WO2021186699A1 - 無線通信方法及び無線通信システム - Google Patents

無線通信方法及び無線通信システム Download PDF

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Publication number
WO2021186699A1
WO2021186699A1 PCT/JP2020/012417 JP2020012417W WO2021186699A1 WO 2021186699 A1 WO2021186699 A1 WO 2021186699A1 JP 2020012417 W JP2020012417 W JP 2020012417W WO 2021186699 A1 WO2021186699 A1 WO 2021186699A1
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WIPO (PCT)
Prior art keywords
matrix
transmission
station device
wireless
reception
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Ceased
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PCT/JP2020/012417
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English (en)
French (fr)
Japanese (ja)
Inventor
圭太 栗山
隼人 福園
吉岡　正文
崇文 林
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NTT Inc
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Nippon Telegraph and Telephone Corp
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Priority to PCT/JP2020/012417 priority Critical patent/WO2021186699A1/ja
Priority to JP2022507985A priority patent/JPWO2021186699A1/ja
Priority to US17/909,206 priority patent/US12199710B2/en
Publication of WO2021186699A1 publication Critical patent/WO2021186699A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0634—Antenna weights or vector/matrix coefficients
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming

Definitions

  • the present invention relates to a wireless communication method and a wireless communication system.
  • wireless communication is performed between the wireless transmitting station device 200 and the wireless receiving station device 300, each of which has N antennas.
  • the radio receiving station device 300 receives the direct wave from the radio transmitting station device 200 and the reflected wave from obstacles 501, 502 and the like.
  • any one of arbitrary transmission antennas in the N transmission antennas of the wireless transmitting station 200 represented by n t, any one of any receiving antennas in the N reception antennas of the radio reception station device 300 Is represented by n r.
  • the CIR Channel Impulse Response
  • the CIR between the transmitting antenna n t and the receiving antenna n r is the transmitting antenna n t for each time in consideration of the delay time, as shown in the right figure of FIG. It is represented by the sum of the gains between and the receiving antenna nr.
  • the transfer function of CIR between the transmitting antenna and the receiving antenna is approximated by the transfer function of FIR (Finite Impulse Response) represented by the following equation (1) in the time direction.
  • FIR Finite Impulse Response
  • z- l is a variable z of the Z-transform, and is a delay operator that performs a time shift.
  • the spatial direction can be represented by a CIR matrix whose matrix element is the CIR in the time direction for each combination of the transmitting antenna and the receiving antenna. As shown in the following equation (2), this CIR matrix becomes the communication path matrix h (z) of N ⁇ N MIMO.
  • Non-Patent Document 1 overlapping signals in the time domain and the spatial domain are separated for each stream as follows. As shown in the following equation (3), since the number of transmitting antennas and receiving antennas is both N, the channel matrix h (z) belongs to the set of N ⁇ N matrices and is regular. Is.
  • the inverse matrix h (z) -1 of the channel matrix h (z) is the inverse response of the determinant (det [h (z)] -1 ) and the transposed adjugate matrix as in the following equation (4). It can be expressed using (adj [h (z)]).
  • det [ ⁇ ] is an operator of the determinant
  • adj [ ⁇ ] is an operator of the transposed adjugate matrix.
  • the transposed adjugate matrix (adj [h (z)]) of the equation (4) also belongs to the set of N ⁇ N matrices as shown in the equation (5) and is regular.
  • det [h (z)] remains as intersymbol interference, but the unit is obtained by multiplying the reception signal of each receiving antenna by det [h (z)] -1 as the reception weight on the receiving side. It can be queued. As a result, intersymbol interference between symbols is suppressed, so that signals that overlap in the time domain and the spatial domain can be separated for each stream.
  • Non-Patent Document 1 uses a translocation adjugate matrix, and since the translocation adjugate matrix is a matrix that can be generated only when the original matrix is a square matrix, the transmission antenna and the reception There is a problem that it cannot be applied when the number of antennas is different, that is, in the case of an non-square MIMO communication path matrix.
  • an object of the present invention is to provide a technique capable of forming an FIR filter type transmitting beam and receiving beam even when the number of antennas on the transmitting side and the number of antennas on the receiving side are different.
  • One aspect of the present invention is a wireless communication method in a wireless communication system including a wireless transmitting station device having a plurality of antennas and a wireless receiving station device having antennas, and transmitting and receiving wireless signals by a single carrier.
  • the radio receiver or the radio transmitter estimates the communication path matrix based on the training signal, and the radio receiver or the radio transmitter device frequencies the estimated communication path matrix.
  • the complex conjugate transmutation matrix of the unitary matrix and the contingent matrix obtained by performing singular value decomposition for each frequency is converted into the time region for the communication path matrix of the converted frequency region after being converted into a region, and each is converted into a time region.
  • the reception weight matrix and the transmission weight matrix are used, and the radio transmission station device forms a transmission beam based on the transmission weight matrix, and the radio reception station device forms a reception beam based on the reception weight matrix. It is a wireless communication method to be performed.
  • One aspect of the present invention is a wireless communication system including a wireless transmitting station device having a plurality of antennas and a wireless receiving station device having antennas, and transmitting and receiving wireless signals by a single carrier.
  • the radio transmission station device includes a communication path estimation unit that estimates a communication path matrix based on a training signal, and the radio reception station device or the radio transmission station device has the communication path estimation unit.
  • the estimated communication path matrix is converted into a frequency region, and the complex conjugate translocation matrix of the unitary matrix and the contingent matrix obtained by performing singular value decomposition for each frequency with respect to the converted communication path matrix in the frequency region is obtained.
  • the radio receiving station apparatus includes a transmission / reception weight calculation unit that converts into a time region and uses each as a reception weight matrix and a transmission weight matrix, and the radio receiving station device forms a reception beam based on the reception weight matrix.
  • the wireless transmission station device is a wireless communication system including a transmission beam forming processing unit that forms a transmission beam based on the transmission weight matrix received from the radio reception station device.
  • the present invention even when the number of antennas on the transmitting side and the number of antennas on the receiving side are different, it is possible to form an FIR filter type transmitting beam and a receiving beam.
  • FIG. 1 is a block diagram showing a configuration of a wireless communication system 100 according to the present embodiment.
  • the wireless communication system 100 includes a wireless transmitting station device 1 and a wireless receiving station device 2.
  • the radio transmission station device 1 includes a bit data generation unit 11, a data signal modulation unit 12, a training signal generation unit 13, a transmission beam formation processing unit 14, a transmission signal conversion unit 15, a reception signal conversion unit 16, and M antennas 17-. It is provided with 1 to 17-M.
  • M is an integer of 2 or more.
  • the bit data generation unit 11 generates bit data of transmission data to be transmitted to the wireless receiving station device 2.
  • the bit data generation unit 11 may perform error correction coding and interleaving when generating bit data.
  • the data signal modulation unit 12 converts the bit data generated by the bit data generation unit 11 into a data signal according to the modulation method.
  • the modulation method for example, quadrature amplitude modulation (QAM (Quadrature Amplitude Modulation)) or the like is applied.
  • the training signal generation unit 13 generates a predetermined training signal that is also known in the radio receiving station device 2.
  • the transmission beam forming processing unit 14 performs a process of forming a transmission beam based on the transmission weight matrix calculated by the transmission / reception weight calculation unit 24 of the wireless receiving station apparatus 2.
  • the transmission beam forming processing unit 14 may normalize the transmission power when forming the transmission beam.
  • the transmission signal conversion unit 15 performs a process of converting the transmission beam formed by the transmission beam formation processing unit 14 into an analog transmission signal transmitted by radio waves from each of the antennas 17-1 to 17-M.
  • the antennas 17-1 to 17-M transmit and receive radio waves to and from the wireless receiving station device 2.
  • the reception signal conversion unit 16 converts the analog reception signal corresponding to the radio wave received by the antennas 17-1 to 17-M into a digital signal.
  • the reception signal conversion unit 16 outputs the transmission weight matrix included in the converted digital signal to the transmission beam formation processing unit 14.
  • the wireless receiving station device 2 includes a reception signal conversion unit 22, a communication path estimation unit 23, a transmission / reception weight calculation unit 24, a transmission signal conversion unit 25, a reception beam formation processing unit 26, a data signal demodulation unit 27, a transmission data detection unit 28, and the transmission data detection unit 28. It is equipped with N antennas 21-1 to 21-N.
  • N is an integer of 2 or more, and N may have the same value as M or a different value.
  • Antennas 21-1 to 21-N transmit and receive radio waves to and from the wireless transmission station device 1.
  • the reception signal conversion unit 22 converts the analog reception signal corresponding to the radio wave received by the antennas 21-1 to 21-N into a digital signal.
  • the reception signal conversion unit 22 When the converted digital signal includes a training signal, the reception signal conversion unit 22 reads the training signal from the digital signal. The reception signal conversion unit 22 outputs the read training signal to the communication path estimation unit 23. Further, when the converted digital signal includes the data signal before the reception beam formation, the reception signal conversion unit 22 reads the data signal before the reception beam formation from the digital signal. The reception signal conversion unit 22 outputs the read data signal before the reception beam formation to the reception beam formation processing unit 26.
  • the communication path estimation unit 23 estimates the communication path matrix h (z) based on the training signal output by the reception signal conversion unit 22.
  • the transmission / reception weight calculation unit 24 calculates the transmission weight matrix and the reception weight matrix based on the communication path matrix h (z) estimated by the communication path estimation unit 23.
  • the transmission / reception weight calculation unit 24 outputs the calculated transmission weight matrix to the transmission signal conversion unit 25.
  • the transmission / reception weight calculation unit 24 outputs the calculated reception weight matrix to the reception beam formation processing unit 26.
  • the transmission signal conversion unit 25 performs a process of converting the transmission weight matrix into an analog transmission signal transmitted by wireless radio waves from each antenna 17-1 to 17-M.
  • the reception beam formation processing unit 26 generates a reception beam based on the reception weight matrix output by the transmission / reception weight calculation unit 24 and the N data signals before the formation of the reception beams corresponding to the antennas 21-1 to 21-N. Form and restore the data signal.
  • the data signal demodulation unit 27 demodulates the data signal by a demodulation method corresponding to the modulation method used by the data signal modulation unit 12 of the radio transmission station device 1 to restore the bit data.
  • the transmission data detection unit 28 detects transmission data from the bit data demodulated by the data signal demodulation unit 27.
  • the transmission data detection unit 28 performs error correction / decoding when the bit data generation unit 11 performs error correction coding, and deinterleaves when the bit data generation unit 11 performs interleaving.
  • FIG. 2 is a sequence diagram showing a processing flow by the wireless communication system 100 of the present embodiment.
  • the training signal generation unit 13 of the radio transmission station device 1 generates a training signal (step S101).
  • the training signal generation unit 13 outputs the generated training signal to the transmission beam formation processing unit 14.
  • the transmission beam forming processing unit 14 forms a transmission beam based on the training signal output by the training signal generation unit 13.
  • the transmission signal conversion unit 15 performs a process of converting the transmission beam formed by the transmission beam formation processing unit 14 into an analog transmission signal transmitted from each of the antennas 17-1 to 17-M. After that, the transmission signal conversion unit 15 transmits an analog transmission signal to the radio reception station device 2 by radio waves via the antennas 17-1 to 17-M (step S102).
  • the transmission beam forming processing unit 14 is not given a transmission weight matrix. Therefore, the transmission beam forming processing unit 14 forms the transmission beam without using the transmission weight matrix. Therefore, the unweighted transmission signal is transmitted from each of the antennas 17-1 to 17-M.
  • Each of the antennas 21-1 to 21-N of the wireless receiving station device 2 receives the transmission signal transmitted by each of the antennas 17-1 to 17-M of the wireless transmitting station device 1 (step S103).
  • the reception signal conversion unit 22 converts the analog reception signal corresponding to the transmission signal received by each of the antennas 21-1 to 21-N into a digital signal.
  • the reception signal conversion unit 22 reads out the training signal included in each of the plurality of converted digital signals.
  • the reception signal conversion unit 22 outputs a plurality of read training signals to the communication path estimation unit 23.
  • the channel estimation unit 23 estimates the channel matrix h (z) based on the plurality of read training signals (step S104). Specifically, the communication path estimation unit 23 is an N ⁇ M matrix represented by the following equation (7) having the above equation (1) as an element of the matrix that approximates the transfer function of CIR with the transfer function of FIR. A certain communication path matrix h (z) is calculated.
  • the CIR length is "L”
  • the wireless receiving station Any one of the two antennas 21-1 to 21-N is defined as nr .
  • the channel estimation unit 23 outputs the estimated channel matrix h (z) to the transmission / reception weight calculation unit 24.
  • the transmission / reception weight calculation unit 24 inputs the communication path matrix h (z) output by the communication path estimation unit 23.
  • the transmission / reception weight calculation unit 24 calculates the transmission weight matrix and the reception weight matrix by singular value decomposition in the frequency domain with respect to the input communication path matrix h (z).
  • the transmission / reception weight calculation unit 24 first performs a discrete Fourier transform (DFT (Discrete Fourier Transform)) on the communication path matrix h (z) as shown in the following equation (8), thereby causing the communication path matrix H (f) in the frequency domain. ) Is calculated (step S105).
  • DFT discrete Fourier Transform
  • the transmission / reception weight calculation unit 24 uses the unitary matrix U (f) of N rows and N columns by performing singular value decomposition on the communication path matrix H (f) in the frequency domain as shown in the following equation (9).
  • the conjugate matrix is calculated (step S106).
  • the conjugate matrix is the complex conjugate transpose V (f) H of the unitary matrix of M rows and M columns.
  • ⁇ (f) is a diagonal matrix of N rows and M columns whose diagonal elements are singular values.
  • the transmission / reception weight calculation unit 24 applies a discrete inverse Fourier transform (IDFT (IDFT)) to U (f) H , which is a complex transposed matrix of the unitary matrix U (f) of N rows and N columns, as shown in the following equation (10).
  • IDFT discrete inverse Fourier transform
  • the matrix in the time region is calculated by performing the Inverse Discrete Fourier Transform).
  • the matrix calculated by the transmission / reception weight calculation unit 24 based on the following equation (10) is referred to as the reception weight matrix wr (z).
  • the transmission / reception weight calculation unit 24 performs a discrete inverse Fourier transform (IDFT) on V (f), which is a complex transposed matrix of the conjugate matrix V (f) H, as shown in the following equation (11). Calculates the matrix in the time domain.
  • transmission and reception weight calculating unit 24 to the matrix calculating a transmission weight matrix w t (z) based on the following equation (11) (step S107).
  • Reception weight calculation unit 24 outputs the calculated transmission weight matrix w t a (z) to the transmission signal conversion unit 25.
  • the transmission / reception weight calculation unit 24 outputs the reception weight matrix wr (z) to the reception beam formation processing unit 26.
  • the reception beam forming processing unit 26 inputs the reception weight matrix wr (z) output by the transmission / reception weight calculation unit 24.
  • Transmission signal conversion unit 25 inputs the transmission weight matrix w t of reception weight calculation unit 24 outputs (z). Transmission signal conversion unit 25 converts the inputted transmission weight matrix w t a (z) into an analog transmission signal. The transmission signal conversion unit 25 transmits the radio wave corresponding to the converted analog transmission signal to the radio transmission station device 1 via the antennas 21-1 to 21-N (step S108).
  • the reception signal conversion unit 16 of the radio transmission station device 1 converts an analog reception signal corresponding to a radio wave received via the antennas 17-1 to 17-M into a digital signal.
  • Reception signal conversion section 16 reads the transmission weight matrix w t contained in the converted digital signal (z) (step S109).
  • Reception signal conversion unit 16 outputs the read transmission weight matrix w t a (z) to the transmission beamforming section 14.
  • Transmission beamforming section 14 inputs the transmit weight matrix w t output from the reception signal converting unit 16 (z).
  • the bit data generation unit 11 generates bit data of transmission data given from the outside.
  • the data signal modulation unit 12 converts the bit data generated by the bit data generation unit 11 into a data signal according to a predetermined modulation method (step S110).
  • the data signal modulation unit 12 outputs the converted data signal to the transmission beam formation processing unit 14.
  • the transmission beam forming processing unit 14 inputs the data signal output by the data signal modulation unit 12. Transmit beamforming processor 14, a data signal input, based on a transmission weight matrix w t (z), to form a transmission beam of the FIR filter type (step S111).
  • the transmission signal conversion unit 15 performs a process of converting the transmission beam formed by the transmission beam formation processing unit 14 into an analog transmission signal transmitted from each of the antennas 17-1 to 17-M.
  • the transmission signal conversion unit 15 transmits the radio wave corresponding to the analog transmission signal to the radio reception station device 2 via the antennas 17-1 to 17-M (step S112).
  • the reception signal conversion unit 22 of the radio reception station device 2 converts the analog reception signal corresponding to the radio wave received via the antennas 21-1 to 21-N into a digital signal (step S113).
  • the reception signal conversion unit 22 reads out the data signal before forming the reception beam from the converted digital signal.
  • the reception signal conversion unit 22 outputs the read data signal before the reception beam formation to the reception beam formation processing unit 26.
  • the reception beam formation processing unit 26 inputs the data signal before the reception beam formation output by the reception signal conversion unit 22.
  • the reception beam formation processing unit 26 restores the data signal by forming an FIR filter type reception beam based on the input data signal before the reception beam formation and the reception weight matrix wr (z) (step). S114).
  • Data signal before receiving beamforming receive beamforming processor 26 is input, i.e., the channel response is multiplied by the communication channel matrix h (z), the transmission weight matrix w t a (z) h (z) It will be represented by w t (z). Multiplying the reception wait matrix wr (z) by the data signal before forming the reception beam gives the following equation (12).
  • ⁇ is the matrix shown in the equation (13), and is a diagonal matrix having the singular value transfer functions ⁇ 1 to q (z) as elements.
  • the reception beam forming processing unit 26 multiplies the reception weight matrix wr (z) by the data signal before forming the reception beam, and ⁇ 1 to q (z) for each row, that is, for each stream. ) Multiply each of -1. This makes it possible to suppress intersymbol interference and separate each stream.
  • ⁇ 1 to q (z) -1 of each stream may be processed so that ⁇ becomes an identity matrix. ..
  • the reception beam forming processing unit 26 outputs the restored data signal to the data signal demodulation unit 27.
  • the data signal demodulation unit 27 inputs the data signal output by the reception beam formation processing unit 26.
  • the data signal demodulation unit 27 demodulates the input data signal and restores the bit data (step S115).
  • the transmission data detection unit 28 detects transmission data from the bit data demodulated by the data signal demodulation unit 27.
  • the transmission data detection unit 28 outputs the detected transmission data to the outside.
  • the wireless communication system 100 of the above embodiment includes a wireless transmitting station device 1 having a plurality of antennas 17-1 to 17-M and a wireless receiving station device 2 having a plurality of antennas 21-1 to 21-M. ..
  • the communication path estimation unit 23 estimates the communication path matrix h (z) based on the training signal received from the radio transmitting station device 1.
  • the transmission / reception weight calculation unit 24 converts the communication path matrix h (z) estimated by the communication path estimation unit 23 into a frequency region, and performs singular value decomposition for each frequency with respect to the converted communication path matrix in the frequency region.
  • the reception beam formation processing unit 26 forms a reception beam based on the reception weight matrix wr (z).
  • the transmission beamforming section 14 based on the transmission weight matrix w t (z) received from the radio reception station 2 performs transmission beamforming. This enables FIR filter type transmission beam formation and reception beam formation even when the number of antennas on the transmitting side and the receiving side are different, that is, even when the communication path matrix h (z) is an non-square matrix. It becomes.
  • the gain of each stream is the transfer function ⁇ 1 (z) to ⁇ q of each singular value. It depends on (z). Therefore, when the correlation of the channel matrix h (z) is high, some singular values are 0, that is, q ⁇ min (N, M). In this case, since some singular values become 0, some of the streams may have low throughput or communication may not be possible, but communication may not be possible in all streams.
  • the transmission weight matrix w t (z) and the reception weight matrix is calculated and w r (z), the transmission weight matrix w t (z) and the reception weights in the time domain in the frequency domain
  • a process of multiplying the matrix w r (z), that is, a process of forming a transmission beam and a reception beam is performed. Therefore, the processing of forming the transmission beam and the reception beam in the time domain can be sequentially performed on the data signal, so that the processing is performed rather than adopting the method of performing the discrete Fourier transform on the data signal. It is possible to reduce the delay.
  • the fast Fourier transform may be applied instead of the discrete Fourier transform, or the fast inverse Fourier transform may be applied instead of the inverse discrete Fourier transform. ..
  • the wireless receiving station device 2 includes the transmission / reception weight calculation unit 24, but the wireless transmission station device 1 includes the transmission / reception weight calculation unit 24, and the reception weight matrix wr ( z) and the transmission weight matrix w t (z) may be calculated.
  • the transmission transmitting signal conversion unit 15 of the wireless transmitting station 1 receives the received from the transmission and reception weight calculator 24 weight matrix w r (z), received by the radio reception station device 2 weight matrix w r a (z) Will be done.
  • the radio transmission station device 1 includes the training signal generation unit 13, and the radio reception station device 2 includes the communication path estimation unit 23.
  • the training signal generation unit 13 may be provided, the radio transmission station device 1 may include the communication path estimation unit 23, and the radio transmission station device 1 may estimate the communication path matrix h (z).
  • the wireless receiving station device 2 includes the transmission / reception weight calculation unit 24, the transmission signal conversion unit 15 of the wireless transmitting station device 1 receives the communication path matrix h (z) from the communication path estimation unit 23 and receives wirelessly.
  • the communication path matrix h (z) will be transmitted to the station device 2.
  • the wireless receiving station device 2 is provided with a plurality of antennas 21-1 to 21-N, but a plurality of wireless receiving station devices 2 including a single antenna 21-1 are provided. There may be a plurality of radio receiving station devices 2 having a plurality of antennas 21-1 to 21-N.
  • the wireless transmitting station device 1 and the wireless receiving station device 2 in the above-described embodiment may be realized by a computer.
  • the program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed.
  • the term "computer system” as used herein includes hardware such as an OS and peripheral devices.
  • the "computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, or a storage device such as a hard disk built in a computer system.
  • a "computer-readable recording medium” is a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short period of time. It may also include a program that holds a program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or a client in that case. Further, the above program may be for realizing a part of the above-mentioned functions, and may be further realized for realizing the above-mentioned functions in combination with a program already recorded in the computer system. It may be realized by using a programmable logic device such as FPGA (Field Programmable Gate Array).
  • FPGA Field Programmable Gate Array
  • Radio transmission station device 1 ... Radio transmission station device, 2 ... Radio reception station device, 11 ... Bit data generation unit, 12 ... Data signal modulation unit, 13 ... Training signal generation unit, 14 ... Transmission beam formation processing unit, 15 ... Transmission signal conversion unit, 16 ... Received signal conversion unit, 17-1 to 17-M ... Antenna, 21-1 to 21-N ... Antenna, 22 ... Received signal conversion unit, 23 ... Communication path estimation unit, 24 ... Transmission / reception weight calculation unit, 25 ... Transmission signal conversion unit, 26 ... Receive beam formation processing unit, 27 ... Data signal demodulation unit, 28 ... Transmission data detection unit

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PCT/JP2020/012417 2020-03-19 2020-03-19 無線通信方法及び無線通信システム Ceased WO2021186699A1 (ja)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016500942A (ja) * 2012-09-28 2016-01-14 インターデイジタル パテント ホールディングス インコ ＷｉＦｉビームフォーミング、フィードバックおよびサウンディング（ＷｉＢＥＡＭ）のための方法
US20190319677A1 (en) * 2018-04-13 2019-10-17 Peraso Technologies Inc. Single-carrier wideband beamforming method and system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4546177B2 (ja) 2003-07-28 2010-09-15 パナソニック株式会社 無線通信装置および無線通信方法
BRPI0617044A2 (pt) * 2005-09-29 2011-07-12 Interdigital Tech Corp sistema de múltiplo acesso por divisão de freqüências e portadora única com base em formação de feixes mimo
JP4775288B2 (ja) * 2006-04-27 2011-09-21 ソニー株式会社 無線通信システム、無線通信装置及び無線通信方法
JP5897810B2 (ja) * 2011-03-29 2016-03-30 シャープ株式会社 基地局装置、端末装置、通信システム、通信方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016500942A (ja) * 2012-09-28 2016-01-14 インターデイジタル パテント ホールディングス インコ ＷｉＦｉビームフォーミング、フィードバックおよびサウンディング（ＷｉＢＥＡＭ）のための方法
US20190319677A1 (en) * 2018-04-13 2019-10-17 Peraso Technologies Inc. Single-carrier wideband beamforming method and system

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