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电子学报  2014 

卷积码基于逃逸机制的次优译码

DOI: 10.3969/j.issn.0372-2112.2014.04.032, PP. 828-832

Keywords: 卷积码,维特比算法,M算法,蔡氏译码,逃逸机制

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Abstract:

本文借助降排序、动态选择器和矢量寄存器等模块,提出了一种卷积码M算法的矩阵实现方案,设计了一种具有并行处理能力的单一结构译码器.M算法容易陷入次优的局部搜索区域,本文利用快检卷积码的快检特性,结合低密度校验码的核加运算和蔡氏算法的最近邻域扩展思想,建立了一种低开销的逃逸机制,帮助译码器快速摆脱局部最优解.仿真实验表明,基于逃逸机制的改进算法可获得约0.8db的额外增益,充分证明了算法的可行性和有效性.

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