| LDPC码译码算法及性能分析 |
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| 引用本文： | 李秀花,高永安,马雯.LDPC码译码算法及性能分析[J].现代电子技术,2014(1):1-4. |
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| 作者姓名： | 李秀花 高永安 马雯 |
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| 作者单位： | [1]杭州电子科技大学电子信息学院,浙江杭州310018 [2]中国电子科技集团公司第五十研究所,上海200331 |
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| 基金项目： | 国家国防科工局科研项目（B12020090） |
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| 摘 要： | 为了进一步降低低密度奇偶校验(LDPC)码译码算法的复杂度,基于经典置信传播(BP)译码算法,给出了对数域迭代后验概率对数似然比(APP LLR)算法。通过概率域的和积算法(SPA)和对数域的迭代APP LLR算法的性能仿真及分析可见,迭代APP LLR算法能以较小的性能损失换取复杂度的大幅降低。进一步选用迭代APP LLR算法,结合不同地形条件下的VHF频段信道模型,仿真了LDPC码编译码系统的性能。理论分析及仿真结果均表明,基于迭代APP LLR算法的LDPC码,实现简单,性能优异,具有良好的工程应用前景。
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| 关 键 词： | LDPC码 迭代APP LLR 和积算法 VHF频段 |
Decoding algorithm and performance analysis of LDPC codes |
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| LI Xiu-hua,GAO Yong-an,MA Wen.Decoding algorithm and performance analysis of LDPC codes[J].Modern Electronic Technique,2014(1):1-4. |
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| Authors: | LI Xiu-hua GAO Yong-an MA Wen |
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| Affiliation: | 1. School of Electronics Information, Hangzhou Dianzi University, Hangzhou 310018, China 2. No.50 Research Institute of China Electronics Technology Group Corporation, Shanghai 200331, China) |
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| Abstract: | In order to further reduce the decoding algorithm complexity of low density parity check code （LDPC）, a posteri- ori probability log likelihood ratio （APP LLR） algorithm in the log domain is given, which is based on the classical belief propa- gation （BP） decoding algorithm. Through the performance simulation and analysis of sum product algorithm （SPA） in the proba- bility domain and iterative APP LLR algorithm in the log domain, it is shown that the iterative APP LLR algorithm could exchange a large reduce in complexity with less performance loss. By using iterative APP LLR algorithm, in combination with VHF band channel model in different terrain conditions, the performance of LDPC encode and decode system is simulated. Theoretical analysis and simulation results show that the LDPC code based on iterative APP LLR algorithm is easy to realize and has excellent performance and good prospect of engineering application. |
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| Keywords: | LDPC code iterative APP LLR SPA VHF band |
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