通信学报 ›› 2015, Vol. 36 ›› Issue (2): 193-199.doi: 10.11959/j.issn.1000-436x.2015048

• 学术通信 • 上一篇    下一篇

基于改进2-D GRS码的QC-LDPC码高效构造

赵明,张晓林   

  1. 北京航空航天大学 电子信息工程学院,北京 100191
  • 出版日期:2015-02-25 发布日期:2017-06-27
  • 基金资助:
    中国国家地面数字电视研究工程应用基金资助项目

Novel construction of QC-LDPC codes with modified 2-D GRS codes

Ming ZHAO,Xiao-lin ZHANG   

  1. School of Electronic and Information Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China
  • Online:2015-02-25 Published:2017-06-27
  • Supported by:
    The Application of China National Terrestrial Digital TV System Research Project

摘要:

利用GRS(generalized reed-solomon)码的生成多项式提出了基于改进的2-D GRS(two-dimensional GRS)码设计和构造QC-LDPC(quasi-cyclic low density parity-check)码的方法,使所构造的码具有较好的译码性能。同时在码的构造过程中,考虑到了准双对角线结构和合适的度分布。不同码率的LDPC码用于和新设计的QC-LDPC码进行测试和比较。实验结果表明,所提出的码构造方法可加快LDPC码校验矩阵的构造,同时基于所提出方法构造的QC-LDPC码可提高译码性能,并降低编码复杂度。

关键词: QC-LDPC码, 码构造, 改进的2-DGRS码, 矩阵扩展, 度分布

Abstract:

The construction method for QC-LDPC (quasi-cyclic low density parity-check) code with modified two-dimensional generalized reed-solomon (2-D GRS) code is proposed using the generator polynomial of GRS code,so thus the constructed code can have better decoding performance.Meanwhile both the quasi dual-diagonal structure and proper weight distributions are considered during the construction.The QC-LDPC codes with different rates are used to compare with the new designed codes.Experimental results show that the proposed method can accelerate the construction and QC-LDPC codes constructed from the proposed method can have better decoding performance while with low encoding complexity.

Key words: QC-LDPC code, code construction, modified 2-D GRS code, matrix dispersion, degree distributions

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