RS码与LDPC码的联合迭代译码  

Joint Iterative Decoding for RS Codes and LDPC Codes

作　　者：贾镇泽[1] 马林华[1] 张嵩[1] 

机构地区：[1]空军工程大学航空航天工程学院,陕西西安710038

出　　处：《电视技术》2013年第17期200-203,共4页Video Engineering

基　　金：陕西省"电子信息系统综合集成"重点实验室重点基金项目(2011.ZD01;2011.02Y02)

摘　　要：针对RS码与LDPC码的串行级联结构,提出了一种基于自适应置信传播(ABP)的联合迭代译码方法。译码时,LDPC码置信传播译码器输出的软信息作为RS码ABP译码器的输入;经过一定迭代译码后,RS码译码器输出的软信息又作为LDPC译码器的输入。软输入软输出的RS译码器与LDPC译码器之间经过多次信息传递,译码性能有很大提高。码长中等的LDPC码采用这种级联方案,可以有效克服短环的影响,消除错误平层。仿真结果显示:AWGN信道下这种基于ABP的RS码与LDPC码的联合迭代译码方案可以获得约0.8 dB的增益。In this paper, an iterative joint decoding algorithm for RS codes with low density parity check codes based on adaptive belief propagation （ABP） is proposed. For the decoder, the soft output values delivered by belief propagation algorithm of LDPC codes are used as reliability values to perform ABP decoding of RS codes. And after a certain number of iterations, RS decoder also returns soft information to LDPC decoder as input. The belief message is propagated between the soft-input-soft-output RS decoder and LDPC decoder, achieving good decoding performance. This approach presents an option scheme for LDPC codes with medium length to reduce the influence of short loops and eliminate error floor effectively. Simulation result for the scheme shows that it may achieve about 0.8 dB gains over AWGN Channel.

关 键 词：RS码 LDPC码 自适应置信传播 迭代译码 串行级联 

分 类 号：TN911.22[电子电信—通信与信息系统]