028, 111 3, 1213, 1320- SZP conversion, 44, 85, 97, 155, 204, 205, 232, 232a, 232b, 238, 924a, 924b, 933, 960, 974, 1019, 1032, 1117, 1128, 1216, 1221 ••• PZS conversion, 42, 83, 95, 143, 202a, 202b... Scramble 82, 88, 90, 93, 9 9, 142, 201a, 201b, 301, 401 ...
- Frequency domain spreading processing 43, 84, 96, 231, 23 la, 231b, 932-IFFT processing, 45, 86 , 98, 233, 233a, 233b- -Add GI, 89, 3 02 ...- MUX, 144 ... Channel estimation value multiplication, 94, 147, 148 ... +, 152, 202, 237, 9 21a, 921b, 971, 1016, 1029, 1114, 1214, 1330- FFT processing, 153, 203, 9 22a, 922b, 972, 1017, 1030, 1115, 1215 ... descramble, 108, 1350, 14 40 ... Orthogonal code generator, 109 ...
- Control channel data signal processor (2) 906, 952, 1014, 1 027, 1448 Traffic channel signal processing unit, 1360 Traffic data signal processing unit (2), 154, 272, 923a, 923b, 959, 973, 1018, 1031, 1116, 1127, 1220 ... frequency domain despreading processing 270a, 270b, 931a, 93 lb ... copy device.
- the user terminal In many wireless communication systems, in addition to traffic data exchanged between the user terminal and the other terminal, such as voice data, video data, and other packet data, the user terminal Control information exchanged with the system to operate on the wireless communication system and control information indicating attributes of traffic data to be transmitted are communicated.
- traffic data exchanged between the user terminal and the other terminal such as voice data, video data, and other packet data
- the user terminal Control information exchanged with the system to operate on the wireless communication system and control information indicating attributes of traffic data to be transmitted are communicated.
- traffic channel data and control channel data are separately encoded by FEC Encoders 1 and 5, interleaved by Interleave 6 and modulated by MOD 3 and 7, respectively.
- the traffic channel data symbol is converted into a traffic channel signal by the traffic channel signal generation unit 4, and the control channel symbol is converted into a control channel signal by the control channel signal generation unit 8. These signals are added together and transmitted.
- the traffic channel signal generation unit 4 in Fig. 2 (A) multiplies the cell-specific scrambling code (Scramble 42) after SZP conversion (serial parallel conversion) 41, and performs inverse fast Fourier transform processing (IFFT processing) 43. Do. Then, it is converted into a time signal sequence by PZS conversion (parallel serial conversion) 44, and a guard interval is given by Add GI45.
- Scramble 42 cell-specific scrambling code
- IFFT processing inverse fast Fourier transform processing
- control channel signal generation unit 8 in Fig. 2 (B) after SZP conversion 81, the control channel symbol is copied so that it is transmitted on a plurality of subcarriers, and the frequency is obtained by multiplying by the spreading code. Area diffusion processing 82 is performed. Thereafter, similarly to the traffic channel signal generation unit 4, the cell-specific scrambling code is multiplied (scramble 83), and the inverse fast Fourier transform process (IFFT process) 84 is performed. Furthermore, PZS conversion 85 is performed to make a time signal sequence, and a guard interval is given by Add GI86.
- SZP conversion 81 the control channel symbol is copied so that it is transmitted on a plurality of subcarriers, and the frequency is obtained by multiplying by the spreading code. Area diffusion processing 82 is performed. Thereafter, similarly to the traffic channel signal generation unit 4, the cell-specific scrambling code is multiplied (scramble 83), and the inverse fast Fourier transform process (IFFT process) 84 is performed. Furthermore, PZS conversion
- FIG. 1 and the traffic channel signal generator 4 in FIG. 2 are the same as those in the first embodiment, but this embodiment is different from the first embodiment in the configuration of the control channel signal generator 8.
- Figure 3 shows this part.
- the control channel symbols are distributed to the spread code one symbol at a time by the SZP conversion 87.
- the cell-specific scrambling code is multiplied and the inverse Fourier transform process (IFF Perform T processing) 84, and further pass the time signal sequence from 85 points and PZS conversion 85 points, and add a guard interval with Add GI86.
- the diffusivity can be increased as compared with the first embodiment. Since code multiplexing is performed as much as the spreading factor increases, the transmission rate of the control channel does not change. If the method of the second embodiment is used, the interference of the traffic channel force can be averaged by increasing the spreading factor. Moreover, the frequency diversity effect can be increased by spreading widely in the frequency domain.
- FIG. 1 shows the block diagram in FIG. 1 and the traffic channel signal generation unit 4 in FIG. 2 in this example.
- Figure 4 shows the configuration of the control channel signal generator 8 in this example.
- the control channel signal generator 8 distributes the control channel symbols to the spread code by the SZP conversion 87.
- SZP conversion is performed to perform frequency domain spreading (frequency domain spreading processing 90), and code multiplexing is performed by MUX89.
- the cell-specific scrambling code is multiplied (scramble 83), and the inverse fast Fourier transform process (IFFT process) 84 is performed.
- IFFT process inverse fast Fourier transform process
- the method of the third embodiment is considered as an intermediate method between the first and second embodiments.
- the configuration in Example 2 in which the spreading factor and the number of subcarriers are equal becomes complicated. Therefore, the method of Example 3 is effective in which the spread rate is increased to some extent to reduce the complexity while obtaining the interference averaging effect and the diversity effect.
- FIG. 5 is a block diagram of a transmitter according to the fourth embodiment of the present invention
- FIG. 6 is a block diagram for explaining in detail the traffic channel control channel signal generator shown in FIG. [0092]
- traffic channel data and control channel data are separately encoded by FEC Encoders 1 and 5
- Interleave and 6 are interleaved, and are modulated by MOD3 and 7, respectively.
- traffic channel symbols subjected to SZP conversion 91 and control channel symbols subjected to frequency domain spreading processing 93 after performing SZP conversion 92 The corresponding subcarrier components are added (+94), multiplied by the cell-specific scrambling code (scramble 95), and inverse Fourier transform processing (IFFT processing) 96 is performed. Then add a guard interval with Add GI98.
- FIG. 7 is a block diagram of a transmitter according to Embodiment 5 of the present invention
- FIG. 8 is a block diagram of a traffic channel control channel signal generation unit of this embodiment.
- the control channel data is directly input to the traffic channel control channel signal generation unit 9. Since the processing of the traffic channel data is the same as that in the fourth embodiment (FIG. 5), the repeated description is omitted.
- the control channel data is subjected to SZP conversion 92 and then subjected to frequency domain spreading processing 99.
- the S / P converted control channel data is block-encoded by a block encoder (Enc) and modulated as a subcarrier component by a modulator (MOD).
- the block encoder (Enc) is a block encoder that outputs an n-bit code word for k input information bits.
- n is desirably a divisor of the number N of subcarriers.
- the modulation scheme of each subcarrier is assumed to be BPSK
- the control channel data is serially parallel converted in k ⁇ N / n bit units in SZP conversion 92.
- the block encoder (Enc) placed in parallel performs the encoding process and outputs N bits.
- N bits are BPSK modulated as each subcarrier component and multiplexed with the traffic channel signal (+94). Further, in FIG. 8, the processing of the traffic channel signal is the same as that in the fourth embodiment (FIG. 6), and the repeated description is omitted.
- FIG. 9 is a block diagram showing a configuration of a receiver according to the sixth embodiment of the present invention.
- the received signal is a signal transmitted from a transmitter as shown in Embodiment 1 or Embodiment 4 via a wireless communication path.
- timing detection and channel estimation are performed by the timing detection Z channel estimation process 11, and the timing for extracting a received signal for performing FFT processing and the channel estimation value are obtained.
- the weighting coefficient to be multiplied to each subcarrier after FFT is determined.
- the weighting factor is a complex conjugate of the channel gain corresponding to the frequency component of each subcarrier of the channel, but the method of determining the weighting factor is not limited to this method.
- the channel estimation value is also used when the control channel signal canceller generates a copy of the control channel signal.
- the guard interval is removed from the received signal by Remove GI12, and it is stored in the memory 13, so that the control channel is demodulated first. Since the control channel is subjected to OFCDM modulation, which performs frequency-domain spreading, despreading processing is performed using the complex combination of spreading codes used for spreading and the weighting coefficient obtained in the timing detection Z channel estimation process 11. 15 is done.
- SZP conversion 151, FFT processing 152, descrambling 153, frequency domain despreading 154, and PZS conversion 155 are executed.
- control channel data is obtained via a demodulator (Demod) 16, a deinterleaver 17 and a decoder 18.
- control channel signal canceller unit 14 receives the received signal stored in the memory 13
- the power also removes the control channel signal component, and the OFDM demodulation processing 20 of the traffic channel is performed.
- SZP conversion 201, FFT processing 202, descrambling 203, and P / S conversion 204 are performed.
- the demodulator (Demo d) 21, the deinterleaver (Deinterleaver) 22, and the decoder (Decoder) 23 perform error correction decoding to obtain traffic channel data.
- the determined control channel symbol is subjected to SZP conversion 141 in the same manner as the control channel signal generation unit 8 in FIG. 2, and then copied so that the control channel symbol is transmitted by a plurality of subcarriers.
- Frequency domain spreading is performed by multiplying the code (frequency domain spreading processing 142), and further, a cell-specific scrambling code is multiplied (scramble 143).
- IFFT processing inverse fast Fourier transform processing
- PZS conversion 146 are performed to obtain the control channel. Get a replica of the time signal of the signal. By subtracting this duplicate signal from the received signal stored in the memory (+147), a received signal in which the control channel signal is canceled is obtained.
- FIG. 11 is a block diagram showing a configuration of a receiver according to the seventh embodiment of the present invention.
- the despreading process 15 is performed on the received signal from which the guard interval has been removed by Remove Gil 2.
- the received signal is subjected to SZP conversion 151, FFT processing 152 is performed, converted into each subcarrier component, and the signal at the time when descrambling 153 is performed is stored in the memory 13.
- the control channel signal is subjected to frequency domain despreading 154 and PZS conversion 155 as it is, and then a symbol is determined (Decisionl9).
- the control channel signal canceller 14 cancels the control channel signal in the frequency domain
- the traffic channel processing 20 performs PZS conversion 205, demodulates with Demod21, deinterleaves with Deinterleaver 22, and passes through the decoder (Decoder) 23. Output traffic channel data.
- Decoder decoder
- FIG. 12 is a diagram showing details of the control channel signal canceller unit 14 of FIG.
- SZP conversion 141 is performed on the determined control channel symbol
- frequency domain spreading 142 is performed by multiplying the spread code.
- the channel estimation value multiplication is performed by multiplying each subcarrier component by the channel estimation value obtained in the timing detection Z channel estimation processing 11.
- the signal (canceller) power stored in the memory 13 is also subtracted (+148) to obtain a received signal in which the control channel signal is canceled.
- FIG. 13 is a block diagram showing a configuration of a receiver according to the eighth embodiment of the present invention.
- timing detection and channel estimation are performed by the timing detection Z channel estimation processing 11, and the timing for extracting a reception signal for performing FFT processing and the channel estimation value are obtained. From this channel estimation value, the weighting factor by which each subcarrier is multiplied after FFT is determined.
- the guard interval is removed from the received signal by Remove GI12, and it is stored in the memory 13, so that the control channel is demodulated first. Since the control channel is subjected to OFCDM modulation, which performs frequency-domain spreading, despreading processing is performed using the complex combination of spreading codes used for spreading and the weighting coefficient obtained in the timing detection Z channel estimation process 11. 15 is done.
- SZP conversion 151, FFT processing 152, descrambling 153, frequency domain despreading 154, and PZS conversion 155 are executed.
- control channel data is obtained via a demodulator (Demod) 16, a deinterleaver 17 and a decoder 18.
- control channel data decoded by the decoder 18 is encoded again by the FEC Encoder 24, interleaved by the Interleaver 25, modulated by the MOD 26, and sent to the control channel signal canceller unit 14. Sent.
- the control channel signal canceller unit 14 is the same as the block shown in FIG. 10 described above, and after performing the S ZP conversion 141, the control channel symbol is copied so that it is transmitted on a plurality of subcarriers, and multiplied by a spreading code.
- frequency domain spreading is performed (frequency domain spreading processing 142), and further, a cell-specific scrambling code is multiplied (scramble 143).
- IFFT processing inverse Fourier transform processing
- PZS conversion 1 46 are performed to obtain the control channel signal. Get a replica of the time signal.
- FIG. 14 is a block diagram showing a configuration of a receiver according to the ninth embodiment of the present invention.
- the received signal from which the guard interval has been removed by Re move GI12 is subjected to despreading processing15, but here the received signal is subjected to SZP conversion 151, FFT processing 152 to convert each subcarrier component, and descrambling 153
- the signal at the time of performing is stored in the memory 13.
- the control channel signal is directly subjected to frequency domain despreading 154 and PZS conversion 155. After despreading processing, control channel data is obtained through a demodulator (Demod) 16, a deinterleaver (Deinterlaver) 17, and a decoder (Decoder) 18.
- Demod demodulator
- Deinterlaver deinterlaver
- Decoder decoder
- control channel data decoded by the decoder 18 is again encoded by the FEC Encoder 24, interleaved by the Interleaver 25, modulated by the MOD 26, and the control channel signal canceller unit 14 Sent to.
- the control channel signal canceller unit 14 is the same as the block of FIG. 12 already described, and performs SZP conversion 141 on the determined control channel symbol, and performs frequency domain spreading processing 142 by multiplying by the spreading code. Then, after performing channel estimation value multiplication 144 that multiplies each subcarrier component by the channel estimation value obtained in the timing detection Z channel estimation processing 11, the signal is stored in the memory 13 and the signal at the time of descrambling (canceller) ) Subtract the force (+148) to obtain the received signal with the control channel signal canceled.
- FIG. 15 is a block diagram showing a configuration of a receiver according to the tenth embodiment of the present invention, and shows an embodiment of a receiver corresponding to the transmitter of the fifth embodiment.
- FIG. 16 is a block diagram of the control channel signal canceller unit of this embodiment. As shown in FIG. 15, in the receiver of this embodiment, the received signal from which the guard interval has been removed by Remove GI12 is subjected to SZP conversion 151, and then converted to each subcarrier component by FFT processing 152. The signal at the time of descrambling 153 is stored in the memory 13.
- each subcarrier component is demodulated by a demodulator (Demod) 156
- a decoding process of a block code is performed by a decoder (Decoder) 157
- control channel data is obtained by performing PZS conversion 155.
- each OFDM symbol is demodulated and converted into time-series data by PZS conversion, and then in units of frames.
- Power required to decode In this embodiment, a block code having a code length equal to or less than the number of subcarriers is used, so that decoding processing can be performed in units of OFDM symbols.
- the decoded control channel data is sent to the control channel signal canceller 14, the control channel signal component is canceled from the received signal stored in the memory 13, P / S conversion 205 is performed in the traffic channel processing 20, and Demod 21 Demodulate, deinterleaver 22 performs deinterleave, decodes by decoder 23, and outputs the traffic channel data.
- the decoded control channel decoded data is encoded again by the encoder (Enc) 145, and for each subcarrier by the modulator (Mod) 146. After modulation, a channel estimate multiplication 144 is performed to obtain a duplicate of the control channel signal. The signal power after descrambling stored in the memory 13 is also subtracted (+148), and a canceller output signal is obtained.
- FIG. 17 is a flowchart for extracting traffic channel signals only when the obtained control information power traffic channel is found to contain information addressed to the local station.
- This flowchart applies to the block diagram of FIG. 13 or the block diagram of FIG.
- the signal stored in the memory and canceling is different in the case of Fig. 13 and Fig. 14, but the control flow is the same, and the information addressed to the local station is sent to the traffic channel of the received received frame. Whether or not it is included is determined, and only when the information addressed to itself is included, the subsequent re-encoding interleaving / modulation, control channel cancellation, and traffic channel reception processing are performed.
- a signal is received (step SI), and the guard interval is removed from the received signal (step S2).
- step S3 SZP conversion, FFT, and descrambling are performed (step S3), and frequency domain despreading is performed (step S4).
- control channel demodulation, dinter leave, and decoding are performed (step S5).
- the guard interference is removed in step S2, and then stored in the received signal memory (step S11).
- the received signal is stored in the memory (step S12).
- step S6 it is determined from the decoded control information whether or not traffic channel data addressed to itself is included in the received frame. If the traffic channel data addressed to itself is included, the control channel data is re-encoded, interleaved and modulated (step S7). Then, the control channel is canceled (step S8), and the traffic channel is processed (step S9). If the traffic channel addressed to itself is not included in the received frame in step S6, the process is terminated (step S10).
- Fig. 18 is also a flowchart for extracting the traffic channel signal only when the obtained control information power is found to contain information addressed to the local station.
- This flow chart applies to the block diagram of FIG. 13 or the block diagram of FIG.
- the signals that are stored in the memory and processed for cancellation are different in the cases of Fig. 13 and Fig. 14.
- the flow of control is the same, and the decoded control information power. Is included, and the process proceeds to the next determination only when information addressed to the own station is included.
- a signal is received (step S21), and the received signal strength guard interval is removed (step S22). Then, SZP conversion, FFT, and descrambling are performed (step S23), and frequency domain despreading is performed (step S24). In addition, control channel demodulation, dinter leave, and decoding are performed (step S25).
- the guard interval is removed in step S22, and then stored in the received signal power S memory (step S32).
- descrambling is performed in step S23, and then stored in the received signal strength S memory (step S33).
- step S26 If traffic channel data is included (step S26), the process proceeds to the next determination block, step S27. If not included, the process ends (step S31).
- step S27 it is determined whether or not the SNR is sufficiently high. In other words, the channel state information measured by the channel estimation unit, the modulation included in the control channel, the coding parameters, etc., and whether the traffic channel data can be output correctly without canceling the control channel signal. Decide whether to cancel. If the channel quality is sufficiently high, the control channel re-encoding / interleaving / modulation / control channel cancel processing is omitted and the traffic channel processing is performed (step S30). Outputs the input from the memory as it is to the traffic channel processing unit. If the channel quality is not sufficiently high, control channel re-encoding, interleaving, and modulation processing are performed (step S28), and control channel cancellation processing (step S29) is performed to perform traffic channel processing. (Step S30).
- the traffic channel is the traffic channel 1 that communicates high-speed data
- the control channel is the low-speed data.
- the signal transmitted from the transmitter as shown in the first or fourth embodiment is received via the wireless communication path.
- a signal using code multiplexing for the control channel can be configured in the same manner, and the scope of the present invention is limited to a receiver corresponding to the control channel using a single code. Well then.
- the OFCDM using the frequency domain spreading has been described.
- the OFCDM that performs two-dimensional spreading in the time domain and the frequency domain or the OF CDM that performs spreading in the time domain may be used.
- the same effect can be obtained, and the OFCDM described in the claims of the present invention is not limited to the OFCDM using frequency domain spreading.
- FIG. 19 is a block diagram of a transmitter according to Embodiment 13 of the present invention.
- the same reference numerals are assigned to the portions overlapping with FIG. 41 to FIG. 45 (conventional example).
- the user terminal In many wireless communication systems, in addition to traffic data such as voice data, video data, and other packet data exchanged between the user terminal and the other terminal, the user terminal operates on the wireless communication system. Control information exchanged with the system and control information indicating attributes of traffic data to be transmitted are communicated.
- traffic channel data and control channel data are separately encoded by FEC Encoder10 and 104, interleaved by Interleaverl01 and 105, and modulated by MOD102 and 106, respectively.
- the traffic channel data symbols are converted into traffic channel signals by the traffic channel signal generation unit 103, and the control channel symbols are converted into control channel signals by the control channel signal generation unit 107. These signals are added together and transmitted.
- FIG. 20 is a block diagram of a traffic channel signal generation unit and a control channel signal generation unit of the transmitter according to Embodiment 13 of the present invention.
- frequency domain spreading processing section 201a transmits traffic channel symbols so as to be transmitted by a plurality of subcarriers. And multiply by spreading code (C, C, C, C)
- frequency domain spreading processing is performed.
- the cell-specific scrambling code is multiplied (scrambled), and inverse fast Fourier transform processing 231a (IFFT processing) is performed.
- IFFT processing inverse fast Fourier transform processing
- P, S conversion 232a parallel serial conversion
- GI240 is given by AddGI233a.
- control channel signal generation unit 107 in FIG. 20 (b) also copies the control channel symbol so that it is transmitted on a plurality of subcarriers after the SZP conversion 230b, By multiplying the spreading code (C, C, C, C), the frequency
- the traffic channel spreading codes (C, C, C, C) and the control channel extension are used.
- the spread codes (c 1, c 2, c 3, c 4) are codes that are not orthogonal to each other. This implementation In the example, both the traffic channel signal and the control channel signal are spread with a spreading factor of 4, but they may be spread with different spreading factors.
- Embodiment 14 of transmission signal generation using a control channel generation method different from that of Embodiment 13 will be described below.
- the present embodiment is common to the configuration of the thirteenth embodiment shown in Figs. 19 and 20, but the configuration of the control channel signal generation unit 107 is different. The configuration of this part is shown in FIG.
- control channel symbols are distributed one symbol at a time to the spreading code by SZP conversion 230b.
- Each spreading code (C, C) is
- frequency domain spreading 301 of spreading factor N frequency domain spreading processing
- code multiplexing with MUX 302.
- the cell-specific scrambling code is multiplied and the inverse Fourier transform process (IFFT process 23 lb) is performed.
- IFFT process 23 lb inverse Fourier transform process
- PZS conversion 232b makes the time signal sequence
- AddGI233b gives GI240.
- the spread codes (c, c, ', c) are non-orthogonal codes. However,
- control channel spreading codes are orthogonal to each other. In the embodiment described above, only one traffic channel is generated. However, when there are a plurality of traffic channels, orthogonal codes are used for the respective traffic channel spreading codes.
- the diffusivity can be increased as compared with the thirteenth embodiment. Since code multiplexing is performed as much as the spreading factor increases, the transmission rate of the control channel does not change.
- the interference caused by traffic channel power can be averaged by increasing the spreading factor.
- the frequency diversity effect can be increased by spreading widely in the frequency domain.
- Embodiment 15 of transmission signal generation using a control channel generation method different from those of Embodiment 13 and Embodiment 14 will be described below.
- the traffic shown in FIGS. This is the same as the basic block diagram shown in the channel signal generator, and the control channel signal generator in FIG. 20 has a different configuration.
- FIG. 22 shows the configuration of the control channel signal generation unit 400 of this embodiment.
- Control channel signal generation section 400 distributes control channel symbols to spreading codes by SZP conversion 230b. After that, SZP conversion is performed to perform frequency domain spreading (frequency domain spreading processing 401), and MUX 302 performs code multiplexing. After that, the cell-specific scrambling code is multiplied (scrambled), and the inverse fast Fourier transform processing (? Processing 2311)) is performed. Furthermore, after making the time signal sequence by PZS conversion 232b, GI240 is given by Add GI233b.
- Example 14 When the number of subcarriers increases, the configuration in Example 14 in which the spreading factor and the number of subcarriers are equal becomes complicated. Therefore, there are cases where the present embodiment is effective in which the spreading factor is increased to some extent to reduce the complexity while obtaining the interference averaging effect and the diversity effect.
- This example is an intermediate configuration between Example 13 and Example 14 in the above sense.
- FIG. 23 is a block diagram of a transmitter according to Embodiment 16 of the present invention
- FIG. 24 is a block diagram for explaining in detail the traffic channel control channel signal generator shown in FIG.
- the traffic channel data and control channel data are separately encoded by FEC EncoderlOO and 104, interleaved by InterleaverlOl and 105, and modulated by MOD102 and 106, respectively. Is input to the traffic channel control channel signal generation unit 500.
- traffic channel control channel signal generation section 500 performs traffic channel symbols after frequency domain spreading processing 20 la after SZP conversion, and frequency domain spreading processing after SZP conversion.
- the subcarrier components corresponding to the control channel symbols subjected to 201b are respectively added by the adder 501 and multiplied by the cell-specific scrambling code (scramble 202b), and the inverse Fourier transform process (IFFT process 231) Perform b), convert to a time signal sequence with PZS conversion 232b, and then add GI240 with Add GI233b.
- IFFT process 231 inverse Fourier transform process
- FIG. 25 is a block diagram of the transmitter of the communication system according to Embodiment 17 of the present invention.
- FIG. 6 is a block diagram of the traffic channel control channel signal generation unit of the present embodiment.
- the control channel data is directly input to the traffic channel control channel signal generation unit 700. Since the processing of the traffic channel data is the same as that of the above embodiment 16 (shown in FIG. 23), repeated explanation is omitted.
- the traffic channel symbol is subjected to SZP conversion 230a and then subjected to frequency domain spreading processing 20la.
- the control channel data subjected to the SZP conversion 230b is block-encoded by a block encoder 701 (Enc) and modulated as a subcarrier component by a modulator 702 (MOD).
- the block encoder 701 is a block encoder that outputs an n-bit code word for k input information bits.
- n is preferably a divisor of the number N of subcarriers. Assuming that n is a divisor of N and the modulation scheme of each subcarrier is assumed to be BPSK, the control channel data is serially parallel converted in k'NZn bit units in SZP conversion.
- N bits are BPSK modulated as respective subcarrier components and multiplexed with a traffic channel signal by an adder 501.
- the processing of the traffic channel signal is the same as that in the above-described embodiment 16 (see FIG. 24), and thus the repeated description is omitted.
- FIG. 27 is a block diagram showing the configuration of the receiver of the communication system according to Embodiment 18 of the present invention.
- the signal received by the receiver described in the present embodiment is a signal transmitted from a transmitter as shown in the embodiment 13 or the embodiment 16 and received through a wireless communication path.
- the weighting factor Wi * is a complex conjugate of the channel gain corresponding to the frequency component of each subcarrier of the channel, but the method of determining the weighting factor Wi * is not limited to this method.
- the channel estimation value is also used when the control channel signal canceller section 905 generates a duplicate of the control channel signal.
- GI240 is removed from the received signal by Remove GI901 and stored in the memory, and then the control channel signal is demodulated first.
- the control channel signal processing unit 903 since the control channel signal is subjected to OFCDM modulation for performing frequency domain spreading, the complex conjugate of the spreading code used for spreading (C *, C *, C *, C *) And timing detection
- the frequency despreading process 92 3a is performed using the weighting coefficient Wi * obtained in the Z channel estimation process 900.
- SZP conversion 920a, FFT processing 921a, descrambling 922a, frequency domain despreading processing 923a, and PZS conversion 924a are executed.
- control channel data is obtained through a demodulator 908 (Demod), a dintarino 909 (Deinterleaver), and a decoder 910 (Decoder).
- control channel signal canceller 905 creates a copy of the control channel signal and stores it in the memory 904 for the received signal count.
- control channel signal component is removed.
- the traffic channel signal processing unit 906 the signal from which the control channel signal component has been removed, that is, the traffic channel signal component is subjected to OFCDM modulation for performing frequency domain spreading.
- Detection ⁇ ⁇ Frequency domain despreading processing 923b is performed using the weighting factor wi * obtained in the channel estimation processing.
- SZP conversion 920b, FFT processing 921b, descrambling 922b, frequency domain despreading processing 923b, PZS conversion 924b force S is performed.
- Demodulator 911 (Demod), Dinterleaver 912 (Deinterleaver), Decoder 913 (Decod er) performs error correction decoding and obtains traffic channel data.
- FIG. 28 is a configuration diagram showing a detailed configuration of the control channel signal canceller unit.
- Control channel symbols determined by decision 907 shown in FIG. 27 are subjected to SZP conversion 930 in the same manner as control channel signal generation section 107 in FIG. 20, and then control channel symbols are transmitted on a plurality of subcarriers.
- Copy and spread code (C, C, C,
- FIG. 29 is a block diagram showing a configuration of the receiver according to Embodiment 19 of the present invention.
- FIGS. 27 and 28 the embodiment in which the received signal power control channel signal is canceled with a time domain signal has been described. However, as shown in FIGS. 29 and 30, canceling is performed for each subcarrier in the frequency domain. It is also possible to do this.
- the received signal from which the guard interval has been removed by Remove GI950 is subjected to frequency despreading processing by traffic channel signal processing section 952.
- the received signal is subjected to SZP conversion 970, FFT processing 971 is performed, converted into subcarrier components, and the signal at the time of descrambling 972 is stored in the memory 956.
- the control channel signal is directly subjected to frequency domain despreading 973 and PZS conversion 974, followed by symbol determination 955 (Decision 955).
- the control channel signal canceller 957 cancels the control channel signal in the frequency domain.
- the traffic channel signal processor 1 (958) performs frequency domain despreading processing 959, performs PZS conversion 960, demodulates with Demod96 1, deinterleaves with Deinterleaver 962, and passes traffic channel data through Decoder 962. Output. Other functions similar to those in FIG. 27 are not described repeatedly.
- FIG. 30 is a detailed block diagram of control channel signal canceller section 957 shown in FIG.
- the determined control channel symbol is subjected to SZP conversion 980 and multiplied by spreading codes (C 1, C 2, C 3, C 4) to perform frequency domain spreading. And timing check
- the signal (canceller) power stored in the memory 956 is also subtracted and controlled. Get the received signal with the channel signal canceled
- FIG. 31 is a block diagram showing a configuration of the receiver according to Embodiment 20 of the present invention.
- timing detection and channel estimation are performed by the timing detection Z channel estimation processing 1010, and the timing for extracting the received signal for performing the FFT processing and the channel estimation value are obtained. From this channel estimation value, the weighting coefficient to be multiplied to each subcarrier after FFT processing 1016 is determined.
- the guard interval is removed from the received signal by Remove GI 1011 and is stored in the memory 1012, and the control channel is demodulated first.
- the control channel data signal processing unit 1014 since the control channel signal is subjected to OFCDM modulation for performing frequency domain spreading, the complex conjugate (C *, C *, C *) of the spreading code used for spreading is used.
- a frequency domain despreading process 1018 is performed.
- SZP conversion 1015, FFT processing 1016, descrambling 1017, frequency domain despreading processing 1018, and PZS conversion 1019 are executed.
- control channel data is obtained through a demodulator (Demod) 1020, a deinterleaver 1021, and a decoder 1022.
- Demod demodulator
- control channel data decoded by the decoder 1022 is encoded again by the FEC Encoder 1023, interleaved by the Interleaverl025, modulated by the MOD 1026, and the control channel signal canceller unit. Sent to 1013.
- Control channel signal canceller section 1013 is the same as the block of Fig. 28 already described. .
- FIG. 28 is used for explanation.
- control channel symbols are copied by the copiers 93 la and b so that they are transmitted by a plurality of subcarriers, and the spreading codes (C, C, C, C) are Multiplication
- CO CI C2 C3 performs frequency domain spreading (frequency domain spreading processing), and then multiplies by a cell-specific scrambling code (scramble).
- frequency domain spreading processing frequency domain spreading processing
- IFFT processing inverse Fourier transform processing
- PZS conversion 933 are performed to obtain the control channel signal.
- the time of getting a signal replica By subtracting this duplicate signal from the received signal stored in the memory, a subtractor 934 obtains a received signal in which the control channel signal is canceled.
- the generated reception signal is subjected to OFCDM demodulation processing by the traffic channel signal processing unit 1027.
- SZP conversion 1028, FFT processing 1029, descrambling 1030, frequency domain despreading processing 1031, and PZS conversion 1032 force S are performed.
- traffic channel data can be obtained by performing error correction decoding with a demodulator (Demod) 1033, a deinterleaver (Deinterleaver) 1034, and a decoder (Decoder) 1035.
- FIG. 32 is a block diagram showing a configuration of the receiver according to Embodiment 21 of the present invention.
- the received signal from which the guard interval is removed by the Removve Gil 110 is subjected to frequency despreading processing by the control channel signal processing unit 1112.
- the received signal is subjected to SZP conversion 1113, FFT processing 1114, and so on.
- a signal at the time of descrambling 1115 after being converted to a subcarrier component is stored in the memory 1124.
- the control channel signal is directly subjected to frequency domain despreading processing 1116 and PZS conversion 1117.
- control channel data is obtained through a demodulator (Demod) 111 8, a deinterleaver 1119, and a decoder 1120.
- Demod demodulator
- control channel data decoded by the decoder 1120 is encoded again by the FEC encoder 121 and interleaved by the interleaver 1122. , Modulated by MOD 1123 and sent to the control channel signal canceller 1125.
- Control channel signal canceller section 1125 is the same as the block of Fig. 30 already described.
- control channel symbol modulated by MODI 123 is subjected to SZP conversion 980 and multiplied by spreading codes (C 1, C 2, C 3, C 4) to perform frequency domain spreading processing. And Thailand
- Detecting the signal After performing channel estimation value multiplication by multiplying the channel estimation value obtained in the channel estimation processing by each subcarrier component, it is stored in the memory and subtracted from the signal (canceller) at the time of descrambling to control Receive signal with channel signal canceled.
- FIG. 33 is a block diagram illustrating a configuration of a receiver according to Embodiment 22 of the present invention, and is a block diagram illustrating a configuration of a receiver corresponding to the transmitter according to Embodiment 17 described above.
- FIG. 34 is a block diagram of the control channel signal canceller unit of the present embodiment.
- the received signal from which the guard interval has been removed by Remove GI1210 is subjected to SZP conversion 1213 by the control channel data signal processing unit 1212.
- the signal is converted into each subcarrier component by the FFT processing 1214, and the signal at the time of descrambling 1215 is stored in the memory 1217.
- a demodulator demodulator
- Decoder decoder
- control channel data is obtained by performing PZS conversion 1216.
- each OFDM symbol is demodulated and converted into time-series data by PZS conversion after decoding, and decoded in frame units.
- decoding processing can be performed in units of OFDM symbols.
- the decoded control channel data is sent to the control channel signal canceller unit 1218.
- the received signal power stored in the memory 1217 is also canceled by the control channel signal component.Further, the traffic channel processing 1219 performs frequency domain despreading processing 1220, performs PZS conversion 1221, demodulates by Demodl222, and deinterleaves by Deinterleaverl223. And decoding with Decoder 224 to obtain traffic channel data.
- control channel signal canceller section 1218 the decoded control channel decoded data is encoded again by encoder (Enc) 1225 and subcarrier by modulator (Mod) 1226 After each modulation, a channel estimate multiplication is performed to obtain a duplicate of the control channel signal. This is subtracted from the signal force after descrambling stored in the memory 1217 to obtain a canceller output signal.
- FIG. 35 is a block diagram of a control channel signal generator and a traffic channel signal generator of the transmitter according to Embodiment 23.
- the present embodiment has a configuration in which an orthogonal code generation unit 108 indicating the features of the present embodiment is added to the control channel signal generation unit 103 and the traffic channel signal generation unit 107 of the thirteenth embodiment.
- the present embodiment has the same configuration as that of the thirteenth embodiment except that a spread code (code) switching function is provided.
- code generation unit exists also in the case of the embodiment 13. If the control channel signal and the traffic channel signal are not orthogonal to each other, only the code V is used and the description is omitted.
- the control channel signal generation unit 103 and the traffic channel signal generation unit 107 in FIG. 35 have the same configuration as that of the thirteenth embodiment, and thus the description thereof is omitted.
- the orthogonal code generator 108 includes an orthogonal code generator 1 (109), an orthogonal code generator 2 (110), an orthogonal code generator 1 (109), and an orthogonal code generator 2 (110) that generate a plurality of orthogonal codes. It consists of a code switch 111 that switches between. However, the code generated from the orthogonal code generator 1 (109) and the code generated from the orthogonal code generator 2 (110) are non-orthogonal to each other.
- the code used for the traffic channel signal only the code generated by the orthogonal code generator 1 (109) is used.
- the code used for the control channel signal is switched to the orthogonal code generator 2 (110) by switching the code switch 111 to the orthogonal code generator 2 (110) side when the quality of the communication channel is good.
- the code generated by the orthogonal code generator 1 (109) is used by switching the code switch 111 to the orthogonal code generator 1 (109) side. If there are multiple control channels or traffic channels, for example, select the orthogonal code or non-orthogonal code by the channel through the worst channel, or average the level of each of the multiple channels If you judge the power, etc.
- orthogonal / non-orthogonal determination is performed according to the quality of the communication channel, but the codes generated by the orthogonal code generator 1 (109) are sufficient as codes used for the control channel signal. If it is in the state, use the code generated by the orthogonal code generator 1 (109) .If there is not enough, switch the code switch 111 to the orthogonal code generator 2 (110) side to generate the orthogonal code. It is also possible to use the code generated by device 2 (110). However, if non-orthogonal codes are used in this case, the reception quality will be degraded compared to when orthogonal codes are used, so it is necessary to transmit at a slightly higher transmission level than when orthogonal codes are used. is there.
- only the control channel signal can be switched between the orthogonal code generators 1 (109) and 2 (110), and only the traffic channel signal is converted into the orthogonal code generator 1. It is also possible to adopt a configuration capable of switching 2 or a configuration capable of switching between the orthogonal code generator 1 (109) and the orthogonal code generator 2 (110) for both the control channel signal and the traffic channel signal. For example, it is effective when you want to fix the control channel code.
- FIG. 36 is a block diagram showing a configuration of the receiver according to Embodiment 24 of the present invention.
- the signal received from the transmitter as described in Example 24 is received via a wireless communication path.
- the spreading code for the control channel signal a code that is not orthogonal to the spreading code used in the traffic channel signal when the quality of the communication channel is good is used.
- the orthogonal code is used in the worst case The configuration of the receiver is shown. For this reason, in particular, the receiver does not have the control channel signal canceller described above.
- timing detection and channel estimation are performed by the timing detection Z channel estimation processing 1300, and the timing for extracting the reception signal for performing the FFT processing 1330 and the channel estimation value are obtained.
- the guard interval is removed from the received signal by Remove GI1310, and SZP conversion 1320 and FFT processing 1330 are performed.
- the control channel and the traffic channel are separately detected and processed by the control channel data signal processing unit (2) (1340) and the traffic data signal processing unit (2) (1360).
- control channel signal is subjected to OFCDM modulation that performs frequency domain spreading
- the frequency despreading process is performed using the weighting coefficient obtained in the CO CI C2 C3 Z channel estimation process.
- descrambling, frequency domain despreading, and PZS conversion are performed.
- the complex conjugate (c *, c *, c *, c *) of the spreading code used for spreading is the code switch
- the code switch is connected to the orthogonal code generator 1 when the control channel is spread with a code orthogonal to the traffic channel, and the orthogonal code generator 2 when the control channel is spread with a code that is not orthogonal. Switch to.
- control channel data is obtained via a demodulator (Demod) 1361, a deinterleaver (Deinterleaver) 1362, and a decoder (Decoder) 1363.
- a despreading process is performed.
- descrambling, frequency domain despreading, and PZs conversion are performed.
- the complex conjugate of the spreading code used for spreading (c *,
- Traffic channel data is obtained through a modulator 1364, a deinterleaver 1365, and a decoder 1366.
- FIG. 37 is a block diagram showing a configuration of the receiver according to Embodiment 25 of the present invention.
- the signal received from the transmitter as shown in Embodiment 24 (see FIG. 35) is received via a wireless communication path.
- the receiver has a canceller.
- the control channel spreading code is not orthogonal to the traffic channel spreading code, it is possible to demodulate the traffic channel signal after canceling the received signal strength of the control channel signal by the canceller. Better reception is possible.
- timing detection and channel estimation are performed by the timing detection Z channel estimation process 1400, and the timing for extracting a received signal for performing FFT processing and the channel estimation value are obtained. From this channel estimation value, the weight coefficient to be multiplied to each subcarrier after FFT processing is determined.
- the guard interval is removed from the received signal by Remove GI 1410, and is stored in the memory 1420.
- the control channel data signal processing unit 1430 first detects the control channel signal. Since the control channel signal is subjected to OFCD M modulation that performs frequency domain spreading, the complex conjugate of the spreading code used for spreading (C *, C *,
- C2 c * C3 and timing detection despreading processing is performed using the weighting factor obtained in the Z channel estimation processing.
- SZP conversion, FFT processing, descrambling, frequency domain despreading, and PZS conversion are performed.
- the orthogonal code generation unit 1440 is the same as that of the embodiment 24, and the complex conjugate (C *, C *, C *) of the spreading code used for spreading is used.
- control channel data is obtained through a demodulator (Demod) 1441, a deinterleaver (Deinterleaver) 1442, and a decoder (Decoder) 1443.
- Demod demodulator
- Deinterleaver deinterleaver
- Decoder decoder
- the control channel canceller 1447 outputs the input from the memory 1420 to the traffic channel signal processor 1448 as it is. To do thus, the traffic channel is detected (demodulated) without canceling the control channel. That is, OFCDM demodulation processing of the traffic channel is performed.
- SZP conversion, FFT processing, descrambling, frequency domain despreading, and PZS conversion are performed.
- error correction decoding is performed using a temonrator (Demod), a tintarino (deinterleaver), and an coder (.Decoder) to obtain traffic channel data.
- the control channel signal is canceled from the received signal and the traffic channel is demodulated.
- control channel signal canceller unit 1447 is the same as the block in FIG. 28 described above, and after performing the SZP conversion, copies the control channel symbol so that it is transmitted on a plurality of subcarriers, and spread codes (C, C, C, C
- traffic channel data is obtained from the received signal by performing the demodulation process of the traffic channel as described above.
- the control channel signal is reproduced from the control channel data.
- the control channel signal may be reproduced from the control channel symbol before Demodl441.
- canceling is performed for each subcarrier in the frequency domain after FFT processing that is canceling in the time domain before SZP.
- FIG. 38 is a flowchart showing a process for extracting a traffic channel signal when it is determined that the obtained control information power traffic channel includes information addressed to the local station.
- the signal stored in the memory (1012 or 1124) and processed for canceling differs between the case of FIG. 31 and the case of FIG. 32, but the control flow is the same. That is, it is determined whether or not the information addressed to the local station is included in the traffic channel of the decoded control information received frame, and only when the information addressed to the local station is included, subsequent re-encoding 'interleaved' modulation and control Performs channel cancellation and traffic channel reception processing.
- a signal is received (step SO), and the guard interval is removed from the received signal by Remove GI. Then, SZP conversion, FFT processing, and descrambling processing are performed (step S2), and frequency domain despreading processing is performed (step S3). In addition, control channel demodulation, dinter leave, and decoding are performed (step S4).
- the received signal is stored in memory 1012 after the guard interval is removed.
- the received signal is stored in memory 1124.
- step S5 it is determined from the decoded control channel information whether or not traffic channel data addressed to itself is included in the received frame. If traffic channel data addressed to itself is included (step S5; YES), control channel data is re-encoded, interleaved and modulated (step S6). Then, the control channel is canceled and the traffic channel is processed (step S8). If the traffic channel addressed to itself is not included in the received frame (step S5; NO), the process ends.
- FIG. 5 is a flow diagram for extracting traffic channel signals only when it is found to contain.
- the signals stored in the memory and processed for cancellation differ in the case of Fig. 31 and in the case of Fig. 32, but the control flow is the same, and the decoded control information power
- the information addressed to the local station in the traffic channel of the received frame The process proceeds to the next determination only when information addressed to the local station is included.
- a signal is received (step S 10), and the received signal strength guard interval is removed (step Sl l). Then, SZP conversion, FFT, and descrambling are performed (step S12), and frequency domain despreading is performed (step S13). In addition, control channel demodulation, dinter leave, and decoding are performed (step S14).
- the guard interval is removed and then stored in the received signal memory. In the configuration of FIG. 32, after descrambling, the received signal is stored in the memory.
- step S16 If the traffic channel data is included, it is determined whether or not the SNR is sufficiently high (step S16). In other words, the channel state information measured by the channel estimator, the modulation parameters included in the control channel, the parameters such as the parameters, and the ability to output the traffic channel data correctly without canceling the control channel signal are determined, and the control channel is determined. Decide whether or not to cancel. If the channel quality is sufficiently high (step S 16; YES), the control channel re-encoding 'interleave. Modulation and control channel cancel processing is omitted and the traffic channel processing is performed (step S 19). In this case, the control channel canceller outputs the input from the memory as it is to the traffic channel processing unit. If the channel quality is not sufficiently high (step S16; NO), control channel re-encoding, interleaving, and modulation processing are performed (step S 17), and further control channel cancel processing is performed (step S 18). ), Traffic channel processing (step S19)
- control channel spreading code is not orthogonal to the code orthogonal to the traffic channel spreading code.
- Fig. 40 is a flowchart for extracting the traffic channel signal only when it is determined from the obtained control information that the traffic channel includes information addressed to the own station. is there.
- a signal is received (step S20), and the guard interval is also removed from the received signal power (step S21). Here, it is stored in the signal power memory from which the guard interval has been removed. Then, SZP conversion, FFT, and descrambling are performed, and frequency domain despreading is performed (step S23).
- the control channel spreading code is orthogonal to the traffic channel spreading code, it is a code output from the orthogonal code generator 1; otherwise, it is a code output from the orthogonal code generator 2. Perform despreading. After that, control channel demodulation, dinter leave, and decoding are performed (step S24).
- step S25 it is determined whether or not the traffic channel data addressed to itself is included in the received frame. If the traffic channel data is not included, the processing is terminated (step S25; NO). If traffic channel data is included! / (Step S25; YES), proceed to the next step, spreading code power of control channel signal Force that is orthogonal to traffic channel spreading code, or orthogonal It is determined whether the code has not been processed (step S26).
- step S26 If the code is orthogonal (step S26), if the orthogonal code is used (step S26; YES), it is determined whether the SNR is sufficiently high (step S27). That is, when an orthogonal code is used (step S26; YES), the channel condition information measured by the channel estimation unit, the modulation / coding parameters included in the control channel, etc. Determine whether data can be output correctly and determine whether to cancel the control channel. Specifically, it is determined whether or not the measured SNR value power orthogonal code is larger than the SNR threshold T that determines whether or not to cancel the control channel.
- step S27; YES If yes (step S27; YES), control channel re-encoding 'interleaved modulation, The control channel cancel process is omitted, and the traffic channel process is performed. In this case, the control channel canceller outputs the input from the memory as it is to the traffic channel processing unit. If not large (step S27; NO), control channel re-encoding, interleaving, and modulation processing are performed, and control channel cancellation processing is further performed to perform traffic channel processing.
- step S28 it is determined whether the SNR is sufficiently high when the non-orthogonal code is used.
- the traffic channel data can be obtained without canceling the power control channel signal such as the channel state information measured by the channel estimation unit and the modulation / code key parameters included in the control channel.
- control channel re-encoding 'interleave Modulation, control channel cancel processing is omitted, and traffic channel processing is performed.
- the control channel canceller outputs the input from the memory as it is to the traffic channel processing unit. If not large (step S28; NO), control channel re-encoding, interleaving, and modulation processing are performed, and control channel cancellation processing is further performed to perform traffic channel processing.
- control channel spreading code C and the traffic channel spreading code C are different.
- the first method is cell-specific control.
- As a second method there is a method using a scramble code for a control channel common to cells and a scramble code for a traffic channel specific to a cell. If a common scramble code for the control channel is used, the cell can be distinguished by the control channel spreading code.
- both the control channel signal and the traffic channel signal have been described using OFCDM using frequency domain spreading. It is obvious that the same effect can be obtained by using OFCDM that performs dimension spreading and OFC DM that performs spreading in the time domain, and is not limited to OFCDM that uses frequency domain spreading.
- the data communication system, the transmission device, and the reception device according to the present invention are useful for a radio communication system that transmits high-speed data communication and low-speed data or control data at the same time. And it has excellent flexibility in multiplexing.
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Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006531620A JPWO2006022136A1 (ja) | 2004-08-24 | 2005-08-08 | データ通信システム、受信装置及び送信装置 |
EP05768910A EP1793517A4 (en) | 2004-08-24 | 2005-08-08 | DATA COMMUNICATION SYSTEM, RECEIVER DEVICE AND TRANSMITTER |
US11/660,762 US20070263529A1 (en) | 2004-08-24 | 2005-08-08 | Receiver Apparatus and Transmitter Apparatus |
KR1020077006745A KR100875328B1 (ko) | 2004-08-24 | 2005-08-08 | 수신 장치 및 송신 장치 |
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PCT/JP2005/014506 WO2006022136A1 (ja) | 2004-08-24 | 2005-08-08 | データ通信システム、受信装置及び送信装置 |
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US (1) | US20070263529A1 (ja) |
EP (1) | EP1793517A4 (ja) |
JP (1) | JPWO2006022136A1 (ja) |
KR (1) | KR100875328B1 (ja) |
WO (1) | WO2006022136A1 (ja) |
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JP2010268040A (ja) * | 2009-05-12 | 2010-11-25 | Mitsubishi Electric Corp | 送信機、受信機および通信装置 |
JP2017532895A (ja) * | 2014-09-25 | 2017-11-02 | ゼットティーイー コーポレーションZte Corporation | マルチユーザー符号分割多元接続通信方法及び対応する送信機、受信機 |
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Also Published As
Publication number | Publication date |
---|---|
EP1793517A4 (en) | 2010-12-08 |
EP1793517A1 (en) | 2007-06-06 |
US20070263529A1 (en) | 2007-11-15 |
JPWO2006022136A1 (ja) | 2008-05-08 |
KR20070051346A (ko) | 2007-05-17 |
KR100875328B1 (ko) | 2008-12-22 |
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