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Multi-antenna two-way relay evidence theory receiving method based on decode-and-forward network coding

A two-way relay, evidence theory technology, applied in the research field of cooperative communication and signal processing of multiple input multiple output system, can solve the problem of bit error performance gap and so on

Inactive Publication Date: 2016-06-01
BEIJING UNIV OF TECH
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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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  • Multi-antenna two-way relay evidence theory receiving method based on decode-and-forward network coding
  • Multi-antenna two-way relay evidence theory receiving method based on decode-and-forward network coding
  • Multi-antenna two-way relay evidence theory receiving method based on decode-and-forward network coding

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Embodiment Construction

[0064] The algorithm of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0065] The method flow chart described in the present invention is as figure 1 shown, including the following steps:

[0066] Step 1, establish a multi-antenna two-way relay system model without direct link.

[0067] 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. This 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 normalized to One becomes 1. The complex white Gaussian noise vector n has a mean o...

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Abstract

The invention discloses a multi-antenna two-way relay evidence theory receiving method based on decode-and-forward network coding. The method comprises the following steps: firstly, building a multi-antenna two-way relay model not including a direct link; and then, analyzing performance and defects of an existing multi-antenna two-way relay receiving algorithm based on the decode-and-forward network coding, and providing the multi-antenna two-way relay evidence theory receiving method based on the decode-and-forward network coding according to the defects of the existing algorithm. The method is characterized in that initial decision statistics of a received signal are acquired through a conventional multi-antenna detection method firstly; then, uncertainties generated by a fading channel and noise in the decision statistics of the received signal are described through a basic belief assignment function; the uncertainties of the decision statistics of the received signal are lowered through an evidence theory combining rule; and lastly, a reliable transmission signal is obtained through a maximum value decision criterion. Compared with an existing sub-optimal algorithm, the method has the advantages that the bit error rate performance of a relay receiving end is improved well. Lastly, simulation verification is performed on the algorithm, and a result which is consistent with theoretical analysis is obtained.

Description

technical field [0001] The invention relates to a multi-antenna two-way relay evidence theory receiving method based on decoding and forwarding network coding. Through the fusion of evidence theory and decoding and forwarding network coding, a detection algorithm for improving the bit error rate performance of a multi-antenna two-way relay receiving end is designed. , which belongs to the related field of cooperative communication and signal processing research of MIMO system. Background technique [0002] Two-way relay technology (two-way relay) is widely used as one of the keys of cooperative communication technology. It can improve the coverage area, throughput and reduce energy consumption of the communication system. The traditional single-antenna two-way relay technology requires four time slots to complete an information exchange, resulting in a decrease in spectrum efficiency. However, with the rapid development and widespread use of multiple-input multiple-output ...

Claims

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Application Information

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IPC IPC(8): H04B7/155H04B7/02H04B7/04
CPCH04B7/155H04B7/026H04B7/0413H04B7/15521
Inventor 孙艳华杨亿杨睿哲吴文君王朱伟孙恩昌司鹏搏张延华
Owner BEIJING UNIV OF TECH
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