基于低密度格码的编码协作中继系统

发布时间：2018-04-17 10:52

本文选题：低密度格码 + 编码协作　；参考：《系统工程与电子技术》2017年05期

【摘要】：提出一种联合低密度奇偶校验码(low density parity check,LDPC)的低密度格码编码协作(low density lattice code coded cooperation,LDLC-CC)改进方案。中继对源节点广播的LDLC码字进行译码,并向目的节点转发基于LDPC和LDLC编码的增强校验信息。通过利用校验矩阵下三角结构特性,源节点和中继节点可以简单地通过各自的校验矩阵进行整形和编码,且采用的LDLC校验矩阵可以构成高维下三角结构校验矩阵。此外,设计了目的节点联合迭代软译码算法。该算法建立了LDLC联合译码与LDPC软译码之间的联系,相比LDPC硬译码可以获得显著的编码增益。仿真结果显示,在瑞利慢衰落信道下提出的联合LDPC的LDLC-CC系统相比传统无协作直传LDLC系统最大可以取得近5dB性能增益。
[Abstract]:An improved scheme for low density trellis coding, low density lattice code coded cooperation (LDLC-CCS), is proposed, which combines low density parity LDPCs with low density parity check codes (LDPCs).The relay decodes the LDLC codewords broadcast by the source node and forwards the enhanced check information based on LDPC and LDLC codes to the destination node.By using the triangulation characteristic of the check matrix, the source node and the relay node can be simply shaped and coded by their respective check matrices, and the LDLC check matrix can be used to form the high dimensional lower triangular structure check matrix.In addition, a joint iterative soft decoding algorithm for destination nodes is designed.This algorithm establishes the relationship between LDLC joint decoding and LDPC soft decoding, and can obtain significant coding gain compared with LDPC hard decoding.The simulation results show that the proposed LDLC-CC system with LDPC in Rayleigh slow fading channel can achieve the maximum performance gain of near 5dB compared with the traditional non-cooperative direct LDLC system.
【作者单位】：北京邮电大学信息与通信工程学院;
【基金】：中央高校基本科研业务费专项资金(500401180) 北京邮电大学2014年优秀博士研究生创新基金(CX201426)资助课题
【分类号】：TN911.22

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