基于EXIT图的非规则LDPC码在RICE衰落信道下的优化  

Optimization of Irregular LDPC Code on RICE Fading Channel Based on EXIT Chart

作　　者：季艳中[1] 赵泽茂[1] 曹海燕[1] 

机构地区：[1]杭州电子科技大学通信工程学院

出　　处：《飞行器测控学报》2009年第6期43-46,共4页Journal of Spacecraft TT&C Technology

基　　金：国家自然科学基金委员会与中国工程物理研究院联合基金资助(10776007)

摘　　要：EXIT(Extrinsic Information Transfer)图是分析LDPC码译码收敛性的一个简单有用的工具,可以用于非规则LDPC码度分布的优化。本文介绍了EXIT图的基本原理,并将其应用于RICE衰落信道,修正了RICE信道中未知信道状态信息情况下比特节点译码器曲线计算公式,并给出了RICE信道下的度优化结果。仿真结果表明,这种方法易于实现,而且经过优化的LDPC码在衰落信道中同样获得良好的性能。EXIT(Extrinsic Information Transfer) chart is a simple and useful tool for analyzing the convergence of LDPC decoder.It can also be used for the optimization of degree distribution of irregular LDPC Codes.Firstly,this paper introduces the principle of EXIT charts;Secondly,we applied the EXIT chart to the RICE fading channels and modified the computing formula of Variable Node Decoder(VND) curve under not knowing channel state information(NCSI).A result of degree optimization is also given.The simulation result shows that the method is easy to be implemented and the LDPC codes also have a good performance after optimization.

关 键 词：EXIT 非规则LDPC码 RICE 

分 类 号：TN911.2[电子电信—通信与信息系统]