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Active echo self-interference suppression method for wireless broadband multi-antenna mimo full-duplex system

An echo interference, full-duplex technology, applied in diversity/multi-antenna systems, radio transmission systems, baseband systems, etc., can solve the problem of unsatisfactory suppression performance, not considering the impact of BER performance of non-ideal fading channel systems, etc. question

Active Publication Date: 2018-02-13
XIDIAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide an active MIMO wireless full-duplex system echo interference suppression method, aiming at solving the problem that most existing full-duplex echo self-interference suppression methods are based on single-antenna SISO configuration and do not consider non-ideal fading The influence of the channel on the performance of the bit error rate of the system and other defects, as well as the problem that the traditional passive self-interference suppression method is simple to implement and the suppression performance is not ideal

Method used

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  • Active echo self-interference suppression method for wireless broadband multi-antenna mimo full-duplex system
  • Active echo self-interference suppression method for wireless broadband multi-antenna mimo full-duplex system
  • Active echo self-interference suppression method for wireless broadband multi-antenna mimo full-duplex system

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[0103] refer to figure 2 , the specific implementation steps of the present invention are as follows:

[0104] Step 1: At the sending end of the near-end node and the remote node, first send a signal to the near-end, that is, the echo self-interference signal and the useful target signal sent by the remote space vector and Get the actual near-end transmitted signal and far-end transmitted signal β(θ n )t NE (n) and α(θ f )t FE (n), where θ n and θ f are the transmission angles of the near-end signal and the far-end signal, respectively;

[0105] by the following formula and image 3 The derivation of can get the space vector:

[0106] and expression for:

[0107]

[0108]

[0109] The near-end receives the transmitted signal from the far-end antenna with an incident angle of θ f , the incident angle of the interference signal received from the near end is θ n , d is the spacing between adjacent antennas (generally selected as half of the wavelength...

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Abstract

The invention discloses an active echo self-interference suppression scheme of a wireless broadband multi-antenna MIMO full-duplex system. A wave beam forming technology and self-adaption iteration filtering processing are applied to a full-duplex self-interference suppression method, pre-weighting processing is carried out all paths of emitting signals on a sending side through airspace wave beam forming, and echo self-interference signals are accurately estimated and eliminated on a receiving side through repeated iteration of a self-adaptive filtering algorithm. An FD-MIMO system frame is introduced through an airspace wave beam forming method, the broadband wireless FD-MIMO system echo self-interference suppression scheme combined with an active suppression mechanism is provided, the high self-interference signals of the full-duplex (FD) system are suppressed obviously, meanwhile, the bit error rate (BER) performance of the system is effectively controlled, the channel transmission capacity of the system is comprehensively improved, and the overall performance of the full-duplex system is improved. Under the condition of a fading channel, the bit error rate (BER) and system capacity of the full-duplex system under an existing ideal channel can be achieved, and the scheme can be used for various new-generation broadband wireless full-duplex communication systems.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an active echo self-interference suppression method for a wireless broadband multi-antenna MIMO full-duplex system. Background technique [0002] Compared with the traditional time division duplex TDD and frequency division duplex FDD systems, the wireless full duplex FD system has the characteristics of sending and receiving signals at the same time and at the same frequency under single channel conditions, which can more efficiently use the increasingly tight wireless spectrum resources Therefore, it has become a key popular technology for the evolution of the new generation mobile communication system and wireless personal area network system architecture and standards. [0003] However, due to the fact that the full-duplex FD system transmits and receives signals at the same frequency at the same time, the full-duplex FD communication system has a v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04B7/06H04L1/06H04L25/02
CPCH04B7/0413H04B7/068H04B7/0848H04L1/06H04L25/03006
Inventor 王勇袁璐宫丰奎葛建华
Owner XIDIAN UNIV
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