| 基于TCM的LDPC高效编码调制系统性能 |
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| 引用本文： | 张昊,倪卫明. 基于TCM的LDPC高效编码调制系统性能[J]. 太赫兹科学与电子信息学报, 2008, 6(2): 92-96 |
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| 作者姓名： | 张昊 倪卫明 |
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| 作者单位： | 复旦大学,信息科学学院,上海,200433 |
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| 摘 要： | 为了缓解频带有效性与功率有效性的矛盾,提出了将低密度校验码与网格编码调制相结合的系统方案,其中在网格编码调制中采用了递归系统卷积码进行编码,以实现基于对数似然比的软译码方法,以此构造低密度校验码与网格编码调制相结合的编译码系统。分析了该系统在加性高斯白噪声干扰和瑞利信道下的性能和信道信息对于系统性能的影响。仿真结果表明,该系统能够有效地在频谱利用率和码字性能之间达到折衷,可以在一定程度上缓解矛盾。
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| 关 键 词： | 低密度校验码 对数似然比 软译码解调 网格编码调制 瑞利衰落信道 信道信息 |
| 文章编号： | 1672-2892(2008)02-0092-05 |
| 修稿时间： | 2007-10-22 |
Performance Analysis of High Frequency Efficiency Scheme Integrated with LDPC Codes and Trellis-Coded Modulation |
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| ZHANG Hao,NI Wei-ming. Performance Analysis of High Frequency Efficiency Scheme Integrated with LDPC Codes and Trellis-Coded Modulation[J]. Journal of Terahertz Science and Electronic Information Technology, 2008, 6(2): 92-96 |
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| Authors: | ZHANG Hao NI Wei-ming |
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| Abstract: | This paper designs and analyzes a system scheme integrated with Trellis-Coded Modulation(TCM) and Low Density Parity Check(LDPC).It uses Recursive Systematic Convolutional(RSC) codes to make a TCM function to carry out soft decoding method based on Log-Likelihood ratio.This paper studies the performance of this system on Additive White Gaussian Noise(AWGN) channel and Rayleigh channel.It analyzes the effect of Channel State Information(CSI) on the performance.The results indicate that this system can make more use of frequency channel.In modern mobile communication system,this scheme can compromise the conflict between the efficiency of frequency and the efficiency of power in a way. |
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| Keywords: | LDPC codes Log-Likelihood ratio soft-decoding and demodulation Trellis-Coded Modulation Rayleigh channel Channel State Information |
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