JP2002359587A - Adaptive receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adaptive receiver, whose path diversity receiving effects are high from a satisfactorily operating frame synchronizing circuit under an environment, in which identical channel interference waves exist or is under a multi-path propagating environment. SOLUTION: Reception signals from antennas 511 -51K are down-converted into reception base band signals by base band signal generators 521 -52K. An adaptive control processor 59 outputs weighting coefficients to be used for a beam forming means B1 and a frame timing, corresponding to high precision L pieces of estimated arriving waves from the reception base band signals and L pieces of beam forming means B1 output signals in each sampling time Ts. A delay-correcting means B2 synchronizes the L pieces of beam forming means B1 output signals, by using the frame timing corresponding to the highly precise L pieces of estimated arriving waves. An W wave multiplexer 58 selects, multiplexes, and outputs M pieces of signals whose power is high from the L pieces of delay correcting means B2 output signals, based on the reception power of the L pieces of estimated arriving waves inputted from a correlator 54.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention realizes path diversity reception in a digital radio communication system using an array antenna composed of a plurality of antenna elements in a propagation environment where co-channel interference waves exist or in a multipath propagation environment. The present invention relates to an improved adaptive receiver.

[0002]

2. Description of the Related Art In digital communication in an environment where an interference wave exists, an adaptive array antenna suppresses the interference wave by forming a directional null in the direction of the interference wave. Further, as shown in FIG. 6, by using a conventional array antenna receiver including K antenna elements, a received signal is separated into a preceding wave signal and a plurality of delayed wave signals, and then a delay time difference is corrected. Thus, the path diversity reception for receiving a desired wave by effectively using the power of each delayed wave is realized.

FIG. 6 is a block diagram of a conventional adaptive receiver using an adaptive array antenna. In the figure, 31 _{1 to} 31 _K are antenna elements constituting an array antenna, 32 _{1 to} 32 _K are baseband signal generators,
3 is a reference signal memory, 34 is a correlator, and 35 _{11 to} 32
_LK is a _multiplier, 36 1 ~ 36 _{L adder,} 37 1-37
₆ is a delay compensator, and 38 is an M-wave synthesizer. The transmission signal is digitally modulated by a digital signal at the transmitting station, and after the preamble signal used for detecting the frame synchronization timing of the time width Tpre, as shown in FIG.
It is assumed that a frame configuration is followed by a data signal having a time width Td. First, baseband signal generators 32 _{1 to} 32 _K are provided for received signals from the _K antenna elements 31 _{1 to} 31 _K , respectively, and the received signals in the RF frequency band are frequency-converted to the base band. Receive baseband signal x
₁ (t) to x _k (t) are generated. Next, the received baseband signals x from the respective baseband signal generators 32 _{1 to} 32 _K
Vectors W ₁ (W _{11 to} W _1K ) to W _L (W _{L1 to} W ₁ ) of different L weighting coefficients from the adaptive control processor 39 are output from multipliers 35 _{11 to} 35 _LK from ₁ (t) to x _k (t).
_LK ), add weights by adders 56 _{1 to} 56 _L , and add a total of L incoming wave signals y ₁ (t) to y _k (t including a preceding wave signal and N−1 delayed wave signals. ) Is estimated and output. Specifically, the incoming wave signal y ₁ (t) is estimated by the following equation.

[0004]

(Equation 1)

On the other hand, the frame synchronization timing of each of the L incoming wave signals is calculated based on the preamble signal 21 stored in the reference signal memory 33 and the received baseband signal. That is, the correlator 34 calculates a correlation value between the preamble signal and the received baseband signal in the frame signal section Tf (Tpre + Td), and determines a timing at which L peaks are detected from the larger of the absolute value squared. The frame synchronization timings P ₁ to P of each of the L incoming wave signals
P _L.

[0006] Each of the L incoming wave signals obtained by the correlator 34
Frame synchronization timing t₁~ T _LEach received signal
The delay compensator 37 corrects the delay time of the signal.₁~ 37_LIn line
And the correlator 34 detects the timing of each incoming signal.
Reception of each arriving wave signal from the peak height of the correlation value used for
Power P of communication signal₁~ P_LIs estimated by the M-wave synthesizer 38.
Of the received signals whose delays have been corrected,
Select M signals and combine them to output the incoming wave signal
You.

FIG. 7 shows the configuration of the adaptive control processor 39 in the conventional adaptive receiver shown in FIG. 7, the complex subtractor ₄₂ 1 through 42 _L references arriving wave signal of the L which is above the estimated _{y 1} and (t) ~y _k (t) signal memory 4
3 output error signals e ₁ (t) to e _k (t), which are the differences between the preamble signals 21 held in 3. Weight calculation circuit 4
In 1, using the received baseband signals _{x 1 (t) ~x k (} t) and the error signal _{e 1 (t) ~e k (} t), the error signal _{e 1} (t) to e
_k vectors W ₁ to _W-L weighting coefficient as mean square becomes small _(t) calculated by any algorithm, and outputs.

[0008]

In the configuration of the conventional adaptive receiver shown in FIG. 6, the frame synchronization timing of the L arriving wave signals from the one with the larger power under the multipath propagation environment is detected as described above. By doing so, M signals are synthesized. However, with such a configuration, in a multipath fading environment, the power of each arriving wave signal changes with time, and the M arriving wave signals to be combined also change with time. Therefore, when the detection accuracy of the frame synchronization deteriorates, the M received wave signals to be synthesized also change, and there is a disadvantage that the effect of the path diversity reception cannot be fully utilized. In addition, when co-channel interference waves are present and the power thereof becomes stronger than a desired wave by a certain degree or more, frame synchronization detection accuracy deteriorates, and the effect of path diversity reception cannot be obtained as described above.

An object of the present invention is to detect a highly accurate synchronization timing of each received wave signal even in an environment where the co-channel interference wave is stronger than a desired wave, introduce an adaptive array antenna, and detect the co-channel interference wave. It is an object of the present invention to provide an adaptive receiver which suppresses and realizes path diversity reception of a preceding wave signal and a plurality of delayed wave signals.

[0010]

In order to achieve the above object, an adaptive receiver according to the first aspect of the present invention comprises:
The earliest of the K received signals having a frame configuration including a frame synchronization signal received by an array antenna composed of K (K is an integer of 2 or more) antenna elements arranged in close proximity in a predetermined arrangement shape. A method for extracting the arriving wave signal using a preceding wave signal arriving at the array antenna and N-1 (N is an integer equal to or less than K-1) delayed wave signals arriving with a delay from the preceding wave signal. An adaptive receiver, receiving means for receiving the received signal with the K antenna elements, performing frequency conversion to a baseband and outputting a received baseband signal; By multiplying and synthesizing a plurality of weighting factors respectively corresponding to the L signals including the preceding wave signal and the N-1 delayed wave signals, the preceding wave signal and the N-1 delayed wave signals are multiplied. Beam forming means for extracting and outputting the L signals including the wave signals, and the L signal including the preceding wave signal and the (N-1) delayed wave signals from the reception baseband signal and the output signal of the beam forming means. Adaptive control for multiplying the respective signals by the corresponding weighting coefficients and outputting the same, and outputting the synchronization timing of frames corresponding to the L signals including the preceding wave signal and the N-1 delayed wave signals Means, and the preceding wave signal and the N signal based on the synchronization timing of frames corresponding to the L signals including the N-1 delayed wave signals output from the adaptive control means. Delay correction means for performing delay correction on the L signals including the preceding wave signal and the N-1 delayed wave signals so that the frame synchronization timings of the -1 delayed wave signals coincide with each other; And band signal, the correlation value between the frame synchronizing signals stored in the reference signal memory, a power estimation means for outputting the estimated power of the preceding wave signal and the (N-1) delayed wave signal,
Synthesizing means for synthesizing an output signal of an M (M is equal to or less than N) wave having a large power estimated from the output of the power estimating means among the output signals of the delay correcting means, and outputting the arriving wave signal. The gist is that

In the adaptive receiver according to the first aspect of the present invention, the K received signals received by each of the antenna elements are multiplied by a corresponding weight coefficient, and L signals including the signal and the N-1 delayed wave signals are extracted at predetermined time intervals and output from the beam forming means. Based on the synchronization timing of the frame output from the adaptive control means, the preceding wave signal and the L signals including the N-1 delayed wave signals output from the beam forming means are respectively determined based on the synchronization timing. The delay is corrected so that the frame signal and the L signals including the N-1 delayed wave signals coincide with each other in frame synchronization timing. On the other hand, the reception power of the L arriving wave signals is estimated from the correlation value between the reception signal and the preamble signal, and the preceding wave signal and the (N-1) delay waves whose delay is corrected from the values are estimated. Among the L signals including the signals, M signals having large power are selected, synthesized, and output.

If accurate delay correction is not performed by the delay correcting means, a sufficient path diversity effect cannot be obtained. Therefore, in the present invention, more accurate frame synchronization timing is obtained from the adaptive control means. Thereby, claim 1
The adaptive receiver described above can appropriately combine M out of the preceding wave signal and the N-1 delayed wave signals, and can improve characteristics as compared with the conventional example.

The adaptive receiver according to a second aspect of the present invention is the adaptive receiver according to the first aspect, wherein the adaptive control means is configured to control the antenna based on the sampling time interval of the reception baseband signal. From the received baseband signal for each element and the error signal representing the difference between the output signals of the L beam forming means and the reference signal, the mean square error of the error signal is minimized using an arbitrary algorithm. A weight calculation circuit for determining the weighting coefficient for weighting each antenna element; a mean square error calculator for calculating a mean square error of the error signal; an output of the mean square error calculator and a threshold value From the comparison with the above, the preceding wave signal and the N
And a threshold comparator for outputting the frame synchronization timing of L signals including one delayed wave signal. With such a configuration, the frame synchronization timing of each of the L signals including the preceding wave signal and the N-1 delayed wave signals is the difference between the output of the beam forming means and the preamble signal held. Since the adaptive receiver according to claim 2 is obtained from the error signal, the adaptive receiver according to the second aspect uses a synchronization timing that is more accurate than the conventional synchronization timing of the frame obtained from the correlation value between the received signal and the preamble signal, and passes the signal. Since diversity synthesis is performed, characteristics can be improved.

An adaptive receiver according to a third aspect of the present invention is different from the adaptive receiver according to the first aspect in that L incoming waves including the preceding wave signal and the N-1 delayed wave signals are provided. Only the selection criteria of the M signals to be synthesized among the estimated signals are different,
Other configurations are the same. An adaptive receiver according to claim 3 is:
There is no power estimation means in the adaptive receiver according to the first aspect. Instead, the mean square of the error signal at the time of detecting each frame synchronization timing of the preceding wave signal output from the adaptive control means and the L arriving wave estimation signals including the N-1 delayed wave signals is detected. It is characterized in that M waves having a small error value are selected and synthesized.

As described above, the adaptive receiver according to the third aspect does not require the power estimating means required for the adaptive receiver according to the first and second aspects. Machine can be realized.

According to a fourth aspect of the present invention, in the adaptive control processor, the threshold comparator outputs not only the frame synchronization timing but also the mean square value of the error signal at the same time. It is different from claim 2.

[0017]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the adaptive receiver of the present invention. In the _figure, 51 1 to 51 _K constitute an array antenna with antenna elements. 52 _{1 to} 52
_L is a baseband signal generator, 53 is a reference signal memory,
54 is a correlator, 55 _{11 to} 55 _LK are complex multipliers, 56
_{1 to} 56 _L are complex adders, which constitute beam forming means B1. 57 _{1 to} 57 _L are delay compensators, and delay compensating means B
Constituting No. 2. 58 is an M-wave synthesizer, and 59 is an adaptive control processor.

The functions of the main components of the above embodiment are as follows. (1) Reception baseband signal generators 52 _{1 to} 52 _1
K converts received signals from the plurality of antennas 51 _{1 to} 51 _K into a base band to generate received base band signals x ₁ (t) to x _k (t). (2) The adaptive control processor 59 outputs the output signals x ₁ (t) to x _k (t) of the baseband signal generators 52 _{1 to} 52 _K and the output signals y ₁ (t) to y _L ( t)
Weighting coefficient vector W ₁ to W-corresponding to the L incoming wave signal including said preceding wave signal and the (N-1) delayed wave signal
_L and the frame synchronization timings t _{1 to} t _L are estimated and output. (3) The beam forming means B ₁ converts the output signals x ₁ (t) to x _k (t) of the baseband signal generators 52 _{1 to} 52 _K into a weighting coefficient vector W output from the adaptive control processor 59.
It performed synthesized using ₁ to _W-L, and outputs. (4) The correlator 54 includes the preamble signal 21 held in the reference signal memory 53 and the baseband signal generator 5
Receiving output from the 2 ₁ baseband signal _{x 1} (t) ~x
A correlation value with _k (t) is calculated, and the reception powers of the L arriving wave signals are estimated and output from the L high peak values. (5) delay correction unit B2 by using the frame synchronization timing _t 1 ~t _L of L arriving wave signal _{y 1} outputted from the adaptive control processor 59 (t) ~y _L (t), the beam forming means B1 output signal y _{1 (t)} ~y to L frame synchronization _(t) coincide, performs an appropriate delay processing. (6) The M-wave combiner 58 uses the received powers of the L arriving wave signals estimated by the correlator 54 to select an M-wave having a high power from the output signals of the delay correction means B2 to perform the synthesis. Produce output.

FIG. 2 shows the configuration of the adaptive control processor 59.
It is shown in FIG. In the figure, 61 is a weight calculation circuit, 62₁
~ 62_LIs a complex subtractor, 63 is a reference signal memory, 64₁
~ 64_LIs the mean square error calculator, 65₁~ 65_LIs the threshold
The functions of the main components in the figure are as follows.
It is on the street. (1) The weight calculation circuit 61 includes the baseband signal generator 5
2₁~ 52_KOutput signal x of₁(t) to x_K(t) and the subtractor 62
₁~ 62_LError signal e output from₁(t) -e _L(t)
Original weighting coefficient vector W₁~ W_LIs output. (2) Subtractor 62₁~ 62_LIs the beam forming means B1
Output signal y₁(t) -y_L(t) and stored in the reference signal memory 63
Signal section to be referenced in the preamble signal 21
d (t) and the error signal e₁(t) -e_L(t) and
And output. (3) Mean square error calculator 64₁~ 64_LIs the error
No. e₁(t) -e_LThe mean square of (t) is sequentially calculated and output. (4) Threshold comparator 65₁~ 65_LIs the mean squared error
Calculator 64₁~ 64_LIs compared with a certain threshold,
Mean square error calculator 64₁~ 64_LOutput below threshold
The falling time is determined by the frame synchronization timing of the L incoming signals.
Output as a ring.

Next, the operation of the first embodiment will be described. K
(K is an integer of 2 or more) antenna elements 51 _{1 to} 51 _K
From the baseband signal generators 52 _{1 to} 52 ₁
It is output as is down-converted to baseband at 2 _K received baseband signals _{x 1 (t) ~x K (} t). Adaptive control processor 59 is the output signal x from the baseband signal generator ₅₂ 1 to 52 _K per sampling period Ts
_{1 (t) ~x K (t} ) and the output signal y ₁ the beam forming means B1 which will be described later and _(t) ~y L _(t) as an input, an output signal y ₁ of the beam forming unit B1 _(t) ~ Vectors W ₁ to W _{1 of} weighting coefficients are determined using an arbitrary algorithm so that the mean square of y _L (t) and transmitted preamble signal 21 is minimized.
It estimates the W _L, and outputs to the beam forming unit B1.

The beam forming means B1 has a sampling period T
vector W of weighting coefficients updated and input for each s
₁~ W_LAnd the received baseband signal x₁(t) to x_K(t)
Prime multiplier 55_1i~ 55_Li(1 ≦ i ≦ K),
Complex adder 56₁~ 56_LIn, the result of the multiplication is
At the same time, the synthesized signal y for each sampling period Ts ₁
(t) -y_L(t) is output. The above operation is performed for L independent
Is equivalent to performing a linear combination of
Cancels the interference signal contained in the
Power, and extract L incoming signals.
Can be.

The reference signal memory 63 holds a signal section to be referenced among the preamble signals at the time interval Tpre, and outputs the signal d (t). Subtractors 62 _{1 to} 62 _L
Is an error signal that is a difference between the preamble signal and the beam forming means outputs y ₁ (t) to y _L (t), which are estimated signals of L arriving waves.

[0023]

(Equation 2)

Is output for each time sampling point.

The mean square error calculator ₆₄ 1 to 64 _L subtracter ₆₂ 1 through 62 L number of the error signal _{e 1} from _L (t) to e
Mean square error of _L (t)

[0026]

(Equation 3)

Is calculated. Threshold comparator 65₁~ 65_Lso
Is the mean square error calculator 64₁~ 64 _LOutput of the specified threshold
Value and the mean square of the error signal falls below the threshold.
Timing of L incoming wave frames
And output it. This is the preamble signal
Output signal y of the₁(t) -y_LTiming with (t)
Is equal to the error signal e₁(t) -e_LThe mean square of (t) is
This is because the probability becomes the smallest.

In the delay correcting means B2, the output signals y ₁ (t) to y of the beam forming means B1, which are estimated signals of L incoming waves, are obtained.
The frame synchronization during _L (t) is made to coincide. L
Although the incoming signals arrive at different frame timings, in order to combine the L estimated signals of the incoming signals with an M-wave combiner 58 described later, the frame synchronization of each signal is matched. There is a need. Adaptive control processor 59
Based on the frame synchronization timing t ₁ ~t _L for the L arriving waves estimation signal more input, to synchronize the frame of each of the L suitably delayed estimated signal L or all estimated signal.

In the M-wave synthesizer 58, L of the delay correction means B2
Out of the output signals, the received power P for each of the incoming wave estimation signals input from the correlator 54 is used, and only the M incoming wave estimation signals having large received powers are combined to arrive at the incoming wave signal y (t ) Is output.

FIG. 3 is a block diagram for explaining a second embodiment of the present invention. The second embodiment differs from the first embodiment shown in FIG. 1 in the functions of the M-wave synthesizer 78 and the adaptive control processor 79 in FIG.

The specific configuration of the adaptive control processor 79 is as follows.
As shown in FIG. The basic configuration of the adaptive control processor 79 is
The configuration of the adaptive control processor 59 of the first embodiment is shown.
It is almost the same as FIG.₁~ 85_Lof
Output is different. Threshold comparator 85₁~ 85_LOutput is
The error signal e of each incoming wave estimation signal₁(t) -e _L
L from the timing when the mean square of (t) fell below the threshold
Frame synchronization timing t of incoming wave₁~ T_L,and
The mean square value e of the error signal at that time₁~ E _LOutput
I do.

The M-wave synthesizer 78 includes an adaptive control processor 79
Of the L error values input from the M, and selects and outputs the M arriving wave estimation signals whose error values are output. The above is the difference from the first embodiment, and the other operations are exactly the same.

[0033]

As described above, according to the adaptive receiver according to the present invention, an array antenna is applied for suppressing an interference wave, and an error signal necessary for calculating a weighting coefficient for weighting an incoming wave. No new synchronization circuit is required by using the present invention for the frame timing detection. Further, the detection accuracy of the frame timing obtained from the error signal is high, and it is possible to suppress the reduction of the effect of the path diversity reception due to the conventional synchronization shift.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram for explaining a configuration of an adaptive control processor in the embodiment of FIG.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

FIG. 4 is a block diagram for explaining a configuration of an adaptive control processor in the embodiment of FIG. 3;

FIG. 5 is a diagram for explaining a frame configuration of a transmission signal.

FIG. 6 is a diagram for explaining a conventional adaptive receiver that realizes path diversity.

FIG. 7 is a block diagram for explaining a configuration of the adaptive control processor of FIG. 6;

[Explanation of symbols]

21 preamble signal 22 data signals 31 ₁ to ₃₁ K, 51 ₁ to 51 _K antenna elements 32 ₁ to ₃₂ K, 52 ₁ to 52 _K baseband signal generator 33,43,53,63 reference signal memory 34, 54 correlators 35 _{1 m} to ₃₅ Lm, _{55 1 m} to _{55 Lm} complex multiplier 36 ₁ to ₃₆ L, 56 ₁ to 56 _L complex adder 37 ₁ to ₃₇ L, 57 ₁ to 57 _L delayer 38, 58, 78 M wave combiner 39, 59, 79 Adaptive control processor 41, 61 Weight calculation circuit 42 _{1 to} 42 _L , 62 _{1 to} 62 _L Complex subtractor 64 _{1 to} 64 _L Mean square error calculator 65 _{1 to} 65 _L , 85 _{1 to} 85 _L Threshold comparator B1 Beam forming means B2 Delay correcting means

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroshi Yuan 2-1-15 Ohara, Kamifukuoka-shi, Saitama Inside KDDI Research Institute Inc. (72) Inventor 2-1 Takashi Ishihara, Ohara, Kamifukuoka-shi, Saitama 15 KDDI Research Institute, Inc. (72) Inventor Takeo Ozeki 2-1-15 Ohara, Kamifukuoka-shi, Saitama F-term (Reference) 5K052 AA01 DD04 EE38 FF29 FF31 5K059 AA08 CC04 DD32 DD35

Claims (4)

[Claims] 1. K elements juxtaposed and juxtaposed in a predetermined arrangement shape
From K received signals of a frame configuration including a frame synchronization signal received by an array antenna including K (K is an integer of 2 or more) antenna elements, An adaptive receiver for extracting the arriving wave signal using N-1 (N is an integer equal to or less than K-1) delayed wave signals arriving with a delay from the wave signal, wherein the received signal is Receiving means for receiving by the K antenna elements, converting the frequency to a baseband band and outputting a received baseband signal, for the received baseband signal, By multiplying and combining a plurality of weighting factors corresponding to the L signals including the delayed wave signal,
Beam forming means for extracting and outputting the L signals including the preceding wave signal and the N-1 delayed wave signals; and outputting the leading wave signal from the reception baseband signal and the output signal of the beam forming means. The L signals including the N-1 delayed wave signals are each multiplied by the corresponding weighting coefficient and output, and the preceding wave signal and the N signal are output.
Adaptive control means for outputting a frame synchronization timing corresponding to L signals including -1 delayed wave signals; the preceding wave signal output from the adaptive control means and the N-1 delayed wave signals , Based on the synchronization timings of the frames corresponding to the L signals including the N signals, so that the frame synchronization timings of the preceding wave signal and the N-1 delayed wave signals coincide with each other. Delay correction means for correcting the delay of L signals including one delayed wave signal; and determining the preceding wave from a correlation value between the received baseband signal and the frame synchronization signal held in a reference signal memory. Estimating means for estimating and outputting the power of the signal and the (N-1) delayed wave signals; and M (M is the largest of the power signals estimated from the output of the power estimating means) among the output signals of the delay correcting means. N or less Adaptive receiver, characterized in that by combining the output signal of the wave, with a synthesizing means for outputting the incoming wave signal. 2. The method according to claim 1, wherein the adaptive control unit is configured to determine, at each sampling time interval of the reception baseband signal, a difference between a reception baseband signal for each antenna element, an output signal of the L beam forming units, and a reference signal. And a weight calculation circuit that determines the weighting coefficient for weighting the antenna element so as to minimize the mean square error of the error signal using an arbitrary algorithm from the error signal representing the error signal. A mean square error calculator for calculating a mean square error; and comparing the output of the mean square error calculator with a threshold to calculate L signals including the preceding wave signal and the N-1 delayed wave signals. The adaptive receiver according to claim 1, further comprising a threshold comparator that outputs the frame synchronization timing. 3. A frame structure including K frame synchronization signals received by an array antenna composed of a plurality of K (K is an integer of 2 or more) antenna elements juxtaposed and arranged in a predetermined arrangement shape and close to each other. From the received signal, the preceding wave signal arriving at the array antenna earliest, and N-1 (N is an integer equal to or less than K-1) arriving with a delay from the preceding wave signal
An adaptive receiver for extracting an incoming wave signal using the delayed wave signal of the above, wherein the received signal is received by the K antenna elements, frequency-converted to a baseband, and a received baseband signal is received. And a plurality of weighting factors corresponding to L signals including the preceding wave signal and the N-1 delayed wave signals, with respect to the reception baseband signal output from the reception means. Beam forming means for extracting and outputting L signals including the preceding wave signal and the N-1 delayed wave signals, and combining the received band signal and the output of the beam forming means.
The weighting coefficients respectively corresponding to the L signals including the preceding wave signal and the N-1 delayed wave signals are calculated and output, and the leading wave signal and the N-1 delayed wave signals are calculated. Adaptive control means for outputting a frame synchronization timing corresponding to the L signals including the above, and also outputting a value of the mean square error used for detecting the frame synchronization timing; The frame synchronization timings of the preceding wave signal and the N-1 delayed wave signals match on the basis of the synchronization timings of the frames corresponding to the wave signal and the L signals including the N-1 delayed wave signals. Delay correction means for correcting the delay of the L signals including the preceding wave signal and the N-1 delay wave signals, and the adaptive control means among the output signals of the delay correction means Of the values of L mean square error of force, small value M
(M is equal to or less than N) a combining means for combining output signals of waves and outputting the incoming wave signal. 4. The adaptive control means includes: for each sampling time interval of the reception baseband signal, a difference between a reception baseband signal for each of the antenna elements, an output signal of the L beam forming means, and a reference signal. And a weight calculation circuit that determines the weighting coefficient for weighting the antenna element so as to minimize the mean square error of the error signal using an arbitrary algorithm from the error signal representing the error signal. A mean square error calculator for calculating a mean square error; and comparing the output of the mean square error calculator with a threshold to calculate L signals including the preceding wave signal and the N-1 delayed wave signals. 4. The adaptive receiver according to claim 3, further comprising a threshold value comparator for outputting a value of a root mean square of the frame synchronization timing and the error signal.