北斗系统BCH码的低复杂度软判决译码算法  

Low-complexity Soft-Decision Decoding Algorithm for BCH Code in BeiDou System

作　　者：曲国伟[1] 邓松峰 

机构地区：[1]烟台南山学院,烟台265713 [2]航天电子技术研究所,上海201109

出　　处：《系统仿真学报》2016年第8期1790-1794,共5页Journal of System Simulation

摘　　要：对于北斗卫星导航系统中使用的BCH(15,11)码,提出了一种基于重编码的低复杂度软判决译码算法。该算法在检测到硬判决结果包含错误时,根据软判决向量构造若干备选信息序列,并对每个信息序列进行重新编码,与接收软判决向量进行相关,选择最大相关值的码字作为译码结果。仿真结果表明,该算法相对于传统的硬判决译码算法的复杂度增加不高,但是纠错性能相有了很大提升,并且避免了纠错ROM信号的存储,因此是实际导航接收机译码算法的良好选择。A low-complexity soft-decision decoding algorithm based on the re-encoding technique was proposed for the BCH（15,1 l） code in BeiDou satellite navigation system. Several candidate information sequences were constructed by the soft-decision vector and then re-encoded in the algorithm if the error in the hard-decision result was detected. The correlation between each codeword and the soft-decision vector was calculated, and the codeword with the maximum correlation value was selected as decoding output. Simulation results show that the presented algorithm outperforms traditional hard-decision decoding at the expense of moderate complexity increase. Moreover, the storage of error-correction ROM signal is avoided. Hence, the presented algorithm is a good choice for decoding in a practical navigation receiver.

关 键 词：北斗 BCH码 软判决译码 重编码 

分 类 号：TN967.1[电子电信—信号与信息处理]