JP2002280946A - Receiver for master station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a receiver for a master station, that avoids the arrival of a desired signal and a disturbing signal almost at the same time, employs adaptive array diversity reception for receiving signals with sufficient isolation and enhance the availabity of frequency. SOLUTION: The receiver includes a quasi section detector 25 that outputs base band signals of in-phase and quadrature components, a plurality of complex multiplier sections 100 that output weighted complex base band signals, a complex adder section 15 that sums and combines the complex base band signals, a discrimination section 16 that outputs demodulation data from a compositing base band signal, a known signal generating section 40 that generates a reference signal, a complex discrimination error detection section 19 that outputs an error signal, a weight calculation section 30 that calculates a weight of a complex number, and a mean delay quantity detection circuit 45 that uses a reference transmission reception timing managed by the master station and demodulation data, outputted from the discrimination section 16, to detect a means real propagation delay of the desired signal sent from a slave station.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving device of a master station which is used for receiving a digitally modulated radio frequency signal sent from a slave station and receives the signal by a plurality of antennas.

[0002]

2. Description of the Related Art In recent years, in the field of mobile communication, digitization of wireless communication has been progressing from the viewpoints of improving confidentiality, compatibility with ISDN networks and computers, and effective use of frequency resources. In order to use frequency resources effectively,
It is desirable to reuse radio waves of the same frequency (channel) at a repetition distance as short as possible. However, shortening the repetition distance of frequency increases interference (co-channel interference) from a nearby mobile station (slave station) or base station (master station) using the same channel, resulting in lower transmission quality. There is a problem to do.

[0003] By the way, fading occurs in mobile communication, so that transmission quality (error rate in digital communication) deteriorates remarkably. For this reason, transmission quality degradation due to fading is compensated for by spatial diversity reception, which is usually received by two or more antennas and a receiving circuit (branch). As a diversity branch combining method, a post-detection selective combining in which an output of a branch having the highest received signal strength (hereinafter, referred to as “RSSI”) is a received output is the most common. Furthermore, a post-detection maximum ratio combining method is known as a combining method for improving reception characteristics. In general, when the maximum ratio combining is performed, a combined baseband signal is obtained by weighting and adding the baseband signal obtained by the demodulation circuit for each branch with the same weight for each of two orthogonal and in-phase components.

[0004] It is known that the diversity reception improves not only the fading but also the transmission quality degradation against the above-mentioned co-channel interference. There is array diversity reception. By performing such adaptive array diversity reception, co-channel interference is reduced and frequency use efficiency can be increased.

FIG. 8 is a block diagram showing a conventional master station receiving apparatus using adaptive array diversity reception.

In FIG. 8, 1 is an antenna, and 2 is a receiving circuit for converting a received signal obtained by the antenna 1 for each branch into a complex baseband signal in which in-phase and quadrature components correspond to real and imaginary parts, respectively. It is. Receiving circuit 2
Comprises a high-frequency circuit 21, a band-pass filter 22, an automatic gain control (AGC) amplifier 23, and a quasi-synchronous detector 25. As in the case of a general digital modulation signal receiver, the band-pass filter 22 has a narrow band as far as possible without intersymbol interference. Reference numeral 30 denotes a weight calculator for calculating a complex weight of each branch, and 100 denotes a weight calculator 30 for a complex baseband signal xk (k = 1, 2,..., K) obtained from the receiving circuit 2 for each branch. Complex weight wk (k = 1, 2,...,
k), a complex multiplication unit for weighting by multiplying the complex baseband signal weighted by the complex multiplication unit 100 of each branch; A determination unit that determines the transmitted data by comparing it with an appropriate threshold value and outputs the data as demodulated data. Reference numeral 40 stores a reference signal d which is an ideal complex baseband signal corresponding to known data (known signal) called a pilot symbol or a training signal periodically inserted into a part of transmission data. The known signal generating section to be generated, 19 is a determination section 16
And a reference signal d obtained from the known signal generator 40 or the complex baseband signal synthesized by the complex adder 15. Although the configuration of signal processing in the master station has been described above, these processings are usually realized by a digital circuit or a digital signal processor (DSP) in which the signal processing is programmed.

Next, the operation of the receiver of the master station shown in FIG. 8 will be described.

As shown in FIG. 1, each of the above-mentioned receiving systems receives signals by two or more antennas 1 and a receiving circuit (branch) 2 and obtains a quadrature / in-phase signal obtained for each branch, similarly to spatial diversity by maximum ratio combining. Are synthesized by weighting and adding the baseband signals with different weights. That is, the complex baseband signals x1, x2,... Are weighted by complex weights w1, w2,. The weights w1, w2,... Are reduced by the weight calculator 30 so that the error e between the reference signal d (or demodulated data) and the combined signal is reduced, and the signals x1, x2,. It is updated adaptively and sequentially using the error e. As the weight update algorithm,
L which is the same processing as the linear equalizer using the tapped delay line
The MS and RLS algorithms are used, and are specifically shown in, for example, a document (Yoichi Saito, "Modulation and Demodulation Techniques for Digital Radio" edited by the Institute of Electronics, Information and Communication Engineers). Among these algorithms,

[0009]

(Equation 1) The LMS algorithm in which the weight is updated by is often used because its operation is the simplest. Where n
Is the time in units of the number of symbols from the beginning of the pilot symbol (training signal), and μ is the step size. For example, in International Patent Publication W097 / 20400,
A diversity receiver in which the LMS is applied to spread spectrum communication is disclosed.

[0010]

However, in the above-mentioned conventional receiving apparatus, when there is an interference signal containing the same known signal as the desired signal, and the desired signal and the interference signal arrive at almost the same time, It was difficult to distinguish between the signal and the interfering signal, and it was difficult to receive the signals with sufficient separation.

In the receiving device of the master station, it is possible to prevent the desired signal and the interfering signal from arriving at substantially the same time even if there is an interfering signal containing the same known signal as the desired signal. Has been requested.

According to the present invention, in order to satisfy this requirement, it is possible to prevent the desired signal and the interference signal from arriving at substantially the same time even if there is an interference signal containing the same known signal as the desired signal. It is an object of the present invention to provide a receiving device of a master station which can sufficiently separate the signals by using adaptive array diversity reception and receive each signal to improve the frequency use efficiency.

[0013]

In order to solve the above problem, a master station receiving apparatus of the present invention is a master station receiving apparatus that communicates with a slave station, comprising a plurality of antennas, A quasi-synchronous detector that inputs a high-frequency signal as a received signal or an intermediate frequency signal obtained by frequency-converting a high-frequency signal, performs quadrature detection on the high-frequency signal or the intermediate frequency signal, and outputs in-phase and quadrature-component baseband signals. And a plurality of complex multipliers that output a weighted complex baseband signal by multiplying the baseband signal by a complex weight, using the in-phase and quadrature components of the baseband signal as real and imaginary parts of a complex number, respectively. A complex adder for adding and combining a plurality of weighted complex baseband signals output from the complex multiplier, and an addition and synthesis performed by the complex adder. A determination unit that outputs a transmission symbol as demodulated data from a synthesized baseband signal; a known signal generation unit that generates, as a reference signal, the same signal as a known signal included in the received signal; a reference signal or demodulated data and a synthesized baseband A complex determination error detection unit that outputs an error signal from the signal, a weight calculation unit that calculates a complex weight from the error signal and the baseband signal, and a reference transmission / reception timing and determination unit managed by a master station serving as a master And an average delay amount detection circuit for detecting an average actual propagation delay amount of a desired signal transmitted from a slave station serving as a slave using the demodulated data output from the slave station.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A receiving device of a master station according to a first aspect of the present invention is a receiving device of a master station that communicates with a slave station. A quasi-synchronous detector that inputs a high-frequency signal as a received signal or an intermediate frequency signal obtained by frequency-converting the high-frequency signal, performs quadrature detection on the high-frequency signal or the intermediate frequency signal, and outputs in-phase and quadrature-component baseband signals; A plurality of complex multipliers that output a weighted complex baseband signal by multiplying the baseband signal by a complex weight, using the in-phase and quadrature components of the band signal as a real part and an imaginary part of a complex number, respectively, and a plurality of complex multipliers Complex addition unit for adding and combining a plurality of weighted complex baseband signals output from the unit, and a combined baseband obtained by adding and combining by the complex addition unit A determination unit that outputs a transmission symbol from the signal as demodulated data, a known signal generation unit that generates the same signal as a known signal included in the received signal as a reference signal, and a reference signal or demodulated data and a combined baseband signal. A complex determination error detector that outputs an error signal, a weight calculator that calculates a complex weight from the error signal and the baseband signal, and a reference transmission / reception timing and a determination unit that are managed by a master station serving as a master. And an average delay amount detection circuit for detecting an average actual propagation delay amount of a desired signal transmitted from a slave station serving as a slave using the demodulated data.

With this configuration, the slave station is notified of the delay information calculated so that the desired signal arrives from the slave station to the master station with the average desired delay amount based on the average actual propagation delay amount, and the slave station transmits the delay information. Since the desired signal can be transmitted on the basis, the master station can receive the desired signal with an average desired delay amount,
Even if there is a desired signal and an interfering signal including the same known signal, it is possible to prevent the desired signal and the interfering signal from arriving at the receiving device at the same time, and use adaptive array diversity reception for each signal. Can be sufficiently separated and received.

According to a second aspect of the present invention, the master station receiving apparatus is used only between a specific slave station transmitting a desired signal and the master station. A timing change unit for changing the reference transmission / reception timing portion based on the average actual propagation delay amount is provided.

With this configuration, even when a desired signal and an interfering signal including the same known signal are present, it is possible to prevent the desired signal and the interfering signal from arriving at the same time at the receiver. Each signal can be received with sufficient separation by using diversity reception, and a specific slave station can transmit and receive according to the reference transmission and reception timing as usual.

A receiving device of a master station according to a third aspect of the present invention is the receiving device of the master station according to the first aspect, wherein the memory stores not only the average actual propagation delay but also the average received power as a table. Slots are sequentially allocated to each slave station while an empty slot exists, but if a desired signal sent from a plurality of slave stations equal to or more than the number of slots allocated to the master station is to be received, the next slot is allocated. The average received power of the desired signal transmitted from the next slave station to be transmitted is compared with the table, and the stored average received power is transmitted at the average received power closest to the average received power of the desired signal. A slave station allocating unit for allocating the next slave station to the same slot as the slot to which the slave station is allocated.

With this configuration, since the weight update algorithm for adaptive array diversity reception can be converged at high speed, there is an effect that each signal can be separated and received at high speed.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIGS.

(Embodiment 1) FIG. 1 is a block diagram showing a receiving device of a master station according to Embodiment 1 of the present invention, and FIG. 2 is a diagram showing a general communication state between a master station and slave stations. FIG.

In FIG. 1, an antenna 1, a receiving circuit 2,
Complex addition unit 15, determination unit 16, complex determination error detection unit 1
9, the high-frequency circuit 21, the band-pass filter 22, the automatic gain control amplifier 23, the quasi-synchronous detector 25, the weight calculator 30, the known signal generator 40, and the complex multiplier 100 are the same as those in FIG. And the description is omitted.
Reference numeral 45 denotes an average delay amount detection circuit using the reference transmission / reception timing. In FIG. 2, M is a master station, and S4 is a fourth slave station (first to third slave stations S1 to S3 will be described later).

The operation of the receiving device of the master station configured as described above will be described with reference to FIGS. 3 is a first schematic diagram of a slot configuration at the time of reception in the receiving device, FIG. 4 is a second schematic diagram of a slot configuration at the time of reception at the receiving device, and FIGS. 5 and 6 are slot configurations of the receiving device at the time of reception. FIG. 7 is a table diagram showing a channel assignment table.

First, a signal is received by the antenna 1, and the received signal is passed through a high-frequency circuit 21, a band-pass filter 22, an automatic gain control (AGC) amplifier 23, and a quasi-synchronous detector 25. A complex baseband signal is obtained in which the orthogonal components correspond to the real part and the imaginary part, respectively. For each branch, a complex baseband signal xk (k = 1, 2,..., K) obtained from the receiving circuit 2 is weighted by a complex weight unit wk by a complex weight wk from the weight calculation unit 30. . Complex multiplier 1 for each branch
The complex baseband signals weighted by 00 are combined by the complex adder 15 and output as a combined complex baseband signal. The determination unit 16 determines the transmitted data by comparing the combined complex baseband signal from the complex addition unit 15 with an appropriate threshold, and outputs the determination result as demodulated data. The known signal generator 40 stores known data (known signal) called a pilot symbol periodically inserted into a part of the transmission data, and generates it as a reference signal d. The complex determination error detection unit 19 calculates the difference between the demodulated data determined by the determination unit 16 or the reference signal d output from the known signal generation unit 40 and the composite complex baseband signal from the complex addition unit 15 as an error signal e. Output as The weight calculator 30 calculates the complex weight of each branch by a general weight update algorithm such as (Equation 1). The average delay amount detection circuit 45 calculates the average actual propagation delay amount of the desired signal using the reference transmission / reception timing and the demodulated data from the determination unit 16.

FIG. 3 shows an operation example. In FIG. 3, the transmission / reception 3 slots configuration, a master station (for example, a base station) manages a reference transmission / reception timing (superframe) as a master, a slave station (for example, a mobile station) is a slave, and all available slots are used. When the next child station is the fourth
It is assumed that the slave station S4 is assigned to slot 2.
As shown in FIG. 3, the first to third slave stations S1 to S3 are allocated to slots 1 to 3. The average actual propagation delay amount d4 of the slave station S4 measured by the average delay amount detection circuit 45 is equal to or ± the average actual propagation delay amount d2 of the second slave station S2.
If there is only a shift of about 0.5 symbol, the delay information dt used in the slave station S4 is calculated by the master station M and notified to the slave station S4. The slave station S4 determines the transmission timing based on the delay information dt. Here, dt = dd−d4 (dd is the average desired delay amount, d4 is the average actual propagation delay amount of the slave station S4). Thereby, a desired signal including the same known signal and an interference signal (the desired signal of the slave station S2 is an interference signal for the slave station S4, and the desired signal of the slave station S4 is an interference signal for the slave station S2). Exists, the delay information dt
Therefore, since the desired signal and the interference signal do not arrive at the same time, the signals can be sufficiently separated and received using the adaptive array diversity reception, and the frequency use efficiency can be improved.

Also, without informing the slave station of the delay information,
The reference transmission / reception timing portion used only between the specific slave station S4 transmitting the desired signal and the master station M is represented by delay information d.
By referring to t, even if the desired signal and the interfering signal including the same known signal exist, the desired signal and the interfering signal do not arrive at the same time, so that the adaptive array diversity reception is performed. It can also be used to sufficiently separate and receive each signal. FIG. 4 shows an operation example. In FIG. 4, an environment similar to that in FIG. 3 is assumed. In the operation example of FIG. 4, the delay information is not notified to the slave station S4.
Only the reference transmission / reception timing of slot 2 with respect to slot 4 is changed. As a result, the transmission timing from the master station M, which is the master, to the slave station S4, which is the slave, is set to the delay information dt.
And the target slave station S4 may transmit a signal to the master station M using the reference transmission / reception timing as usual. Here, dt = dd−d4 (dd is the average desired delay amount, d4 is the average actual propagation delay amount of the slave station S4). The change of the reference transmission / reception timing portion with reference to the delay information dt is performed by, for example, a timing change unit (not shown).
Do with.

Further, in the average delay amount detection circuit 45, not only the average actual propagation delay amount of the arriving desired signal but also the average reception power can be stored in a memory (not shown) as a table so that an empty slot becomes available. Slots are sequentially allocated to each slave station while it exists, but if a desired signal transmitted from a plurality of slave stations equal to or more than the number of slots allocated to the master station is to be received, the next slot is to be allocated. The average received power of the desired signal transmitted from the slave station (next slave station) is compared with the table, and the same slot as the slot assigned to the slave station transmitting with the closest average received power is assigned to the next slave station. , The weight update algorithm can converge at high speed, and each incoming signal can be separated at high speed, so that the characteristics can be improved. 5 and 6 show operation examples. FIG.
In FIG. 6, the same environment as in FIGS. 3 and 4 is assumed. In the operation examples of FIG. 5 and FIG. 6, when assigning the slave station S4,
By comparing the average received power of the desired signal transmitted from the slave station S4 with the table in FIG. 7, the slave station S4 is also assigned to the slot 2 to which the slave station S2 having the closest average received power is assigned. Here, assuming that dt is the delay information for changing the transmission timing to the slave station S4 as in the case of FIGS. 3 and 4, dt = dd−d4 (where dd is the average desired delay amount and d4 is the slave station). S4). By performing such control, the performance of the adaptive array diversity reception characteristic can be further improved. The assignment of the slot 2 to the slave station S4 is performed by, for example, a slave station assignment unit (not shown).

As described above, according to the present embodiment, a plurality of antennas 1 and a high-frequency signal as a reception signal received by the antenna 1 or an intermediate frequency signal obtained by frequency-converting the high-frequency signal are input, and the high-frequency signal or A quasi-synchronous detector 25 that performs quadrature detection on the intermediate frequency signal and outputs in-phase and quadrature-component baseband signals, and a complex number And a complex adder 15 that outputs a complex baseband signal weighted by multiplying the weights by a weight and a complex adder 15 that adds and synthesizes a plurality of weighted complex baseband signals output from the complex multipliers 100 And a transmission symbol from the combined baseband signal obtained by adding and combining by the complex adding unit 15 as demodulated data. A determination unit 16 for generating the same signal as the known signal included in the received signal as a reference signal d, and outputting an error signal between the reference signal or demodulated data and the combined baseband signal. And a weight calculator 30 for calculating a complex weight from the error signal and the baseband signal.
Using the reference transmission / reception timing managed by the master station M serving as the master and the demodulated data output from the determination section 16, the average actual propagation delay amount of the desired signal transmitted from the slave station S4 serving as the slave Delay detection circuit 45 for detecting
The delay information calculated such that the desired signal arrives from the slave station S4 to the master station M with the average desired delay amount based on the average actual propagation delay amount is notified to the slave station S4.
4, the desired signal can be transmitted based on the delay information, so that the master station M can receive the desired signal with the average desired delay amount, and the desired signal and the interference signal containing the same known signal exist. However, it is possible to prevent the desired signal and the interfering signal from arriving at the receiving device at the same time, and it is possible to sufficiently separate and receive each signal using the adaptive array diversity reception, thereby improving the frequency use efficiency. Can be enhanced.

[0029] Further, a timing change unit for changing a reference transmission / reception timing portion used only between a specific slave station transmitting a desired signal and a master station based on the average actual propagation delay amount is provided. Even if there is a desired signal and an interfering signal including the same known signal, the desired signal and the interfering signal can be prevented from arriving at the receiver at the same time. Can be sufficiently separated and received, and the specific slave station S4 only needs to transmit and receive according to the reference transmission and reception timing as usual, and the configuration of the specific slave station S4 can be simplified.

A memory for storing not only the average actual propagation delay amount but also the average received power as a table;
Slots are sequentially allocated to each slave station while an empty slot exists, but if a desired signal sent from a plurality of slave stations equal to or more than the number of slots allocated to the master station is to be received, the next slot is allocated. The average received power of the desired signal transmitted from the next slave station to be transmitted is compared with the table, and the stored average received power is transmitted at the average received power closest to the average received power of the desired signal. By providing a slave station allocating unit that allocates the next slave station to the same slot as the slave station is allocated, the weight update algorithm for adaptive array diversity reception can converge at high speed. Can be received.

[0031]

As described above, according to the receiving device of the master station according to the first aspect of the present invention, the receiving device of the master station that communicates with the slave station is provided. A quasi-synchronization that inputs a high-frequency signal as a reception signal received by an antenna or an intermediate-frequency signal obtained by frequency-converting a high-frequency signal, performs quadrature detection on the high-frequency signal or the intermediate-frequency signal, and outputs a baseband signal of in-phase and quadrature components. A detector, and a plurality of complex multipliers that output a weighted complex baseband signal by multiplying the baseband signal by a complex weight, using the in-phase and quadrature components of the baseband signal as real and imaginary parts of a complex number, respectively. A complex adder for adding and combining a plurality of weighted complex baseband signals output from the plurality of complex multipliers, A determination unit that outputs a transmission symbol as demodulated data from a combined baseband signal; a known signal generation unit that generates, as a reference signal, the same signal as a known signal included in the received signal; a reference signal or demodulated data and a combined baseband A complex determination error detection unit that outputs an error signal from the signal, a weight calculation unit that calculates a complex weight from the error signal and the baseband signal, and a reference transmission / reception timing and determination unit managed by a master station serving as a master And an average delay amount detection circuit for detecting an average actual propagation delay amount of a desired signal transmitted from a slave station serving as a slave using the demodulated data output from the slave station. The slave station is notified of the delay information calculated so that the desired signal arrives from the slave station to the master station with the average desired delay amount, and the slave station uses the delay information as a basis. Since the desired signal can be transmitted, the master station can receive the desired signal with an average desired delay amount. Even if the desired signal and the interfering signal including the same known signal exist, the desired signal and the interfering signal can be transmitted at the same time. Can be prevented from arriving at the receiving device,
Each signal can be sufficiently separated and received using the adaptive array diversity reception, and the advantageous effect that the frequency use efficiency can be improved can be obtained.

According to the receiving device of the master station described in claim 2, the receiving device of the master station described in claim 1 is used only between a specific slave station transmitting a desired signal and the master station. By providing a timing change unit that changes the reference transmission / reception timing part based on the average actual propagation delay amount, even if a desired signal and an interfering signal including the same known signal exist, the desired signal and the Since interference signals can be prevented from arriving at the receiver, each signal can be received with sufficient separation using adaptive array diversity reception, and a specific slave station can follow a standard transmission / reception timing as usual. The transmission and reception may be performed, and an advantageous effect that the configuration of a specific slave station can be simplified can be obtained.

[0033] According to the receiver of the master station described in claim 3, in the receiver of the master station described in claim 1, a memory for storing not only the average actual propagation delay amount but also the average received power as a table. While the available slots exist, slots are sequentially assigned to each slave station, but if a desired signal sent from a plurality of slave stations equal to or more than the number of slots assigned to the master station is to be received, The table compares the average received power of the desired signal sent from the next slave station to be allocated to the table with the average received power of the desired signal among the stored average received powers. A mobile station allocating section for allocating the next mobile station to the same slot as the mobile station to which the mobile station is allocated, whereby the weight update algorithm for adaptive array diversity reception is provided. There since it converges fast, advantageous effect that the signal can be received and separated into a high speed can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a receiving device of a master station according to Embodiment 1 of the present invention.

FIG. 2 is an explanatory diagram showing a general communication state between a master station and a slave station.

FIG. 3 shows a first example of a slot configuration at the time of reception in a receiving apparatus.
Schematic diagram of

FIG. 4 shows a second example of the slot configuration at the time of reception in the receiving apparatus.
Schematic diagram of

FIG. 5 shows a third example of the slot configuration at the time of reception in the receiving apparatus.
Schematic diagram of

FIG. 6 shows a third example of the slot configuration at the time of reception in the receiving apparatus.
Schematic diagram of

FIG. 7 is a table diagram showing a channel assignment table;

FIG. 8 is a block diagram showing a conventional master station receiver using adaptive array diversity reception.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antenna 2 reception circuit 15 complex addition unit 16 determination unit 19 complex determination error detection unit 21 high-frequency circuit 22 band-pass filter 23 automatic gain control amplifier (AGC amplifier) 25 quasi-synchronous detector 30 weight calculation unit 40 known signal generation unit 45 average Delay amount detection circuit 100 Complex multiplication unit

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (3)

[Claims] 1. A receiving device of a master station for communicating with a slave station, comprising: a plurality of antennas; a high-frequency signal as a reception signal received by the antenna; or an intermediate frequency obtained by frequency-converting the high-frequency signal. A quasi-synchronous detector for inputting a signal, quadrature detecting the high-frequency signal or the intermediate frequency signal, and outputting a baseband signal of in-phase and quadrature components, and a real part of a complex number for the in-phase and quadrature components of the baseband signal, respectively. And a plurality of complex multipliers that output a weighted complex baseband signal by multiplying the baseband signal by a complex weight as an imaginary part, and a plurality of weighted complex bases output from the plurality of complex multipliers. A complex adder for adding and combining band signals; and a transmission symbol from a combined baseband signal obtained by adding and combining by the complex adder. A determination unit that outputs a signal as demodulated data, a known signal generation unit that generates the same signal as a known signal included in the received signal as a reference signal, and the reference signal or the demodulated data and the combined baseband signal. A complex determination error detection unit that outputs an error signal, a weight calculation unit that calculates the weight of the complex number from the error signal and the baseband signal, a reference transmission / reception timing managed by a master station serving as a master, and An average delay amount detection circuit for detecting an average actual propagation delay amount of a desired signal transmitted from a slave station serving as a slave using the demodulated data output from the determination unit. Receiver. 2. A timing change section for changing a reference transmission / reception timing portion used only between a specific slave station transmitting a desired signal and a master station based on the average actual propagation delay amount. The receiving device of a master station according to claim 1, wherein: 3. A memory for storing not only the average actual propagation delay amount but also an average received power as a table, and slots are sequentially allocated to each slave station while an empty slot exists. When trying to receive desired signals transmitted from a plurality of slave stations having the number of slots equal to or greater than the number of slots, the average received power of the desired signal transmitted from the next slave station to be allocated next is compared with the above table. A slave station that assigns the next slave station to the same slot as a slot to which a slave station transmitting with an average reception power closest to the average reception power of the desired signal among the accumulated average reception powers is assigned. The receiving device of a master station according to claim 1, further comprising an allocating unit.