WO2013185481A1 - Dispositif et procédé de traitement anti-interférence pour la réception de signal basés sur plusieurs antennes - Google Patents

Dispositif et procédé de traitement anti-interférence pour la réception de signal basés sur plusieurs antennes Download PDF

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Publication number
WO2013185481A1
WO2013185481A1 PCT/CN2013/070208 CN2013070208W WO2013185481A1 WO 2013185481 A1 WO2013185481 A1 WO 2013185481A1 CN 2013070208 W CN2013070208 W CN 2013070208W WO 2013185481 A1 WO2013185481 A1 WO 2013185481A1
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WIPO (PCT)
Prior art keywords
signal
antenna
local
interference
receiving
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PCT/CN2013/070208
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English (en)
Chinese (zh)
Inventor
刘晟
程宏
王锐
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华为技术有限公司
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Publication of WO2013185481A1 publication Critical patent/WO2013185481A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Definitions

  • Embodiments of the present invention relate to the field of wireless communications, and in particular, to a signal receiving and anti-interference processing method and apparatus based on multiple antennas. Background technique
  • the base station communicates with multiple User Terminals (UEs) within its coverage in both directions.
  • the process in which the base station sends a signal to the user terminal is called downlink communication, and the process in which the terminal sends a signal to the base station is called uplink communication.
  • Full-duplex technology enables simultaneous uplink and downlink transmission on the same time-frequency resource, and its spectrum efficiency is twice that of simplex and half-duplex.
  • the local transmitting antenna is close to the local receiving antenna 4, so the local receiving antenna receives the useful signal of the transmitting antenna at the same time, and also receives the signal transmitted by the local transmitting antenna.
  • the power of the local transmitting signal is very large, which is very strong. Interference must be performed at the analog front end, otherwise the analog front end will be blocked, resulting in a situation that exceeds the linear range of the receive amplifier or causes the received signal to be less than the quantization accuracy of the analog to digital converter.
  • the antenna-based interference removal method has a vector space-based interference avoidance method.
  • the vector space-based interference avoidance is to pre-code an interference signal at a local receiving antenna (array) so that the interference signal space and the received signal space are zero space (null space:).
  • the interference avoidance method requires that the number of local receiving antennas is not less than the sum of the number of local transmitting antennas and the number of transmitting antennas of the opposite end of the communication. For example, the number of receiving antennas is 2M, and the number of transmitting antennas of the local and communication opposite ends is M.
  • Embodiments of the present invention provide a multi-antenna based signal receiving anti-interference processing method and apparatus, which can cancel out a strong interference signal received by a local receiving antenna from a local transmitting antenna.
  • a multi-antenna based signal receiving anti-interference processing method including:
  • the mixed signal and the adjusted second interference signal are subtracted to obtain a useful signal.
  • Another aspect of the embodiments of the present invention provides a multi-antenna based signal receiving anti-interference processing apparatus, including:
  • a local receiving antenna for receiving a mixed signal
  • a local reference receiving antenna for receiving a second interference signal from the local transmitting antenna, the mixed signal comprising a useful signal from the opposite transmitting antenna and a first interference signal from the local transmitting antenna;
  • a first module configured to adjust a phase and an amplitude of the second interference signal, so that the phase and the amplitude of the second signal are the same as the first signal
  • a second module configured to subtract the mixed signal and the adjusted second interference signal to obtain a useful signal.
  • the strong interference signal from the local transmitting antenna received by the local receiving antenna can be cancelled to some extent, while being retained.
  • a useful signal from the transmitting end of the communication antenna can be achieved, and at the same time, the space division multiple access technology based on the transmit antenna precoding and the communication peer receiving end is not affected.
  • FIG. 1 is a flowchart of a multi-antenna based signal receiving anti-interference processing method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a working principle of a signal receiving anti-interference processing method based on multiple antennas according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a system model of another method for receiving signal interference rejection based on multiple antennas according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a multi-antenna based signal receiving anti-interference processing device according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of another multi-antenna based signal receiving anti-interference processing apparatus according to an embodiment of the present invention.
  • the method for deleting the self-interference signal of the receiving antenna includes an analog interference deleting method, a digital interference deleting method, and an antenna-based interference deleting method.
  • the analog interference cancellation method is to subtract the local self-interference signal received by the receiving antenna by the analog interference deleting method before the analog signal formed by the transmitting channel is coupled back to the analog front end of the local receiving module through a device such as a coil.
  • a device such as a coil.
  • it is required to estimate the channel coefficient and delay of the local transmitting antenna to the receiving antenna, because the analog signal coupled from the transmitting front end needs to pass through a certain attenuator and delay, so that the signal has a certain attenuation and time delay.
  • the digital interference cancellation method is complementary to the above-mentioned analog interference cancellation method, that is, in the case that the analog interference deletion has cancelled the strong interference, the received signal is passed through the analog-to-digital converter, and then the self-interference signal is further deleted by the digital filter.
  • the pure digital domain interference removal method is more suitable for processing linear interference, but the nonlinear interference effect on the amplifier is not ideal.
  • Antenna-based interference cancellation also includes antenna spatial interference cancellation.
  • the simplest model of antenna spatial interference cancellation is based on two transmit antennas and one receive antenna set on one transceiver. The same transmit signal is transmitted on the two transmit antennas to adjust the distance between the two transmit antennas to the receive antenna. The difference is half a wavelength, so that the phase difference between the transmitted signals of the two transmitting antennas and the receiving antenna is ⁇ , so that the local transmitting signal can be inverted to cancel out.
  • This method requires two transmit antennas The amplitude is adjusted, and the amplitude of the two transmitted signals arriving at the receiving antenna is equal.
  • the antenna interference deletion is only applicable to the narrowband signal, and is sensitive to the amplitude and phase of the two transmitted signals received, and the adjustment of the amplitude and phase cannot be completely consistent with the calculation result in practice.
  • the reference antenna is used to receive the interference signal from the local transmitting antenna, and the channel reference is adjusted to adjust the amplitude and phase of the strong interference signal received by the local reference antenna from the local transmitting antenna to be received from the local receiving antenna.
  • the amplitude and phase of the strong interfering signal of the antenna are as identical as possible, and the useful signal from the transmitting antenna of the communication peer is retained by canceling the processing of the interference signal of the local transmitting antenna received by the local receiving antenna.
  • the space-division multiple access technology with the receiving end of the communication peer is not affected, and at the same time, since the reference antenna and the receiving antenna experience the same signal receiving channel (in practice, it is generally guaranteed Good channel consistency), thus avoiding complex and low-precision delay estimation problems, and achieving interference cancellation performance.
  • FIG. 1 is a flowchart of a multi-antenna based signal receiving anti-interference processing method according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a working principle of a signal receiving anti-interference processing method based on multiple antennas according to an embodiment of the present invention. As shown in FIG. 1 and FIG. 2, the multi-antenna based signal receiving anti-interference processing method includes:
  • Step 11 Receive a mixed signal, the mixed signal including a useful signal from the opposite transmitting antenna and a first interference signal from the local transmitting antenna.
  • the signal transmission mode between the local antenna and the opposite antenna is a full-duplex mode
  • a full-duplex communication terminal includes three groups of antennas, that is, a local transmitting antenna 1, a local receiving antenna 2, and a local reference receiving antenna. .
  • the local receiving antenna 2 receives the mixed signal. Specifically, the local receiving antenna 2 receives the useful signal from the transmitting end transmitting antenna 4, and the local receiving antenna 2 receives the first interference signal transmitted by the local transmitting antenna 1 through the near field coupling.
  • the first interference signal strength of the local transmitting antenna 1 received by the local receiving antenna 2 is much higher than that of the receiving transmitting antenna 4, so the first interference signal can be regarded as a strong interference signal.
  • Step 12 Receive a second interference signal from the local transmit antenna.
  • the local reference receiving antenna 3 receives the useful signal from the transmitting end transmitting antenna
  • the local reference receiving antenna 3 also receives the second interfering signal of the local transmitting antenna transmitting 1.
  • the local reference receiving antenna 3 receives the useful signal of the communication peer transmitting antenna 4 far. Less than the second interference signal that receives the local transmit antenna transmission 1.
  • L 128.1+37.61oglO(R)
  • R unit is km
  • the path loss from the terminal to the macro base station of the macro base station 200m is 102 dB
  • the path loss between the transmit antenna and the receive antenna is typically 40 dB.
  • the macro base station's transmit power is typically 43dBmw, and the terminal's transmit power is less than 30dBmw. Therefore, the self-interference of the base station is 75dB stronger than the uplink received signal. Therefore, the current research on full-duplex technology mainly focuses on how to perform self-interference deletion.
  • Step 13 Adjust the phase and amplitude of the second interference signal so that the phase and amplitude of the second signal and the first interference signal are the same.
  • the signal received by the local reference receiving antenna 3 is first passed through the amplitude and phase correction network 5, and the phase and amplitude of the second interference signal received from the local transmitting antenna 1 received by the local reference receiving antenna 3 are adjusted.
  • the second interference signal is as close as possible to the amplitude and phase of the first interference signal received by the local receiving antenna 2 from the local transmitting antenna 1.
  • Step 14 Subtract the mixed signal and the adjusted second interference signal to obtain a useful signal.
  • the mixed signal received by the local receiving antenna 2 includes a useful signal and a first interference signal, wherein the local receiving antenna 2 receives the signal from the transmitting end transmitting antenna 4 as a useful signal, and the local receiving antenna 2 receives the local transmitting antenna 1 through the near field coupling.
  • the signal is the first interference signal.
  • the mixed signal received by the local receiving antenna 2 and the adjusted second interference signal are subtracted to obtain a useful signal. That is to say, by the above interference cancellation processing, the first interference signal from the local transmitting antenna 1 received by the local receiving antenna 2 can be cancelled out, and the useful signal from the transmitting antenna 4 of the communication opposite end is retained.
  • adjusting the phase and amplitude of the second interference signal includes:
  • ⁇ is the channel matrix between the local receiving antenna 2 and the local transmitting antenna 1
  • f is A generalized inverse matrix of the channel matrix between the local reference receive antenna 3 and the local transmit antenna 1. That is to say, the phase and amplitude of the strong interference signal received from the local transmitting antenna 1 received by the local reference receiving antenna 3 are adjusted to be as strong as possible from the local transmitting antenna 1 received by the local receiving antenna 2
  • the signal amplitude and phase are the same.
  • the mixed signal and the adjusted second interference signal are subtracted in step 14.
  • ⁇ is the received signal vector of the local receiving antenna, which is the received signal vector of the local reference receiving antenna, which is the channel matrix between the local receiving antenna and the local transmitting antenna
  • f is the generalized inverse matrix of the channel matrix between the local reference receive antenna and the local transmit antenna.
  • the multi-antenna based signal receiving anti-interference processing method uses the generalized inverse matrix of the channel matrix between the local reference receiving antenna and the local transmitting antenna to adjust the local reference receiving antenna to receive the local transmitting antenna.
  • the amplitude and phase of the strong interfering signal are such that the amplitude and phase of the strong interfering signal received by the local reference receiving antenna and the local receiving antenna from the local transmitting antenna are as identical as possible.
  • the interference cancellation process the strong interference signal from the local transmitting antenna received by the local receiving antenna can be cancelled out, and the useful signal from the transmitting end transmitting antenna can be retained.
  • useful interference cancellation performance can be achieved, and at the same time, the spatial division multiple access technique based on the transmit antenna precoding and the communication peer receiving end is not affected.
  • FIG. 3 is a schematic diagram of a system model of another multi-antenna based signal receiving anti-interference processing method according to an embodiment of the present invention.
  • the multi-antenna based signal receiving anti-interference processing method includes:
  • the local transmit antenna 1 and the local receive antenna 2 and the local reference receive antenna 3 are near-field spatially coupled, and the multipath effect can be ignored because the distance is close, so the matrix is used for the non-frequency selective MIMO channel.
  • a multipath effect which is a frequency selective MIMO channel, which is represented by a matrix and a representation, respectively. If the transmitted signal vector of the local transmitting antenna 1 is x (the transmitted signal vector of the transmitting end transmitting antenna 4 is, the signal received by the local receiving antenna 2 includes the received signal of the transmitting end transmitting antenna 4 and the received signal Local transmit antenna 1 signal
  • the phase and amplitude of the signal of the reference receiving antenna 3 are adjusted so that the phase and amplitude of the signal received from the local transmitting antenna 1 received by the adjusted reference receiving antenna 3 are compared with those received by the local receiving antenna 2.
  • the amplitude and phase of the signal from the local transmit antenna 1 may be the same, and then multiplying by equation (2) to obtain equation (3):
  • J f is the generalized inverse matrix, when the local reference receiver antennas with the same local number of transmit antennas, generalized inverse matrix is the inverse matrix Common J.
  • the signal received by the local receiving antenna 2 includes two parts, the first part is related to the transmitted signal vector s(z) of the transmitting end transmitting antenna, and the second part is connected with the transmitting end transmitting antenna.
  • the transmitted signal vector is irrelevant. Therefore, the present embodiment estimates that the second portion may be related to the transmission vector of the local transmitting antenna, and thus subtracts the signal received by the local receiving antenna 2 from the second portion to obtain a useful signal received by the local receiving antenna.
  • the multi-antenna based signal receiving anti-interference processing method further includes:
  • ⁇ [ W - ® + W - (t)] obtains the useful signal from the opposite transmitting antenna received by the local receiving antenna; where n r(t) is the noise vector between the local receiving antenna and the opposite transmitting antenna , n -f (t) is the noise vector between the local reference receive antenna and the local transmit antenna.
  • the equations (1) and (2) in the above embodiment are added to the noise to obtain the equations (11) and (12):
  • the generalized inverse matrix 1 is a normal inverse matrix ⁇ /; when the number of local reference receive antennas is equal to or greater than the number of local transmit antennas, it is an estimated value of 0, , (available) instead of substituting (11) into equation (14):
  • the signal received by the local receiving antenna 2 includes three parts, the first part is related to the transmitting signal vector of the transmitting end transmitting antenna, and the second part is related to noise.
  • This embodiment estimates the third part. It may be related to the transmitted signal of the local transmitting antenna 1. Accordingly, ⁇ local signal received by the reception antenna 2 and the third portion ⁇ f ⁇ f subtracted, to obtain a useful signal of a local reception antenna
  • the useful signal y from the opposite transmitting antenna 4 can cancel out the strong interfering signal received by the local receiving antenna from the local transmitting antenna while retaining the useful signal from the transmitting end transmitting antenna.
  • the interference cancellation performance can be achieved, and at the same time, the space division multiple access technology based on the transmit antenna precoding and the communication peer receiving end is not affected.
  • the embodiment of the present invention further provides a corresponding base.
  • the multi-antenna signal receiving anti-interference processing device is shown in FIG. 4 , which is a schematic diagram of a multi-antenna based signal receiving anti-interference processing device according to an embodiment of the present invention.
  • the multi-antenna based signal receiving anti-interference processing apparatus includes a local receiving antenna 1 1 , a local reference receiving antenna 12, a first module 2, and a second module 3.
  • the local receiving antenna 11 is configured to receive the mixed signal, and the local reference receiving antenna
  • the first module 2 is configured to adjust the second interference signal The phase and amplitude are such that the phase and amplitude of the second signal are the same as the first interference signal; the second module is for subtracting the mixed signal from the adjusted second interference signal to obtain a useful signal.
  • the first module is specifically configured to:
  • the second module is specifically used to:
  • ⁇ is the received signal vector of the local receiving antenna
  • ⁇ / is the received signal vector of the local reference receiving antenna 12
  • f is a generalized inverse matrix of the channel matrix between the local reference receive antenna 12 and the local transmit antenna.
  • the embodiment of the present invention further provides a corresponding multi-antenna based signal receiving anti-interference processing device
  • FIG. 5 is another multi-antenna based signal receiving anti-analysis according to an embodiment of the present invention.
  • the multi-antenna based signal receiving anti-interference processing apparatus includes: a fourth module 4 is configured to acquire a transmit signal vector of the opposite transmit antenna, and a channel matrix ⁇ between the local receive antenna and the opposite transmit antenna.
  • the fourth module 4 of the apparatus of the foregoing embodiment is further configured to obtain a noise vector n r (t ) between the local receiving antenna and the opposite transmitting antenna, and a noise vector between the local reference receiving antenna and the local transmitting antenna 1 ⁇ f (t ); correspondingly, the fifth module 5 further configured to:
  • the formula ⁇ - J ⁇ H ⁇ ® + ( t) - obtains the useful signal y from the opposite transmitting antenna received by the local receiving antenna.
  • the signal received by the local reference antenna is adjusted by amplitude and phase, and the local reference antenna is adjusted to receive a strong interference signal from the local transmitting antenna, so that the adjusted local reference antenna receives strong from the local transmitting antenna.
  • the amplitude and phase of the interference signal are the same as the amplitude and phase of the strong interference signal received by the local receiving antenna from the local transmitting antenna.
  • the interference cancellation processing can offset the local transmitting received by the local receiving antenna to some extent.
  • the antenna's strong interfering signal retains the useful signal from the transmitting peer's transmit antenna. In turn, useful interference cancellation performance can be achieved, and at the same time, the spatial division multiple access technique based on the transmit antenna precoding and the communication peer receiving end is not affected.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)

Abstract

La présente invention concerne, dans des modes de réalisation, un dispositif et un procédé de traitement anti-interférence pour la réception de signaux sur la base de plusieurs antennes. Le procédé comprend : la réception d'un signal mixte, le signal mixte comprenant un signal souhaité par une antenne de transmission homologue et un premier signal d'interférence provenant d'une antenne de transmission locale; la réception d'un second signal d'interférence de l'antenne de transmission locale; le réglage de la phase et de l'amplitude du second signal d'interférence, de sorte que le second signal et le premier signal d'interférence aient la même phase et la même amplitude; et la soustraction du second signal d'interférence ajusté du signal mixte pour obtenir le signal souhaité. Dans des modes de réalisation de la présente invention, grâce au réglage de la phase et de l'amplitude d'une antenne de référence locale, puis à la réalisation d'une annulation de l'interférence, une antenne de réception locale peut maintenir un signal souhaité provenant d'une antenne de transmission au niveau de l'extrémité homologue de communication, réalisant ainsi une performance d'annulation d'interférence efficace, sans affecter la technologie d'accès multiple par répartition dans l'espace avec le côté de réception, au niveau de l'extrémité homologue de communication, sur la base du précodage de l'antenne de transmission.
PCT/CN2013/070208 2012-06-15 2013-01-08 Dispositif et procédé de traitement anti-interférence pour la réception de signal basés sur plusieurs antennes WO2013185481A1 (fr)

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CN201210199090.2A CN103516485B (zh) 2012-06-15 2012-06-15 基于多天线的信号接收抗干扰处理方法和装置
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CN109565754B (zh) * 2016-12-29 2021-02-23 华为技术有限公司 一种编码方法及装置
CN109347500A (zh) * 2018-11-26 2019-02-15 Oppo（重庆）智能科技有限公司 一种干扰消除方法、装置以及计算机存储介质
CN118055503A (zh) * 2019-02-01 2024-05-17 华为技术有限公司 一种通信的方法和装置
CN114204962B (zh) * 2020-09-18 2023-11-17 上海华为技术有限公司 接收信号的方法和装置
CN114336050B (zh) * 2022-03-04 2022-07-29 中国人民解放军海军工程大学 多模态场对消耦合干扰抑制方法

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