西安电子科技大学学报

• 研究论文 •    下一篇

适用于突发删除信道的非对称空间耦合LDPC码

张昭基;李颖   

  1. (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:2016-10-13 出版日期:2017-10-20 发布日期:2017-11-29
  • 作者简介:张昭基(1992-),男,西安电子科技大学博士研究生,E-mail:zjzhang_1@stu.xidian.edu.cn
  • 基金资助:

    国家自然科学基金资助项目(61671345)

Asymmetric spatially-coupled LDPC codes for burst erasure channels

ZHANG Zhaoji;LI Ying   

  1. (State Key Lab. of Integrated Service Networks, Xidian Univ., Xi'an 710071, China)
  • Received:2016-10-13 Online:2017-10-20 Published:2017-11-29

摘要:

空间耦合低密度奇偶校验码在有记忆信道下的性能易受突发删除的影响.为改善空间耦合低密度奇偶校验码在突发删除信道下的性能,提出一种非对称空间耦合结构,该结构允许空间耦合低密度奇偶校验码的原模图中同一位置上的变量节点采用不同的耦合宽度进行耦合.根据所设计的非对称空间耦合低密度奇偶校验码的特点,分析了其基矩阵的停止集.结果显示,与原始空间耦合低密度奇偶校验码相比,非对称空间耦合低密度奇偶校验码的基矩阵不仅具有更大的跨度,还具有更大的最小停止集.因而,非对称空间耦合低密度奇偶校验码可以纠正更长的单突发删除或者更多的多突发删除.仿真结果表明,所提出的非对称空间耦合低密度奇偶校验码能够有效提升原始空间耦合低密度奇偶校验码在单突发删除信道和多突发删除信道下的性能.

关键词: 低密度奇偶校验码, 非对称空间耦合, 突发删除信道

Abstract:

The outstanding performance of Spatially-Coupled Low Density Parity Check(SC-LDPC) codes deteriorates due to burst erasures over the channels with memory. To improve the performance of SC-LDPC codes over burst erasure channels, an asymmetric spatial coupling structure is proposed where the variable nodes at the same position of the protograph are permitted to couple with check nodes with different coupling widths. According to the structural properties of the Asymmetric Spatially-Coupled LDPC (ASC-LDPC) codes, the characteristics of the stopping sets of the base matrices are analyzed. It is shown that the base matrix of an ASC-LDPC code possesses a longer span and a larger cardinality of the minimal stopping set than that of the conventional SC-LDPC code. Thus a longer single-burst erasure or more multiple-burst erasures can be corrected by ASC-LDPC codes. Simulation results show that the proposed asymmetric spatial coupling structure could improve the performance of SC-LDPC codes over both the single-burst erasure channels and multiple-burst erasure channels.

Key words: low density parity check codes, asymmetric spatial coupling, burst erasure channels