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电子学报  2013 

一种利用软判决的信道编码识别新算法

DOI: 10.3969/j.issn.0372-2112.2013.02.015, PP. 301-306

Keywords: 信道编码识别,软判决,低信噪比,对数似然比(LLR),Walsh-Hadamard变换

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Abstract:

现有的信道编码识别方法通常利用解调输出的硬判决序列来进行,其容错能力有待提高.本文针对低信噪比的接收信号,提出了一种利用软判决的编码识别新算法.该算法基于含错方程模型,以方程成立的概率作为衡量解向量性能的量度,从而求解方程,完成识别.对数似然比(LLR)代数的使用使得算法具有简单的形式.仿真实验表明,与基于Walsh-Hadamard变换的传统算法相比,新算法提高了识别性能,且信噪比越低,性能提高越显著.

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