JP2001268050A - Multi-carrier direct spread transmission/reception system, multi-carrier direct spread transmitter-receiver, multi-carrier direct spread transmitter and multi- carrier direct spread receiver, and multi-carrier transmission/reception system, multi-carrier transmitter- receiver, multi-carrier transmitter-receiver and multi- carrier receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-carrier direct spread transmission/reception system under frequency selective fading, which can transmit data with high quality at a high speed and decrease the difference between a peak transmission power and average transmission power so as to enhance the operating efficiency of an amplifier. SOLUTION: The mufti-carrier direct spread transmitter-receiver 90 of this invention is provided with a reception section 31a that receives m-sets of subcarriers, detects transmission data and extracts a pilot signal transmitted periodically, measurement sections 73a-73c that use the pilot signal to measure the quality of m-sets of the subcarriers and output the measurement result, a 2nd selection section 76 that selects n-sets of subcarriers used for data transmission among m-sets of the subcarriers on the basis of the received data and periodically transmits the measurement result to a transmitter side, an extract section 74 that extracts data dividely inserted to each of n-sets of the subcarriers, and a transmission section 31b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-carrier direct spread transceiver, a multi-carrier direct spread transceiver, a multi-carrier direct spread transmitter, a multi-carrier direct spread receiver, The present invention relates to a multicarrier transmission / reception system, a multicarrier transceiver, a multicarrier transmitter, and a multicarrier receiver.

[0002]

2. Description of the Related Art With the recent increase in demand for multimedia services, high-speed data communication using radio is required. In mobile radio communication, multipath propagation paths are generated due to reflection, diffraction, and scattering of radio waves. It is formed. Under this environment, the data to be transmitted is 2 Mbps
When the transmission rate is as high as ２０20 Mbps, the influence of frequency selective fading becomes significant. This frequency-selective fading causes intersymbol interference, and causes significant deterioration in communication quality. For this reason, a multi-carrier scheme is used as one of the measures against frequency selective fading.

The multi-carrier system is a system in which data to be transmitted is divided into a plurality of data having a low bit rate, and the divided data is transmitted using a plurality of subcarriers. It is. FIG.
(A) is a schematic diagram of a spectrum arrangement using a single carrier. Since a single carrier is used to transmit data having a speed of 100 Mbps, intersymbol interference occurs. On the other hand, FIG. 41B is a schematic diagram of a spectrum arrangement using multicarriers. Data having a speed of 100 Mbps is divided into, for example, four 25 Mbps data and transmitted using a plurality of subcarriers. You. Therefore, the band affected by the frequency selective fading becomes equivalent to the flat fading, and the other bands are not affected by the fading, so that the transmission quality is improved. In addition, data of 7 Mbps may be transmitted on three subcarriers.

On the other hand, as a standard for a next-generation mobile communication system, a code division multiple access (hereinafter, referred to as CDMA) system is used. This CDMA system has the characteristics of accommodating a large number of subscribers, being excellent in fading resistance and interference resistance, and having high frequency efficiency. For this reason, a multicarrier direct spread CDMA transmission scheme in which the multicarrier scheme and the CDMA scheme are combined has been proposed (for example, "Broadband OFDM / DS-CDMA Packet Transmission").
in Frequency Selective Fading Channel, "Y.Hanada,
S.Abeta, M.Sawahashi, and F.Adachi, PIMRC'99, pp.9
11-915, Osaka, September, 1999).

The advantages of the multi-carrier direct spread CDMA transmission system are as follows. That is, by increasing the number of subcarriers, the symbol length per one subcarrier (the duration of one symbol) becomes longer and the occupied bandwidth becomes narrower, so that the frequency efficiency is improved. Transmission efficiency is improved because data can be allocated freely, and further, by changing the modulation method of each subcarrier, data can be hierarchized, and each subcarrier is densely arranged on the frequency axis. The frequency efficiency is improved.

On the other hand, according to the multicarrier direct spread CDMA transmission system, it is necessary for both the transmitting side and the receiving side to provide a root roll-off filter having the same pass characteristic for each subcarrier. Since the size of this filter circuit is large, it is difficult to reduce the size of the device, and
It becomes difficult to reduce power consumption. For this reason, the OFDM method (Orthogonal Frequencies) is used as one of the multicarrier methods.
quency Division Multiplexing method). This OFDM system is a type of multi-carrier system in which subcarriers orthogonal to each other are arranged so that a large number of modulated waves overlap with each other on frequency, and data to be transmitted is arranged on each of the arranged subcarriers. It is a method of dividing and transporting.

The advantages of this OFDM system are that it is resistant to frequency-selective fading, and that the subcarriers are orthogonal to each other, so that the frequency utilization efficiency can be theoretically maximized. That is, when compared with the single carrier system under the condition that the transmission bandwidth and the bit rate are constant, the data to be transmitted is divided into a number of subcarriers and transmitted. The length is longer than that, and intersymbol interference can be avoided. In addition, since each subcarrier is orthogonal to each other, it is possible to freely change the transmission power or modulation scheme for each subcarrier,
Information can be easily hierarchized.

Further, in this OFDM system, components necessary for making subcarriers orthogonal to each other accurately are developed, and an LSI for digital signal processing using FFT (Fast Fourier Transform), a high-speed analog-to-digital conversion, Vessels have been developed. As a result, in practice, the transmitter can accurately generate a large number of subcarrier frequencies, and the receiver can also accurately demodulate the subcarrier with respect to fluctuations in transmission path characteristics. .

Japanese Patent Laid-Open Publication No. Hei 10-190520 (hereinafter referred to as Publication 1) describes a spread spectrum communication system in which information of different symbol rates is code division multiplexed and connected by direct sequence spread spectrum. . Specifically, the technique described in this publication 1 proposes a code configuration method that combines codes having a long period with excellent autocorrelation characteristics, and transmits information of different transmission rates to the same frequency band with different spreading factors. This is a technique related to a spread spectrum communication system that does not interfere with each other even when multiplexed at the same time.

[0010]

However, in the multi-carrier system, a modulated signal of each sub-carrier is synthesized and a radio signal is transmitted. Therefore, if the phases of the modulated signals are the same, the transmission is performed. The modulated signal has a very large peak power. Therefore, in the FDMA system, the difference between the peak transmission power and the average transmission power becomes large, and this difference deteriorates the use efficiency of each of the transmission amplifier and the reception amplifier. That is, in the amplification characteristics of an amplifier having a linear region and a non-linear region, there is a problem that a wide linear region cannot be secured and it is difficult to reduce transmission power.

When a normal amplifier is used, intermodulation distortion occurs due to the non-linearity of the power amplifier and the transmission path, so that there is a problem that transmission characteristics are greatly deteriorated. Furthermore, the above publication 1 does not describe any technique relating to transmission power. The present invention has been devised in view of such a problem, and in a multicarrier direct spreading transmission / reception system under frequency selective fading, data transmission is performed using a subcarrier band having high transmission quality,
High-quality and high-speed data transmission is enabled by not performing data transmission using a subcarrier band with low transmission quality, and the difference between the peak transmission power and the average transmission power is reduced, and the amplifier usage efficiency is reduced. Like to improve,
Provided are a multi-carrier direct spreading transmission / reception system, a multi-carrier direct spreading transceiver, a multi-carrier direct spreading transmitter and a multi-carrier direct spreading receiver, and a multi-carrier transmission / reception system, a multi-carrier transmission / reception, a multi-carrier transmitter and a multi-carrier receiver. The purpose is to.

[0012]

SUMMARY OF THE INVENTION Therefore, a multi-carrier direct spread transmission / reception system of the present invention is a multi-carrier direct spread transmitter for code-multiplexing data to be transmitted and transmitting a radio signal using a plurality of subcarriers. And a multi-carrier direct-spread receiver that is arranged opposite to the multi-carrier direct-spread transmitter and receives a code-multiplexed radio signal transmitted using a plurality of subcarriers. A first selection unit configured to select n (n represents a natural number less than m) subcarriers having a good quality measurement result from m (m represents a natural number of 2 or more) subcarriers; , Connected to the first selection unit, inserts a pilot signal into data to be transmitted, code-multiplexes it, and transmits a radio signal using each of the selected n subcarriers. And a transmitter for transmitting a pilot signal on (mn) non-selected subcarriers, wherein the multicarrier direct-sequence receiver receives the m subcarriers transmitted by the multicarrier direct-sequence transmitter. And a receiver for detecting transmission data and extracting a periodically transmitted pilot signal, and an extractor connected to the receiver for extracting data divided and inserted into each of n subcarriers. Unit and the receiving unit,
A measurement unit that performs quality measurement on each of the m subcarriers using the pilot signal and outputs a measurement result, and is connected to the measurement unit, and among the m subcarriers,
It is characterized by comprising a second selection unit that selects n subcarriers on which data is transmitted based on received data and periodically transmits a measurement result to a transmission side. Item 1).

The transmitting section of the multi-carrier direct spreading transmitter is configured to insert selection information relating to a subcarrier number on which transmission data is superimposed into an area of control information relating to a transmission rate in the transmission data. The extractor of the multi-carrier direct spread receiver may be configured to select n sub-carriers based on the control information (claim 2), and select information on a sub-carrier number on which transmission data is superimposed, In addition to being configured to be inserted into the area of the transmission data, the extraction unit of the multi-carrier direct spread receiver may be configured to select n subcarriers based on the transmission data.

Further, the measuring section in the multi-carrier direct spread receiver can be configured to measure the quality based on the total value of the deviation of the received pilot signal from the symbol point, and the received signal strength representing the electric field strength can be measured. The display can also be configured to measure quality. The multi-carrier direct-sequence transceiver according to the present invention includes a multi-carrier direct-sequence transmission unit that code-multiplexes data to be transmitted and transmits a radio signal using a plurality of subcarriers. And a multi-carrier direct-spreading receiver for receiving a radio signal transmitted by using a plurality of subcarriers after code multiplexing by the carrier direct-spreading transmitter.
A first selector for selecting n (n represents a natural number of m or less) subcarriers having good quality measurement results from among subcarriers of 2 or more natural numbers) and connected to the first selector. , A pilot signal is inserted into data to be transmitted, code-multiplexed, a radio signal is transmitted using each of the n selected subcarriers, and (mn) unselected subcarriers are transmitted. A multi-carrier direct-spread receiver, which includes a transmitter for transmitting a pilot signal, receives a radio signal transmitted by using the m sub-carriers after code multiplexing by the opposed multi-carrier direct-spread transmitter and detects transmission data. And a receiving unit that extracts a pilot signal that is periodically transmitted, and extracts data that is connected to the receiving unit and divided and inserted into each of n subcarriers. An extraction unit, connected to the receiving unit, a measurement unit for outputting a measurement result by measuring the quality of each of the m subcarriers using the pilot signal,
A second selection unit that is connected to the measurement unit and selects n subcarriers on which data is transmitted from the m subcarriers based on the received data, and periodically transmits the measurement result to the transmission side. (Claim 4).

Further, the multi-carrier direct spreading transmitter of the present invention provides n (where n is equal to or less than m) subcarriers from among m (m is a natural number of 2 or more) subcarriers based on the quality measurement result on the receiving side. A first selection unit for selecting a subcarrier (representing a natural number), and a pilot signal that is connected to the first selection unit, is inserted into the data to be transmitted, code-multiplexed, and uses each of the selected n subcarriers. And a transmitting unit for transmitting a pilot signal using (mn) non-selected subcarriers.

In addition, the multicarrier direct spreading receiver of the present invention receives a radio signal that is code-multiplexed and transmitted using m (m is a natural number of 2 or more) subcarriers and transmits the transmission data. And a receiving unit for extracting a pilot signal transmitted periodically and a receiving unit connected to the receiving unit and divided into n (n is a natural number equal to or less than m) subcarriers to be inserted. An extraction unit for extracting data, a measurement unit connected to the reception unit, which measures the quality of each of the m subcarriers using the pilot signal and outputs a measurement result; and
N of the subcarriers for which data is being transmitted
The present invention is characterized in that the sub-carrier is selected based on the received data and a second selecting unit is configured to periodically transmit the measurement result to the transmitting side (claim 6).

Further, the multicarrier direct spread transmission / reception system of the present invention includes a multicarrier direct spread transmitter for code-multiplexing data to be transmitted and transmitting a radio signal using a plurality of subcarriers. And a multi-carrier direct-spread receiver that receives a radio signal transmitted by using a plurality of subcarriers that is code-multiplexed and is multiplexed. A pilot signal is inserted into data and code-multiplexed, and n (n represents a natural number of 2 or more)
K sub-carriers (k is n
A transmission unit that inserts the same data into each of the following sub-carriers and transmits the same data; a control unit connected to the transmission unit and capable of controlling the increase or decrease of the transmission power according to the transmission power command; The multicarrier direct-sequence receiver includes an adding unit for adding a pilot signal composed of a known signal to transmission data in a carrier, and the radio transmitted by using the k subcarriers transmitted by the multicarrier direct-sequence transmitter. A receiving unit that receives a signal and outputs a signal resulting from a radio signal, and is connected to the receiving unit, measures quality of each of the k subcarriers, outputs an individual measurement result, and outputs the k subcarriers. A measuring unit that measures the quality of the combined carrier obtained by combining the carriers and outputs a combined measurement result; A control command generator for outputting a control command indicating increase, decrease or maintenance for each transmission power level of the carrier, and a control for increasing, decreasing or maintaining the combined carrier based on the combined measurement result, connected to the measurement unit A combined command generator that outputs the command as a combined command, and is connected to the control command generator and the combined command generator, and compares the number of matches between the control command and the combined command with a predetermined threshold value, A transmission power control unit that determines whether to increase, decrease, or maintain the transmission power for each of the k subcarriers and outputs the determination as a transmission power control command. 7).

[0018] The transmitting unit may be configured to encode the data to be transmitted by using a combined orthogonal code that is mutually orthogonal between users. Further, if the number of matches exceeds the threshold, the transmission power control
Outputs a transmission power control command that matches all transmission powers of this subcarrier with the combined command. If the number of matches does not exceed the threshold, there is no increase or decrease for subcarriers that have transmission power that matches the combined command. May be configured to output a transmission power control command for causing a subcarrier having transmission power not matching the combined command to have a transmission power matching the combined command. 8) The determination of the increase / decrease regarding the number of control commands and the number of combined commands is made in accordance with the number i (i represents a natural number of 2 or more) of successive runs of increase or decrease, and an upper limit value of the increase / decrease number And may be configured to increase or decrease by the power of 2 (i-1) (claim 9).

In addition, the control unit of the multi-carrier direct spreading transmitter transfers a sub-carrier for data transmission to a different sub-carrier and transmits a different spread to the sub-carrier based on a sub-carrier frequency change command transmitted by the receiving side. The multi-carrier direct-sequence receiver may be configured to assign a code, wherein the multi-carrier direct-spread receiver is connected to the measuring unit, compares the measurement result with a predetermined quality reference value, and transmits the same data. For the sub-carriers that do not satisfy the predetermined quality reference value among the sub-carriers, the multi-carrier direct-sequence transmitter may be provided with a threshold value comparison / frequency change command generation unit for requesting a frequency change. (Claim 11).

The multi-carrier direct-sequence transceiver according to the present invention is arranged to face a multi-carrier direct-sequence transmitter for code-multiplexing data to be transmitted and transmitting a radio signal using a plurality of subcarriers. A multi-carrier direct-sequence transmitter for receiving a radio signal transmitted by using a plurality of sub-carriers after code-multiplexing by the opposed multi-carrier direct-sequence transmitter, wherein the multi-carrier direct-sequence transmitter has data to be transmitted. And a pilot signal is inserted into the subcarriers and code-multiplexed, and each of k subcarriers (k represents a natural number less than n) separated by a predetermined frequency from n (n represents a natural number of 2 or more) subcarriers A transmitting unit that inserts and transmits the same data, a control unit that is connected to the transmitting unit, and that can control increase and decrease of transmission power according to a transmission power command, and k sub-units. The multicarrier direct-spreading receiver has an additional unit that adds a pilot signal consisting of a known signal to the transmission data in the carrier, and the opposing multicarrier direct-spreading transmitter code-multiplexes and transmits using k subcarriers. A receiving unit that receives the received wireless signal and outputs a signal resulting from the wireless signal, and is connected to the receiving unit, measures the quality of each of the k subcarriers, outputs an individual measurement result, and outputs the k A measuring unit that measures the quality of the combined carrier obtained by combining the subcarriers and outputs a combined measurement result; and a transmission unit that is connected to the measurement unit and increases or decreases the transmission power level of each of the k subcarriers based on the individual measurement result. A control command generator for outputting a control command indicating a decrease or a maintenance; A combination command generation unit for outputting a control command representing increase, decrease or maintenance as a combination command, and a control command generation unit and a combination command generation unit connected to the control command generation unit. If the number of subcarriers exceeds the number of subcarriers, all of the k subcarriers are made to match the combined command. A transmission power control command unit for making the carrier coincide with the combined command, thereby increasing / decreasing operation by inverting the determination on the k subcarriers and transmitting a control command to the multicarrier direct spread transmitter. (Chart 12).

Further, the multi-carrier direct spreading transmitter of the present invention inserts a pilot signal into data to be transmitted, code-multiplexes the same, and selects a predetermined frequency from n (n is a natural number of 2 or more) subcarriers. A transmitting unit that inserts and transmits the same data to each of the k subcarriers (k is a natural number equal to or less than n), and a transmitting unit that is connected to the transmitting unit and controls increase and decrease of transmission power according to a transmission power command It is characterized by comprising a control unit and an adding unit for adding a pilot signal composed of a known signal to transmission data with k subcarriers (claim 13).

Further, the multicarrier direct spread receiver of the present invention receives a radio signal which is code-multiplexed and transmitted using k (k is a natural number of 2 or more) subcarriers, and converts the radio signal into a radio signal. A receiver for outputting a signal resulting from the measurement, and connected to the receiver for measuring the quality of each of the k subcarriers and outputting an individual measurement result;
A measuring unit that measures the quality of the combined carrier obtained by combining the number of subcarriers and outputs a combined measurement result; and a transmission power level connected to the measuring unit and based on the individual measurement result, for each of the k subcarriers, A control command generator for outputting a control command indicating increase, decrease or maintenance, and a combining command connected to the measuring unit for outputting a control command indicating increase, decrease or maintenance for the combining carrier based on the combined measurement result as a combining command Generating part,
A quality measurement result and a quality after combination, which are connected to the control command generation unit and the combination command generation unit and are performed on each of k subcarriers using a monitor signal so as to transmit transmission power control regarding transmission data to the transmission side. A transmission power control command section for performing independent power control for each subcarrier using the measurement result and transmitting a control command to a transmission side is provided (claim 14).

The multicarrier direct spread transmission / reception system of the present invention includes a multicarrier transmitter for transmitting a radio signal using m (m is a natural number of 2 or more) subcarriers for data to be transmitted. , A multi-carrier receiver that is arranged to face the multi-carrier transmitter and receives a radio signal transmitted using m sub-carriers, wherein the multi-carrier transmitter has n (n is equal to or less than m) (Representing a natural number of the subcarriers) to suppress the peak power of the m subcarriers based on the quality information on the subcarriers.
-N) a suppression bit insertion unit for inserting dummy bits into the subcarriers, and a wireless signal connected to the suppression bit insertion unit for transmitting data to be transmitted using each of the selected n subcarriers A multi-carrier receiver that receives a radio signal transmitted using m subcarriers, detects transmission data, and extracts a pilot signal, and is connected to the reception unit. A measurement unit that measures the quality of m subcarriers using a pilot signal and outputs a measurement result, and is connected to the measurement unit, and outputs n measurement signals from the m subcarriers based on the measurement result.
An extractor that selects the number of subcarriers, deletes dummy bits and outputs the selected subcarriers, and is connected to the measurement unit, and transmits quality information on the selected n subcarriers to the transmitting side using the n subcarriers. It is characterized by comprising a second selection unit.

The duplex method may be a time division duplex or a frequency division duplex. Further, the measurement unit in the multicarrier receiver is configured to measure the quality of the subcarrier by the received signal strength indication indicating the electric field strength, or the measurement unit in the multicarrier receiver determines the quality of the symbol of the received pilot signal. It may be configured to measure based on the total value of deviation from the point.

The multicarrier transmitter / receiver according to the present invention is a multicarrier transmitter for code-multiplexing data to be transmitted and transmitting a radio signal using m (m is a natural number of 2 or more) subcarriers. And a multi-carrier receiving unit that receives a radio signal transmitted by an opposing multi-carrier transmitter using m sub-carriers, and the multi-carrier transmitting unit has n (n is m In order to suppress the peak power of m subcarriers based on the quality information on the subcarriers of the following
-N) a suppression bit insertion unit for inserting dummy bits into the number of subcarriers, and a wireless signal connected to the suppression bit insertion unit for transmitting data to be transmitted using each of the selected n number of subcarriers A multi-carrier receiving unit that receives a radio signal transmitted using m subcarriers, detects transmission data, and extracts a pilot signal, and is connected to the receiving unit. A measurement unit that measures the quality of the m subcarriers and outputs a measurement result using a pilot signal included in the m subcarriers transmitted by the opposed multicarrier transmitter, Based on the result, n sub-carriers are selected from m sub-carriers, and an extraction unit for removing and outputting dummy bits and a measurement unit are connected to the selected n sub-carriers. Is characterized by a quality information is configured to include a second selection unit that transmits to the transmission side by the n subcarriers relating subcarriers (claim 16).

Further, the multi-carrier transmitter of the present invention
In order to transmit data to be transmitted using m (m is a natural number of 2 or more) subcarriers, m (n is a natural number of m or less) subcarriers are used to transmit data to be transmitted. In order to suppress the peak power of the subcarrier,
A suppression bit insertion unit that inserts a dummy bit into (mn) subcarriers, and a radio signal connected to the suppression bit insertion unit to transmit data by using each of the selected n subcarriers And a transmission unit for transmitting the data.

[0027] The transmitting section may be configured to insert a pilot signal temporally multiplexed into the data to be transmitted and code-multiplex it. Further, the multicarrier receiver of the present invention receives a radio signal transmitted using m (m is a natural number of 2 or more) subcarriers, detects transmission data, and extracts a pilot signal. A measuring unit connected to the receiving unit and measuring the quality of the m subcarriers using the pilot signal and outputting the measurement result; and the m subcarriers connected to the measuring unit and based on the measurement result. (N is a natural number less than or equal to m) from the sub-carriers, the extracting unit that removes and outputs the dummy bits inserted by the transmitting side, and the n sub-carriers that are connected to the measuring unit and selected. It is characterized by comprising a second selecting unit for transmitting quality information on a carrier to a transmitting side by using n subcarriers (claim 19).

Further, the multicarrier direct spread transmission / reception system of the present invention performs code multiplexing on data to be transmitted, and
A multi-carrier direct-spreading transmitter for transmitting a radio signal using sub-carriers (m is a natural number of 2 or more); And a multi-carrier direct-sequence receiver that receives a radio signal transmitted using the sub-carriers of the multi-carrier direct-sequence receiver. A control unit that can set a low spreading factor for subcarriers with good measurement results and a high spreading factor for subcarriers with poor measurement results while maintaining the total transmission rate by changing the spreading factor for each subcarrier based on: Unit, a pilot signal is inserted into data to be transmitted, code-multiplexed at a spreading factor set by the hierarchical orthogonal code, and a radio signal is transmitted. A multi-carrier direct-spread receiver receives a radio signal transmitted using m sub-carriers by code multiplexing of the multi-carrier direct-spread transmitter, detects transmission data, and detects a pilot signal. A receiving unit to be extracted; a measuring unit connected to the receiving unit for measuring the quality of each subcarrier using a pilot signal and outputting a measurement result; To send to the machine
The present invention is characterized by comprising a spreading factor determining unit for determining a spreading factor of each subcarrier based on the measurement result (claim 20).

In addition, in the above-described multi-carrier direct spread transmission / reception system, the duplex system may be a time division duplex or a frequency division duplex. The multi-carrier direct-sequence transceiver according to the present invention performs multi-carrier direct-sequence transmission by code-multiplexing data to be transmitted and transmitting a radio signal using m (m is a natural number of 2 or more) subcarriers. And a multi-carrier direct-spread receiver that receives a radio signal that is code-multiplexed by an opposing multi-carrier direct-spread transmitter and that is transmitted using m subcarriers. The spreading transmitter changes the spreading factor for each subcarrier based on the quality measurement result of the m subcarriers in the multicarrier direct spreading receiver, and maintains the total transmission speed while maintaining low total spreading speed. A control unit that can set a high spreading factor for subcarriers with poor measurement results, and a pilot signal Insertion, code multiplexing at the spreading factor set by the layered orthogonal code, and a transmission unit for transmitting a radio signal. The receiver receives radio signals transmitted using m subcarriers, detects transmission data, extracts pilot signals, and is connected to the receiver, and measures the quality of each subcarrier using pilot signals. A measuring unit that outputs a measurement result and a spreading factor determining unit that is connected to the measuring unit and determines a spreading factor of each subcarrier based on the measurement result so as to transmit the spreading factor information to the multicarrier direct spreading transmitter. (Claim 21).

In addition, the multi-carrier direct spreading transmitter of the present invention uses m (m is 2) based on the quality measurement result on the receiving side.
While the total transmission rate is maintained by changing the spreading factor for each of the above sub-carriers), a low spreading factor is used for subcarriers having good measurement results, and a high spreading factor is used for subcarriers having poor measurement results. A control unit that can be set, a pilot signal is inserted into data to be transmitted, code-multiplexed by a hierarchical orthogonal code, and a spreading factor of m subcarriers is determined based on a quality measurement result for each of the m subcarriers. With a transmission unit that transmits a radio signal using a low spreading factor for subcarriers with good measurement results and a high spreading factor for subcarriers with poor measurement results while maintaining the total transmission rate. It is characterized by comprising (claim 22).

Further, the multicarrier direct spread receiver of the present invention receives a radio signal that has been code-multiplexed and transmitted using m (m is a natural number of 2 or more) subcarriers and transmits transmission data. A receiving unit that detects and extracts a pilot signal, is connected to the receiving unit, measures a quality of each subcarrier using the pilot signal, and outputs a measurement result. In order to transmit the information to the multi-carrier direct spreading transmitter, a spreading factor determining unit for determining a spreading factor of each subcarrier based on the measurement result is provided.
3).

In addition, in the above-described multi-carrier direct spread transmission / reception system, radio transmission / reception may be performed under frequency selective fading, and in the above-described multi-carrier transmission / reception system, radio transmission / reception may be performed under frequency selective fading. Good.

[0033]

Embodiments of the present invention will be described below with reference to the drawings. (A) Description of First Embodiment of the Present Invention FIG. 1 is a configuration diagram of a multicarrier direct spread transmission / reception system according to a first embodiment of the present invention. The multicarrier direct spreading transmission / reception system 40 shown in FIG.
This is a mobile radio communication system using the system, and includes a multi-carrier direct spread transceiver 50 and a multi-carrier direct spread transceiver 90. Further, in the multi-carrier direct spread transmission / reception system 40, radio transmission / reception is performed under frequency selective fading.

The multi-carrier direct-sequence transceiver 50 shown in FIG. 1 code-multiplexes data to be transmitted and transmits a radio signal using a plurality of subcarriers.
It comprises a serial / parallel converter (S / P) 10, a first selection unit 11, a transmission unit 30a, a control signal output unit 16, a reception unit 30b, and antennas 19c and 19d.

Here, the multi-carrier direct spread transceiver 50 is a base station, and the multi-carrier direct spread transceiver 90 is a mobile station. Also, in the description of other embodiments and other modifications described below, unless otherwise specified.
The configuration of the multi-carrier direct spreading transmission / reception system 40 similar to FIG. 1 is employed. Further, in the multi-carrier direct spreading transmission / reception system 40, the duplex method is a frequency division duplex (FDD: Frequency).
Division Duplex) is used. In the following description, the opposing multi-carrier direct spreading transceivers 50 and 90 may be simply referred to as a receiving side and a transmitting side.

First, the serial / parallel converter 10
The first selector 11 converts the input serial data into n parallel data and outputs the data. The first selector 11 converts the n subcarriers from the m subcarriers based on the quality measurement result on the receiving side. To choose. Here, m represents a natural number of 2 or more, and n represents a natural number of m or less.

The transmitting section 30a is connected to the first selecting section 11, inserts a pilot signal into data to be transmitted, code-multiplexes it, and converts a radio signal using each of the n selected subcarriers. In addition to transmitting, a pilot signal is transmitted on (mn) non-selected subcarriers. The antenna 19c transmits a radio signal, and the antenna 19d receives a radio signal. Things. Further, the receiving unit 30b receives the radio signal output from the antenna 19d and detects and outputs the radio signal.

The control signal output section 16 inputs the control signal transmitted by the multi-carrier direct spread transceiver 90 to the first selection section 11. The control signal is a subcarrier selection signal generated by the multicarrier direct spreading transceiver 90 based on the quality of the subcarrier received by the multicarrier direct spreading transceiver 90, which will be described later.

Thus, the serial data to be transmitted is converted into parallel data by the serial / parallel converter 10, and the first selector 11 selects the quality measurement result on the receiving side from the m subcarriers. , N subcarriers are selected. And this selected n
Using these subcarriers, transmitting section 30a inserts a pilot signal into data to be transmitted, code-multiplexes and outputs a radio signal, and this radio signal is transmitted from antenna 19c to multicarrier direct spread transceiver 90. It is sent.

On the other hand, the multi-carrier direct spread transceiver 9
Numeral 0 is a radio signal that is arranged opposite to the multi-carrier direct spread transceiver 50 and receives a radio signal that is code-multiplexed and transmitted using a plurality of subcarriers, and includes antennas 19c and 19d and a receiving unit. 31a and m measuring units 7
3a to 73c, a second selector 76, an extractor 74, a parallel / serial converter (P / Sn: 1) 75, and a transmitter 31b.

Here, the receiving unit 31a receives a radio signal that has been code-multiplexed and transmitted using m subcarriers, detects transmission data, and extracts a pilot signal that is transmitted periodically. Things. Further, the measuring units 73a to 73c are each connected to the receiving unit 31a, measure the quality of each of the m subcarriers using the pilot signal, and output the measurement results. Specifically, these measuring units 73a to 73c
Are the received signal strength indicators (RS
SI: Received Signal Strength Indicator)
It measures quality. Note that another method for this measurement method will be described in a first modification of the first embodiment described later.

In addition, the second selecting section 76 includes a measuring section 73a
To 73c, and selects n subcarriers on which data is transmitted from m subcarriers based on the received data, and periodically transmits the measurement result to the transmission side. . Further, the extracting unit 74 includes the receiving unit 31a
, And extracts n parallel data divided and inserted into each of the n subcarriers. The parallel-serial converter 75 outputs the n parallel data output from the extraction unit 74. Is converted into serial data and output. In addition, the transmission unit 31b
Data to be transmitted and m output from the second selector 76
It converts data relating to the quality measurement result of the book subcarrier into a radio signal and transmits it.

As a result, the radio signal that has been code-multiplexed and transmitted using m subcarriers is transmitted to antenna 19
d, the transmission data is detected by the reception unit 31a, the pilot signal transmitted periodically is extracted, and the pilot signal transmitted periodically is extracted. The parallel / serial converter 75 converts the parallel data into serial data. Output. Further, in each of the measuring units 73a to 73c, m
The quality is measured for each of the sub-carriers, the measurement result is output, and the extracting unit 74 determines, from the m sub-carriers, the n sub-carriers for which data is being transmitted are the received data. Is selected based on the content included in the data and transmitted by the transmitting unit 31b.
The data relating to the quality measurement result for the m subcarriers output from the second selection unit 76 is converted into a radio signal and transmitted.

That is, the second selector 7 shown in FIG.
6, transmitting section 31b, antennas 19c and 19d, receiving section 3
0b, the control signal output unit 16 cooperates to form a feedback loop 100. Further, as shown in FIG. 1, the multi-carrier direct spreading transceiver 50 also functions as a multi-carrier direct spreading transmitter, and the multi-carrier direct spreading transceiver 90 also functions as a multi-carrier direct spreading receiver. I have. That is, the multi-carrier direct-sequence transmitter (multi-carrier direct-sequence transceiver 5
0) is the first for selecting n subcarriers from the m subcarriers based on the quality measurement result on the receiving side.
A selection unit 11 connected to the first selection unit 11 for inserting and pilot-multiplexing a pilot signal into data to be transmitted and transmitting a radio signal using each of the selected n subcarriers; Transmitter 3 that transmits a pilot signal on (mn) subcarriers that have not been transmitted
0a.

Similarly, a multi-carrier direct-sequence receiver (multi-carrier direct-sequence transceiver 90) receives a radio signal that is code-multiplexed and transmitted using m subcarriers, detects transmission data, and detects transmission data. , A receiving unit 31a that extracts a pilot signal transmitted periodically, and an extracting unit 7 that is connected to the receiving unit 31a and extracts data that is divided and inserted into each of n subcarriers.
4, measuring units 73a to 73c that are connected to the receiving unit 31a, measure the quality of each of the m subcarriers using the pilot signal, and output the measurement results, and are connected to these measuring units 73a to 73c. , A second selection unit 76 that selects n subcarriers on which data is transmitted from the m subcarriers based on the received data, and periodically transmits the measurement result to the transmission side. That is, it was constituted.

Next, the multi-carrier direct spread transceiver 5
Details of the transmission unit 30a included in 0 will be described with reference to FIG. FIG. 2 is a block diagram of the multi-carrier direct spread transceiver 50 according to the first embodiment of the present invention. The transmitting section 30a shown in FIG. 2 includes modulators 12a to 12c, pilot signal inserting sections (adding sections) 13a to 13c, a plurality of multipliers 14a, 14b, 14c, and a plurality of adders 1
5, 19a, filters 17a to 17c, and an amplifier 19
b.

Here, each of the modulators 12a to 12c converts the data output from the first selector 11 into, for example, a QP
SK modulation is performed, and a pilot signal insertion unit 13a
To 13c insert a pilot signal into the data output from the modulators 12a to 12c, respectively.
The plurality of multipliers 14a output signals obtained by multiplying the signals output from the pilot signal insertion units 13a to 13c by the orthogonal codes, respectively. It outputs a signal obtained by adding the output signal and another user signal,
Each of the plurality of multipliers 14b outputs a signal obtained by multiplying a signal output from each of the adders 15 by a long code. Further, the filters 17a-1
7c limits the band of the signal output from the plurality of multipliers 14b.
Output a signal obtained by multiplying a signal output from each of the filters 17a to 17c by a subcarrier output from an oscillator (not shown).

Specifically, the multiplier 14a includes the filter 1
7a and the frequency f₁With the subcarrier having
The multiplier 14b calculates the output of the filter 17b and the frequency
Number f _TwoMultiplied by a subcarrier having
The arithmetic unit 14c outputs the output of the filter 17c and the frequency f_mTo
Multiplied by the subcarriers
So that multiple subcarriers with wave values are output
Has become.

The adder 19a adds the signals output from each of the plurality of multipliers 14c and outputs the added signal. The amplifier 19b amplifies the signal from the adder 19a. Output. In FIG. 2, those having the same reference numerals as those described above have the same or similar functions, and further description will be omitted.

FIG. 3 is an arrangement diagram of the transmission spectrum according to the first embodiment of the present invention, and shows the subcarrier frequencies f ₁ to f ₁ .
f _m is displayed. The user data indicated by oblique lines is divided into these subcarriers and transmitted. Next, details of the receiving unit 31a included in the multi-carrier direct spread transceiver 90 will be described with reference to FIG.
This will be described with reference to FIG. FIG. 4 is a block diagram of the multicarrier direct spread transceiver 90 according to the first embodiment of the present invention. The receiving unit 31a shown in FIG. 4 includes a multiplier 14c,
Filters 67a to 67c and correlation detectors 68a and 68
b, 68c, 69a, 69b, 69c, 70a, 70
b, and 70c, and is configured to include a plurality of Rake combining portion 72 a to 72 c, a radio signal received is adapted to be detected for each subcarrier frequency f ₁ ~f _m.

Here, the filters 67a to 67c limit the bands of the signals output from the plurality of multipliers 14c. Further, the correlation detectors 68a, 68b,
68c, respectively, for the sub-carrier frequency f ₁ output from the filter 67a, be those of the respective delay wave arriving from a plurality of directions despreading process to extract a pilot signal and outputs a detection signal, Multipliers 14b and 14a, pilot signal extraction unit 20,
It comprises a synchronous detection unit 21.

The reason why three correlation detectors 68a, 68b and 68c are provided for one subcarrier is to separate delayed waves (fingers) arriving from three directions by a multipath propagation path. This is for detecting. This number is merely an example, and may be three or more. Further, the multiplier 14b includes a filter 67a
Is multiplied by the long code to the signal output from the multiplier 14a, and the multiplier 14a multiplies the signal output from the multiplier 14b by the orthogonal code and outputs the result.

The synchronous detection section 21 detects the signal output from the multiplier 14a, and is, for example, a QPS.
The pilot signal extraction unit 20 extracts a pilot signal from the signal output from the multiplier 14a, and performs a synchronous detection unit 21 and a measurement unit 73a to 73d.
73c. Also, the Rake combining unit 7
2a is for synthesizing each of the detection signals output from each of the correlation detectors 68a, 68b, 68c. The Rake combining means that a signal having a large power is obtained by, for example, synchronizing a signal for each path obtained by separating a received signal from three directions by despreading processing, aligning time and phase, and weighting and combining the signals according to an SN ratio for each path. Output. Note that this Rake combination is also referred to as a maximum ratio combination and is a known technique, and thus detailed description will be omitted. In FIG. 4, those having the same reference numerals as those described above have the same or similar functions, and further description will be omitted.

Thus, the signal flow for subcarrier f ₁ is as follows. That is, the filter 6
The signal from 7a is output from correlation detectors 68a, 68b, 68c.
, And multiplied by the long code and the orthogonal code in the multipliers 14b and 14a, detected by the synchronous detection unit 21, and the detected signals are respectively detected by the correlation detection units 68a, 68b, 68c,
Rake combining is performed in the Rake combining unit 72a, and the result is input to the extraction unit 74 at the next stage (displayed as selection of n waves out of m waves). Further, the signal output from pilot signal extraction section 20 is input to measurement section 73a, and the reception quality is measured.

Next, it is processed in a similar manner subcarrier frequency f _2. That is, the correlation detectors 69a, 69
Each of b and 69c despreads the received signal output from the filter 67b, outputs a detection signal, and outputs a pilot signal. Also, each of the correlation detection units 70a, 70b, 70c
For subcarrier frequency f _m which is outputted from 7c,
It performs the same processing as the correlation detectors 68a, 68b, 68c. Each of the rake combiners 72b and 72c is the same as the rake combiner 72a.

[0056] As a result, the sub-carrier frequency f _1, the sub-carrier frequency f _2, ..., of the sub-carrier frequency f _{m m}
For each of the subcarriers, Rake combining sections 72a to 72c perform Rake combining, and their outputs are input to extraction section 74, where the transmission data divided by the transmitting side is inserted. Is extracted,
The parallel / serial converter 75 converts the parallel data into serial data and outputs the serial data.

Further, based on the quality of the subcarrier measured by each of the measuring units 73a to 73c, the second selecting unit 76 (displayed as selecting n waves out of m waves)
The n subcarriers are selected from the subcarriers, and the measurement result having the selection result is periodically transmitted to the transmitting side. In FIG. 1, the multi-carrier direct-sequence transceiver 50 is arranged opposite to a multi-carrier direct-sequence transmitter for code-multiplexing data to be transmitted and transmitting a radio signal using a plurality of subcarriers. An opposing multi-carrier direct-spread transmitter (multi-carrier direct-spread transceiver 90) has a multi-carrier direct-spread receiver that receives a radio signal that is code-multiplexed and transmitted using a plurality of subcarriers. The multi-carrier direct-sequence transmission unit includes a first selection unit 11 and a transmission unit 3
0a, the multi-carrier direct spread receiving section includes a receiving section 31a, an extracting section 74, and measuring sections 73a to 73c.
And a second selection unit 76.

Further, the multi-carrier direct-sequence transmitter (multi-carrier direct-sequence transmitter / receiver 50) selects the n sub-carriers from the m sub-carriers based on the quality measurement result on the receiving side. 11 is connected to the first selecting unit 11 and inserts a pilot signal into data to be transmitted, code-multiplexes the same, transmits a radio signal using each of the selected n subcarriers, and selects This means that the transmitting section 30a for transmitting the pilot signal on the (mn) subcarriers is provided.

In addition, the multi-carrier direct-spreading receiver (multi-carrier direct-spreading transceiver 90) receives a radio signal that has been code-multiplexed and transmitted using m subcarriers, detects transmission data, and detects transmission data. , A receiving unit 31a that extracts a pilot signal transmitted periodically, and an extracting unit 74 that is connected to the receiving unit 31a and extracts data that is divided into n subcarriers and inserted.
And measuring units 73a to 73c that are connected to the receiving unit 31a, measure the quality of each of the m subcarriers using the pilot signal, and output the measurement results, and are connected to the measuring units 73a to 73c. A second selection unit for selecting n subcarriers on which data is transmitted from the subcarriers based on the received data and periodically transmitting the measurement result to the transmission side; It was done.

With such a configuration, the quality of the subcarrier is measured on the receiving side, and the measurement result is fed back to the transmitting side. FIG. 5 is a flowchart of the transmission / reception method according to the first embodiment of the present invention. First,
For the m subcarriers, the multicarrier direct spread transceiver 90 performs quality measurement, and returns the measurement result to the multicarrier direct spread transceiver 50 (step A1). Next, the multi-carrier direct-sequence transceiver 50 selects n sub-carriers of good quality and performs data transmission (information transmission) (step A2). It receives (step A3). Further, the loop of these steps A1 to A3 is repeated.

Therefore, a subcarrier of good quality is always adaptively selected every time data is transmitted. As described above, under frequency selective fading, data is transmitted using the subcarrier band with high transmission quality and data is not transmitted in the subcarrier band with low transmission quality, so that high-quality and high-speed data transmission is achieved. It becomes possible.

Further, since subcarriers are adaptively selected during communication, efficient frequency use is possible. Then, in this way, the difference between the peak transmission power and the average transmission power is reduced, so that the usage efficiency of the amplifier can be improved. (A1) Description of First Modification of First Embodiment of the Present Invention In the first embodiment, the method of selecting a subcarrier on the receiving side can be performed by another method. Two methods will be described.
Other methods of quality measurement will be described.
In this modification, other embodiments, and other modifications, wireless transmission and reception are performed under frequency selective fading unless otherwise specified.

FIG. 6 is a block diagram of a multi-carrier direct spread transceiver 50a according to a first modification of the first embodiment of the present invention. The multi-carrier direct spread transceiver 50a shown in FIG. 6 is used in a mobile radio communication system using the CDMA system, and the function of the pilot signal insertion units 13d to 13f is different from that of the multi-carrier direct It differs from that of pilot signal insertion sections 13a to 13c in spreading transceiver 50.

That is, the pilot signal insertion unit 13 in the transmission unit 30c of the multicarrier direct spread transceiver 50a
Each of d to 13f inserts the selection information relating to the subcarrier number on which the transmission data is superimposed into the control information area relating to the transmission speed in the transmission data. Then, the selection information is extracted at the receiving side, and the receiving side selects the subcarrier on which the transmission data is superimposed in accordance with the selection signal.

The components shown in FIG. 6 having the same reference numerals as those described above have the same or similar functions, and further description will be omitted. FIG.
(A) is a figure showing an example of a data format concerning the 1st modification of a 1st embodiment of the present invention. This FIG.
One of the data strings shown in FIG.
3 of the portion described as and the portion described as DATA
It has different types of regions. P indicates a pilot signal, and RI indicates transmission rate information (Rate In).
This RI corresponds to an area of control information related to the transmission rate. In addition, DA
TA is an area for storing data to be transmitted. In addition,
This data format has the same configuration in other embodiments and modified examples described later. This allows
Control information can be transmitted and received using an existing data format.

FIG. 7 is a block diagram of an opposed multi-carrier direct spread transceiver 90a according to a first modification of the first embodiment of the present invention. The multi-carrier direct-sequence transceiver 90a shown in FIG. 7 is also used in a mobile radio communication system using the CDMA system. Detectors 68d, 68e, 68f, 69d, 69
e, 69f, 70d, 70e, and 70f in that control information is extracted.

Correlation detectors 68d and 68 shown in FIG.
e, 68f, 69d, 69e, 69f, 70d, 70
e, 70f, respectively, for the sub-carrier frequency f ₁ ~f _m outputted from the filter 67a to 67c, a pilot signal with a respective delay wave arriving from a plurality of directions despreading process and outputs a detection signal The control information extracting unit 20a is provided on the output side of the multiplier 14a. Then, the control information extracting unit 20a is connected to the multiplier 14a and the extracting unit 74, extracts control information transmitted by the multicarrier direct spread transceiver 50a from the received signal, and extracts selection information included in the control information. The data is input to the extraction unit 74. In other words, the extraction unit 74 of the multicarrier direct spread transceiver 90a selects n subcarriers based on the control information.

The components shown in FIG. 7 having the same reference numerals as those described above have the same or similar functions, and further description will be omitted. With such a configuration, the multi-carrier direct spread transceiver 50a
(See FIG. 6) superimposes the selection information on the transmission data, and the multi-carrier direct spread transceiver 90a extracts the selection information and grasps the numbers of the n subcarriers used for transmission. Then, the multi-carrier direct-sequence transceiver 90a returns the quality measurement result of the received subcarrier to the transmitting side, and the multi-carrier direct-sequence transceiver 50a
Adaptively changes the subcarriers used for transmission based on the quality measurement results.

As described above, since the quality measurement result is fed back and the multicarrier direct spread transceiver 50a dynamically selects the subcarrier, high quality data transmission can be performed. Subsequently, a second subcarrier selection method will be described. This selection method is a method in which the transmission unit 30c of the multicarrier direct spread transceiver 50a inserts selection information (the number of a subcarrier on which transmission data is superimposed) into an area where transmission data is stored. That is, FIG.
While the selection information is inserted into the data area DATA of the multi-carrier direct-spreading transceiver 90a, the extraction unit 74 of the multi-carrier direct-spreading transceiver 90a extracts the selection information included in the DATA. 90
“a” knows n subcarriers to which data is transmitted from m subcarriers.

Next, a method of measuring quality will be described.
The received pilot signal is performed using an amount shifted from a symbol point (signal point) on the signal plane. FIG.
(B) is an explanatory diagram of quality measurement according to a first modification of the first embodiment of the present invention. In the signal plane shown in FIG. 8B, four symbol points and received signal points (indicated by arrows) are displayed. Here, the modulation method is, for example, Q
PSK is used.

The receiving side defines one of these symbol points as a pilot signal, and uses the average value of the plurality of pilot signals and the deviation of each pilot signal as quality information for quality measurement. It is supposed to. That is, the measuring units 73a to 73c (see FIG. 7)
In each case, the quality is measured based on the sum of the deviations of the received pilot signals from the symbol points.

Specifically, when the amplitude values of a plurality of pilot signals are r _i and the average value of the amplitude values of a plurality of received signals is r _ave , the quality information Q is expressed by the following equation (1).
become that way. Q = (1 / k) × Σ k i = 1 (r i -r ave) ** 2 ... (1) Here, Σ ^k _{i = 1} is, i have i is a natural number represents the sum total of from 1 to k And k represents the above k. In addition, (r _i -r
_ave) ** 2 represents the square calculation of (r _i -r _ave), r
_ave is, for example, the average of the amplitude values over five times. Based on the quality information Q, the multi-carrier direct-spreading transceiver 90a selects m and n, so that the sub-carrier is independently selected without depending on the selection information on the transmission side.

With this configuration, information on subcarriers is transmitted and received in the same manner as in the first embodiment.
Under frequency selective fading, data is transmitted using a subcarrier band with high transmission quality, and data transmission using a subcarrier band with low transmission quality is avoided. Thus, high-quality and high-speed data transmission is possible. Further, as described above, subcarriers are adaptively selected during communication, so that efficient frequency use is possible.

Since the difference between the peak transmission power and the average transmission power is reduced in this way, the usage efficiency of the amplifier is improved. (A2) Description of Second Modification of First Embodiment of the Present Invention The duplex system of the multi-carrier direct sequence transmission / reception system 40 in the first embodiment is a frequency division duplex, but a time division duplex (TDD). Duplex) can also be used.

FIG. 9 is a configuration diagram of a multicarrier direct spread transmission / reception system 40a according to a second modification of the first embodiment of the present invention. The multi-carrier direct spread transmission / reception system 40a shown in FIG. 9 is a mobile radio communication system using a CDMA system, and includes a multi-carrier direct spread transceiver 51 and a multi-carrier direct spread transceiver 91. I have.

Here, the multi-carrier direct-sequence transmitter / receiver 51 code-multiplexes data to be transmitted and transmits a radio signal using a plurality of subcarriers. 1 selecting unit 11, transmitting unit 30a, antenna 19e, coupler 32, receiving unit 31a, measuring units 73a to 73c, extracting unit 74,
It comprises a parallel-to-serial converter 75. Here, the antenna 19e is an antenna for transmitting and receiving a radio signal, and the coupler 32 is connected to the antenna 19e.
And separates the transmission signal from the reception signal. Further, a multi-carrier direct spread transmission unit (first selection unit 11, transmission unit 30a) and a multi-carrier direct spread reception unit (reception unit 31a, measurement units 73a to 73c, extraction unit 7)
4) is symmetrical. In addition, with these things,
Those having the same reference numerals as those described above have the same or similar functions, and therefore, duplicate description will be omitted.

As a result, the multi-carrier direct-sequence transceiver 51 receives the radio signal transmitted by the multi-carrier direct-sequence transceiver 91 and extracts quality measurement information relating to subcarriers from the radio signal. On the other hand, the multi-carrier direct spread transceiver 91 is the same as the multi-carrier direct spread transceiver 90, and the antenna 1
9e, coupler 32, receiving section 31a, measuring section 73a
73c, a second selector 76, an extractor 74, a parallel / serial converter 75, a serial / parallel converter 10, a first selector 11, and a transmitter 31b. . Among these, those having the same reference numerals as those described above have the same or similar functions, and thus redundant description will be omitted. The multi-carrier direct-sequence transceiver 91 also has a multi-carrier direct-sequence transmitter (first selector 11, transmitter 31b).
And the multi-carrier direct spread receiving section (receiving section 31a, measuring sections 73a to 73c, second selecting section 76, extracting section 74) are symmetrical.

Further, regarding the selection of subcarriers,
Transmitter 30a of multicarrier direct spread transceiver 51
Is configured to insert the selection information regarding the subcarrier number on which the transmission data is superimposed into the transmission data area, and the extraction unit 74 of the multicarrier direct spread transceiver 91 uses the You have to choose a career.

In addition, the measuring units 73a to 73c in the multi-carrier direct spreading transceiver 91 measure the quality based on the total value of the deviation of the received pilot signal from the symbol point. The quality may be measured by RSSI indicating the electric field strength. As described above, when the duplex system is TDD, the circuit configuration becomes symmetrical, so that a conversion circuit for other frequencies is not required unlike FDD, and the circuit can be miniaturized. Further, since the duplex system is TDD, the frequency use efficiency is improved.

In this way, high-quality and high-speed data transmission can be performed under frequency-selective fading, and subcarriers are adaptively selected during communication, so that efficient frequency utilization can be achieved. It becomes possible. Furthermore, since the difference between the peak transmission power and the average transmission power is reduced in this way, it is possible to improve the usage efficiency of the amplifier.

(B) Description of the Second Embodiment of the Present Invention FIG. 10 is a configuration diagram of a multicarrier direct spread transmission / reception system according to the second embodiment of the present invention. The multi-carrier direct spreading transmission / reception system 40b shown in FIG.
This is a mobile radio communication system using a DMA system, and includes a multi-carrier direct spread transceiver 50b and a multi-carrier direct spread transceiver 90b.

The multi-carrier direct spread transmission / reception system 40b is a system for transmitting and receiving the same data through N-wave (N is a natural number) channel (hereinafter, sometimes referred to as an N-wave system). Here, when N is 4, a comparison between the second embodiment and the first embodiment will be described.
This will be described with reference to FIGS. 11A and 11B and FIGS. 12A and 12B.

FIGS. 11A and 11B are explanatory diagrams of a four-wave system. The data to be transmitted input from the left side of FIG. 11A is copied in four directions, multiplied by a code in a multiplier 14a, and then multiplied by a subcarrier in a multiplier 14b. , And are transmitted by the adder 19a, and the same transmission data is transmitted using each of the subcarriers shown in FIG. 11B.

On the other hand, FIGS. 12A and 12B are explanatory diagrams of a quarter wave system. This 1/4
The wave system means that the total input transmission data is reduced to 1/4. That is, when the transmission data of, for example, 20 Mbps is input from the left side of FIG. In addition, 1 shown in FIG.
Of the four sub-carriers denoted by ４4, data of different users are transmitted to the sub-carriers denoted by 1, 3 respectively, and the sub-carriers denoted by 2, 4 The data of the same user is divided and transmitted. In other words, the parameter for one user is determined by the total number of subcarriers and the number of subcarriers actually used for transmission, and this parameter indicates how many waves are transmitted and how many. Further, it is also possible to transmit with a different number of subcarriers for each user.

FIG. 13 is a block diagram of a multi-carrier direct spread transceiver 50b according to the second embodiment of the present invention. The multi-carrier direct spread transceiver 50b shown in FIG. 13 is for code-multiplexing data to be transmitted and transmitting a radio signal using a plurality of subcarriers.
Transmitting unit 30d, control signal output unit 16, and receiving unit 30b
And antennas 19c and 19d. In addition, the duplex method of the present embodiment is FDD.
It is.

Here, transmitting section 30d inserts a pilot signal into data to be transmitted and code-multiplexes the same, and inserts the same data into each of k subcarriers separated by a predetermined frequency from n subcarriers. Modulator 12a to 12c and a pilot signal insertion unit 1
3a to 13c, power increasing / decreasing units 18a to 18c, a plurality of multipliers 14a, 14b, 14c, and a plurality of adders 15,
19a, filters 17a to 17c, and an amplifier 19b. Note that n represents a natural number of 2 or more, and k represents a natural number of n or less.

The power increasing / decreasing units 18a to 18c include:
Each increases or decreases the transmission power of the data output from the pilot signal insertion units 13a to 13c by an external control signal. Further, the control signal output unit 16 is connected to the transmission unit 30d, and can control increase / decrease of transmission power according to a transmission power command,
Functions as a control unit. Each of the pilot signal insertion units 13a to 13c adds a pilot signal composed of a known signal to transmission data in k subcarriers, and functions as an addition unit.

In addition to the above, those having the same reference numerals as those described above have the same or similar functions, and therefore, duplicate explanations will be omitted. This allows
The data to be transmitted input from the left side of FIG.
The signals are branched and input to the modulators 12a to 12c, respectively, and pilot signals are inserted in pilot signal insertion units 13a to 13c. Then, the power increasing / decreasing units 18a to 1
At 8c, the transmission power of the data output from pilot signal insertion units 13a to 13c is increased or decreased based on the control signal output from control signal output unit 16.

Further, the data output from the power increasing / decreasing units 18a to 18c are multiplied by the orthogonal code by a plurality of multipliers 14a, and added to other user signals by a plurality of adders 15, The data output from each of these adders 15 is multiplied by a long code by each of a plurality of multipliers 14b, and further, a filter 17a
-17c are output after being band-limited. Then, the output data is multiplied by a subcarrier output from an oscillator (not shown) to generate an adder 19a.
At, those data are added, and at the amplifier 19b,
The signal is amplified and output from the antenna 19c to the radio channel.

FIG. 14 is a layout diagram of a transmission spectrum according to the second embodiment of the present invention. The transmission lines in the spectrum shown in FIG.
The data to be transmitted is divided into four subcarriers and transmitted. Further, the frequency interval denoted by Δf is equal to the subcarrier interval multiplied by the multiplier 14c in the transmission unit 30d shown in FIG. Here, the parameters are the total number of subcarriers 12 and the number of subcarriers 4 used for data transmission.

FIG. 15 is a block diagram of a facing multicarrier direct spread transceiver 90b according to the second embodiment of the present invention. The multi-carrier direct spread transceiver 90b shown in FIG.
(See FIG. 13), and receives a radio signal that is code-multiplexed and transmitted using a plurality of subcarriers, and includes two antennas 19d and a receiving unit 3
1c, a measurement unit 80, a TPC command generation unit (control command generation unit) 81, and a synthesis command generation unit (T
(PC) 82a, a transmission power control command section 82b, a transmission section 31b, and an antenna 19c.

Here, each of the two antennas 19d is a diversity antenna and outputs a received signal as an A branch and a B branch, and the receiving unit 31c is a multi-carrier direct spread transceiver 50b. Receives the radio signal transmitted using the k subcarriers transmitted by the controller, and outputs a signal derived from the radio signal. The plurality of multipliers 14c and the filter 67
a to 67c, correlation detectors 68g, 69g, 70g,
Rake receiving sections 72d to 72f and maximum ratio combining section 79a
And a signal determination unit 79b.

Here, the correlation detectors 68g, 69g, 70
g despreads the received signal output from the antenna 19d. Also, the Rake receiving unit 72
d to 72f each rake-receives the received signal output from the antenna 19d, and the maximum ratio combining unit 79a sets the time and phase of the signal output from each of the rake receiving units 72d to 72f. All together,
It outputs a signal having a large power. The signal determining section 79b determines the symbol of the signal output from the maximum ratio combining section 79a.

Thus, for example, the subcarrier frequency f
The signal flow for _one received signal is as follows. That is, each of the branch A received by one antenna 19d and the branch B received by the other antenna 19d is frequency-converted by the multiplier 14c, and only the desired frequency component is filtered by the filter 67a. Taken out. Next, the signals of the branches A and B are despread by the correlation detector 68g, respectively, and
Rake is received in 2d. Subsequently, a signal having a large signal power is output by the maximum ratio combining unit 79a, and the signal symbol is determined by the signal determining unit 79b. The sub-carrier frequency f _2, the same applies to the sub-carrier frequency f _m.

The measuring unit 80 is connected to the receiving unit 31c, measures the quality of each of the k subcarriers, outputs an individual measurement result, and outputs the individual measurement results. And outputs a combined measurement result. The SIR measuring section 80a-80c and a combined SIR measuring section 80d are provided. Here, the SIR measurement unit 80a
Nos. To 80c measure the SIR (Signal Interference Ratio) for each of the k subcarriers and output the individual measurement results for each subcarrier. In addition, the post-synthesis SIR measurement unit 80
d is for measuring the SIR of a combined carrier obtained by combining k subcarriers and outputting a combined measurement result.

Accordingly, the quality of the received signal is measured for each of the k subcarriers and the quality of the combined signal of all the k subcarriers. Further, the TPC command generation unit 81 is connected to the measurement unit 80, and increases or decreases the transmission power level of each of the k subcarriers based on the individual measurement result.
Control command (TPC command: Tr
output power control command). The control command refers to control information for returning, on the receiving side, the increase, decrease, or maintenance of the transmission power for each subcarrier to the transmission side based on the reception power of each subcarrier.

As a result, on the receiving side, quality measurement is performed on, for example, eight subcarriers, and for example, the transmission power of the first subcarrier is increased, the transmission power of the second subcarrier is reduced, or Control information indicating that the transmission power of the third subcarrier can be used as is is transmitted from the receiving side to the transmitting side. Then, the transmitting side performs transmission power control based on the control command transmitted from the receiving side. That is, the transmission power control command unit 82b, the transmission unit 31b, and the antennas 19c and 19 shown in FIG.
d, the receiving unit 30b, and the control signal output unit 16 cooperate to form a feedback loop 100a.

Next, the control command will be described with reference to FIGS. 16 and 17 (a) to 17 (e). FIG. 16 is an explanatory diagram of the fading level according to the second embodiment of the present invention. A curve L shown in FIG. 16 represents the selectivity fading level, and among subcarriers f _{1 to} f ₈ , f
_1, the data using a four-wave of f _3, f _5, f ₇ is transmitted. Here, the subcarrier f ₁ is received at the receiving side at a level higher than the transmission level, and both the subcarriers f ₃ and f ₅ are received at the receiving side at a level lower than the transmission level. , Subcarrier f ₇ is received at the receiving side at substantially the same level as the transmission level. Therefore, the receiving side transmits a control command to the transmitting side based on these subcarrier reception levels.
Specifically, the subcarrier f ₁ is down (do
wn), the sub-carriers f ₃ and f ₅ are raised (up), and the sub-carrier f ₇ is left as it is (stay).

In FIG. 15, the combined command generator 82a is connected to the measuring unit 80, and outputs a control command indicating increase, decrease or maintenance of the combined carrier as a combined command based on the combined measurement result. . Further, the transmission power control command section 82b is connected to the TPC command generating section 81 and the combined command generating section 82a, and compares the number of matched control commands with the combined command with a predetermined threshold value, For each of the subcarriers, the increase, decrease, or maintenance of the transmission power is determined, and the content of the determination is output as a transmission power control command.

Then, using the combined command obtained by combined command generating section 82a, transmission power control command section 8
2b performs separate transmission power control under a flat fading environment and under a selective fading environment,
In the case of selective fading, different processing is performed depending on whether the number of matches exceeds the threshold or not. Here, the case of flat fading will be described with reference to FIGS. 17A and 17B, and the case of selective fading will be described with reference to FIGS.
This will be described with reference to (c) to (e).

FIGS. 17A and 17B are explanatory diagrams of transmission power control in flat fading, respectively.
The matrices shown in FIGS. 17A and 17B are composed of three columns, and the left column stores the combined carrier (shown as the whole) and the subcarrier number k (0 to 7). In the middle column, the combined measurement results (up, down) generated by the combined command generator 82a and the individual measurement results (up, down) for each of the eight subcarriers generated by the TPC command generator 81. Is stored. Further, the contents (up, down) of the transmission power control for each of the subcarriers 0 to 7 generated by the transmission power control command unit 82b are stored in the right column.

Here, when the combined measurement result shown in the uppermost row in the middle column of FIG. 17A is up, the contents of the transmission power control for each subcarrier are all up, and this content is Will be replied to. If the combined measurement result shown in the uppermost row in the middle column of FIG. 17B is down, the contents of the transmission power control for each subcarrier are all down, and this content is returned to the transmitting side. It is.

Next, at the time of selective fading, the transmission power control command section 82b, if the number of coincidences exceeds the threshold value, sets the transmission power control to make all the transmission powers of the k subcarriers coincide with the combined command. Output an instruction. That is, if the number of coincidences between the individual measurement result for each subcarrier and the combined measurement result exceeds 3 when the threshold value is 3, all eight subcarriers match the combined measurement result. To make it work.

FIGS. 17C and 17D are diagrams for explaining transmission power control in selective fading, respectively.
FIG. 7C shows a case where the number of coincidences between the individual measurement result for each subcarrier and the combined measurement result of the combined carrier exceeds the threshold value. The combined measurement result shown at the top of the middle column of FIG. 17C is up, and the individual measurement result for each subcarrier is up, down, down, Up, up, down, down, up. Accordingly, the number of ups is four with the numbers 0, 3, 4, and 7, which exceeds the threshold of three. Therefore, the transmission power control command unit 82b sets the eight The transmission power control of the content for raising all the subcarriers is returned to the transmission side. The subcarriers with numbers 0, 3, 4, and 7 are:
Since the data is transmitted in the up state, "stay" is displayed as shown in the right column of FIG. 17C.

The transmission power control command section 82b
If the number of coincidences does not exceed the threshold value, a transmission power control command is output to determine that there is no increase or decrease for subcarriers having transmission power matching the combined command, and for subcarriers having transmission power not matching the combined command. Outputs a transmission power control command to make the transmission power coincide with the combining command. That is, when the threshold value is 4, if the number of coincidences between the individual measurement result for each subcarrier and the combined measurement result of the combined carrier does not exceed 4, the number of subcarriers that match the combined measurement result is increased or decreased. The transmission power control with the content of "none" is generated, and the subcarriers not matching the combined measurement result are matched with the combined measurement result.

FIG. 17D shows a case where the number of coincidences between the individual measurement result for each subcarrier and the combined measurement result of the combined carrier is equal to or smaller than the threshold value. The combined measurement result shown at the top of the middle column of FIG. 17D is down, and the number of down measurements for individual measurement results for each subcarrier is number 1,
There are four with 2, 5, and 6. Then, in this case, the subcarriers (numbers 1, 2, 5,
6), the contents of the transmission power control are kept as they are, and unmatched subcarriers (number 0,
(3, 4, and 7) are changed in transmission power control so as to match the combined measurement result.

In other words, the transmission power control command section 82b
If the number of matches between the control command and the combined command exceeds the threshold, all k subcarriers are matched with the combined command. Otherwise, for the subcarriers that match the combined command, Generate a control command that does not increase or decrease, and match subcarriers that do not match the combined command with the combined command,
Thus, the increase / decrease operation is performed by inverting the determination for the k subcarriers.

FIG. 17E is an explanatory diagram of an increasing / decreasing method according to the second embodiment of the present invention. The upper part of the frame shown in FIG. 17E shows the case where the horizontal direction is the subcarrier number, for example, the number of subcarriers is 10. The lower part of this frame indicates the transmission power control amount of each subcarrier.
Then, the transmission power control command unit 82b determines the increase / decrease regarding the number of control commands and the number of combined commands in accordance with the number i of the series in which increase or decrease continues, and sets an upper limit value for the number of increase / decrease. , 2 (i-
1) Increase / decrease by the power. Note that a run means that the same thing is repeated, and i represents a natural number of 2 or more.

For example, when the control command of the subcarrier number 0 is up, the up amount is set to 1 (2 to the power of 0). When the subcarrier number 1 is also up, the up amount is set to 2 (2 to 1). ), And if the subcarrier number 2 is also up, the number of up runs is 2
Therefore, the up amount is 4 (2 square). Subsequently, when the subcarrier number 3 is up and the upper limit M of the up amount is 4, it does not become 8.

Therefore, according to this method, the frequency selectivity of fading is used, and a large up amount is set for a subcarrier having a deep drop.
In addition, a small up amount is set for a subcarrier having a shallow drop. By performing the transmission power control in this manner, the characteristics are improved. Further, as described above, the influence of frequency selective fading is reduced.

In FIG. 10, a multi-carrier direct-sequence transmitter (multi-carrier direct-sequence transmitter / receiver 50)
b) includes a transmitting unit 30d that inserts a pilot signal into data to be transmitted, code-multiplexes the same, and inserts and transmits the same data to each of k subcarriers separated by a predetermined frequency from n subcarriers. , A control signal output unit 16 connected to the transmission unit 30d and capable of controlling increase and decrease of transmission power according to a transmission power command, and a pilot signal insertion unit for adding a pilot signal composed of a known signal to transmission data with k subcarriers 13a to 13c.

The multi-carrier direct-sequence receiver (multi-carrier direct-sequence transmitter / receiver 90b) receives a radio signal which is code-multiplexed and transmitted using k subcarriers, and converts a signal originating from the radio signal. A receiving unit 31c for outputting the signal, and measuring the quality of each of the k subcarriers to output an individual measurement result and the quality of the combined carrier obtained by combining the k subcarriers. A measuring unit 80 that measures and outputs a combined measurement result; and a control unit that is connected to the measuring unit 80 and that outputs a control command indicating increase, decrease, or maintenance for each of the transmission power levels of the k subcarriers based on the individual measurement result. The TPC command generation unit 81 performs the increase, decrease, or maintenance of the combined carrier based on the combined measurement result. A combining command generating section 82a of the control command output as a composite command representing a, TP
The C command generation unit 81 and the combination command generation unit 82a are connected to each other and transmit the transmission power control regarding the transmission data to the transmission side. And a TPC command unit 82b that performs independent power control for each subcarrier and transmits a control command to the transmission side using the quality measurement result of the subcarrier.

With such a configuration, feedback based on the reception quality is performed. FIG. 18 is a flowchart of a transmission / reception method according to the second embodiment of the present invention. First, quality measurement is performed for k subcarriers (step B1), and transmission power control commands for k subcarriers are generated (step B).
2). Subsequently, the signals transmitted by the k subcarriers are combined, and the quality of the signals is measured (step B3), and the combined signal (combined signal)
Is generated (step B4).

Further, a transmission power signal for each subcarrier is determined from the combined transmission power control signal and the individual power control signals (step B5). A signal is transmitted (step B6). Then, the processing of these steps B1 to B6 is repeated. In this way,
In a multipath propagation path having a time variation, unnecessary increase in transmission power can be avoided, and the receiving side receives the signal with appropriate power, thereby improving power efficiency.

(B1) Description of First Modification of Second Embodiment of the Present Invention In the second embodiment, the allocation of subcarrier frequencies can be changed. FIG. 19 is a block diagram of a multicarrier direct spread transceiver 50e according to a first modification of the second embodiment of the present invention. The multi-carrier direct-sequence transceiver 50e shown in FIG. 19 is used in a mobile radio communication system using the CDMA system, and includes a transmitting unit 30e, a control signal output unit 16a, and a receiving unit 30b.
And antennas 19c and 19d. In addition, the duplex method of the present embodiment is FDD.
It is. In FIG. 19, those having the same reference numerals as those described above have the same or similar functions, and further description will be omitted. Also, in this modification, a configuration similar to that of the multi-carrier direct spread transmission / reception system 40b (see FIG. 10) is employed.

Here, the control signal output unit 16a transfers a subcarrier for transmitting data to a different subcarrier and allocates a different spreading code to the subcarrier based on a subcarrier frequency change command transmitted by the receiving side. It is. Here, the control signal output unit 16a will be described with reference to FIGS. FIG.
0 (a) and (b) are layout diagrams of the transmission spectrum according to the first modification of the second embodiment of the present invention, and the respective spectra are numbered from 1 to 12, respectively. Note that the frequency interval denoted by Δf is equal to the subcarrier interval.

First, the multi-carrier direct-sequence transmitter / receiver 50e has the numbers 1, 4, 7,.
The data of the user is carried using the subcarrier denoted by 10. When the quality of the subcarrier 7 is degraded, the multi-carrier direct spread transceiver 50
e changes the subcarrier from 7 to 8 as shown in FIG. 20 (b).

FIG. 21 is a block diagram of an opposing multicarrier direct spread transceiver 90e according to a first modification of the second embodiment of the present invention. Multicarrier direct spreading transceiver 90e shown in FIG. 21 is arranged opposite to multicarrier direct spreading transceiver 50e (see FIG. 19), and is a radio signal that is code-multiplexed and transmitted using a plurality of subcarriers. And two antennas 19d
Receiving section 31c, measuring section 80, TPC command generating section (control command generating section) 81, combined command generating section (combined TPC) 82a, and transmission power control command section 82
b, a threshold value comparison / frequency change instruction generation unit 82d,
It comprises a transmitting section 31b and an antenna 19c. In FIG. 21, those having the same reference numerals as those described above have the same or similar functions, and further description will be omitted.

The threshold value comparison / frequency change command generation unit 82d is connected to the measurement unit 80, compares the measurement result with a predetermined quality reference value, and selects among the k subcarriers transmitting the same data. Multi-carrier direct spreading transceiver 50e for subcarriers that do not satisfy a predetermined quality criterion value
Is required to change the frequency. With such a configuration, the frequency is changed. FIG. 22 is a flowchart of a transmission / reception method according to a first modification of the second embodiment of the present invention.

First, quality measurement is performed for k subcarriers (step D1), and a transmission power control command for k subcarriers is generated (step D2). Subsequently, the signals transmitted on the k subcarriers are combined, the quality of the signals is measured (step D3), and a transmission power control command for the combined signal (combined signal) is generated. (Step D4).

Further, a transmission power signal for each subcarrier is determined from the combined transmission power control signal and the individual power control signal (step D5), and the transmission power control signal is transmitted (step D6). Also, subcarriers that do not meet the quality standards are changed to other subcarriers,
The data to be transmitted is transferred (step D7). Then, the processing of these steps D1 to D7 is repeated.

As described above, a predetermined threshold value is set as a quality criterion in a multipath propagation path having a time variation.
Of the plurality of subcarriers transmitting the same signal, those that do not satisfy the quality standard are transferred to subcarriers of different frequencies, so that the power efficiency of the transmitting amplifier is improved. (B2) Description of Second Modification of Second Embodiment of the Present Invention In the second embodiment, the code assignment can be changed.

FIG. 23 is a block diagram of a multi-carrier direct spread transceiver 50f according to a second modification of the second embodiment of the present invention. The multi-carrier direct spread transceiver 50f shown in FIG. It has a portion 16b.
Here, the plurality of multipliers 14a in the transmission unit 30e encode the data to be transmitted using the combined orthogonal codes that are mutually orthogonal between the users. For example, 2
When the original data of the user is divided and transmitted using three subcarriers, the three data carried using the three subcarriers are combined to make the original data orthogonal between the users. Let it do. That is, the subcarriers are not orthogonal to each other but are orthogonal to each other between users.

FIG. 24 shows an opposed multicarrier direct spread transceiver 9 according to a second modification of the second embodiment of the present invention.
It is a block diagram of 0f and the receiving part 31d is displayed. 23 and 24, and those having the same reference numerals as those described above have the same or similar functions, and further description will be omitted.
Also, in this modification, a configuration similar to that of the multi-carrier direct spread transmission / reception system 40b (see FIG. 10) is employed.

With this configuration, the same information is transmitted using k subcarriers that are distant from each other in frequency out of the total number n of subcarriers, and transmitted on the receiving side using these k subcarriers. The signals are detected by combining the data. FIG. 25 is a layout diagram of a transmission spectrum according to a second modification of the second embodiment of the present invention. The subcarrier denoted by 1 shown in FIG. 25 accommodates three users A, B, and C. The data transmitted by the user C is divided into subcarriers labeled 4, 7, and 10, and transmitted.

As a result, the user A and the user B
The data of the user C obtained by combining all of the subcarriers 1, 4, 7, and 10 are orthogonal to each other. And
As described above, since user identification is performed using the orthogonal codes after synthesis, the number of orthogonal codes that can be assigned increases. In addition, since the number of orthogonal codes increases as described above,
Subscribers can be increased.

(B3) Description of the Third Modification of the Second Embodiment of the Present Invention The duplex system in the second embodiment and the first and second modifications thereof is FDD, but it should be TDD. You can also. FIG. 26 is a configuration diagram of a multicarrier direct-sequence transmission / reception system 40c according to a third modification of the second embodiment of the present invention. The multi-carrier direct-sequence transceiver 51a and the multi-carrier direct-sequence transceiver 91a shown in FIG. 26 each code-multiplex data to be transmitted and transmit a radio signal using a plurality of subcarriers. The transmitting unit 31b and the antenna 19e
, Coupler 32, receiving section 31c, control signal output section 1
6, a measurement unit 80, a TPC command generation unit 81, a combined command generation unit 82a, and a transmission power control command unit 82b.
It is configured with and. In these, the transmission part and the reception part are symmetrical. Those having the same reference numerals as those described above have the same or similar functions, and thus redundant description will be omitted.

With such a configuration, transmission and reception can be performed in the same manner as in the case where the duplex system is FDD. Also,
If TDD is used, the circuit can be configured symmetrically.
The circuit for feedback required in D becomes unnecessary, and the circuit can be downsized. Since the duplex system is TDD, the frequency use efficiency is improved. Further, in this way, even under frequency selective fading, high quality and high speed data transmission becomes possible, and since subcarriers are adaptively selected during communication, efficient frequency utilization becomes possible. Become.

Further, since the difference between the peak transmission power and the average transmission power is reduced in this way, it is possible to improve the use efficiency of the amplifier. (C) Description of Third Embodiment of the Present Invention A mode in which the receiving side measures the quality of each subcarrier and the transmitting side changes the subcarrier based on the quality measurement result can be used for another method. FIG. 27 shows a multicarrier transmission / reception system 40 according to the third embodiment of the present invention.
f is a configuration diagram of the third embodiment, and the first and second modifications of the third embodiment have the same system configuration. The multicarrier transmission / reception system 40f performs radio transmission / reception under frequency selective fading.

FIG. 28 is a block diagram of a multi-carrier transceiver 52 according to the third embodiment of the present invention, and the duplex system is FDD. The multi-carrier transceiver 52 shown in FIG. 28 transmits a radio signal using m subcarriers for data to be transmitted,
Antennas 19c, 19d, serial / parallel converter 10, dummy bit insertion unit (suppression bit insertion unit) 85
, The transmission unit 33, the reception unit 30b, and the control signal output unit 1.
6 is provided. Note that m represents a natural number of 2 or more.

Here, the dummy bit inserting section 85 inserts dummy bits into (mn) subcarriers in order to suppress the peak power of m subcarriers based on the quality information on n subcarriers. Is what you do. That is, transmission data is superimposed on n subcarriers,
Dummy bits for peak suppression are inserted into the remaining (mn) subcarriers. These dummy bits can reduce the difference between the peak power when the transmission data is inserted and the peak power when the transmission data is not inserted. Note that n represents a natural number of m or less.

The transmitting section 33 is connected to the dummy bit inserting section 85, transmits the data to be transmitted by using each of the selected n subcarriers, and does not select the data. A pilot signal is transmitted on mn) subcarriers. Other than these, those having the same reference numerals as those described above have the same or similar functions, and thus duplicate description will be omitted.

FIG. 29 is a layout diagram of the transmission spectrum according to the third embodiment of the present invention. The interval between adjacent subcarriers is set to (1 + α) × (1 / T _S ),
The subcarriers are arranged so as not to overlap each other. Here, α represents the roll-off rate when a Nyquist filter is used as the filters 17a to 17c,
_S is one symbol time.

FIG. 30 is a block diagram of an opposing multicarrier transceiver according to the third embodiment of the present invention. The multi-carrier transmitter / receiver 92 shown in FIG. 30 is arranged to face the multi-carrier transmitter 52 and receives a radio signal transmitted using m subcarriers. , Receiving section 34, measuring section 73, extracting section 74a, parallel-serial converter 75, second selecting section 76, and transmitting section 31b.

Here, the receiving section 34 receives a radio signal transmitted using m subcarriers, detects transmission data, and extracts a pilot signal. , Filters 17a to 17c
And correlation detectors 68a to 68c. Further, measuring sections 73a to 73c each use pilot signals included in m subcarriers,
It measures the quality of the book subcarriers and outputs the measurement result. Here, the measuring units 73a to 73c each measure the quality based on the total value of the deviation from the symbol point of the received pilot signal (see FIG. 8B). Subcarrier quality can also be measured.

[0136] Further, the extracting unit 74a includes measuring units 73a to 73a.
73c, which selects n subcarriers from m subcarriers based on the measurement result, deletes dummy bits, and outputs the result. In addition, the second selection unit 76 is connected to the measurement units 73a to 73c, and transmits quality information on the selected n subcarriers to the transmission side using the n subcarriers.

[0137] Other than the above, duplicated descriptions of those having the same reference numerals will be omitted. Further, FIG.
7 multi-carrier direct spread transmission / reception system 40f
, The second selector 76, the transmitter 31b, the antenna 1
9c, 19d, the receiving unit 30b, and the control signal output unit 16 cooperate to form a feedback loop 100b. In FIG. 27, in order to transmit data to be transmitted using the m subcarriers, the multicarrier transmitter (multicarrier transceiver 52) transmits the m subcarriers based on the quality information on the n subcarriers. Dummy bit insertion unit 85 for inserting dummy bits into (mn) subcarriers in order to suppress the peak power of the carrier.
Is connected to the dummy bit insertion unit 85, and transmits data to be transmitted by transmitting a radio signal using each of the selected n subcarriers and (mn) unselected subcarriers. And a transmitting unit 33 for transmitting a pilot signal. In addition, the transmitting section 33 inserts a pilot signal temporally multiplexed into data to be transmitted and performs code multiplexing.

Similarly, a multi-carrier receiver (multi-carrier transceiver 92) receives a radio signal transmitted using m subcarriers, detects transmission data, and extracts a pilot signal. And measuring units 73a to 73c that are connected to the receiving unit 34, measure the quality of the m subcarriers using the pilot signal, and output the measurement results, and are connected to the measuring units 73a to 73c, and Extracting section 74a for selecting n subcarriers out of m subcarriers based on, and removing and outputting dummy bits inserted by the transmitting side;
3a to 73c, and a second selection unit 76 that transmits quality information on the selected n subcarriers to the transmitting side using the n subcarriers.

With such a configuration, transmission / reception in which dummy bits are inserted is performed. FIG. 31 is a flowchart of the transmission / reception method according to the third embodiment of the present invention. First, quality measurement is performed on the reception side for m subcarriers (step C1), and n subcarriers of good quality are selected from among them to transmit information (step C2). Further, a dummy signal for suppressing a peak is inserted into (mn) subcarriers (step C3), and information is transmitted and received (step C3).
4). Further, the loop of Step C1 to Step C4 is repeated.

Thus, the radio signal to be transmitted is transmitted only by the primary modulation without being multiplied by the orthogonal code or the long code. In this way, communication is performed using a frequency band that is not affected by fading among a plurality of subcarrier bands, and since the ratio between the average power and the peak power is reduced, the peak power can be suppressed, and the transmission amplifier can be used. Can be used efficiently.

In this way, the transmission power can be efficiently controlled without depending on the system specifications. (C1) Description of First Modification of Third Embodiment of the Present Invention Although the frequencies of the third embodiment are arranged so as not to overlap with each other, an OFDM system in which subcarriers overlap with each other may be used. .

FIG. 32 is a block diagram of a multicarrier transceiver 50d according to a first modification of the third embodiment of the present invention. Multi-carrier transceiver 50d shown in FIG.
Is to transmit data using m subcarriers,
A radio signal is transmitted, and the antennas 19c and 19
d, a dummy bit insertion unit 85, a serial / parallel converter 10, a transmission unit 33a, and a reception unit 30b. Here, the quality measurement result of the subcarrier received by the receiving unit 30b is stored in the dummy bit inserting unit 8
5 to form a feedback loop. Note that m represents a natural number of 2 or more.

FIG. 33 is a layout diagram of a transmission spectrum according to a first modification of the third embodiment of the present invention, in which subcarriers overlap each other. This interval is 1 / T
_S. FIG. 34 is a block diagram of a multicarrier transceiver 90d according to a first modification of the third embodiment of the present invention. Multicarrier transceiver 90d shown in FIG.
Are two antennas 19d, an antenna 19c, a receiving unit 34a, measuring units 73a to 73c, a parallel / serial converter 75, and an extracting unit (dummy bit deletion) 74a.
, A second selection unit (subcarrier selection) 76, and a transmission unit 3
1b and a delay element 87.

Here, the two antennas 19d output received signals as A branch and B branch, respectively, and perform antenna diversity in cooperation. The receiving section 34a receives a radio signal transmitted using m subcarriers, detects transmission data, and extracts a pilot signal. The DFT section (Discrete cosine Fourier Transformer)
m) 83, a plurality of synchronous detection sections 21, and an MRC section 84.

Here, the DFT section 83 performs an operation of discrete cosine transform, and the synchronous detection section 21 performs synchronous detection of the signal output from the DFT section 83, respectively. Further, the MRC unit 84 includes the synchronous detection unit 2
1, the space diversity signals from each of the antenna branches A and B are combined at the maximum ratio.

As a result, the received signal is subjected to discrete cosine transform in DFT section 83, and its output is synchronously detected in synchronous detection section 21 and maximum ratio combined in MRC section 84. It is. Also, the measuring units 73a to 73a to
73c measures the quality of the m subcarriers using the pilot signals included in the m subcarriers transmitted by the multicarrier transceiver 50d, and outputs the measurement results. Further, the extraction unit 74a is connected to the measurement units 73a to 73c, selects n subcarriers from m subcarriers based on the measurement results, and outputs the dummy bits after deleting the dummy bits. Then, the second selection unit 76 includes the measurement units 73a to 73c.
, And transmits quality information on the selected n subcarriers to the transmitting side using the n subcarriers. Further, the delay element 87 is connected to the second selector 76 and adjusts the time delay of each subcarrier signal arriving through different paths.

With this configuration, on the transmitting side, data to be transmitted is superimposed on n subcarriers, and dummy bits are inserted in the remaining (mn) subcarriers. . Then, the transmission speed of these data is reduced to 1 / m by serial-parallel conversion, modulated, and transmitted. On the other hand, on the receiving side, dummy bits are deleted from each subcarrier after detection, and a timing shift generated for each subcarrier is adjusted and demodulated and output.

Thus, in addition to the advantages described above,
Since dummy bits are inserted into (mn) subcarriers, the peak power of m subcarriers is suppressed. (C2) Description of Second Modified Example of Third Embodiment of the Present Invention This modified example is a case where TDD is used as a duplex system. FIG. 35 is a configuration diagram of a multicarrier direct sequence transmission / reception system 40d according to a second modification of the third embodiment of the present invention. The multi-carrier direct-sequence transceiver 51b and the multi-carrier direct-sequence transceiver 91b shown in FIG. 35 are respectively the same as the multi-carrier transceiver 50d (see FIG. 32), and include an antenna 19e and a dummy bit insertion unit. 85, the serial / parallel converter 10, the transmitting unit 33a, the coupler 32, the receiving unit 34a, the measuring units 73a to 73c, and the second selecting unit 7.
6, a parallel-serial converter 75, and an extraction unit (dummy bit deletion) 74a. Those having the same reference numerals as those described above have the same or similar functions. In these, the transmission part and the reception part are symmetrical.

With such a configuration, TDD transmission / reception is performed in the duplex system, and peak power can be suppressed. As a result, the circuit can be configured symmetrically, so that a feedback circuit required for FDD is not required, and the circuit can be reduced in size. Further, since the duplex system is TDD, the frequency use efficiency is improved.

In this way, high-quality and high-speed data transmission is possible under frequency-selective fading, and subcarriers are adaptively selected during communication, so that efficient frequency use is achieved. This makes it possible to improve the use efficiency of the amplifier. (D) Description of Fourth Embodiment of the Present Invention In the present embodiment, the spreading factor on the transmitting side is changed based on the quality measurement result on the receiving side. Here, the spreading factor is a ratio defined by (total band / information transmission speed).

FIG. 36 is a configuration diagram of a multicarrier direct spread transmission / reception system according to the fourth embodiment of the present invention. The multi-carrier direct-sequence transmission / reception system 40e shown in FIG. 36 is a mobile radio communication system using the CDMA system, and includes a multi-carrier direct-sequence transceiver 50g,
It has a multi-carrier direct spread transceiver 90g. Note that components having the same reference numerals as those described above have the same or similar functions, and further description will be omitted.

The multi-carrier direct-sequence transceiver 50g shown in FIG. 36 transmits a radio signal using m subcarriers by code-multiplexing data to be transmitted. Unit 30a, receiving unit 30b, variable serial / parallel converter 10a,
The control signal output section 16 is provided. Note that m represents a natural number of 2 or more.

Here, the control signal output unit 16 changes the spreading factor for each subcarrier based on the quality measurement result of m subcarriers in the multicarrier direct spreading transceiver 90g, and maintains the total transmission speed while maintaining the total transmission speed. A low spreading factor can be set for subcarriers with good measurement results, and a high spreading factor can be set for subcarriers with poor measurement results. Also,
The transmission unit 30a is connected to the control signal output unit 16, inserts a pilot signal into data to be transmitted, code-multiplexes the data with a spreading factor set by the hierarchical orthogonal code, and transmits a radio signal. .

Therefore, the multi-carrier direct-sequence transmitter (the multi-carrier direct-sequence transmitter / receiver 50g) includes the control signal output part 16 and the transmission part. The multi-carrier direct-sequence transceiver 90g shown in FIG. 36 is arranged to face the multi-carrier direct-sequence transceiver 50g and receives a code-multiplexed radio signal transmitted using m subcarriers. The antennas 19c and 19d and the receiving unit 31a
Measuring units 73a to 73c, a variable parallel-serial converter 75a, a spreading factor determining unit 76a, and a transmitting unit 31b
It is configured with and.

Here, receiving section 31a receives data from m subcarriers and a pilot signal included in m subcarriers, and has measuring sections 73a-73.
c are each connected to the receiving unit 31a, measure the quality of the m subcarriers using the pilot signal, and output the measurement results. The spreading factor determining unit 76a
Are connected to the measuring units 73a to 73c, and determine the spreading factor of each subcarrier based on the measurement result in order to transmit the spreading factor information to the multicarrier direct spreading transceiver 50g.

Therefore, the multi-carrier direct-spreading receiver (multi-carrier direct-spreading transceiver 90g) includes a receiving section 31a, measuring sections 73a to 73c, and a spreading factor determining section 76.
That is, it is configured with a. Further, FIG.
In the multi-carrier direct spread transmission / reception system 40e shown in FIG.
c, 19d, the receiving unit 30b, and the control signal output unit 16 cooperate to form a feedback loop 100c.

FIG. 37 is a block diagram of a multi-carrier direct spread transceiver 50g according to the fourth embodiment of the present invention. In the multiplier 14a shown in FIG. 37, a hierarchical orthogonal code is multiplied. The unit 14b is adapted to be multiplied by the long code. FIG. 38 is a block diagram of an opposing multicarrier direct spread transceiver 90g according to the fourth embodiment of the present invention. Further, those having the same reference numerals as those described above have the same or similar functions, and further description will be omitted.

With such a configuration, transmission / reception using feedback is performed. FIG. 39 is a flowchart of the transmission / reception method according to the fourth embodiment of the present invention. First, quality measurement is performed for m subcarriers (step E1), the spreading factor of m subcarriers is determined (step E2), and information (data) is transmitted / received (step E3). ).

As described above, while the total transmission speed is maintained, the spreading factor can be set according to the measurement result, and efficient transmission and reception can be performed. Also, in this way, under frequency selective fading, high quality and high speed data transmission becomes possible, and since subcarriers are adaptively selected during communication, efficient frequency utilization becomes possible, The use efficiency of the amplifier can be improved.

(D1) Description of First Modification of Fourth Embodiment of the Present Invention In the multicarrier direct spreading transmission / reception system 40e of the fourth embodiment, the spreading factor can be changed. FIG.
(A) is an operation explanatory diagram of the multi-carrier direct spreading transceiver 150 having the same spreading factor for each subcarrier, and
FIG. 40B is an explanatory diagram of the operation of the multi-carrier direct spreading transceiver 50g when the spreading factor is changed for each subcarrier. In FIG. 40A, 20 Mb from the left side
Serial data having a speed of ps is input, converted into 1: 4 parallel data by a serial / parallel converter 10, and then a subcarrier having a transmission speed of 5 Mbps is transmitted.

In FIG. 40B, data having a speed of 20 Mbps is input from the left side, and the variable serial / parallel converter 10a outputs, for example, 2.5 Mbps.
Subcarriers having transmission rates of bps, 2.5 Mbps, 5 Mbps, and 10 Mbps are transmitted.
It should be noted that the value of the transmission rate can be changed in various ways, such as 0 Mbps, 5 Mbps, 5 Mbps, and 10 Mbps.
It is also possible to set it to s.

Thus, the control signal output unit 16 (see FIG. 37) of the multicarrier direct spreading transceiver 50g changes the spreading factor for each subcarrier based on the quality measurement result of the m subcarriers on the receiving side. While maintaining the total transmission speed, the subcarriers with good measurement results have a low spreading factor,
Set a high spreading factor for subcarriers with poor measurement results,
In a transmitting unit 30a connected to the control signal output unit 16, a pilot signal is inserted into data to be transmitted,
Code multiplexing is performed at the spreading factor set by the hierarchical orthogonal code, and the radio signal is transmitted.

On the other hand, the multi-carrier direct spread transceiver 9
In the 0g receiving unit 31a, a radio signal transmitted by using the m subcarriers by code multiplexing by the multicarrier direct spread transceiver 50g is received, transmission data is detected, and a pilot signal is extracted. Further, the measuring units 73a to 73c connected to the receiving unit 31a
The quality of each subcarrier is measured using the pilot signal, and the measurement result is output. The spreading factor determining unit 76a connected to the receiving unit 31a transmits the spreading factor information to the multicarrier direct spreading transceiver 50g. Therefore, the spreading factor of each subcarrier is determined based on the measurement result.

With this configuration, transmission and reception are performed, and the same effects as those described above can be obtained. (E) Others The present invention is not limited to the above-described embodiment and its modified example, and can be variously modified and implemented without departing from the gist of the present invention.

The multi-carrier direct-spreading transmitter and the multi-carrier direct-spreading receiver of the present invention
It can be used for base stations or mobile terminals. For example,
In FIG. 2, a multi-carrier direct spread transceiver 50
Can be configured as a mobile terminal. In this case, a plurality of adders 15 are not required, and can be configured without multiplexing signals from other users.

Further, in the case of FDD, other means can be used to return the quality measurement result from the receiving side to the transmitting side. Further, the modulator 1 of the first embodiment
The modulation method of 2a to 12c is not limited to QPSK modulation,
Other modulation schemes can be used.

[0167]

As described above in detail, according to the multi-carrier direct spreading transmission / reception system of the present invention, multi-carrier direct spreading for code-multiplexing data to be transmitted and transmitting a radio signal using a plurality of subcarriers. A transmitter and a multi-carrier direct-spread receiver that is arranged opposite to the multi-carrier direct-spread transmitter and receives a code-multiplexed radio signal transmitted using a plurality of subcarriers; A direct spreading transmitter is connected to the first selection unit for selecting n subcarriers having good quality measurement results from the m subcarriers, and inserts a pilot signal into data to be transmitted. The radio signal is transmitted using each of the n selected subcarriers, and the (mn) unselected subcarriers are transmitted. A multi-carrier direct-sequence receiver, which includes a transmitter for transmitting an pilot signal, receives m sub-carriers transmitted by the multi-carrier direct-sequence transmitter, detects transmission data, and periodically transmits pilot signals. A receiving unit that extracts a signal, is connected to the receiving unit, and is connected to the receiving unit; and an extracting unit that extracts data that is divided and inserted into each of n subcarriers.
A measurement unit that performs quality measurement on each of the m subcarriers using the pilot signal and outputs a measurement result, and is connected to the measurement unit, and among the m subcarriers,
Since it is configured with a second selection unit that selects n subcarriers on which data is transmitted based on received data and periodically transmits a measurement result to a transmission side, frequency selective fading is performed. Even below, there is an advantage that high-quality and high-speed data transmission is possible (claim 1).

According to the multi-carrier direct-sequence transceiver of the present invention, the multi-carrier direct-sequence transmitter includes a multi-carrier direct-sequence transmitter and a multi-carrier direct-sequence receiver. , With a transmitter,
Since the multi-carrier direct-spreading receiver is configured to include the receiving unit, the extracting unit, the measuring unit, and the second selecting unit, the circuit configuration can be made symmetric and the size can be reduced.
There is an advantage that the frequency use efficiency is improved (claim 4).

Furthermore, according to the multi-carrier direct spreading transmitter of the present invention, since it is configured to include the first selecting section and the transmitting section, the difference between the peak transmission power and the average transmission power is reduced. There is an advantage that the use efficiency of the amplifier can be improved (claim 5). In addition, according to the multi-carrier direct spreading receiver of the present invention, since it is configured to include the receiving unit, the extracting unit, the measuring unit, and the second selecting unit, the quality measuring result is fed back and transmitted. There is an advantage that the side can dynamically select subcarriers and perform high-quality data transmission (claim 6).

The transmitting section of the multi-carrier direct spreading transmitter is configured so that the selection information is inserted into the control information area, and the extracting section of the multi-carrier direct spreading receiver includes It may be configured to select n subcarriers on the basis of this, and in this case, there is an advantage that high-quality and high-speed data transmission is possible under frequency selective fading as well. , 3).

Further, according to the multi-carrier direct-sequence transmission / reception system of the present invention, the multi-carrier direct-sequence transmitter includes a multi-carrier direct-sequence transmitter and a multi-carrier direct-sequence receiver. Since the multi-carrier direct-sequence receiver includes a receiving unit, a measuring unit, a control command generating unit, a combining command generating unit, and a transmission power control unit, There is an advantage that the use efficiency of the amplifier can be improved (claim 7).

According to the multi-carrier direct-sequence transceiver of the present invention,
Having a multi-carrier direct-spread receiver, the multi-carrier direct-spread transmitter includes a transmitter, a controller, and an adder, the multi-carrier direct-spread receiver includes a receiver,
A measuring unit, a control command generating unit, a combined command generating unit, and when the number of coincidences between the control command and the combined command exceeds a threshold value, all k subcarriers are matched with the combined command. In other cases, a control command that causes no increase or decrease is generated for a subcarrier that matches the combined command, and a subcarrier that does not match the combined command is matched with the combined command, thereby determining the k subcarriers. Since it is configured with a transmission power control command unit for transmitting a control command to the multi-carrier direct spread transmitter by increasing / decreasing operation by inverting, the influence of frequency selective fading is reduced, and there is time variation. Unnecessary increase in transmission power can be avoided even on multipath propagation paths, and appropriate power is Reception can power efficiency is advantageous to improve (claim 12).

Further, according to the multi-carrier direct spreading transmitter of the present invention, since the multi-carrier direct-sequence transmitter includes the transmitting unit, the control unit, and the adding unit, the sub-carriers that do not satisfy the quality standard are transferred to different frequencies. Therefore, there is an advantage that the power efficiency of the transmission-side amplifier is improved (claim 13). And according to the multi-carrier direct spread receiver of the present invention,
Since the receiving unit, the measuring unit, the control command generating unit, the combining command generating unit, and the transmission power control command unit are configured, the transmission power can be efficiently adjusted (claim 14).

Further, the transmission unit may be configured to encode the data to be transmitted using the orthogonal code after combining, or the transmission power control command unit may compare the number of matches with a threshold value to transmit the transmission power. It is configured to output a control command, configured to match the increase / decrease determination to the number i of consecutive runs, or the transmitting side assigns different spreading codes to subcarriers based on a subcarrier change command from the receiving side. Alternatively, the receiving side may be configured to transmit a frequency change command to the transmitting side. In this case, the user identification can be reliably performed, and the number of orthogonal codes that can be allocated increases. In addition, there is an advantage that the number of subscribers can be promoted (claims 8 to 11).

According to the multicarrier direct spreading transmission / reception system of the present invention, a multicarrier transmitter and a multicarrier receiver are provided, and the multicarrier transmitter includes a suppression bit insertion unit and a transmission unit. A multi-carrier receiver comprising a receiving unit, a measuring unit, an extracting unit,
Since it is configured with the selection unit, it is possible to communicate in a frequency band that is not affected by fading, there is an advantage that the ratio between the average power and the peak power is reduced, and the transmission amplifier can be used efficiently. 15).

Further, the measuring section may be configured to measure the quality of subcarriers by displaying the received signal strength, or may be configured to select n subcarriers based on the measured measurement result. In this case, the transmission power can be efficiently adjusted. According to the multi-carrier transceiver of the present invention, the multi-carrier transmitter includes a multi-carrier transmitter, a multi-carrier receiver, and the multi-carrier transmitter includes a suppression bit insertion unit and a transmitter. Is configured to include a receiving unit, a measuring unit, an extracting unit, and a second selecting unit,
There is an advantage that the transmission power can be efficiently controlled without depending on the system specifications.

Further, according to the multicarrier transmitter of the present invention, the multicarrier transmitter includes a suppression bit insertion unit and a transmission unit, and the transmission unit inserts a time-multiplexed pilot signal into data to be transmitted. Since it may be configured to perform code multiplexing, the peak power of m subcarriers can be suppressed (claims 17 and 18). And
ADVANTAGE OF THE INVENTION According to the multicarrier receiver of this invention, since it is comprised including the receiving part, the measurement part, the extraction part, and the 2nd selection part, there exists an advantage which can also adjust power for every subcarrier. (Claim 19).

Further, according to the multicarrier direct spreading transmission / reception system of the present invention, a multicarrier direct spreading transmitter and a multicarrier direct spreading receiver are provided. Since it is provided with a receiving unit, a measuring unit, and a spreading factor determining unit, there is an advantage that the transmission power can be efficiently controlled (claim 20).

Further, the above-mentioned duplex system may be a time division duplex. In this case, since the circuit configuration becomes symmetrical, the frequency conversion circuit becomes unnecessary and the circuit can be miniaturized. There is an advantage that the frequency use efficiency is improved. Furthermore, the above-mentioned duplex system may be a frequency division duplex, and this has the advantage that the transmission power can be efficiently controlled.

According to the multi-carrier direct-sequence transmitter / receiver of the present invention,
Having a multi-carrier direct-spread receiver, a multi-carrier direct-spread transmitter, a controller, and a transmitter, the multi-carrier direct-spread receiver is a receiver, a measuring unit,
Since it is configured with the spreading factor determining unit, the spreading factor can be set based on the measurement result while the total transmission speed is maintained, and there is an advantage that efficient transmission and reception can be performed.
1).

In addition, according to the multi-carrier direct-sequence transmitter of the present invention, it comprises a control unit and a transmission unit. According to the multi-carrier direct-sequence receiver of the present invention, Since it is configured to include a unit, a measuring unit, and a spreading factor determining unit, there is an advantage that high-quality and high-speed data transmission can be performed under frequency selective fading as well. ).

The above-mentioned radio transmission / reception may be performed under frequency selective fading, which has an advantage that high-quality and high-speed data transmission is possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a multicarrier direct spread transmission / reception system according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a multicarrier direct spread transceiver according to the first embodiment of the present invention.

FIG. 3 is a layout diagram of a transmission spectrum according to the first embodiment of the present invention.

FIG. 4 is a block diagram of a multicarrier direct spread transceiver according to the first embodiment of the present invention.

FIG. 5 is a flowchart of a transmission / reception method according to the first embodiment of the present invention.

FIG. 6 is a block diagram of a multicarrier direct sequence transceiver according to a first modification of the first embodiment of the present invention.

FIG. 7 is a block diagram of a facing multi-carrier direct spread transceiver according to a first modification of the first embodiment of the present invention.

FIG. 8A is a diagram showing an example of a data format according to a first modification of the first embodiment of the present invention, and FIG.
FIG. 7 is an explanatory diagram of quality measurement according to a first modification of the first embodiment of the present invention.

FIG. 9 is a configuration diagram of a multicarrier direct spread transmission / reception system according to a second modification of the first embodiment of the present invention.

FIG. 10 is a configuration diagram of a multicarrier direct spread transmission / reception system according to a second embodiment of the present invention.

FIGS. 11A and 11B are explanatory diagrams of a four-wave system.

FIGS. 12A and 12B are explanatory diagrams of a quarter-wave system, respectively.

FIG. 13 is a block diagram of a multicarrier direct spread transceiver according to a second embodiment of the present invention.

FIG. 14 is a layout diagram of a transmission spectrum according to a second embodiment of the present invention.

FIG. 15 is a block diagram of a facing multicarrier direct spreading transceiver according to a second embodiment of the present invention.

FIG. 16 is an explanatory diagram of a fading level according to the second embodiment of the present invention.

FIGS. 17A and 17B are explanatory diagrams of transmission power control in flat fading, respectively. FIGS.
(D) is an explanatory diagram of transmission power control in selective fading, and (e) is an explanatory diagram of an increase / decrease method according to the second embodiment of the present invention.

FIG. 18 is a flowchart of a transmission / reception method according to the second embodiment of the present invention.

FIG. 19 is a block diagram of a multicarrier direct sequence transceiver according to a first modification of the second embodiment of the present invention.

FIGS. 20A and 20B are layout diagrams of a transmission spectrum according to a first modification of the second embodiment of the present invention, respectively.

FIG. 21 is a block diagram of a facing multicarrier direct spread transceiver according to a first modification of the second embodiment of the present invention.

FIG. 22 is a flowchart of a transmission / reception method according to a first modification of the second embodiment of the present invention.

FIG. 23 is a block diagram of a multicarrier direct sequence transceiver according to a second modification of the second embodiment of the present invention.

FIG. 24 is a block diagram of a facing multicarrier direct spread transceiver according to a second modification of the second embodiment of the present invention.

FIG. 25 is a layout diagram of a transmission spectrum according to a second modification of the second embodiment of the present invention.

FIG. 26 is a configuration diagram of a multicarrier direct sequence transmission / reception system according to a third modification of the second embodiment of the present invention.

FIG. 27 is a configuration diagram of a multicarrier transmission / reception system according to a third embodiment of the present invention.

FIG. 28 is a block diagram of a multicarrier transceiver according to a third embodiment of the present invention.

FIG. 29 is a layout diagram of a transmission spectrum according to the third embodiment of the present invention.

FIG. 30 is a block diagram of a facing multicarrier transceiver according to a third embodiment of the present invention.

FIG. 31 is a flowchart of a transmission / reception method according to a third embodiment of the present invention.

FIG. 32 is a block diagram of a multicarrier transceiver according to a first modification of the third embodiment of the present invention.

FIG. 33 is a layout diagram of a transmission spectrum according to a first modification of the third embodiment of the present invention.

FIG. 34 is a block diagram of a multicarrier transceiver according to a first modification of the third embodiment of the present invention.

FIG. 35 is a configuration diagram of a multicarrier direct spread transmission / reception system according to a second modification of the third embodiment of the present invention.

FIG. 36 is a configuration diagram of a multicarrier direct spread transmission / reception system according to a fourth embodiment of the present invention.

FIG. 37 is a block diagram of a multicarrier direct spread transceiver according to a fourth embodiment of the present invention.

FIG. 38 is a block diagram of an opposing multicarrier direct spreading transceiver according to a fourth embodiment of the present invention.

FIG. 39 is a flowchart of a transmission / reception method according to a fourth embodiment of the present invention.

FIG. 40 (a) is an explanatory diagram of an operation of a multicarrier direct spreading transceiver in which a spreading factor is the same for each subcarrier,
(B) is an explanatory diagram of the operation of the multicarrier direct spreading transceiver when the spreading factor is changed for each subcarrier.

FIG. 41 (a) is a schematic diagram of a spectrum arrangement using a single carrier, and FIG. 41 (b) is a schematic diagram of a spectrum arrangement using a multicarrier.

[Explanation of symbols]

Reference Signs List 10 serial / parallel converter 10a variable serial / parallel converter 11 first selecting unit 12a to 12c modulator 13a to 13c, 13d to 13f pilot signal inserting unit 14a, 14b, 14c multiplier 15, 19a adder 17a to 17c, 67a to 67c Filters 18a to 18c Power increase / decrease section 19b Amplifier 19c, 19d, 19e Antenna 16, 16a Control signal output section 20 Pilot signal extraction section 20a Control information extraction section 21 Synchronous detection section 22 Inverse DFT section 23, 75 Parallel-serial converter 30a, 30c, 30d, 31b, 30e, 33, 33
a Transmitters 30b, 31a, 31c, 31d, 34, 34a Receivers 40, 40a, 40b, 40c, 40d, 40e, 40
f Multi-carrier direct spread transmission / reception system 50, 50a, 50b, 50c, 50e, 50f, 50
g, 150, 51 Multi-carrier direct spreading transmitter 50d, 52, 90d, 92 Multi-carrier transceiver 68a-68c, 69a-69c, 70a-70c, 6
8d-68f, 69d-69f, 70d-70f, 68
g, 69g, 70g Correlation detectors 72a to 72c Rake combiners 72d to 72f Rake receivers 73a to 73c, 80 Measuring units 74, 74a Extracting units 75a Variable parallel-serial converters 76 Second selecting units 76a Spreading factor determining units 79a Maximum Ratio combining section 79b Signal determining section 80a to 80c SIR measuring section 80d SIR measuring section after combining 81, 81a to 81c TPC command generating section 82a Synthetic TPC command generating section 82b Transmission power control command generating section 82d Threshold value comparison / frequency change command Generation unit 83 DFT unit 84 MRC unit 85 Dummy bit insertion unit 87 Delay element 90, 90a, 90b, 90c, 90d, 90e, 90
f, 90g, 91 Multi-carrier direct spreading receiver 100, 100a, 100b, 100c Feedback loop

 ────────────────────────────────────────────────── ─── Continuing from the front page (54) [Title of the Invention] Multi-carrier direct spread transmission / reception system, multi-carrier direct spread transmitter / receiver, multi-carrier direct spread transmitter and multi-carrier direct spread receiver, multi-carrier transmission / reception system, multi-carrier Carrier transceiver, multicarrier transmitter and multicarrier receiver

Claims (23)

[Claims] 1. A multi-carrier direct-spread transmitter for code-multiplexing data to be transmitted and transmitting a radio signal using a plurality of sub-carriers;
A multi-carrier direct-sequence receiver that receives a code-multiplexed radio signal transmitted using a plurality of subcarriers, wherein the multi-carrier direct-sequence transmitter has m (m is a natural number of 2 or more) And a first selection unit for selecting n (n is a natural number equal to or less than m) subcarriers having a good quality measurement result from the subcarriers of the first selection unit. A pilot signal is inserted into data, code-multiplexed, a radio signal is transmitted using each of the n selected subcarriers, and a pilot signal is transmitted on the (mn) unselected subcarriers. A transmitting unit for transmitting, the multi-carrier direct spreading receiver receives the m sub-carriers transmitted by the multi-carrier direct spreading transmitter, detects transmission data, and A receiving unit that extracts a pilot signal to be transmitted in a serial manner, an extracting unit that is connected to the receiving unit, and extracts data that is divided and inserted into each of the n subcarriers, and that is connected to the receiving unit. A measurement unit that performs quality measurement on each of the m subcarriers using the pilot signal and outputs a measurement result, and is connected to the measurement unit, and among the m subcarriers,
A second selection unit that selects the n subcarriers on which data is transmitted based on received data and periodically transmits the measurement result to a transmission side. , Multi-carrier direct spread transmission and reception system. 2. The transmission unit of the multi-carrier direct spreading transmitter is configured to insert selection information relating to a subcarrier number on which transmission data is superimposed into an area of control information relating to a transmission rate in the transmission data. 2. The multicarrier direct spreading transmission / reception according to claim 1, wherein the extraction unit of the multicarrier direct spreading receiver is configured to select the n subcarriers based on the control information. system. 3. The multi-carrier direct spreading transmitter, wherein the transmitting unit of the multi-carrier direct spreading transmitter is configured to insert selection information relating to a subcarrier number on which transmission data is superimposed into a transmission data area. 2. The multi-carrier direct spreading transmission / reception system according to claim 1, wherein the extraction unit of the receiver is configured to select the n sub-carriers based on the transmission data. 4. A multi-carrier direct-spreading transmitter for code-multiplexing data to be transmitted and transmitting a radio signal using a plurality of subcarriers, and an opposing multi-carrier direct-spread transmitter arranged opposite to each other is code-multiplexed. And a multi-carrier direct-spreading receiver for receiving a radio signal transmitted using a plurality of sub-carriers, wherein the multi-carrier direct-spreading transmitter comprises m (m is a natural number of 2 or more) sub-carriers. A first selector for selecting n (n is a natural number not more than m) subcarriers having good quality measurement results from the carriers, and a pilot signal connected to the first selector for transmitting data to be transmitted. Is inserted and code-multiplexed, a radio signal is transmitted using each of the selected n subcarriers, and a pilot signal is transmitted using (mn) unselected subcarriers. A transmission unit for transmitting a signal; the multicarrier direct-spreading receiver receives a radio signal transmitted by using the m subcarriers after being code-multiplexed by the opposed multicarrier direct-spreading transmitter and transmitting the transmission data; A receiving unit that detects the pilot signal and extracts a periodically transmitted pilot signal; and an extracting unit that is connected to the receiving unit and extracts data that is divided and inserted into each of the n subcarriers. A measuring unit connected to the receiving unit for measuring the quality of each of the m subcarriers using the pilot signal and outputting a measurement result; and the m subcarriers connected to the measuring unit. From among
A second selection unit that selects the n subcarriers on which data is transmitted based on received data and periodically transmits the measurement result to a transmission side. , Multi-carrier direct spread transceiver. 5. A method for selecting n (n represents a natural number less than m) subcarriers from m (m represents a natural number greater than 2) subcarriers based on a quality measurement result on the receiving side. A selection unit, which is connected to the first selection unit, inserts a pilot signal into data to be transmitted, code-multiplexes, transmits a radio signal using each of the selected n subcarriers, and A multi-carrier direct-sequence transmitter, comprising: a transmitter that transmits a pilot signal using (m−n) subcarriers that have not been transmitted. 6. A code-multiplexed radio signal transmitted using m (m is a natural number of 2 or more) subcarriers is received, transmission data is detected, and a pilot signal transmitted periodically is received. A receiving unit for extracting a signal, connected to the receiving unit, and n (n represents a natural number equal to or less than m)
An extraction unit for extracting data inserted by being divided into each of the subcarriers, and measuring and measuring the quality of each of the m subcarriers using the pilot signal. A measuring unit for outputting a result, connected to the measuring unit, and among the m subcarriers,
A second selection unit that selects the n subcarriers on which data is transmitted based on received data and periodically transmits the measurement result to a transmission side. , Multi-carrier direct spread receiver. 7. A multi-carrier direct-sequence transmitter for code-multiplexing data to be transmitted and transmitting a radio signal using a plurality of sub-carriers;
A multi-carrier direct-sequence receiver that receives a code-multiplexed radio signal transmitted using a plurality of subcarriers, wherein the multi-carrier direct-sequence transmitter inserts a pilot signal into the data to be transmitted The same data is inserted into each of k (k is a natural number of n or less) subcarriers separated by a predetermined frequency from n (n is a natural number of 2 or more) subcarriers. A transmission unit that transmits and transmits the data, a control unit that is connected to the transmission unit and controls the increase and decrease of transmission power according to a transmission power command, and adds a pilot signal composed of a known signal to transmission data with the k subcarriers. The multi-carrier direct-sequence receiver receives the radio signal transmitted using the k sub-carriers transmitted by the multi-carrier direct-sequence transmitter. A receiving unit that outputs a signal resulting from the radio signal, and is connected to the receiving unit, measures quality of each of the k subcarriers, outputs an individual measurement result, and outputs the k A measuring unit that measures the quality of the combined carrier obtained by combining the subcarriers and outputs a combined measurement result; and a transmission power level of each of the k subcarriers connected to the measuring unit and based on the individual measurement result. A control command generator for outputting a control command indicating increase, decrease, or maintenance; and a control command for increasing, decreasing, or maintaining the combined carrier based on the combined measurement result, as a combined command. A combination command generator to be output, the control command generator and the combination command generator, wherein the control command and the combination command are Transmission power control for comparing the determined number of matches with a predetermined threshold value to determine whether to increase, decrease or maintain the transmission power for each of the k subcarriers, and to output the determination as a transmission power control command A multi-carrier direct spreading transmission / reception system, comprising: 8. The transmission power control command section outputs a transmission power control command for matching all transmission powers of the k subcarriers with the combined command when the number of matches exceeds the threshold value. If the number of coincidences does not exceed the threshold value, a transmission power control command for not increasing / decreasing a subcarrier having transmission power that matches the combined command is output, and a transmission not matching the combined command is output. 8. The multi-carrier direct spreading transmission / reception system according to claim 7, wherein a transmission power control command for causing a sub-carrier having power to have a transmission power matching the combining command is output. 9. The transmission power control command unit determines whether the number of control commands and the number of combined commands increase or decrease by the number i of consecutive runs of increase or decrease.
8. An apparatus according to claim 7, wherein an upper limit is set for the number of increase / decrease in accordance with (i represents a natural number of 2 or more), and the number is increased / decreased by a power of 2 (i-1). Multi-carrier direct spread transmission and reception system. 10. The multi-carrier direct-sequence transmitter according to claim 1, wherein the control unit transfers the data-transmitting sub-carrier to a different sub-carrier based on a sub-carrier frequency changing command transmitted by the receiving side. The multi-carrier direct-spreading transmission / reception system according to claim 7, characterized in that different spreading codes are assigned to. 11. The multi-carrier direct-sequence receiver is connected to the measuring unit, compares the measurement result with a predetermined quality reference value, and transmits the same data among the k sub-carriers transmitting the same data. The subcarriers that do not satisfy a predetermined quality criterion value are provided with a threshold value comparison / frequency change command generation unit that requests a frequency change for the multicarrier direct spread transmitter. Item 8. A multicarrier direct spread transmission / reception system according to Item 7. 12. A multi-carrier direct-spreading transmitter for code-multiplexing data to be transmitted and transmitting a radio signal using a plurality of subcarriers, and an opposing multi-carrier direct-spread transmitter arranged opposite to each other is code-multiplexed. And a multi-carrier direct-sequence transmission unit for receiving a radio signal transmitted using a plurality of subcarriers, wherein the multi-carrier direct-sequence transmission unit inserts a pilot signal into the data to be transmitted and code-multiplexes it. , N (where n represents a natural number of 2 or more) subcarriers, and the same data is inserted and transmitted into each of k (k represents a natural number of n or less) subcarriers separated by a predetermined frequency. A control unit connected to the transmission unit and capable of controlling an increase or a decrease in transmission power according to a transmission power command; The multi-carrier direct-spreading receiver receives a radio signal that is code-multiplexed by the opposed multi-carrier direct-spreading transmitter and transmitted using the k sub-carriers. A receiving unit that outputs a signal resulting from the radio signal; connected to the receiving unit, measures quality of each of the k subcarriers, outputs an individual measurement result, and outputs the k subcarriers. A measuring unit for measuring the quality of the combined carrier obtained by combining the two and outputting the combined measurement result; and increasing the transmission power level of each of the k subcarriers based on the individual measurement result. A control command generator for outputting a control command indicating decrease or maintenance, and a control command generator connected to the measuring unit, for increasing the combined carrier based on the combined measurement result. A combined command generator that outputs a control command representing addition, reduction, or maintenance as a combined command; and a control command generator and the combined command generator that are connected to each other to determine the number of matches between the control command and the combined command. If the threshold value is exceeded, all of the k subcarriers are made to match the combined command. Otherwise, the control command is issued to make no change in the subcarriers that match the combined command. The sub-carriers that do not match the combining command are matched with the combining command, thereby increasing or decreasing the number of the sub-carriers by inverting the determination on the k sub-carriers. And a transmission power control command unit for transmitting the multicarrier. Remote transceiver. 13. A pilot signal is inserted into data to be transmitted, code-multiplexed, and k (k is a predetermined frequency away from k (k is a natural number of 2 or more) subcarriers.
A transmission unit that inserts the same data into each of the subcarriers and transmits the same data, and a control unit that is connected to the transmission unit and that can control increase or decrease of transmission power according to a transmission power command. A multi-carrier direct-sequence transmitter, characterized by comprising an adding section for adding a pilot signal composed of a known signal to transmission data with k subcarriers. 14. A receiving unit that receives a code-multiplexed radio signal transmitted using k (k is a natural number of 2 or more) subcarriers and outputs a signal resulting from the radio signal, Connected to the receiving unit, measuring the quality of each of the k subcarriers, outputting an individual measurement result, and measuring the quality of the combined carrier obtained by combining the k subcarriers to perform the combined measurement. A measuring unit for outputting a result, and a control command generator connected to the measuring unit for outputting a control command indicating increase, decrease or maintenance for each of the transmission power levels of the k subcarriers based on the individual measurement result. And a combining command which is connected to the measuring unit and outputs a control command indicating increase, decrease or maintenance for the combined carrier based on the combined measurement result as a combined command. And the control command generator and the combined command generator are connected to the control command generator and the combined command generator, and perform transmission power control on transmission data for each of the k subcarriers using the monitor signal so as to transmit the transmission power control to the transmission side. And a transmission power control command unit for performing independent power control for each subcarrier and transmitting the control command to the transmission side using the quality measurement result and the combined quality measurement result. Features a multi-carrier direct spread receiver. 15. A multi-carrier transmitter for transmitting a radio signal by using m (m is a natural number of 2 or more) subcarriers for data to be transmitted, and disposed to face the multi-carrier transmitter. And a multi-carrier receiver for receiving a radio signal transmitted using the m sub-carriers, wherein the multi-carrier transmitter includes n (n is a natural number of m or less) sub-carriers. A suppression bit insertion unit that inserts dummy bits into the (m−n) subcarriers to suppress peak power of the m subcarriers based on the quality information related to the m subcarriers; A transmission unit for transmitting a radio signal using each of the n selected subcarriers for transmitting data to be transmitted, wherein the multicarrier receiver transmits using the m subcarriers; A receiving unit that receives the received radio signal, detects transmission data, and extracts a pilot signal; and is connected to the receiving unit and uses the pilot signal to
A measuring unit that measures the quality of the subcarriers and outputs a measurement result; connected to the measuring unit, selects the n subcarriers from the m subcarriers based on the measurement result, An extraction unit that removes and outputs dummy bits; a second selection unit that is connected to the measurement unit and that transmits quality information on the selected n subcarriers to the transmission side using the n subcarriers; A multi-carrier transmission / reception system characterized by comprising: 16. Data to be transmitted is code-multiplexed and m
A multi-carrier transmitting unit for transmitting a radio signal using this (m represents a natural number of 2 or more) sub-carriers, and an opposing multi-carrier transmitter arranged oppositely transmitted using m sub-carriers A multi-carrier receiving unit for receiving a radio signal, wherein the multi-carrier transmitting unit is configured to transmit the peak power of the m sub-carriers based on quality information on the n (n is a natural number of m or less) sub-carriers. And a suppression bit insertion unit that inserts dummy bits into the (m−n) subcarriers, and is connected to the suppression bit insertion unit and converts the data to be transmitted into the selected n subcarriers. A transmission unit for transmitting a radio signal using each of the carriers, wherein the multicarrier reception unit receives the radio signal transmitted using the m subcarriers and detects transmission data. And a receiving unit that extracts a pilot signal; and a pilot signal that is connected to the receiving unit and included in the m subcarriers transmitted by the opposed multicarrier transmitter. A measuring unit that measures quality and outputs a measurement result, and is connected to the measurement unit, selects the n subcarriers from the m subcarriers based on the measurement result, and deletes the dummy bits. And a second selecting unit connected to the measuring unit and transmitting the quality information on the selected n subcarriers to the transmitting side by the n subcarriers. A multicarrier transceiver, characterized in that it is configured. 17. In order to transmit data to be transmitted using m (m is a natural number of 2 or more) subcarriers,
Suppression of inserting dummy bits into (mn) subcarriers in order to suppress the peak power of the m subcarriers based on the quality information on the n (n is a natural number less than or equal to m) subcarriers A bit insertion unit, and a transmission unit connected to the suppression bit insertion unit and configured to transmit the data to be transmitted and transmit a radio signal using each of the selected n subcarriers. A multi-carrier transmitter, characterized in that: 18. The multi-carrier transmission according to claim 17, wherein the transmission unit is configured to insert and temporally multiplex a pilot signal temporally multiplexed into the data to be transmitted. Machine. 19. A receiving section for receiving a radio signal transmitted using m (m is a natural number of 2 or more) subcarriers, detecting transmission data, and extracting a pilot signal, and a receiving section. And using the pilot signal,
A measuring unit that measures the quality of the subcarriers and outputs a measurement result; and n (n represents a natural number equal to or less than m) from the m subcarriers based on the measurement result. And an extractor for selecting and outputting the dummy bits inserted by the transmitting side and outputting the quality information on the selected n subcarriers connected to the measuring unit. And a second selection unit for transmitting to the transmission side according to (1). 20. Code-multiplexing data to be transmitted and m
A multi-carrier direct-sequence transmitter for transmitting a radio signal using this (m represents a natural number of 2 or more) sub-carriers;
A multi-carrier direct-sequence receiver that receives a radio signal that is code-multiplexed and transmitted using the m sub-carriers, wherein the multi-carrier direct-sequence transmitter includes: While maintaining the total transmission rate by changing the spreading factor for each subcarrier based on the quality measurement results of the m subcarriers, the spreading factor is low for subcarriers with good measurement results and high for subcarriers with poor measurement results. A control unit capable of setting a spreading factor, connected to the control unit, inserting a pilot signal into the data to be transmitted, code-multiplexing with the spreading factor set by the hierarchical orthogonal code, and transmitting a radio signal The multi-carrier direct-spreading receiver is code-multiplexed by the multi-carrier direct-spreading transmitter.
A receiving unit that receives a radio signal transmitted using the subcarriers, detects transmission data, and extracts a pilot signal; and is connected to the receiving unit, and measures the quality of each subcarrier using the pilot signal. And a measuring unit that outputs the measurement result, and is connected to the measuring unit, and determines the spreading factor of each subcarrier based on the measurement result so as to transmit the spreading factor information to the multicarrier direct spreading transmitter. A multicarrier direct spreading transmission / reception system, comprising a spreading factor determining unit. 21. Code-multiplexing data to be transmitted and m
A multi-carrier direct-spreading transmitter for transmitting a radio signal using this (m is a natural number of 2 or more) sub-carriers, and an opposing multi-carrier direct-spreading transmitter arranged code-multiplexing the m A multi-carrier direct-spreading receiver that receives a radio signal transmitted using the number of sub-carriers, wherein the multi-carrier direct-spreading transmitter has a quality of the m sub-carriers in the multi-carrier direct-spreading receiver. A control unit capable of changing the spreading factor for each subcarrier based on the measurement result and setting a low spreading factor for subcarriers having good measurement results and a high spreading factor for subcarriers having poor measurement results while maintaining the total transmission rate. And a pilot signal inserted into the data to be transmitted, code-multiplexed at the spreading factor set by the hierarchical orthogonal code, and A transmission unit for transmitting a line signal, wherein the multi-carrier direct-sequence receiving unit receives and transmits a radio signal which is code-multiplexed by the opposed multi-carrier direct-sequence transmitter and transmitted using the m sub-carriers. A receiving unit for detecting data and extracting a pilot signal; a measuring unit connected to the receiving unit, measuring the quality of each subcarrier using the pilot signal and outputting a measurement result; And a spreading factor determining unit for determining the spreading factor of each subcarrier based on the measurement result so as to transmit the spreading factor information to the multicarrier direct spreading transmitter. A multi-carrier direct spread transceiver. 22. Based on the quality measurement result on the receiving side, the spreading result is changed for each of m (m is a natural number of 2 or more) subcarriers, and the measurement result is good while maintaining the total transmission speed. With a low spreading factor for subcarriers,
A control unit capable of setting a high spreading factor for subcarriers with poor measurement results, a pilot signal inserted into the data to be transmitted, code-multiplexed with hierarchical orthogonal codes, and quality measurement results for each of the m subcarriers , The spreading factor of each of the m subcarriers is changed, and while maintaining the total transmission rate, a low spreading factor is used for subcarriers having good measurement results, and a high spreading factor is used for subcarriers having poor measurement results. And a transmitter for transmitting a wireless signal. 23. A receiving section for receiving a radio signal which is code-multiplexed and transmitted using m (m is a natural number of 2 or more) subcarriers, detects transmission data, and extracts a pilot signal. A measuring unit connected to the receiving unit for measuring the quality of each subcarrier using the pilot signal and outputting a measurement result; and connected to the measuring unit, and spreading the spreading factor information on the multicarrier direct spread. A multi-carrier direct spreading receiver, characterized by comprising a spreading factor determining unit for determining the spreading factor of each subcarrier based on the measurement result to transmit to a transmitter.