块衰落信道下串联多链空间耦合LDPC码设计

doi:10.19665/j.issn1001-2400.2019.02.001

西安电子科技大学学报 ›› 2019, Vol. 46 ›› Issue (2): 1-5.doi: 10.19665/j.issn1001-2400.2019.02.001

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块衰落信道下串联多链空间耦合LDPC码设计

孙岳,李蓓蕾,梁彩虹,李颖

西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安 710071

收稿日期:2018-09-17 出版日期:2019-04-20 发布日期:2019-04-20
作者简介:孙岳(1979-),男,副教授,E-mail:ysun@mail.xidian.edu.cn
基金资助:
国家自然科学基金(61671345);国家自然科学基金(61671340)

Design of serial connecting multiple spatially coupled LDPC codes for block-fading channels

SUN Yue,LI Beilei,LIANG Caihong,LI Ying

State Key Lab. of Integrated Service Networks, Xidian Univ., Xi’an 710071, China

Received:2018-09-17 Online:2019-04-20 Published:2019-04-20

摘要/Abstract

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。

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

Abstract:

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.

Key words: block-fading channels, spatially coupled LDPC codes, protograph-based extrinsic information transfer, belief propagation

中图分类号:

TN911.22

孙岳,李蓓蕾,梁彩虹,李颖. 块衰落信道下串联多链空间耦合LDPC码设计[J]. 西安电子科技大学学报, 2019, 46(2): 1-5.

SUN Yue,LI Beilei,LIANG Caihong,LI Ying. Design of serial connecting multiple spatially coupled LDPC codes for block-fading channels[J]. Journal of Xidian University, 2019, 46(2): 1-5.

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参考文献 9

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块衰落信道下串联多链空间耦合LDPC码设计

Design of serial connecting multiple spatially coupled LDPC codes for block-fading channels

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