A linear log-MAP algorithm for turbo decoding and turbo equalization
A linear log-MAP algorithm for turbo decoding and turbo equalization
复制标题
用于Turbo解码和Turbo均衡的线性log-MAP算法
DOI：
10.1109/wimob.2005.1512836
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
M. Ahmadi
中科院分区：
文献类型：
--
作者：
S. Talakoub;L. Sabeti;B. Shahrrava;M. Ahmadi
提出了一种用于turbo解码器和turbo均衡器的log-MAP算法的简化方法。该简化算法基于log-MAP算法中使用的雅可比对数函数中对数项的MacLaurin级数展开。就复杂性而言，所提出的算法可以很容易地使用加法器和比较器来实现，就像max-log-MAP算法一样。仿真结果表明，该算法在turbo译码和turbo均衡方面的性能与log-MAP算法非常接近，即使在高损耗码间干扰（ISI）信道中，log-MAP和max log-MAP turbo均衡器的性能差距很大。
A simplification of the log-MAP algorithm for use in turbo decoders and turbo equalizers is presented. The simplified algorithm is based on the MacLaurin series expansion of the logarithmic term in the Jacobian logarithmic function used in the log-MAP algorithm. In terms of complexity the proposed algorithm can easily be implemented using adders and comparators as this is the case for the max-log-MAP algorithm. Also, simulation results show that the proposed algorithm has performance very close to the log-MAP algorithm for both turbo decoding and turbo equalization, even in a high loss intersymbol interference (ISI) channel where there is a wide gap between the performance of the log-MAP and max log-MAP turbo equalizers.