一种新的信源信道联合迭代解码  

A New Joint Source Channel Iterative Decoder

作　　者：王粤[1] 余松煜[1] 张彦昕[1] 王嘉[1] 

机构地区：[1]上海交通大学图像通信与信息处理研究所,上海200240

出　　处：《上海交通大学学报》2006年第9期1487-1491,共5页Journal of Shanghai Jiaotong University

基　　金：高校博士点专项科研基金项目(20040248047);国家自然科学基金资助项目(60202006)

摘　　要：提出了一种新的联合迭代解变长码(VLC)和低密度校验码(LDPC)的解码器.该系统主要由两个软输入和软输出(SISO)的模块组成,能利用VLC码字结构和马尔可夫信源之间的相关性来纠正误码.由于联合解码算法降低了误码率,使得LDPC的迭代次数大大减少,补偿了联合解码过程中所需要的联合信源信道变长码解码器(JVLD)的计算时间.仿真结果表明,联合迭代解码算法明显优于传统的分离解码器.A joint source channel decoder （JSCD） was proposed, which combines the variable length decoding and low density parity check （LDPC） decoding in an iterative scheme. Consisting of two soft in/soft out （SISO） modules, this JSCD decoder can exploit the source redundancy like VLC structure and correlation between the two successive Markov samples to correct errors. Furthermore, because the JSCD scheme reduces the error rate, it greatly reduces the average iterations required for LDPC decoding, thus compensates for the computation by the joint source channel variable length decoder （JVLD） which is needed in the iterative joint decoding process. The simulation results show that this iterative joint decoding scheme performs much better than that of the separate source channel decoding scheme over AWGN cb nnel.

关 键 词：联合信源信道解码 一阶马尔可夫 变长码 低密度校验码 迭代解码 白高斯噪声信道 

分 类 号：TN911[电子电信—通信与信息系统]