Freeware Listing: Girth

Recently, we find some published programs for the construction of LDPC codes have not concerned the Girth test problem, which will not the implementation of LDPC Codec to have good decoding BER. Thus, we publish a simple program to provide a tool for the girth 4 test of LDPC codes. Input a parity check matrix H with the format of the example in the program, the program can determine whether it has girth 4..

  • Publisher: Yang Xiao
  • Date: 10-01-2013
  • Size: 10 KB
  • Platform: Matlab, Scripts

The program constructs girth-twelve column-weight QC-LPDC codes. The rate can be changed by changing k(row-weight), size is changed by varying m(sub-matrix size). The program/algorithm does not guarantee to get girth twelve code. It guarantees girth of eight. One may need to run the programs many times to get girth of twelve..

  • Platform: Matlab, Scripts

The program constructs girth-six QC-LDPC codes given row-weight,k, column-weight,j, and sub-matrix size,m. The obtained parity-check matrix is stored in H. The construction has flexibility in that j,k and m can be varied.The program achieves girth-six by applying the row-column constraint. There are m rows in j submatrices. No two rows should share the same column more than once. This constraint is applied to avoid 4-cycles. The construction has flexibility in that j,k and m can be varied..

  • Platform: Matlab, Scripts

The program contructs column-weight three girth-eight QC-LPDC codes given row-weight and sub-matrix size. row-weights and sub-matrices sizes are variable..

  • Platform: Matlab, Scripts

Copyright (C2010-2013) Yang XIAO, BJTU, April 16, 2010, E-Mail: yxiao@bjtu.edu.cn. This program can produce the Parity Check Matrices of DVBS2 codes, while Ref. [1] remindes you that these codes are not good as the LDPC codes IEEE802.16e for continuous bits' errors. Refenrences: [1] X. Huang, Y. Xiao, J. Fan and K. Kim, Girth 4 and low minimum weights' problems of LDPC codes in DVB-S2 and solutions, Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing table of contents Beijing, China, Pages: 601-604, 2009, ISBN:978-1-4244-3692-7 [2] Xiao Y.

  • Publisher: Yang Xiao
  • Date: 05-04-2013
  • Size: 20 KB
  • Platform: Matlab, Scripts

Girth: Freeware | All

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