一种改进的LDPC编码调制系统解调译码方案  

An Improved Demodulation and Decoding Program for LDPC Coded Modulation Systems

作　　者：沐士光[1] 张玉忠[1] 

机构地区：[1]玉溪师范学院信息技术工程学院,云南玉溪653100

出　　处：《玉溪师范学院学报》2010年第8期38-42,共5页Journal of Yuxi Normal University

摘　　要：目前,比特交织编码调制及迭代译码(BICM-ID)常采用的解调译码方案是把接收端译码器输出的软信息反馈回解调器作为先验信息并将其进行迭代处理来完成译码,但这往往会导致码字间的最小欧氏距离的减少,致使系统在非衰落的高斯信道下性能的下降.为此,提出了一种改进的迭代解调译码方案,并对其进行了仿真分析.从分析结果看,该方案在保证系统复杂度基本不变的前提下,可以提高LDPC编码的BICM-ID系统的译码性能.At present,in bit-inerleaved coded modulation and iterative decoding(BICM-ID),decoding is often conducted through the iteration of the soft information from the decoder of the receiving end,which is fed back to the demodulator as priori information.This scheme tends to lead the reduction of the minimum codeword Euclidean distance,resulting in the degradation in the performance of the system at non-Gaussian fading channel.To improve the situation,this paper presented an improved iterative demodulation and decoding program.The simulation analysis shows that the program can improve the decoding performance of LDPC coded BICM-ID system without changing the complexity of the system.

关 键 词：低密度奇偶校验码 比特交织编码调制 迭代解调译码 

分 类 号：TN91[电子电信—通信与信息系统]