数字调幅广播中基于LDPC码的多级编码方案  

Multilevel coding scheme based on low-density parity-check codes in DAMB

作　　者：王加庆[1] 于晓燕[1] 吴乐南[1] 

机构地区：[1]东南大学无线电工程系,江苏南京210096

出　　处：《通信学报》2006年第1期85-90,共6页Journal on Communications

基　　金：国家自然科学基金资助项目(60072013)~~

摘　　要：研究了DAMB系统中基于LDPC码的多级编码方案。首先,设计了MLC分量码的码率,从而给出一种具有自适应特性的以LDPC码为分量码的多级编码方案。提出了基于可靠信息传播的多级译码方案,该方案不会造成信息丢失,且不需要重编码。构造了一组性能优异的非正则LDPC码并在DAMB信道进行了差错率仿真,结果表明基于LDPC码的MLC方案全面优于标准中RCPC/MLC方案。A multilevel coding （MLC） scheme based on LDPC codes was investigated for digital amplitude modulation broadcasting （DAMB） system. Firstly, code rates of MLC were designed, then a multistage decoding strategy was provided based on reliability information instead of only hard decisions to subsequent decoders. We also found a set of excellent irregular LDPC codes and examined the performance of them in DAMB channels. Simulations show that this scheme is more effective than the rate compatible punctured convolutional（RCPC） coded DAMB system.

关 键 词：纠错编码 LDPC码 多级编码 正交频分复用 数字调幅广播 

分 类 号：TN911.22[电子电信—通信与信息系统]