WO2023026492A1 - 無線通信方法、無線通信システム、及び送信装置 - Google Patents
無線通信方法、無線通信システム、及び送信装置 Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 61
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- 230000003321 amplification Effects 0.000 claims abstract description 24
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 24
- 238000002789 length control Methods 0.000 claims abstract description 18
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- 238000012549 training Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 2
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- 238000013461 design Methods 0.000 description 1
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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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a wireless communication method, a wireless communication system, and a transmitter.
- Non-Patent Document 1 when a large peak power occurs, the peak power may be amplified within the nonlinear region of the amplifier, and communication quality may deteriorate due to nonlinear distortion (see, for example, Non-Patent Document 1).
- the precoding tap length is a fixed value.
- MOHAMED IBNKAHLA et al., "High-Speed Satellite Mobile Communications: Technologies and Challenges", PROCEEDINGS OF THE IEEE, VOL. 92, NO. 2, FEBRUARY 2004, p.312-339 Keita Kuriyama, Hayato Fukuzono, Masafumi Yoshioka, Tsutomu Tatsuta, "FIR-based transmit beamforming for broadband single-carrier MIMO transmission", The Institute of Electronics, Information and Communication Engineers, IEICE Technical Report, Jan.2019, p.31-36
- the m-th tap coefficient varies depending on the channel state.
- the precoding tap length may be excessive with respect to the tap length required to obtain desired BER (bit error rate) characteristics.
- PAPR Peak to Average Power Ratio
- the tap length may be insufficient, and inter-stream interference and inter-symbol interference may increase.
- the present invention has been made in view of the above problems, and provides a wireless communication method, a wireless communication system, and a transmitting apparatus capable of improving the quality of wireless communication even when channel conditions fluctuate. With the goal.
- a wireless communication method is a wireless communication method for transmitting a signal from a transmitter to a receiver, including a precoding step of precoding a stream of a transmission signal in the time domain using an FIR filter; and an amplification step of amplifying the precoded stream so as to achieve the controlled transmission power.
- a tap length control step for changing the tap length in the precoding step so that the tap length is decreased when the difference is small and the tap length is increased when the difference is large.
- a radio communication system is a radio communication system that transmits a signal from a transmitting device to a receiving device, a precoding unit that precodes a transmission signal stream in the time domain using an FIR filter; a transmission power control unit that controls transmission power of a stream precoded by the precoding unit; an amplification unit that amplifies the stream precoded by the precoding unit according to the control of the transmission power control unit; With respect to a threshold calculated based on received signal quality information fed back from the receiving device that received the stream amplified by the unit, or at least received signal quality information calculated using the characteristics of the amplifying unit and performing control to change the tap length of the precoding unit so that the tap length is decreased when the size of the last tap coefficient of the precoding unit is small, and the tap length is increased when the size of the last tap coefficient of the precoding unit is large. and a tap length control unit.
- a transmission device includes a precoding unit that precodes a stream of a transmission signal in the time domain using an FIR filter, and a transmission that controls transmission power of the stream precoded by the precoding unit.
- a power control unit an amplification unit that amplifies the stream precoded by the precoding unit according to the control of the transmission power control unit, and a reception fed back from a receiving device that received the stream amplified by the amplification unit
- the magnitude of the last tap coefficient of the precoding unit is smaller than the threshold value calculated based on the signal quality information or at least the received signal quality information calculated using the characteristics of the amplifying unit and a tap length control section for controlling the change of the tap length of the precoding section so that the tap length is decreased in the case where the tap length is large, and the tap length is increased in the case where the tap length is long.
- FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to an embodiment
- FIG. FIG. 3 is a functional block diagram illustrating functions of a transmission device of a comparative example
- (a) is a graph illustrating an amplification characteristic of an amplifier.
- (b) is a diagram illustrating a constellation of a transmission signal amplified by an amplifier.
- 5 is a graph illustrating the relationship between amplification characteristics of an amplification unit and the magnitude of PAPR; 7 is a graph showing communication quality with respect to the magnitude of tap coefficients in precoding.
- FIG. 3 is a functional block diagram illustrating functions of a transmission device of a comparative example
- (a) is a graph illustrating an amplification characteristic of an amplifier.
- (b) is a diagram illustrating a constellation of a transmission signal amplified by an amplifier.
- 5 is a graph illustrating the relationship between amplification characteristics of an amplification unit and the magnitude of PAPR
- 7 is a graph showing communication
- FIG. 4 is a diagram showing the relationship between a threshold value ⁇ used by the transmitting device according to one embodiment and a tap length M used for precoding; 3 is a functional block diagram illustrating functions of a transmission device according to one embodiment; FIG. 4 is a flow chart showing an operation example of a transmission device according to an embodiment;
- FIG. 1 is a diagram showing a configuration example of a wireless communication system 1 according to one embodiment.
- the radio communication system 1 is, for example, a MIMO system in which a transmitting device 2 performs MIMO (Multiple Input Multiple Output) transmission to a receiving device 4 .
- MIMO Multiple Input Multiple Output
- the wireless communication system is not limited to the MIMO system, and any system that performs precoding using an FIR (Finite Impulse Response) filter may be a SISO (Single Input Single Output) system or the like.
- FIR Finite Impulse Response
- SISO Single Input Single Output
- the transmitting device 2 has a plurality of antennas, precodes multistreams of transmission signals in the time domain, and performs MIMO transmission to the receiving device 4 .
- the transmitting device 2 also transmits a training signal for calculating channel information (for example, CSI: Channel State Information) to the receiving device 4 .
- CSI Channel State Information
- the receiving device 4 receives the multistreams transmitted by the transmitting device 2 and feeds back the received signal quality information to the transmitting device 2 .
- the received signal quality information that the receiving device 4 feeds back to the transmitting device 2 includes, for example, CQI (Channel Quality Indicator) and PMI (Precoding Matrix Indicator). Also, the receiving device 4 calculates communication channel information using the received training signal, and transmits the calculated communication channel information to the transmitting device 2 .
- the communication channel information may or may not be known to the transmitting device 2 .
- the transmitting device 2 and the receiving device 4 may have the same function so as to transmit and receive respectively.
- FIG. 2 is a functional block diagram illustrating functions of a transmission device 2a of a comparative example.
- the transmitting device 2a of the comparative example includes a plurality of information bit generators 20, a plurality of modulators 21, a precoding unit 22, a plurality of D/A converters 23, a plurality of transmission power controllers 24, and , a plurality of amplifiers 25 and a plurality of antennas 26 .
- the transmitting device 2a can constitute the radio communication system 1 in place of the transmitting device 2 shown in FIG.
- Each of the information bit generators 20 generates information bits (data signals) that serve as transmission signals and outputs them to the modulator 21 .
- Each data signal generated by the information bit generation unit 20 becomes a stream.
- Each modulation unit 21 modulates the data signal input from the information bit generation unit 20 using a predetermined modulation method, and outputs the modulated data signal to the precoding unit 22 .
- Modulation schemes include, for example, QPSK (Quadrature Phase shift Keying) with 4 values per symbol, 16QAM (Quadrature Amplitude Modulation) with 16 values, and 64QAM with 64 values.
- the precoding unit 22 precodes multistreams of data signals (transmission signals) in the time domain using an FIR filter, and outputs each stream to a plurality of D/A conversion units 23 . PAPR increases when the precoding unit 22 performs precoding.
- Each D/A conversion unit 23 D/A converts the stream input from the precoding unit 22 and outputs it to the transmission power control unit 24 .
- Each transmission power control unit 24 controls the transmission power of the stream input from the D/A conversion unit 23 and outputs the stream to the amplification unit 25 . That is, the plurality of transmission power control units 24 respectively control the transmission power of the multistreams precoded by the precoding unit 22 .
- a plurality of amplifiers 25 respectively amplify the multistreams precoded by the precoding unit 22 according to the control of the transmission power control unit 24 and radiate them via the antenna 26 .
- FIG. 3 is a diagram illustrating amplification characteristics of the amplification section 25.
- FIG. 3A is a graph illustrating amplification characteristics of the amplification section 25.
- FIG. 3(b) is a diagram illustrating a constellation of the transmission signal amplified by the amplifier 25. As shown in FIG.
- the amplifier 25 has a linear region in which the input is amplified in proportion to the output and a nonlinear region in which the excessive input is nonlinearly amplified.
- FIG. 4 is a graph illustrating the relationship between the amplification characteristics of the amplification section 25 and the magnitude of PAPR. Even if the average transmission power input to the amplifier 25 is the same, when the PAPR is large, a larger peak power is generated than when the PAPR is small.
- a transmission device of a wireless communication system is configured to be able to control the precoding tap length so that the quality of wireless communication can be improved even if the channel state fluctuates. ing.
- the tap coefficients change.
- the transfer function between the nt - th transmitting antenna and the nr -th receiving antenna is given by the following equation (1).
- the tap coefficient shown in the following formula (4) may be small and the tap length may be excessive.
- the tap coefficient shown in the above formula (4) may be large and the tap length may be insufficient.
- FIG. 5 is a graph showing communication quality with respect to the magnitude of tap coefficients in precoding.
- region A shown in FIG. 5 is a region where quality deterioration due to nonlinear distortion caused by small tap coefficients and large PAPR is dominant.
- Area B has large tap coefficients and is dominated by quality deterioration due to inter-stream interference and inter-symbol interference caused by insufficient tap length.
- the transmitting apparatus of the wireless communication system is configured to set a threshold value ⁇ for the magnitude of the tap coefficient and control the precoding tap length using the threshold value ⁇ .
- FIG. 6 is a diagram showing the relationship between the threshold ⁇ used by the transmission device according to one embodiment and the tap length M used for precoding.
- the threshold ⁇ may be determined while measuring reception quality before communication, or may be updated during communication. Further, in the wireless communication system 1, the threshold ⁇ may be determined in advance based on system design values (such as characteristics of the amplifier 25 used by the transmission device 2 and desired BER characteristics).
- the transmission device sets a threshold value ⁇ for the magnitude of the tap coefficients shown in the following equation (6), calculates the maximum m that satisfies the following equation (7), and uses m+1 as the tap length. Used as M.
- the transmission device may determine the tap length M by calculating the minimum m that satisfies the following equation (8).
- the transmitting apparatus does not use the magnitude of the tap coefficients shown in the above equation (4), but the values shown in the following equation (9), or the taps converted into other easy-to-handle forms.
- the coefficient magnitude may be used to determine the tap length.
- the transmitting apparatus does not use the magnitude of the tap coefficients as they are, but normalizes them with the maximum tap coefficients, for example, as shown in the following equation (10). may be used to determine the threshold.
- FIG. 7 is a functional block diagram illustrating functions of the transmitting device 2b according to one embodiment.
- the transmission device 2b includes a plurality of information bit generation units 20, a plurality of modulation units 21, a precoding unit 22, a plurality of D/A conversion units 23, a plurality of transmission power control A unit 24, a plurality of amplifiers 25, a plurality of antennas 26, a switcher 27, a receiver 28, a channel information acquisition unit 29, a weight calculator 30, a quality information acquirer 31, a threshold calculator 32, and a tap length controller 33. , and a threshold storage unit 34 .
- the same reference numerals are given to the configuration that is substantially the same as the configuration of the transmitting device 2a shown in FIG.
- the transmitting device 2b can configure the wireless communication system 1 in place of the transmitting device 2 shown in FIG.
- the switching unit 27 has a function of switching between transmission and reception performed via the antenna 26 , transmits the output signal of the amplification unit 25 from the antenna 26 , and outputs the signal received by the antenna 26 to the reception unit 28 .
- the receiving section 28 processes the signal received via the antenna 26 and outputs it to the communication channel information obtaining section 29 or the quality information obtaining section 31 .
- the communication channel information acquisition unit 29 acquires communication channel information based on the training signal for the communication channel between the transmission device 2 and the reception device 4 from the signal processed by the reception unit 28, and performs weight calculation unit 30 and threshold calculation. Output to the unit 32 .
- the weight calculation unit 30 uses the channel information acquired by the channel information acquisition unit 29 to calculate precoding weights for the precoding unit 22 for each channel, and applies the channel information and weights to the tap length control unit. 33.
- the quality information acquisition unit 31 acquires quality information from the signal processed by the reception unit 28 and outputs it to the threshold calculation unit 32 .
- the quality information includes the SNR and BER obtained by the receiving device 4 using the training signal (known signal) transmitted by the transmitting device 2, and includes nonlinear distortion by the amplifying unit 25 of the transmitting device 2 and insufficient Includes inter-stream interference effects due to precoding.
- the threshold calculation unit 32 calculates the above-described threshold ⁇ based on the quality information acquired by the quality information acquisition unit 31 and outputs it to the tap length control unit 33 .
- the tap length control unit 33 receives the received signal quality information fed back from the receiving device 4 that received the stream amplified by the amplifying unit 25, or at least the received signal quality information calculated using the characteristics of the amplifying unit 25. With respect to the threshold value ⁇ calculated based on 22 tap length is changed.
- the tap length control unit 33 may perform control to change the tap length of the precoding unit 22 using a threshold ⁇ stored in the threshold storage unit 34, which will be described later. Also, the tap length control unit 33 performs control to change the tap length of the precoding unit 22 each time the weight calculation unit 30 calculates the precoding weight using the channel information.
- the threshold storage unit 34 stores the threshold value ⁇ calculated in advance according to the characteristics of the amplification unit 25, etc., and outputs the threshold value to the tap length control unit 33 in response to access from the tap length control unit 33.
- FIG. 8 is a flowchart showing an operation example of the transmission device 2b according to one embodiment.
- the transmission device 2b transmits a training signal to the reception device 4, and the communication channel information acquisition unit 29 acquires the communication channel information from the reception device 4.
- the weight calculator 30 of the transmission device 2b calculates precoding weights.
- the tap length control section 33 of the transmission device 2b sets the tap length of the precoding section 22 based on the threshold ⁇ .
- step 106 the transmission device 2b performs precoding with the tap length set by the precoding unit 22, and returns to the process of S100.
- the transmission device 2b controls the tap length based on the threshold, so that the quality of wireless communication can be improved even if the channel state fluctuates.
- the receiving device 4 shown in FIG. 1 may also perform the same processing as the transmitting device 2 to calculate the threshold according to the amplification characteristics of the receiving device 4 and the like.
- each unit constituting the transmission device 2b in the above-described embodiment may be configured partially or wholly by hardware, or may be configured by causing a processor to execute a program.
- the program when each unit constituting the transmission device 2b is configured by causing a processor to execute a program partially or entirely, the program may be recorded on a recording medium and supplied, or may be supplied via a network. may be supplied.
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Claims (6)
- 送信装置から受信装置へ信号を伝送する無線通信方法において、
FIRフィルタを用いて時間領域で送信信号のストリームをプリコーディングするプリコーディング工程と、
プリコーディングしたストリームの送信電力を制御する送信電力制御工程と、
制御された送信電力となるように、プリコーディングしたストリームを増幅させる増幅工程と
を含み、
増幅させたストリームを受信した前記受信装置からフィードバックされた受信信号の品質情報、又は、少なくとも前記送信装置の増幅部の特性を用いて算出された受信信号の品質情報に基づいて算出された閾値に対し、前記プリコーディング工程における最後のタップ係数の大きさが、小さい場合にはタップ長を減少させ、大きい場合にはタップ長を増大させるように、前記プリコーディング工程におけるタップ長を変更する制御を行うタップ長制御工程
をさらに含むことを特徴とする無線通信方法。 - 前記送信装置と前記受信装置との間の通信路に対し、トレーニング信号に基づく通信路情報を取得する通信路情報取得工程と、
前記通信路情報を用いて前記プリコーディング工程におけるプリコーディングウェイトを算出するウェイト算出工程と
をさらに含み、
前記タップ長制御工程では、
前記通信路情報を用いてプリコーディングウェイトを算出するごとに、前記プリコーディング工程におけるタップ長を変更する制御を行うこと
を特徴とする請求項1に記載の無線通信方法。 - 送信装置から受信装置へ信号を伝送する無線通信システムにおいて、
FIRフィルタを用いて時間領域で送信信号のストリームをプリコーディングするプリコーディング部と、
前記プリコーディング部がプリコーディングしたストリームの送信電力を制御する送信電力制御部と、
前記送信電力制御部の制御に応じて、前記プリコーディング部がプリコーディングしたストリームを増幅させる増幅部と、
前記増幅部が増幅させたストリームを受信した前記受信装置からフィードバックされた受信信号の品質情報、又は、少なくとも前記増幅部の特性を用いて算出された受信信号の品質情報に基づいて算出された閾値に対し、前記プリコーディング部の最後のタップ係数の大きさが、小さい場合にはタップ長を減少させ、大きい場合にはタップ長を増大させるように、前記プリコーディング部のタップ長を変更する制御を行うタップ長制御部と
を有することを特徴とする無線通信システム。 - 前記送信装置と前記受信装置との間の通信路に対し、トレーニング信号に基づく通信路情報を取得する通信路情報取得部と、
前記通信路情報を用いて前記プリコーディング部に対するプリコーディングウェイトを算出するウェイト算出部と
をさらに有し、
前記タップ長制御部は、
前記ウェイト算出部が前記通信路情報を用いてプリコーディングウェイトを算出するごとに、前記プリコーディング部のタップ長を変更する制御を行うこと
を特徴とする請求項3に記載の無線通信システム。 - FIRフィルタを用いて時間領域で送信信号のストリームをプリコーディングするプリコーディング部と、
前記プリコーディング部がプリコーディングしたストリームの送信電力を制御する送信電力制御部と、
前記送信電力制御部の制御に応じて、前記プリコーディング部がプリコーディングしたストリームを増幅させる増幅部と、
前記増幅部が増幅させたストリームを受信した受信装置からフィードバックされた受信信号の品質情報、又は、少なくとも前記増幅部の特性を用いて算出された受信信号の品質情報に基づいて算出された閾値に対し、前記プリコーディング部の最後のタップ係数の大きさが、小さい場合にはタップ長を減少させ、大きい場合にはタップ長を増大させるように、前記プリコーディング部のタップ長を変更する制御を行うタップ長制御部と
を有することを特徴とする送信装置。 - 前記受信装置との間の通信路に対し、トレーニング信号に基づく通信路情報を取得する通信路情報取得部と、
前記通信路情報を用いて前記プリコーディング部に対するプリコーディングウェイトを算出するウェイト算出部と
をさらに有し、
前記タップ長制御部は、
前記ウェイト算出部が前記通信路情報を用いてプリコーディングウェイトを算出するごとに、前記プリコーディング部のタップ長を変更する制御を行うこと
を特徴とする請求項5に記載の送信装置。
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