JP5339450B2 - Wireless communication apparatus and wireless communication method - Google Patents

Description

  The present invention relates to a wireless communication apparatus and a wireless communication method, and more particularly to a wireless communication apparatus and a wireless communication method provided with a digital beam former and a digital channelizer.

  In general, in a wireless communication apparatus provided with a digital beam former and a digital channelizer, for reception, signals received by a plurality of antenna elements are converted from analog to digital for each antenna element. Then, signals of all bands received by a plurality of antenna elements are input to a digital beam former (DBF), and a product-sum operation is performed on the weighting coefficients for each antenna element and each beam to perform multi-beam formation. . Then, frequency demultiplexing is performed by a frequency demultiplexing channelizer (single frequency DEMUX), and channel demultiplexing is performed by a digital channelizer (F-DEMUX).

  Similarly, in the case of transmission, channel multiplexing calculation processing is performed by a digital channelizer (F-MUX) for signals in all bands to be transmitted, and frequency multiplexing is performed by a frequency multiplexing channelizer (1 frequency MUX). . Then, a digital beam former (DBF) performs multi-beam forming arithmetic processing, and performs digital / analog conversion for each antenna element for transmission.

  FIG. 4 shows a configuration of a wireless communication apparatus according to the background art (see Patent Document 1). 4 includes N antennas 101_1 to 101_N for transmitting and receiving radio waves, transmission / reception switchers 102_1 to 102_N for switching between transmission and reception, and signals received by the antenna elements 101_1 to 101_N. Low noise amplifiers (LNA) 103_1 to 103_N for performing amplification, frequency converters 104_1 to 104_N for converting received signals to intermediate frequency signals, band pass filters (BPF) 105_1 to 105_N for removing unnecessary frequency components, and amplifiers And transmission system circuits 109_1 to 109_N including exciters and the like. Further, quadrature detection and down-conversion are performed on the digital signals in the intermediate frequency band output from the A / D converters 106_1 to 106_N and the A / D converters 106_1 to 106_N that convert the received signals into digital signals, and the real part / Quadrature detectors (I / QDEM) 107_1 to 107_N and low-pass filters (LPF) 108_1 to 108_N that are output as baseband signals for the imaginary part.

  The radio communication apparatus according to FIG. 4 further includes a digital beam former (DBF) 110 that performs multi-beam formation by multiplying and summing weighting coefficients for the received digital signals output from the low-pass filters (LPF) 108_1 to 108_N. , Frequency demultiplexing channelizers (1 frequency DEMUX) 111_1_A to 111_L_A for performing frequency demultiplexing for each beam (beam 1, beam 2,..., Beam L) formed by the digital beam former (DBF) 110; Digital channelizers (F-DEMUX) 111_1_B to 111_L_B that perform channel demultiplexing for each frequency band demultiplexed by one frequency DEMUX, and a time division multiplexer that time-division-multiplexes digital signals after channel demultiplexing ( T-MUX) 113.

  In the wireless communication apparatus according to FIG. 4, signals received by the antenna elements 101_1 to 101_N are amplified by the low noise amplifiers (LNA) 103_1 to 103_N via the transmission / reception switchers 102_1 to 102_N, and intermediated by the frequency converters 104_1 to 104_N. The frequency is converted into a frequency signal. Then, unnecessary frequency components are removed by band pass filters (BPF) 105_1 to 105_N, and converted into digital signals by A / D converters 106_1 to 106_N. Further, quadrature detection and down-conversion are performed for each signal received by the antenna elements 101_1 to 101_N by the quadrature detectors (I / QDEM) 107_1 to 107_N and the low-pass filters (LPF) 108_1 to 108_N, and the real part / imaginary part is obtained. As a baseband signal of each part.

  A digital beam former (DBF) 110 performs a product-sum operation on weighting coefficients for each received digital signal to form a multi-beam. Frequency demultiplexing channelizers (single frequency DEMUX) 111_1_A to 111_L_A perform frequency demultiplexing for each beam formed by the digital beam former (DBF) 110. The digital channelizers (F-DEMUX) 111_1_B to 111_L_B perform channel demultiplexing for each frequency band demultiplexed by the frequency demultiplexing channelizers (single frequency DEMUX) 111_1_A to 111_L_A. A time division multiplexer (T-MUX) 113 time division multiplexes the digital signal after channel demultiplexing.

  Patent Document 2 discloses a technique related to a system for digital processing of satellite communication data. The digital payload disclosed in US Pat. No. 6,057,049 is a digital channelizer configured to divide a subband spectrum into a plurality of frequency slices, and routes each of the plurality of frequency slices to at least one of a plurality of receiving ports. A digital switch matrix configured to communicate with a receiving port to receive a plurality of frequency slices and recombine the frequency slices to form a plurality of output subbands for transmission on the output beam of the communication satellite And a digital combiner configured as described above.

JP 2002-185378 A JP-T-2006-516867

  In recent years, in systems that share the frequency band used for communications via ground facilities and communications via satellites, in the normal state, most of the frequency bands used are allocated to communications via ground facilities, and communications via satellites are also possible. However, a system that uses only a part of the frequency band in the sea or in the mountainous area and maintains the service by increasing the ratio of the band used for communication via the satellite in the event of an abnormality such as a disaster is about to be put into practical use.

  In such a system, it is necessary to have a circuit capable of processing the entire used frequency band in preparation for an abnormal time, but only a part of the frequency band is used in a steady state. For example, in the case of the receiving wireless communication apparatus shown in FIG. 4, the digital beam former (DBF) 110 needs to execute the beam forming calculation process even in a band without an input signal, resulting in wasted power consumption. There is a problem. Similarly, in the case of a wireless communication device for transmission, when there is a frequency band without an output signal, it is necessary to execute a beam forming calculation process in a frequency band without an output signal, resulting in wasted power consumption. There is a problem of doing.

  In view of the above problems, an object of the present invention is to provide a wireless communication apparatus and a wireless communication method capable of suppressing waste of power consumption.

  A wireless communication apparatus according to the present invention is provided corresponding to a plurality of reception modules for converting received radio waves into reception digital signals, and corresponding to the plurality of reception modules. The reception digital signals are classified into i types (i is a positive integer). And a plurality of frequency demultiplexing channelizers that output the signals demultiplexed to the frequency bands for each frequency band, and i types of frequency bands that are provided for each of the frequency bands and output from the plurality of frequency demultiplexing channelizers. A plurality of digital beam formers for inputting a demultiplexed signal for each frequency band and multiplying and summing weighting coefficients for each of the demultiplexed signals to form a multi-beam.

  A radio communication apparatus according to the present invention includes a demultiplexer that parallelizes time-division multiplexed digital signals for each channel, and a plurality of digital channels that perform channel multiplexing on each signal output from the demultiplexer. A plurality of risers, which are provided for each of i frequency bands (i is a positive integer), perform a product-sum operation on weighting coefficients for the multi-beams output from the digital channelizer, and output a digital signal after the operation Digital beam formers and the digital signals output from the digital beam formers provided for each of the i types of frequency bands are input, and the digital signals of i types of frequency bands are combined to transmit signals. A frequency multiplexing channelizer for generating the frequency multiplexing channelizer, and provided for each of the frequency multiplexing channelizers. It receives the transmission signal generated by the channelizer includes a plurality of transmission modules the transmission signal to wirelessly transmit, an.

  The radio communication method according to the present invention converts a received radio wave into a received digital signal, and outputs a signal obtained by demultiplexing the received digital signal into i types (i is a positive integer) of frequency bands for each frequency band. For each frequency band, multi-beams are formed by multiplying and summing weighting coefficients for the signals demultiplexed into the i types of frequency bands.

  The wireless communication method according to the present invention parallelizes a time-division multiplexed digital signal for each channel, performs channel multiplexing on each of the paralleled signals, and generates i frequency bands (where i is a positive frequency band). For each of the channel combined multi-beams, multiplying and summing weighting coefficients to generate a digital signal, combining the digital signals in the i frequency bands to generate a transmission signal, The transmission signal is transmitted wirelessly.

  According to the present invention, it is possible to provide a wireless communication apparatus and a wireless communication method capable of suppressing waste of power consumption.

1 is a block diagram showing a wireless communication device (receiver) according to a first exemplary embodiment; FIG. 3 is a block diagram showing a wireless communication device (transmitter) according to a second exemplary embodiment. It is a figure for demonstrating the effect of this invention. It is a block diagram for demonstrating the radio | wireless communication apparatus concerning background art.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram for explaining a radio communication apparatus (receiver) according to the present embodiment. A wireless communication apparatus according to FIG. 1 includes N antenna elements 1_1 to 1_N (N is a positive integer) for transmitting and receiving radio waves, transmission / reception switchers 2_1 to 2_N for switching between transmission and reception, and each antenna element. Low-noise amplifiers (LNA) 3_1 to 3_N that amplify signals received by 1_1 to 1_N, frequency converters 4_1 to 4_N that convert each received signal to an intermediate frequency signal, and a band-pass filter that removes unnecessary frequency components ( BPF) 5_1 to 5_N and transmission system circuits (refer to FIG. 2) 9_1 to 9_N including amplifiers, exciters and the like. Further, quadrature detection and down-conversion are performed on the digital signals in the intermediate frequency band output from the A / D converters 6_1 to 6_N and the A / D converters 6_1 to 6_N that convert the received signals into digital signals, and the real part / Quadrature detectors (I / QDEM) 7_1 to 7_N and low-pass filters (LPF) 8_1 to 8_N that are output as baseband signals of the imaginary part. These constitute the receiving modules 15_1 to 15_N.

  The radio communication apparatus (receiver) according to FIG. 1 further includes i types (i is a positive integer) of frequencies for each reception module 15_1 to 15_N with respect to the reception digital signals generated by the reception modules 15_1 to 15_N. Frequency demultiplexing channelizers (i-frequency DEMUX) 10_1 to 10_N that perform demultiplexing to the bands (F1 to Fi) are provided. Also, for each of the frequencies F1 to Fi demultiplexed by the frequency demultiplexing channelizers (i-frequency DEMUX) 10_1 to 10_N, a weighting coefficient is applied to the signals output from the frequency demultiplexing channelizers (i-frequency DEMUX) 10_1 to 10_N. Digital beam formers (DBF) 11_1 to 11_i that perform multi-beam formation by product-sum operation are provided. Further, a digital channelizer (F−) that performs channel demultiplexing for each beam (beam 1, beam 2,..., Beam M: M is a positive integer) generated by the digital beam formers (DBF) 11_1 to 11_i. DEMUX) 12_1_1 to 12_i_M and a time multiplexer (T-MUX) 13 for time-division multiplexing the digital signal after channel demultiplexing.

  Next, the operation of the wireless communication apparatus shown in FIG. 1 will be described. In the radio communication apparatus according to FIG. 1, signals received by the antenna elements 1_1 to 1_N are amplified by the low noise amplifiers (LNA) 3_1 to 3_N via the transmission / reception switchers 2_1 to 2_N, and intermediated by the frequency converters 4_1 to 4_N. The frequency is converted into a frequency signal. Then, unnecessary frequency components are removed by band pass filters (BPF) 5_1 to 5_N, and converted into digital signals by A / D converters 6_1 to 6_N. Further, quadrature detection (I / QDEM) 7_1 to 7_N and low-pass filters (LPF) 8_1 to 8_N perform quadrature detection and down-conversion for each signal received by antenna elements 1_1 to 1_N, and real part / imaging As a baseband signal of each part.

  The frequency demultiplexing channelizers (i-frequency DEMUX) 10_1 to 10_N receive the signals output from the receiving modules 15_1 to 15_N, respectively, and demultiplex them into i types of frequency bands (F1 to Fi). Signals are output to digital beam formers (DBF) 11_1 to 11_i corresponding to F1 to Fi), respectively. Digital beam formers (DBF) 11_1 to 11_i perform multi-beam formation by multiplying and multiplying weighting coefficients for signals output from frequency demultiplexing channelizers (i-frequency DEMUX) 10_1 to 10_N for each frequency of F1 to Fi. I do. For example, the digital beam former (DBF) 11_1 corresponding to the frequency F1 receives signals corresponding to the frequency F1 from the frequency demultiplexing channelizers (i-frequency DEMUX) 10_1 to 10_N, and each receiving module receives these signals. A product-sum operation is performed on the weighting coefficients corresponding to 15_1 to 15_N to form multi-beams (beam 1 to beam M).

  The digital channelizers (F-DEMUX) 12_1_1 to 12_i_M perform channel demultiplexing for each beam (beam 1, beam 2,..., Beam M) generated by the digital beam formers (DBF) 11_1 to 11_i. A time multiplexer (T-MUX) 13 time-division multiplexes the digital signal after channel demultiplexing.

  In the wireless communication apparatus (receiver) shown in FIG. 1 having the above-described configuration, when there is a frequency band without an input signal, calculation for beam formation is not performed in the frequency band without an input signal. It is possible to suppress waste of power consumption.

  The reason is as follows. In the wireless communication apparatus (receiver) shown in FIG. 1, frequency demultiplexing channelizers (i-frequency DEMUX) 10_1 to 10_N for demultiplexing to each frequency band are provided in front of digital beam formers (DBF) 11_1 to 11_i. Yes. Thereby, the digital beam formers (DBF) 11_1 to 11_i can form multi-beams for each frequency. Therefore, when there is a frequency band without an input signal, it is possible not to perform an operation for beam formation in the frequency band without an input signal. That is, wasteful power consumption in the digital beam formers (DBF) 11_1 to 11_i can be suppressed by not performing the operations of the digital beam formers (DBF) 11_1 to 11_i for the frequency band having no input signal.

  When all the clusters (beam 1 to beam M) are configured with the same frequency arrangement (i frequency repetition), that is, all the clusters (beam 1 to beam M) are one digital beam former (for example, F1_DBF). In the case of processing at 11_1, the calculation amount of the digital beam formers (DBF) 11_1 to 11_i can be reduced to 1 / i as compared with the background art by the invention according to the present embodiment. Therefore, the larger the value of i, that is, the greater the frequency demultiplexing number (frequency repetition number), the greater the effect of reducing the amount of calculation.

  On the other hand, when the frequency arrangement is different in some clusters, frequency division is performed so that one channel is not separated into a plurality of frequency bands by the frequency demultiplexing channelizers (i-frequency DEMUX) 10_1 to 10_N. Further, when one cell (beam) extends over a plurality of frequency bands, the beam forming operation for the cell (beam) is additionally executed by the digital beam formers (DBF) 11_1 to 11_i of the corresponding frequency band. By doing so, a desired beam formation is possible.

  An example of the calculation amount when the frequency arrangement is different in some clusters is shown below. For example, a case will be described in which the number of frequency demultiplexing (frequency repetition number: i = 7) is 50% for clusters having the same frequency arrangement configuration, and the frequency arrangement configuration is different for the remaining 50% clusters. Specifically, for example, a case where 50% cluster calculation is performed in F1_DBF (11_1) and the remaining 50% cluster calculation is performed in F2_DBF to F7_DBF (11_2 to 11_7) will be described. In this case, if the amount of calculation in the configuration of the receiving digital beam forming apparatus according to the background art is A, the amount of calculation in the receiving digital beam formers (DBF) 11_1 to 11_7 of the wireless communication apparatus according to the present embodiment is A / 7 (1 + 6 * 0.5) = A * 4/7.

  In addition, for example, a case will be described in which the number of frequency demultiplexing (frequency repetition number: i = 8) is 50% of clusters having the same frequency arrangement configuration, and the frequency arrangement configuration is different in the remaining 50% of clusters. Specifically, for example, a case where 50% cluster calculation is performed in F1_DBF (11_1) and 50% cluster calculation is performed in F2_DBF to F8_DBF (11_2 to 11_8) will be described. In this case, if the amount of calculation in the configuration of the receiving digital beam forming apparatus according to the background art is A, the amount of calculation in the receiving digital beam formers (DBF) 11_1 to 11_8 of the wireless communication apparatus according to the present embodiment is A / 8 (1 + 7 * 0.5) = A * 9/14.

  Therefore, in the wireless communication apparatus according to the present embodiment, the amount of calculation can be sufficiently reduced even when the frequency arrangement is different in some clusters. Note that the worst case in the wireless communication apparatus according to the present embodiment is when all the clusters have different frequency arrangements, but in this case as well, the amount of calculation is the same as in the case of the background art. The amount will not increase. Therefore, in the wireless communication apparatus according to the present embodiment, it is possible to reduce the amount of calculation during actual operation while maintaining flexibility.

  Next, the effect of the invention according to the present embodiment will be described with reference to FIG. In FIG. 3, the horizontal axis represents the ratio of the actual use bandwidth of the satellite to the maximum frequency bandwidth of the satellite (the use frequency band of communication via ground facilities + the use frequency band of communication via satellite). The vertical axis indicates the number of multiplications per unit time of the frequency demultiplexing channelizers (i-frequency DEMUX) 10_1 to 10_N and the digital beam formers (DBF) 11_1 to 11_i when all clusters are configured with the same frequency arrangement. Is an estimated value.

  For estimation, the maximum frequency bandwidth is 30 MHz, the number of receiving modules (value of N) = 128, the number of clusters (value of M) = 18, the number of frequency demultiplexing (frequency repetition number: value of i) = 8. The filter method is an FFT filter and the number of taps is 10.

  Further, as the number of multiplications per unit time shown in FIG. 3, the multiplication per unit time of the digital beam former (DBF) 110 and the frequency demultiplexing channelizer (single frequency DEMUX) 111_1_A to 111_L_A in the background art shown in FIG. The total number of times and the total number of multiplications per unit time of the frequency demultiplexing channelizers (i-frequency DEMUX) 10_1 to 10_N and the digital beam formers (DBF) 11_1 to 11_i in the invention according to the present embodiment are calculated. ing. The number of multiplications in the digital channelizer (F-DEMUX) section is not included in the calculated value because there is no difference between the background art and the invention according to the present embodiment.

  As shown in FIG. 3, in the “steady state” where the ratio of the actual satellite use bandwidth to the maximum frequency bandwidth is low, the wireless communication device according to the present embodiment reduces the number of multiplications per unit time by about 50%. I understand. Since the power consumption is proportional to the number of multiplications per unit time, the wireless communication apparatus according to the present embodiment can reduce the power consumption in the steady state.

Embodiment 2. FIG.
The second embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram for explaining the radio communication apparatus (transmitter) according to the present embodiment. The radio communication apparatus according to the present embodiment shown in FIG. 2 includes a demultiplexer (T-DEMUX) 21 that parallelizes time-division multiplexed digital signals for each channel, and digital beam formers (DBF) 23_1 to 23_i. Are provided with digital channelizers (F-MUX) 22_1_1 to 22_i_M that perform channel multiplexing for each of the beams formed in FIG. Further, a digital beam former (DBF) 23_1 to 23_i that outputs a transmission digital signal of each transmission module for each frequency of F1 to Fi by multiplying and multiplying weighting coefficients for the transmission signals of the multi-beams, frequency multiplexing channelizers (i-frequency MUX) 24_1 to 24_N that perform multiplexing from i types of frequency bands (F1 to Fi).

  Further, quadrature modulation (up-conversion) is performed for each element on the baseband signals of the real part / imaginary part and output as intermediate frequency band signals, and quadrature modulators (I / QMOD) 25_1 to 25_N and quadrature modulators ( I / QMOD) D / A converters 26_1 to 26_N for converting transmission signals from 25_1 to 25_N into analog signals, transmission system circuits 27_1 to 27_N including amplifiers, exciters, and the like, and switching between transmission and reception It includes transmission / reception switchers 28_1 to 28_N, reception system circuits (refer to FIG. 1) 29_1 to 29_N including LNAs, frequency converters, and the like, and N antenna elements 30_1 to 30_N for transmitting and receiving radio waves. Here, transmission modules 35_1 to 35_N are configured from the quadrature modulators (I / QMOD) 25_1 to 25_N to the antenna elements 30_1 to 30_N.

  Next, the operation of the wireless communication apparatus (transmitter) according to this embodiment will be described. The demultiplexer (T-DEMUX) 21 parallelizes the time-division multiplexed digital signal for each channel. The digital channelizers (F-MUX) 22_1_1 to 22_i_M perform channel multiplexing for each beam (beam 1 to beam M) formed by each digital beam former (DBF) 23_1 to 23_i. The digital beam formers (DBF) 23_1 to 23_i perform product-sum operations on weighting coefficients for the transmission signals of multi-beams (beam 1 to beam M), and respectively apply to frequency multiplexing channelizers (i-frequency MUX) 24_1 to 24_N. Outputs the transmission digital signal. The frequency multiplexing channelizers (i-frequency MUX) 24_1 to 24_N input signals from the digital beam formers (DBF) 23_1 to 23_i, and multiplex signals of i types of frequency bands (F1 to Fi). A transmission signal corresponding to each of the transmission modules 35_1 to 35_N is output.

  Quadrature modulators (I / QMOD) 25_1 to 25_N perform quadrature modulation and up-conversion on the baseband signals of the real part and the imaginary part, and output intermediate frequency band signals. The D / A converters 26_1 to 26_N convert each transmission signal into an analog signal. The transmission analog signals output from the D / A converters 26_1 to 26_N are transmitted from the antenna elements 30_1 to 30_N via the transmission system circuits 27_1 to 27_N and the transmission / reception switchers 28_1 to 28_N including amplifiers and exciters.

  In the wireless communication apparatus (transmitter) shown in FIG. 2 having the above configuration, when there is a frequency band without an output signal, calculation for beam formation is not performed in the frequency band without an output signal. It is possible to suppress waste of power consumption.

  The reason is as follows. In the wireless communication apparatus (transmitter) shown in FIG. 2, frequency multiplexing channelizers (i-frequency MUXs 24_1 to 24_N) for multiplexing from each frequency band are provided in the subsequent stage of each digital beam former (DBF) 23_1 to 23_i. Yes. Thereby, each digital beam former (DBF) 23_1 to 23_i can form a multi-beam for every frequency. Therefore, when there is a frequency band without an output signal, it is possible not to perform an operation for beam formation in the frequency band without an output signal. That is, wasteful power consumption in the digital beam formers (DBF) 23_1 to 23_i can be suppressed by not performing the operations of the digital beam formers (DBF) 23_1 to 23_i for the frequency band having no input signal.

  The wireless communication apparatus (transmitter) according to the present embodiment can also obtain the same effects as those of the invention described in the first embodiment shown in FIG.

  In the technique according to Patent Document 1 described in the background art, the value of the intermediate frequency converted by the frequency converters 104_1 to 104_N and the passband of the bandpass filters (BPF) 105_1 to 105_N are made variable by setting. Thus, by performing parallel processing or time division processing, it is possible to cope with the change and expansion of the frequency band of the input signal without increasing the amount of hardware. On the other hand, the invention according to the present embodiment is not a technique for dealing with the change and expansion of the frequency band of the input signal, and there is a band without input in the frequency band of the fixed input signal. This is a technique for coping with the case, and is different from the technique according to Patent Document 1.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the configuration of the above embodiment, and can be made by those skilled in the art within the scope of the invention of the claims of the claims of the present application. It goes without saying that various modifications, corrections, and combinations are included.

1_1 to 1_N antenna elements 2_1 to 2_N transmission / reception switchers 3_1 to 3_N low noise amplifier (LNA)
4_1 to 4_N Frequency converters 5_1 to 5_N Band pass filter (BPF)
6_1 to 6_N A / D converters 7_1 to 7_N Quadrature detectors 8_1 to 8_N Low-pass filter (LPF)
9_1 to 9_N Transmission system circuits 10_1 to 10_N Frequency demultiplexing channelizer (i-frequency DEMUX)
11_1 to 11_i digital beam former (DBF)
12_1_1 to 12_i_M Digital channelizer (F-DEMUX)
13 time multiplexer (T-MUX)
15_1 to 15_N reception module 21 demultiplexer (T-DEMUX)
22_1_1 to 22_i_M Digital channelizer (F-MUX)
23_1 to 23_i Digital Beamformer (DBF)
24_1 to 24_N Frequency multiplexing channelizer (i-frequency MUX)
25_1 to 25_N Quadrature modulator (I / QMOD)
26_1 to 26_N D / A converters 27_1 to 27_N transmission system circuits 28_1 to 28_N transmission / reception switchers 29_1 to 29_N reception system circuits 30_1 to 30_N antenna elements 35_1 to 35_N transmission modules

Claims (7)

A plurality of receiving modules for converting received radio waves into received digital signals;
A plurality of frequency demultiplexing channelizers provided corresponding to the plurality of receiving modules and outputting a signal obtained by demultiplexing the received digital signal into i types (i is a positive integer) of frequency bands;
Provided for each of the frequency bands, a signal demultiplexed into i types of frequency bands output from the plurality of frequency demultiplexing channelizers is input for each of the frequency bands, and for each of the demultiplexed signals the weighting factors possess a plurality of digital beamformer for forming a multi-beam and accumulate operations and Te,
The digital beamformer does not perform arithmetic processing for forming a multi-beam in a frequency band without an input signal among the i types of frequency bands.
Wireless communication device. A plurality of digital channelizers for performing channel demultiplexing for each of the beams generated by the plurality of digital beam formers;
A time multiplexer for time-division multiplexing the digital signal demultiplexed by the digital channelizer;
The wireless communication device according to claim 1, further comprising: Each of the plurality of receiving modules is
An antenna element;
A low noise amplifier for amplifying a signal received by the antenna element;
A frequency converter that converts the signal amplified by the low-noise amplifier into an intermediate frequency signal;
A bandpass filter for removing unwanted frequency components from the intermediate frequency signal;
An A / D converter that converts a signal that has passed through the band-pass filter into a digital signal;
A quadrature detector that performs quadrature detection on the intermediate frequency band digital signal output from the A / D converter;
A low-pass filter that down-converts the quadrature-detected signal and outputs a baseband signal of each of a real part and an imaginary part;
The wireless communication device according to claim 1, comprising: A demultiplexer that parallelizes the time-division multiplexed digital signal for each channel;
A plurality of digital channelizers for performing channel multiplexing on each signal output from the demultiplexer;
A plurality of digital beams which are provided for each of i types of frequency bands (i is a positive integer), perform a product-sum operation on weighting coefficients for the multi-beams output from the digital channelizer, and output the calculated digital signals A former,
A frequency multiplexing channelizer that inputs each digital signal output from the digital beam former provided for each of the i types of frequency bands and combines the digital signals of the i types of frequency bands to generate a transmission signal. When,
Wherein provided in each frequency multiplexing channelizer, receives the transmission signal generated by the frequency multiplexing channelizer, possess a plurality of transmission modules the transmission signal to wirelessly transmit, to,
Of the digital beam formers provided for each of the i types of frequency bands, the digital beam former that does not receive the multi-beam transmission signal output from the digital channelizer does not perform arithmetic processing.
Wireless communication device. Each of the plurality of transmission modules is
A quadrature modulator that performs quadrature modulation and up-conversion on each baseband signal of the real part / imaginary part to generate an intermediate frequency band signal;
A D / A converter that converts the intermediate frequency band signal generated by the quadrature modulator into an analog signal;
An antenna element for wirelessly transmitting the analog signal;
The wireless communication device according to claim 4 , comprising: And converting the received radio waves received digital signal,
The received digital signal a i type (i is a positive integer) and outputting demultiplexed signals to the frequency band of each said frequency band,
For each frequency band, forming a multi-beam by multiplying and summing weighting coefficients for the signals demultiplexed into the i types of frequency bands, and
The step of forming the multi-beam does not perform a calculation process for forming a multi-beam in a frequency band without an input signal among the i types of frequency bands.
Wireless communication method. Comprising the steps of parallelizing each channel time-division multiplexed digital signal,
And line Cormorant step a channel multiplexing to the parallelized each signal,
For each i frequency band (i is a positive integer), a step of multiplying and summing weighting coefficients for the channel combined multi-beams to generate a digital signal;
Combining the digital signals of the i types of frequency bands to generate a transmission signal;
Wirelessly transmitting the transmission signal, and
The step of generating the digital signal does not perform an arithmetic process for generating the digital signal in a frequency band in which the multi-beam is not input among the i types of frequency bands.
Wireless communication method.

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