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Adaptive suppression method for echo self-interference in broadband wireless full-duplex MIMO communication system

A broadband wireless and communication system technology, applied in transmission systems, digital transmission systems, and error prevention/detection through diversity reception, which can solve the problems of not considering the influence of non-ideal fading channel signals and high system implementation complexity

Active Publication Date: 2017-12-01
XIDIAN UNIV
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[0004] The purpose of the present invention is to provide a broadband wireless full-duplex MIMO communication system echo self-interference adaptive suppression method, aiming at solving the problem that the existing full-duplex self-interference suppression method is based on single antenna configuration and does not consider the non-ideal fading channel to signal impact, and the high complexity of system implementation

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  • Adaptive suppression method for echo self-interference in broadband wireless full-duplex MIMO communication system
  • Adaptive suppression method for echo self-interference in broadband wireless full-duplex MIMO communication system
  • Adaptive suppression method for echo self-interference in broadband wireless full-duplex MIMO communication system

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Embodiment 1

[0082] refer to figure 2 , image 3 as well as Figure 4 , the specific implementation steps of the embodiment of the present invention are as follows:

[0083]Step 1: Assume that the received signal of the near-end communication node is:

[0084]

[0085] t R (n)=H FE (n)t FE (n)+H NE (n)t NE (n)+w(n);

[0086] in, receiving signals for useful targets from remote nodes; and Transmitting signals for the near-end node itself, that is, the echo self-interference signal; Respectively represent the near-end and far-end jth (j=N 1 ,...,N T ) transmit signals on antennas; and are the channel transfer functions of the far-end and near-end transmit signals respectively; w(n) is the channel additive white Gaussian noise; where, N T Indicates the number of transmitting antennas of the communication node, N R is the number of receiving antennas, N f is the length of each frame of the signal, (·) T Represents the transpose operator symbol for a matrix or vector;...

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Abstract

The invention discloses an echo self-interference self-adaption suppression method for a broadband wireless full-duplex MIMO communication system. According to the suppression method, the iterative thought of a self-adaption filtering method is applied to an echo self-interference suppression method, accurate estimation of self-interference signals and promotion of bit error rate performance of the system are achieved through a self-adaption iterative algorithm, and non-ideal fading channel transmission conditions and multi-antenna MIMO system configuration are fully considered to put forward the echo self-interference self-adaption suppression method for the broadband wireless full-duplex MIMO communication system based on a normalized least mean square (NLMS) error algorithm. While the high-intensity self-interference signals can be suppressed significantly, the bit error rate loss of the system is effectively reduced, the transmission capacity of system channels is promoted, the implementation complexity of self-interference suppression is reduced, and the overall comprehensive performance of the wireless full-duplex system is comprehensively improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a method for self-adaptive suppression of echo self-interference in a broadband wireless full-duplex MIMO communication system. Background technique [0002] Wireless full-duplex FD communication technology has the characteristics of sending and receiving wireless signals at the same time and at the same frequency under single-channel conditions. It can solve the problem of hidden terminals in the wireless mobile network architecture and reduce network delay while efficiently utilizing limited wireless spectrum resources. It has become a hot technology in the research of the new generation wireless communication system. However, because the wireless full-duplex system transmits and receives signals at the same time and at the same frequency, the communication system not only receives useful transmission signals from other communication nodes, but also r...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06
CPCH04L1/06H04L1/0631
Inventor 王勇袁璐宫丰奎葛建华
Owner XIDIAN UNIV
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