| 基于LDPC的编码PCM/FM系统及其性能分析 |
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| 作者姓名： | 刘荣科 高洁 张晓林 |
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| 作者单位： | 北京航空航天大学电子信息工程学院 北京100083 |
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| 基金项目： | 武器装备预研基金(51421010905HK0125)，航空基础科学基金(04F51073)资助课题 |
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| 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。
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| 关 键 词： | 低密度校验码 卷积编码 PCM/FM系统 置信传播算法 |
Coded PCM-FM System Based on LDPC and Its Performances |
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| Authors: | Liu Rongke Gao Jie Zhang Xiaolin |
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| Abstract: | 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. |
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| Keywords: | Low-Density Parity-Check Codes Convolutional Codes PCM-FM system BP algorithm |
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