基于LDPC的编码PCM/FM系统及其性能分析  

Coded PCM-FM System Based on LDPC and Its Performances

作　　者：刘荣科[1] 高洁[1] 张晓林[1] 

机构地区：[1]北京航空航天大学电子信息工程学院,北京100083

出　　处：《遥测遥控》2006年第4期29-33,共5页Journal of Telemetry,Tracking and Command

基　　金：武器装备预研基金(51421010905HK0125);航空基础科学基金(04F51073)资助课题

摘　　要：提出一种基于低密度校验码LDPC的编码PCM/FM系统,并对该系统的性能进行分析与仿真。首先介绍接近Shannon限的先进的信道编码技术———低密度校验码(LDPC)信道纠错编码原理和解码算法,而后给出基于LDPC的编码PCM/FM系统方案,最后详细分析并仿真该系统的性能,着重比较未编码、卷积编码和LDPC编码三种系统的性能差异,还对比LDPC的各种不同参数(编码长度、校验矩阵等)对系统性能的影响。仿真表明,基于LDPC的编码PCM/FM系统具有非常优异的纠错性能,比未编码PCM-FM系统性能高出6~8 dB,适合于PCM/FM遥测系统的应用。The coded PCM-FM system based on LDPC is proposed and its performance is analyzed and simulated.Firstly the principle of LDPC encoder and decoder are introduced.Secondly the scheme of the coded PCM-FM system based on LDPC is proposed.Finally the system is simulated and its performance is analyzed.The coded PCM-FM based on convolutional codes,based on LDPC and uncoded PCM-FM are compared.The effects of different parameters,such as code length and generation matrix,were analyzed.The simulation shows that the coded PCM-FM based on LDPC is 6~8 d B better than un-coded PCM-FM.The system is very suitable for the application on telemeters.

关 键 词：低密度校验码 卷积编码 PCM/FM系统 置信传播算法 

分 类 号：TN911.2[电子电信—通信与信息系统]