DVB-S2标准IRA-LDPC译码算法研究与改进  

Research and Improvement on IRA-LDPC Decoding Algorithm in DVB-S2

作　　者：黄秋元[1] 陈兵 龙必起 俞丽娜 

机构地区：[1]武汉理工大学信息学院,湖北武汉430070 [2]上海明波通信技术有限公司,上海201203

出　　处：《电视技术》2009年第S2期47-50,共4页Video Engineering

摘　　要：首先对DVB-S2标准LDPC码编码原理、IRA码以及校验矩阵的特征进行了分析,接着对该标准中LDPC码的Tanner图参数进行了总结,然后对不同的译码算法从性能和复杂度方面进行了比较,并且对不同迭代次数时LDPC码的判决信息的分布进行了分析,最后对各种译码算法的性能和复杂度进行了总结。仿真结果表明,SPA译码算法性能最优但是复杂度最大,MinSum算法的复杂度最低但是性能最差,而改进的MinSum算法则在复杂度和性能方面是前面两种算法的折中,对实际工程的应用有较强的借鉴作用。The encoding principle,the characteristics of IRA code and parity check metrics of LDPC in DVB-S2 are analyzed in this paper firstly,and the parameters of Tanner graph of LDPC in the standard are summarized.Then the performance and complexity of different decoding algorithms are compared and the distribution of decision information in LDPC of different iterations are analyzed.Finally the performance and complexity of different decoding algorithm are summarized.According to the simulation results,the SPA decoding algorithm performs best with the most complexity,the MinSum decoding algorithm performs worst with the least complexity,the modified MinSum decoding algorithm performs modest between the former two algorithms,it can be used in the actual project.

关 键 词：低密度校验码 DVB-S2 IRA码 MinSum算法 SPA算法 

分 类 号：TN911.2[电子电信—通信与信息系统]