摘要
为改善空间耦合低密度奇偶校验码在块衰落信道下的性能,基于空间耦合低密度奇偶校验码的原模图结构特性,提出一种能够实现满分集的串联多链空间耦合低密度奇偶校验码集。该码集通过交换各子链相同位置上变量节点的边连接将多条子链进行耦合,使不同衰落块之间具有强相关性,从而能有效地避免由于信道深衰落引起的中断。根据原模图外信息转移算法,分析了该码集的无限长性能,并进一步通过置信传播译码算法得到该码集的有限长性能。仿真结果表明,所提出的串联多链空间耦合低密度奇偶校验码集能够有效地提升空间耦合低密度奇偶校验码在块衰落信道下的性能。
To improve the performance of spatially coupled low density parity check(SC-LDPC)codes over block-fading channels,a serial connecting multi-SC-LDPC(SC-MSC-LDPC)codes is proposed based on the structure characteristics of the SC-LDPC codes,which can lead to full diversity.By exchanging the edge connections of variable nodes at the same location of each subchain,multiple subchains are coupled to form the codes with a strong correlation between different fading blocks,which can effectively avoid the outage occurrence caused by deep fading blocks.The infinite-length performance is analyzed by utilizing the protograph-based extrinsic information transfer(PEXIT)algorithm.Furthermore,the finite-length performance is obtained via belief propagation(BP)decoding.Simulation results show that the proposed SC-MSC-LDPC codes improve the performance of SC-LDPC codes over the block-fading channels.
作者
孙岳
李蓓蕾
梁彩虹
李颖
SUN Yue;LI Beilei;LIANG Caihong;LI Ying(State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an 710071, China)
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2019年第2期1-5,28,共6页
Journal of Xidian University
基金
国家自然科学基金(61671345
61671340)
关键词
块衰落信道
空间耦合低密度奇偶校验码
原模图外信息转移
置信传播
block-fading channels
spatially coupled LDPC codes
protograph-based extrinsic information transfer
belief propagation
