Flexible construction of girth-six QC-LDPC Codes

constructs girth-six QC-LDPC codes given a row-weight,column-weight, sub-matrix size.

Description

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.

• MATLAB release: MATLAB 7 (R14)

[Yang Xiao]

Please check the BER of your codes: when j=4, k=8, m=57, the BER is very poor though it has no girth-4. Why?

[Gabofetswe Malema]

I have BER and FER simulations for the (456,4,8) code (i.e m=57). The performance is okay and comparable to other (4,8) codes.
thank you.