LDPC码编译码源程序，可生成任意非规则二进制校验矩阵，并可进行LLR BP译码,LDPC codec source code can be generated non-arbitrary rules binary check matrix, LLR BP decoding can be carried out

Flexible construction of girth-six QC-LDPC Codes-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