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基于信噪比的变门限大数逻辑译码
引用本文:钱璟,曹志刚.基于信噪比的变门限大数逻辑译码[J].清华大学学报(自然科学版),2009(7).
作者姓名:钱璟  曹志刚
作者单位:清华大学电子工程系;微波与数字通信技术国家重点实验室;
摘    要:日本数字电视ISDB标准中采用的是(273,191)差集循环码,采用改进的变门限大数逻辑译码,但这种方法在信噪比较低时具有较高的译码误指示率。为改善译码性能,该文基于(273,191)差集循环码分析了产生这种缺陷的原因,提出了一种基于信噪比的变门限大数逻辑译码方法,并对其进行了仿真比较。结果表明,改进后的算法在中低信噪比时以少量的性能损失大幅降低了更为重要的误指示率。

关 键 词:差集循环码  大数逻辑译码  变门限大数逻辑译码  译码成功误指示率  

Variable-threshold majority-logic decoding based on the SNR
QIAN Jing,CAO Zhigang.Variable-threshold majority-logic decoding based on the SNR[J].Journal of Tsinghua University(Science and Technology),2009(7).
Authors:QIAN Jing  CAO Zhigang
Institution:State Key Laboratory of Microwave and Digital Communication;Department of Electronic Engineering;Tsinghua University;Beijing 100084;China
Abstract:The(273,191) difference-set cyclic code adopted in the Japanese ISDB standard uses the variable threshold majority-logic algorithm for decoding,but the erroneous indication rate of successfully decoded words can be quite high at low SNR.This paper describes an improved SNR-based variable threshold algorithm to improve the decoding performance.This algorithm significantly reduces the indication rate error at low SNR with only a small performance loss as shown in simulations.
Keywords:difference-set cyclic code  majority-logic decoding  variable threshold majority-logic decoding  wrong indication rate  
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