Full diversity multi-antenna two-way relay receiving method based on combination of Dempster-Shafer evidence theory and physical-layer network coding

A technology of network coding and evidence theory, applied in the research field of cooperative communication and signal processing of multiple-input multiple-output systems, which can solve problems such as bit error performance gap

Inactive Publication Date: 2015-11-11
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the PNC-based LLR combining algorithm still has a large gap in bit error performance compared with the ML receiving algorithm based on decode-and-forward network coding.

Method used

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  • Full diversity multi-antenna two-way relay receiving method based on combination of Dempster-Shafer evidence theory and physical-layer network coding
  • Full diversity multi-antenna two-way relay receiving method based on combination of Dempster-Shafer evidence theory and physical-layer network coding
  • Full diversity multi-antenna two-way relay receiving method based on combination of Dempster-Shafer evidence theory and physical-layer network coding

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Embodiment Construction

[0059] The algorithm of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0060] The method flow chart described in the present invention is as figure 1 shown, including the following steps:

[0061] Step 1, establish a multi-antenna two-way relay system model without direct link.

[0062] Create a network consisting of two single-antenna users and one containing n R = Two-way relays with 2 antennas form an uncoded equivalent virtual MIMO model such as figure 2 shown. The model can be expressed as: Y=HX+N. The elements of the channel matrix H are modeled as independent and identically distributed complex Gaussian random variables with a mean of 0 and a variance of 1; the transmission vector X is obtained by BPSK or QPSK modulation of a randomly generated 0 and 1 bit stream, and the energy of the transmitting antenna is returned to One becomes 1. The complex Gaussian white noise vector N has a mean of 0...

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Abstract

The invention discloses a full diversity multi-antenna two-way relay receiving method based on combination of a Dempster-Shafer evidence theory and a physical-layer network coding. Firstly, a multi-antenna two-way relay model without direct link is built; then, performance and defects of the prior multi-antenna two-way relay receiving algorithm based on a decode-and-forward network coding and the physical-layer network coding are analyzed, moreover, according to the defects of the prior algorithm, the full diversity multi-antenna two-way relay receiving method based on combination of the Dempster-Shafer evidence theory and the physical-layer network coding is provided. According to the invention, uncertainty generated by fading channels and noise is described through a basic probability assignment function, then, the uncertainty of received signals is reduced at a receiving end through a Dempster's rule, and finally, reliable transmission signals are obtained through a maximum judgement rule. As compared with the prior sub-optimal algorithm, the method provided by the invention improves bit error rate performance of a relay receiving end well, and simultaneously achieves full diversity gain at the receiving end. Finally, the provided algorithm is subjected to simulation verification, and the result of simulation verification is consistent with theoretical analysis.

Description

technical field [0001] The invention relates to a full-diversity multi-antenna two-way relay receiving method based on the combination of evidence theory and physical layer network coding. Through the fusion of evidence theory and physical layer network coding, a method for improving the bit error rate of the multi-antenna two-way relay receiving end is designed. The performance detection algorithm belongs to the related field of cooperative communication and signal processing research of MIMO system. Background technique [0002] The two-way relay cooperative communication technology (two-way relay) can improve the coverage area, throughput and reduce energy consumption of the communication system. However, the traditional two-way relay system needs four time slots to complete an information exchange, resulting in a decrease in spectrum efficiency. In order to improve the spectrum utilization of two-way relay cooperative communication technology, a two-way relay system bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/155H04L1/00H04L25/06H04B7/04
CPCH04B7/0413H04B7/155H04B7/15521H04L1/0076H04L25/067
Inventor 孙艳华杨亿杨睿哲孙恩昌司鹏搏张延华
Owner BEIJING UNIV OF TECH
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