摘要
提出一种利用网格编码调制将低密度校验码与高阶数字调制相结合的应用方法,其中在网格编码调制中采用递归系统卷积码进行编码用以实现基于对数似然比的软译码方法,构造了低密度校验码和网格编码调制相结合的编译码系统。仿真结果表明,该方案将低密度校验码的高编码增益与多元调制的高频谱利用率有效结合在一起,是一种功率和频谱高效的编码调制方式,比传统的网格编码方式有更好的性能。
The paper makes researches on combining trellis-coded modulation with Low Density Parity Check (LDPC) codes by using recursive systematic convolutional (RSC) codes, and presents a new LDPC coded modulation scheme, using a soft-out soft-in decoding algorithm based on Log-Likelihood Ratio (LLR). Simulation results show that this coded modulation scheme, which combines the large coding gain of LDPC codes with high bandwidth efficiency of M - QAM modulation, is power-and bandwidth-efficient.
出处
《中国有线电视》
2006年第2期149-152,共4页
China Digital Cable TV