| 用于CMMB的低运算复杂度LDPC解码算法 |
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| 引用本文： | 姜小波,聂正华. 用于CMMB的低运算复杂度LDPC解码算法[J]. 电子学报, 2010, 38(7): 1612-1615 |
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| 作者姓名： | 姜小波 聂正华 |
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| 作者单位： | 华南理工大学电子与信息学院,广东广州,510641;华南理工大学电子与信息学院,广东广州,510641 |
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| 摘 要： | 本文提出了两种基于变量节点可靠度的LDPC解码算法. 第一,针对传统的可靠度判决算法会产生比较严重的误判现象, 导致译码性能降低. 本文提出了一种改进的可靠度判决算法,它降低了变量节点的误判概率. 在AWGN和瑞利信道仿真中,性能都有显著的提高,性能超过了标准BP算法. 第二,提出了分层可靠度算法. 和标准BP算法相比较,性能提高了0.1dB,收敛速度提高了一倍,计算复杂度降低大约65%.
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| 关 键 词： | LDPC CMMB 分层译码 瑞利衰落信道 |
| 收稿时间： | 2009-05-27 |
| 修稿时间： | 2009-12-24 |
Low Computational Complexity Algorithms of LDPC Decoder for CMMB |
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| JIANG Xiao-bo,NIE Zheng-hua. Low Computational Complexity Algorithms of LDPC Decoder for CMMB[J]. Acta Electronica Sinica, 2010, 38(7): 1612-1615 |
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| Authors: | JIANG Xiao-bo NIE Zheng-hua |
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| Affiliation: | JIANG Xiao-bo,NIE Zheng-hua(School of Electronic and Information Engineering,South China University of Technology,Guangzhou,Guangdong 510641,China) |
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| Abstract: | In the paper,two LDPC decoding algorithms based on reliability are proposed.First,the conventional early detection method is poor performance due to misjudgment.A new early detection method is proposed,which reduces the probability of misjudgment and lead to performance improvement. At AWGN and Rayleigh fading channel simulation,the performance of the new algorithm exceed standard BP algorithm.Second,the layered reliability decoding algorithm is proposed.Compared with standard BP algorithm, the performance ... |
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| Keywords: | LDPC CMMB |
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