An acquisition method and an acquisition system for bit error rate approximate optimal decoding

Abstract

The invention is applicable to the field of communication, and provides an acquisition method of bit error rate approximate optimal decoding, which comprises the following steps: establishing a systemmodel of a three-node unidirectional relay channel, the system model comprising a source node, a relay node and a target node, and the source node sending source information to the target node through the relay node; Generating a grid structure with a special branch metric according to all possible decoding errors of the relay node and the correlation between error bits introduced by decoding ofthe relay node; And according to the grid structure, constructing a parallel product network on the target node, and calculating the source information transmitted by the source node through a BCJR algorithm and the parallel product network to obtain the bit error rate approximate optimal decoding of the source information. By means of the DF protocol-based BER approximate optimal decoding acquisition method for the convolutional code relay channel, which is disclosed by the invention, better performance can be realized in different relay channel scenes compared with an existing decoding algorithm.

Description

technical field [0001] The invention belongs to the field of communication, and in particular relates to an acquisition method for approximately optimal decoding of a bit error rate. Background technique [0002] As an outstanding transmission strategy, relay-assisted communication has become a research hotspot, and its basic idea is to deploy one or more relay nodes to expand the coverage of the signal sent by the source node. Among the many known relay protocols, the most widely studied are the Amplify-and-forward (AF) and Decode-and-Forward (DF) protocols. As one of the most classic and practical relay protocols to eliminate the effects of noise and other channel impairments, DF has important research significance. In this protocol, the relay node fully decodes, re-encodes, and retransmits the source node's information. However, the implementation of the traditional DF protocol faces two problems. [0003] First, the traditional maximum ratio combination scheme applied...

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Problems solved by technology

[0004] Furthermore, the complexity of known optimal decoding algorithms for BER / BLER is exponentially related to the length of the message block, and even for some unencoded systems, the implementation of these algorithms is very complex

Therefore, in the imperfect link from the source node to the relay node, an approximately optimal decoding algorithm that is superior to all traditional decoders should have the ability to effectively estimate the probability of different relay decoding scenarios, which also becomes The research focus in the field of relay-assisted communication, but in the prior art, there is no method for obtaining the approximate optimal decoding of the bit error rate that can effectively estimate the probability of different relay decoding scenarios

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