JP3423659B2 - Wireless receiver - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver for receiving a multi-carrier signal for signal transmission using a plurality of carriers, and more particularly to a radio receiver for receiving and combining signals using a plurality of antennas. It relates to the device.

[0002]

2. Description of the Related Art Conventionally, in wireless communication, a single carrier transmission method has been widely used in which signals are transmitted using a single frequency. In addition, in order to receive a signal with good quality in a receiver, a signal reception method has been widely used in which signals are received and combined using a plurality of antennas. Among them, the adaptive array using the directional beam is known as a method in which a desired desired signal reception characteristic can be obtained by directing the beam to a desired signal and suppressing the beam in the interference signal direction at the same time.

FIG. 15 is a diagram showing the structure of a conventional adaptive array for receiving a single carrier signal. In the figure, 1 is an antenna, 2 is an A / D converter, 3 is a weight multiplier, 4
Is an adder, 70 is a weight controller, and 71 is a signal demodulator. As shown in this figure, a plurality of antennas 1 forming an array antenna are provided, and for each antenna 1, an A / D converter 2 for converting its output into a digital signal and the A / D conversion output Is provided with a weight multiplier 3 for multiplying each of them by a weight. The outputs of the weight multipliers 3 are combined by the adder 4 and input to the weight controller 70. In the weight controller 70, the weights to be multiplied by the received signals by the respective weight multipliers 3 are determined so that the beam pattern of the array by the plurality of antennas 1 becomes an optimum beam pattern.

FIG. 16 is a diagram showing a transmission signal format. In the figure, 72 is a frame, 73 is a known signal, and 74 is an information signal. FIG. 17 is a flow chart showing the procedure of weight control in the adaptive array. FIG.
Represents a beam pattern when an adaptive array is used, 75 to 77 represent multipath signals, and 78 represents a beam pattern.

A conventional adaptive array will be described below with reference to FIGS. First, as shown in the format of FIG. 16, the signal is divided into a known signal 73 and an information signal 74 and transmitted in time. After setting the initial weight (step S301 in FIG. 17), the receiver receives these signals using the plurality of antennas 1 shown in FIG. 15 (S302). Next, after the A / D converter 2 A / D-converts the received signal of each antenna 1, the weight multiplier 3 multiplies the received signal from each antenna by a weight (S303). The reception signals from the antennas 1 multiplied by the weights are added and combined in the adder 4 (S304). The combined signal is input to the weight control unit 70, and calculation is performed according to a predetermined algorithm (S305). After the calculation is performed, the weight controller 70 outputs the update weight, and the weight multiplier 3 updates the weight by which the received signal is multiplied (S307). After the weight update,
The series of processes from step S303 is performed again.

Generally, the weight control unit 70 measures a difference between a known signal in the combined signal and a known signal replica of the receiving station, and generally determines a weight so that the weight is determined by a weight determining algorithm. It is used. In particular, as an algorithm for minimizing the squared error between the received known signal and the known signal replica, LMS (LeastMea
n Square) method, RLS (Recursive Least Squares)
And SMI (Sample Matrix Inverse) method are known. For example, in the case of the LMS method, weight updating is performed according to the following formula. Δw = k · E [X · ε] where w is a weight vector representing weights in each antenna in vector format, Δw is a weight update width in each antenna, k is a constant, and X is a signal strength in each antenna. A signal vector expressed in a format, ε represents an error between the composite signal and a known signal replica, and E [·] represents a time average. In the weight control unit 70, when the error ε between the combined signal and the reference signal (known signal replica) becomes equal to or lower than the predetermined level, it is determined that the weight has sufficiently converged, and the weight update processing is ended (S206). Then, the signal demodulation unit 71 demodulates a signal from the output of the adaptive array.

As described above, when the determined weight is used, the beam pattern formed by the plurality of antennas 1 has a pattern as shown by 78 in FIG. In this figure, the arrival paths 75 and 76 are such that their delay times are within the symbol time T of the known signal, and in this case, the paths are combined in phase. Further, it is assumed that the arrival path 77 has a delay time longer than the symbol time T of the known signal with respect to the arrival path 75. in this case,
The incoming path 77 has its reception level suppressed. In this way, it is possible to secure good reception signal characteristics by combining multipaths using the adaptive array antenna.

[0008]

Recently, in wireless communication,
The demand for a system capable of higher speed transmission and higher speed movement has increased, and it has become necessary to perform wideband signal transmission in a radio frequency band. Regarding the transmission of wideband signals, a multi-carrier transmission system in which signals are transmitted in parallel by using a plurality of carriers at the same time has particularly attracted attention recently. In the multi-carrier transmission method, low-speed data are arranged in parallel on the frequency and are simultaneously transmitted using different carriers.
The transmission speed is improved by performing parallel transmission of signals.

This multi-carrier transmission system has a characteristic that it is resistant to the transmission delay of the incoming path and that good transmission can be performed even in a frequency selective fading environment in which the variation characteristic of the received signal changes depending on the frequency. On the other hand, since the frequency band of each carrier transmitted in parallel is small, it has a weak point that it adversely affects other adjacent transmission carriers when the Doppler frequency of the incoming path is high. Therefore, an adaptive array technology for extracting and synthesizing incoming paths having a given transmission delay and a given Doppler frequency among the incoming paths has been a problem. However, at present, no technique has been proposed for applying an adaptive array antenna to such a wideband multicarrier signal. The conventional adaptive array basically targets a single carrier signal using a single frequency, and does not assume the configuration of an adaptive array antenna in a multicarrier signal. As described above, it is required to clearly specify the configuration of the adaptive array that enables the separation and synthesis of the incoming paths for the wideband multicarrier signal. Also,
In order to suppress the adverse effect of an incoming path having a large Doppler frequency on a received signal, an adaptive array technique for suppressing an incoming path having a large Doppler frequency has been a problem.

Therefore, an object of the present invention is to provide a signal receiving apparatus using an adaptive array antenna in a wide band multi-carrier transmission system. Also,
It is an object of the present invention to provide a signal receiving device capable of separating and combining incoming paths when receiving a wideband multicarrier signal. Further, it is another object of the present invention to provide a signal receiving device using an adaptive array antenna capable of suppressing an incoming path having a large Doppler frequency.

[0011]

In order to achieve the above object, the radio receiving apparatus of the present invention receives a multi-carrier signal.
A plurality of antennas for signal, a plurality of weights multipliers to receive signals from a corresponding to the luer antenna is multiplied by a predetermined weight, and a combining unit for combining the outputs of the plurality of weight multipliers, from the synthesis unit a reception signal corresponding to the known signal transmitted are arranged in a plurality of carriers to be output, the double
Multicarrier, which is the sum of known signals on a number of carriers
A weight control section that determines the weight based on a known signal replica . Furthermore, the weight control unit includes a reception signal corresponding to the known signal transmitted are arranged in a plurality of carriers output from the combining unit, is the sum of the known signal in the plurality of carrier
The weight determination algorithm that minimizes the squared error from the known multi-carrier signal replica is used.

Furthermore, other wireless receiving apparatus of the present invention, Ma
It supports multiple antennas that receive
A plurality of weights multipliers to receive signals from the luer antenna is multiplied by a predetermined weight, and a combining unit for combining the outputs of the plurality of weight multipliers, line multicarrier demodulation on the output of the synthesis unit The signal corresponding to each carrier
A known signal among the output signals of the multi-carrier demodulator and each carrier output from the multi-carrier demodulator
For the signal corresponding to the carrier in which
Multiply the carriers of the corresponding frequencies and add them.
As a result, only the carrier where the known signal is placed
Known signal to create multi-carrier known signal by extracting
Multicarrier conversion unit and known signal multicarrier conversion unit
Multi-carrier known signal from
A weight control unit that determines the weight based on the known carrier replica .

Furthermore, the known signal has a predetermined frequency.
Placed on a carrier with several intervals,
Is or is always located in a particular carrier
Will carry a first predetermined number in the initial stages of communication.
In the subsequent communication stage, the first
A second predetermined number of carriers less than the predetermined number of
It is those that.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a basic configuration of a first embodiment of a signal receiving apparatus of the present invention. In the figure, 1 is an antenna, 2 is an A / D converter, 3 is a weight multiplier, 4 is an adder, 5 is a multi-carrier signal corresponding weight control unit, and 6 is a multi-carrier signal demodulation unit. FIG. 2 is a diagram showing a transmission signal format, in which 7 to 9 are multi-carrier signals,
10 is a frame, 11 is a multi-carrier known signal, 12
Represents a multi-carrier information signal. Further, FIG. 3 is a diagram showing a transmission waveform of a multi-carrier known signal, and FIG. 4 is a flowchart showing a weight control procedure of the adaptive array. FIG. 5 shows an example of a beam pattern when the adaptive array of this embodiment is used.
8 to 20 are multipath signals, and 21 is a beam pattern.

First, the format of a multi-carrier signal transmitted will be described with reference to FIG. In the figure, the vertical direction indicates frequency and the horizontal direction indicates time axis. As shown in the figure, in a multi-carrier signal, a plurality of carriers 7 to 9 of a first carrier 7 (frequency # 1), a second carrier 8 (frequency # 2), a third carrier 9 (frequency # 3) ... The signal is transmitted using. Data is arranged in time on each carrier 7 to 9, and data on each carrier 7 to 9 is synchronized in time. In the present invention, each frame 10 of transmission data is divided into a known signal 11 and an information signal 12, and the known signal 11 is used for beam control of an adaptive array. This known signal 11 is inserted in each carrier at the same time. FIG. 3 is a diagram showing a time waveform of a multi-carrier known signal during multi-carrier transmission, and a transmission waveform 17 is given by the sum of known signals 13 to 16 in each carrier of frequencies # 1 to # 4.
As shown in this figure, unlike the known signal in the conventional system, in the multi-carrier transmission, the transmission waveform 17 has a temporally different power.

The adaptive array according to this embodiment will be described below with reference to FIGS. First, in the signal receiving apparatus, after setting the initial weight in the weight multiplier 3 (S101 in FIG. 4), the multi-carrier signal is received using the plurality of antennas 1 shown in FIG. 1 (S102). . Next, in the A / D converter 2, A / D of each signal
After performing the D conversion, the weights of the input signals from the respective antennas 1 are multiplied by the initial weights set by the weight multipliers 3 (S103). Next, the reception signals of the respective antennas multiplied by the weights are added and combined in the adder 4 (S104). The combined signal is input to the weight control unit 5 for multi-carrier, and the known signal replica is used to calculate the optimum weight according to a predetermined algorithm (S105).
After the calculation is performed, the weight control unit 5 corresponding to multi-carrier outputs the update weight corresponding to each of the weight multipliers 3 to update the weight (S10).
7). After the weight is updated, step S10 is executed again.
A series of processes from 3 is repeated until the error between the combined signal and the known signal replica becomes equal to or lower than a predetermined level.

The weight control unit 5 for multi-carrier
Then, the square error between the received known signal and the known signal replica is measured, and the weight is determined so that the square error becomes small. As this method, as described above, the LMS method, the R
The LS method, the SMI method, etc. can be used. For example,
When the LMS method is used, weight update is performed according to the following formula. Δw = k · E [X · ε] where w is a weight vector representing the weight for the received signal of each antenna in vector format, Δw is the update amount of the weight for the received signal of each antenna, k is a constant,
X is a signal vector representing the signal strength of the multicarrier known signal in each antenna in a vector format, ε is the error between the composite signal of the multicarrier known signals and the multicarrier known signal replica, and E [·] is the time average. In addition,
The signal strength of the known multi-carrier signal can be obtained by taking the correlation between the received signal at each antenna and the known signal waveform.

Regarding the update of the weight, when the error between the combined signal and the reference signal (multicarrier known signal replica) is below a predetermined level, it is considered that the weight has sufficiently converged, and the weight update processing is terminated ( S10
8). Further, the output of the adaptive array is demodulated by the multicarrier signal demodulation unit 6.

In the present embodiment, as shown in FIG. 2, the transmission band of the known multicarrier signal is Bm, and the transmission time of the known multicarrier signal is Tm. At this time, the arrival path delay time resolution of the adaptive array is 1
/ Bm [s], Doppler frequency resolution is given by 1 / Tm [Hz]. FIG. 5 is a diagram showing an example of a beam pattern 21 formed by using the adaptive array of this embodiment. In the figure, the incoming path 19 is an incoming path having a delay time of 1 / Bm or more with respect to the incoming path 18, and the incoming path 19 is suppressed by the adaptive array. Further, the incoming path 20 is a path having a Doppler frequency difference of 1 / Tm or more with respect to the incoming path 18, and in this case as well, the signal is suppressed by the adaptive array.

As described above, according to the adaptive array antenna of the present embodiment, it is possible to combine and separate incoming paths using known multi-carrier signals. Delay time 1
Paths within / Bm [s] and Doppler frequencies within 1 / Tm [Hz] are combined, and other paths are suppressed. Therefore,
It is possible to prevent the characteristics of the received signal from deteriorating due to the influence of the Doppler frequency of the multi-carrier signal that differs depending on the path. Further, by setting the transmission bandwidth Bm of the multicarrier known signal, it is possible to set the delay time of the incoming path to be separated, and by setting the transfer time Tm of the multicarrier known signal,
It is possible to set the Doppler frequency difference of the incoming paths to be separated. In the above, the known signal is inserted into all the carriers of the multi-carrier signal and transmitted, but the present invention is not limited to this, and the known signal may be inserted into any of a plurality of carriers. Good.

(Second Embodiment) Next, the second embodiment of the present invention will be described.
Embodiments will be described with reference to FIGS. 6 to 9. FIG. 6 is a diagram showing the basic configuration of the second embodiment of the signal receiving apparatus of the present invention. In the figure, 1 is an antenna, 2 is A /
D converter, 3 is a weight multiplier, 4 is an adder, 30 is a weight controller, 31 is a multi-carrier signal demodulator, 32
˜35 represent demodulated signals. FIG. 7 is a diagram showing a transmission signal format used in this embodiment.
42 are multi-carrier signals, 43 is a known signal insertion unit in a frame, and 44 is an information signal insertion unit. FIG. 8 is a flowchart showing the procedure of weight control in the adaptive array of this embodiment. FIG. 9 is a diagram showing an example of the frequency spectrum of the present embodiment, and 45 shows the state of fading fluctuation at each frequency.

First, the format of a multi-carrier signal transmitted will be described with reference to FIG. In the present embodiment, the known signals are inserted into some carriers instead of inserting the known signals into all the carriers as in the first embodiment described above. In FIG. 7, the carrier 36,
39 and 42 are carriers for inserting known signals, and 3
Reference numerals 7, 38, 40 and 41 are carriers into which no known signal is inserted. Here, the known signal is inserted for every K number of carriers, that is, at equal intervals, but it is not always necessary to do so, and the carrier into which the known signal is inserted can be arbitrarily selected. The known signal is inserted in a plurality of carriers selected in the same time zone.

The adaptive array according to this embodiment will be described below with reference to FIGS. First, in the signal receiving device, after setting the initial weight in each weight multiplier 3 (S201), the multi-carrier signal is received using the plurality of antennas 1 shown in FIG. 6 (S202).
Next, after converting the received signals from the corresponding antennas 1 in the respective A / D converters 2 into digital signals, the respective weight multipliers 3 use the preset initial weights to output from the respective antennas. The received signals are multiplied by weights, and the adder 4 performs signal addition (S203). The added signal (combined signal) is input to the multicarrier signal demodulation unit 31, and a signal corresponding to each carrier is output (S204).

Next, the carrier data in which the known signal is inserted is extracted from the signal of each carrier output from the multicarrier signal demodulation unit 31 (S205), and the multicarrier signal is created again (S206). That is, as shown in FIG. 6, with respect to signals corresponding to carriers (frequency # 1, # K + 1, ..., # NK + 1) in which known signals are inserted, carrier waves (f
1, f1 + KΔf, ..., F1 + NKΔf) to obtain signals 32, 3
35 are generated and added by an adder to create a multicarrier signal. Here, the created multi-carrier signal can be regarded as a multi-carrier signal (hereinafter referred to as a multi-carrier known signal) obtained by extracting only the carrier in which the known signal is inserted.

The multicarrier known signal thus created is input to the weight controller 30 (S207), and the weight is calculated according to the same predetermined algorithm as in the above case. After the calculation is performed, the weight control unit 3
At 0, the update weight is output to each weight multiplier 3,
The weight is updated (S209). The weight control unit 30 has a signal replica corresponding to the known multi-carrier signal in advance, and determines the weight in the direction of minimizing the square error between the known multi-carrier signal and the signal replica. Then, the processes of steps S203 to S209 are repeated until the error between the multi-carrier known signal and the signal replica becomes a predetermined value or less.

As described above, in the present embodiment, the weight of the adaptive array is determined using the known signals inserted in some carriers of the multi-carrier signals. In the above-described first embodiment, known signals are simultaneously inserted into all carriers, whereas in the present embodiment, the main reason for inserting known signals into partial carriers is wireless communication. Fading in the propagation environment. That is, in a radio propagation environment, adjacent carriers often follow the same fading fluctuation.
It also follows different fading variations as the carrier spacing increases. Therefore, even if the number of known signals of adjacent carriers that are highly correlated with fading fluctuation is reduced, the same propagation characteristics are expressed by other carriers, and the influence on the weight determination of the adaptive array is small.
Therefore, as shown in FIG. 9, it is efficient that the known signal is inserted at a frequency interval equal to the fading correlation bandwidth B. In this case, the fading fluctuation characteristic at each frequency can be efficiently represented by using a small number of known signals. Thus, according to the present embodiment, the first
It is possible to improve the transmission efficiency of the information signal as compared with the case of the above embodiment.

(Third Embodiment) This embodiment is basically constructed by efficiently combining the above-described first and second embodiments. FIG. 10 is a diagram showing the basic configuration of the signal receiving apparatus of this embodiment. In the figure, 1 is an antenna, 2 is an A / D converter, 3 is a weight multiplier, 4 is an adder, 30 is a weight control unit, 31 is a multicarrier signal demodulation unit, and 50 is a known signal multicarrier conversion unit. The known signal multicarrier conversion unit 50 has the same configuration as the portion surrounded by the broken line in FIG. 6 described above. Further, FIG. 11 is a diagram showing a format of a transmission signal in the present embodiment.
Reference numeral 6 denotes an all-carrier known signal inserting section, and 47 to 49 denote partial carrier known signal inserting sections. Further, FIG. 12 is a flow chart showing a control procedure in the present embodiment.

First, the format of the multicarrier signal transmitted in this embodiment will be described with reference to FIG. As shown in the figure, in the present embodiment, two signals, that is, all carrier known signals and partial carrier known signals are used together in terms of time. That is, the known signals are inserted into all carriers in the all-carrier known signal inserting unit 46, and the known signals are inserted into all carriers for every predetermined number of frames, for example. On the other hand, in other frames,
As shown by the partial carrier known signal inserting units 47 to 49,
Known signals are inserted in some carriers.

The contents of processing in the signal receiving apparatus according to the present embodiment will be described below with reference to FIGS. 10 to 12. First, the receiving station sets an initial weight in each weight multiplier 3 (S301). When the multi-carrier signal is received, first, the all-carrier known signal insertion unit 46 described above is detected, and the weight control unit 30 uses the combined signal output from the adder 4 and the all-carrier known signal replica to adaptively The weight of the array is determined (S302). This specific weight determining method follows the method (FIG. 4) of the first embodiment described above. When the weight of the adaptive array antenna is determined in this way, the receiving station can receive signals using the adaptive array (S303). Then, demodulation of the multi-carrier signal becomes possible. When the demodulation of the multi-carrier signal becomes possible, the weight control unit 30 causes the partial-carrier known signals 47 to 49 and the partial-carrier known signal from the known signal multi-carrier conversion unit 50, as in the second embodiment described above. Weight update processing is performed using the replica (S304). Further, if the next frame has a partial carrier known signal, step S is performed again.
The process is repeated from 303. If the next frame has all carrier known signals, step S30
The process is repeated from 2.

As described above, in this embodiment, in the initial acquisition stage, the weight determination is performed by all carrier known signals, and the initial acquisition and the multi-carrier signal demodulation are established. Since it is necessary to establish symbol timing synchronization and carrier frequency synchronization in the initial acquisition stage, weight determination is performed using all carrier known signals in this way, and symbol timing synchronization and frequency are determined based on good received signal characteristics. A method of establishing synchronization is effective. Also,
At the stage where symbol timing synchronization and frequency synchronization have become possible and demodulation of a multi-carrier signal has become possible, weight update can be performed using a partial carrier known signal while performing communication. Therefore, by using the partial carrier known signal as in the present embodiment, the insertion area of the known signal can be reduced and the transmission efficiency can be improved.

In the above description, the known signal insertion section for all carriers inserts known signals into all carriers, and the known signal insertion section for partial carriers inserts known signals in some carriers. However, the present invention is not limited to this. The known signal is inserted into the first predetermined number of carriers for each predetermined frame,
In other frames, known signals may be inserted into a second predetermined number of carriers, which is smaller than the first predetermined number. Further, in the above, the all-carrier known signal insertion unit is arranged for every predetermined frame, but the frame position where the known signal is arranged for all carriers or the first predetermined number of carriers does not have to be a fixed cycle. The timing can be arbitrary.

(Fourth Embodiment) In this embodiment, a signal transmission format different from that of the third embodiment is used. FIG. 13 is a diagram showing a transmission signal format of the present embodiment, which is denoted by 46 in the figure.
Represents a known carrier signal insertion unit, and 47 to 49 represent known carrier signal insertion units.

The format of the multi-carrier signal transmitted in this embodiment will be described with reference to FIG. In the present embodiment, as in the third embodiment, two signals, that is, all carrier known signals and partial carrier known signals are used together in terms of time. That is, the known signal is inserted into all carriers in the all carrier known signal inserting section 46. On the other hand, the partial carrier known signal inserting unit 47-
In 49, known signals are inserted in some carriers. At this time, the partial carrier known signal inserting section changes the carrier into which the known signal is inserted, every time. By changing the carrier into which the known signal is inserted in this way, it is possible to uniformly arrange the known signal in the time-frequency domain. This embodiment can be processed according to the configuration shown in FIG. 10, and the known signal multicarrier conversion section 50 extracts only the known signal section and converts it to multicarrier. Further, the processing procedure in this embodiment is the same as the procedure in the third embodiment shown in FIG.

(Fifth Embodiment) This embodiment is configured using a signal transmission format different from those of the third and fourth embodiments described above. However, the basic configuration of this embodiment is the same as that of the fourth embodiment shown in FIG.
It is represented by 0. FIG. 14 is a diagram showing a transmission signal format of this embodiment. In this embodiment, a known signal is always inserted into a specific carrier 51, 54, 57 at a timing other than the all carrier known signal inserting section. I am trying. The processing procedure of the present embodiment is the same as that of the third embodiment shown in FIG. 12, but in the present embodiment, the known signal that is always inserted in the specific carrier 51, 54, 57. Is used to perform weight control processing with temporal continuity. According to this embodiment, since the known signal is data for a long time, it is possible to improve the resolution with respect to the Doppler frequency.

[0035]

As described above, according to the radio receiving apparatus of the present invention, for a wideband multi-carrier signal,
It becomes possible to apply adaptive array technology.
In particular, for a wideband multi-carrier signal having a weak point that the reception characteristic is greatly deteriorated with respect to the Doppler frequency, it is possible to separate the incoming path for each Doppler frequency, and it is possible to greatly improve the reception characteristic. Further, the present invention can be applied to a multicarrier signal having an arbitrary transmission bandwidth. Furthermore, the Doppler frequency required for receiving the information signal,
It is possible to select and receive the conditions of the incoming path regarding the delay time and the like using known signals. Furthermore, it is possible to suppress the interference signal component in the combined signal, and it is possible to receive a high quality signal.

Furthermore, according to the present invention, in which the known signal is arranged in the carrier having the predetermined frequency interval, the transmission efficiency can be improved. Furthermore, according to the present invention, in which the known signal is always allocated to a specific carrier, it is possible to improve the transmission efficiency and further improve the resolution for the Doppler frequency. Furthermore, according to the present invention, the weight control is performed using the output from the combining unit in the initial stage of communication, and the weight control is performed using the demodulation signal from the multicarrier demodulating unit in the subsequent stages. For example, in the initial acquisition stage, various types of synchronization can be established with better reception characteristics, and the insertion area of known signals can be reduced after completion of acquisition, improving transmission efficiency. It will be possible.

[Brief description of drawings]

FIG. 1 is a diagram showing a most basic configuration of a first embodiment of a wireless reception device according to the present invention.

FIG. 2 is a diagram showing a signal transmission format used in the first embodiment according to the present invention.

FIG. 3 is a diagram showing an example of a signal waveform of a known signal used in the first embodiment according to the present invention.

FIG. 4 is a flowchart showing a control procedure of the first embodiment according to the present invention.

FIG. 5 is a diagram showing an example of a beam pattern of an adaptive array according to the first embodiment of the present invention.

FIG. 6 is a diagram showing a most basic configuration of a second embodiment of a wireless reception device according to the present invention.

FIG. 7 is a diagram showing a signal transmission format used in a second embodiment according to the present invention.

FIG. 8 is a flowchart showing a control procedure according to a second embodiment of the present invention.

FIG. 9 is a spectrum diagram showing a channel environment according to a second embodiment of the present invention.

FIG. 10 is a diagram showing the most basic configuration of a third embodiment of a wireless reception device according to the present invention.

FIG. 11 is a diagram showing a signal transmission format used in a third embodiment according to the present invention.

FIG. 12 is a flowchart showing a control procedure of a third embodiment according to the present invention.

FIG. 13 is a diagram showing a signal transmission format used in a fourth embodiment of a wireless reception device according to the present invention.

FIG. 14 is a diagram showing a signal transmission format used in a fifth embodiment of a wireless reception device according to the present invention.

FIG. 15 is a diagram illustrating a basic configuration of a conventional wireless reception device.

FIG. 16 is a diagram showing a signal transmission format used in a conventional wireless reception device.

FIG. 17 is a flowchart showing a control procedure in a conventional wireless reception device.

FIG. 18 is a diagram illustrating an example of an adaptive array beam pattern in a conventional wireless reception device.

[Explanation of symbols]

1 antenna 2 A / D converter 3 weight multiplier 4 adder 5, 30 Weight control unit for multi-carrier signals 6,31 Multi-carrier signal demodulator 7-9 multi-carrier signal 11 known signal 12 Information signal 46 All carrier known signal 47 to 49 partial carrier known signal 50 Known signal multi-carrier conversion unit

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04B ⁷ /02-7/12 H04L 1/02-1/06 H01Q 3/00-3/46 H01Q 21/00-25 / 04

Claims (6)

(57) [Claims] 1. A plurality of antennas for receiving a multicarrier signal, a plurality of weights multiplier for multiplying a predetermined weight with respect to the received signal from the corresponding to Rua antenna, the output of the plurality of weight multipliers synthesis A combining unit, a reception signal corresponding to a known signal transmitted and arranged in a plurality of carriers output from the combining unit, and the plurality of keys.
Multi-carrier known, which is the sum of known signals in carrier
And a weight control unit that determines the weight based on a signal replica . 2. The weight control unit is provided from the combining unit.
A reception signal corresponding to the known signal transmitted are arranged in a plurality of carriers to be output, put on the plurality of carriers
The radio receiving apparatus according to claim 1, wherein a weight determination algorithm that minimizes a squared error from a multi-carrier known signal replica that is a sum of known signals is used. A plurality of antennas for receiving 3. multicarrier signal, a plurality of weights multiplier for multiplying a predetermined weight with respect to the received signal from the corresponding to Rua antenna, the output of the plurality of weight multipliers synthesis a synthesizing unit which, have rows multicarrier demodulation on the output of the combining unit, the
A multi-carrier demodulation unit that outputs a signal corresponding to a carrier, and a signal for each carrier output from the multi-carrier demodulation unit
Signal, which corresponds to the carrier in which the known signal is placed.
Multiply each signal by the carrier of the corresponding frequency
Then, by adding these, the known signal is placed.
Multi-carrier known signal that extracted only existing carriers
And a known signal multicarrier conversion unit for generating
Knowledge signal and corresponding multi-carrier known signal rep
And a weight control unit that determines the weight based on Rika . 4. The radio receiving apparatus according to claim 3 , wherein the known signal is arranged in a carrier having a predetermined frequency interval. 5. The radio receiving apparatus according to claim 3 , wherein the known signal is always arranged on a specific carrier. 6. The known signal is allocated to a first predetermined number of carriers in an initial stage of communication, and in a subsequent communication stage, a second predetermined number of carriers smaller than the first predetermined number. The wireless receiving device according to claim 3, wherein the wireless receiving device is arranged in