基于DTMB中LDPC码与BCH码的乘积码构造  

Construction of Product Codes Based on LDPC Codes and BCH Codes in DTMB

作　　者：陈为刚[1] 冯秀川[1] 梁晨驰[1] 邵亚东[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《电视技术》2014年第7期127-129,163,共4页Video Engineering

基　　金：国家自然科学基金项目(61101114);教育部新世纪优秀人才支持计划项目(NCET-12-0401);天津市自然科学基金项目(11JCYBJC00400);天津市科技兴海项目(KJXH2011-2)

摘　　要：中国地面数字电视传输(DTMB)标准中的级联码能够有效降低低密度奇偶校验(Low-Density Parity-Check,LDPC)码的误码平层以获得极低的误比特率。基于DTMB标准中LDPC码与BCH码提出了一种性能优越的乘积码构造方案。构造的乘积码不仅性能优于级联码而且编译码复杂度与级联码相当,代价是较大的译码延时与较大的存储量。仿真结果表明,在码率相同且误比特率为1×10-7时,与级联码相比,构造的码长最长的乘积码可获得约0.12 dB的编码增益。Concatenated codes of Digital Terrestrial Multimedia Broadcast （DTMB） can reduce the error floor of Low-Density Parity-Check （LDPC） codes effectively to achieve ultra low bit error rate. A scheme of product codes with high performance is proposed based on the same LDPC codes and BCH codes in DTMB. The constructed product cedes not only outperform the concatenated cedes but also the complexity of the product codes is comparable to the concat- enated codes, but need longer decoding delay and larger storage capacity. The simulation results show that compared to concatenated codes with the same rate, the constructed product codes with the longest code length can achieve about 0.12 dB coding gain when the bit error rate is 1 ×10^-7.

关 键 词：DTMB 级联码 乘积码 

分 类 号：TN911.22[电子电信—通信与信息系统]