用于Turbo迭代译码的log-MAP算法的简化

刘东华; 唐朝京

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用于Turbo迭代译码的log-MAP算法的简化

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- 文章访问数: 2549
- HTML全文浏览量: 127
- PDF下载量: 574
- 被引次数: 0
出版历程
- 收稿日期: 2000-06-05
- 修回日期: 2001-01-22
- 刊出日期: 2001-12-19

SIMPLIFICATION OF LOG-MAP ALGORITHM USED FOR TURBO ITERATIVE DECODING

摘要

摘要: 对用于Turbo迭代译码的对数最大后验概率(log-MAP)译码算法进行了分析和推导。根据Turbo编译码特点以及对格图中分支路径量度特性的分析,得到了简化分支路径量度和外部信息计算的方法。并就log-MAP算法中形如ln(ex+ey)的计算作了分析和化简,进一步减小log-MAP算法的复杂性。最后给出仿真结果并进行了分析。
- Turbo码; log-MAP算法; 迭代译码; 外部信息
Abstract: In this paper, logarithm MAP algorithm used for turbo iterative decoding is analyzed and deduced. Based on the characteristic of turbo coding and decoding and the analysis of branch metric in the trellis, methods of simplifying computation of branch metric and extrinsic information are obtained. And then it is done with the computation of ln(ex+ey) in the log-MAP algorithm to further simplify the complexity of log-MAP. Finally, simulation results and analysis are carried out.

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参考文献(1)

C. Berrou.[J].A. Glavieux, P. Thitimajshima, Near Shannon limit error correcting coding and decoding: Turbo-codes(1), In ICC93, Geneva, Switzerland, May.1993,:-[2]S. Benedetto, D. Divsalar, G. Montorsi, F. Pollara, Soft-output decoding algorithms in iterative decoding of turbo codes, TDA Progress Report 42-119, February, 1996, 63-87.[3]L.R. Bahl, J. Cocke, F. Jeinek, J. Raviv, Optimal decoding of linear codes for minimizing symbol error rate, IEEE Trans. on IT, 1974, IT-20(3), 248-287.[4]S. Benedetto, D. Divsalar, G. Montorsi, F. Pollara, A soft-input soft-output maximum a posteriori(MAP) module to decode parallel and serial concatenated codes, TDA Progress Report 42-127,November 1996, 1-20.[5]P. Robertson.[J].E. Villebrum, P. Hoeher, A comparison of optimal and sub-optimal MAP decoding algorithms operating in the log domain, In ICC95, Seattle, Washington, June.1009,1995:-

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文章访问数: 2549
HTML全文浏览量: 127
PDF下载量: 574
被引次数: 0

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用于Turbo迭代译码的log-MAP算法的简化

计量

出版历程

SIMPLIFICATION OF LOG-MAP ALGORITHM USED FOR TURBO ITERATIVE DECODING

计量

出版历程

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