LDPC的短码，码长为40速率为0.5的LDPC码的设计，用的是QC矩阵，压缩文件为原码部分，工程太大传不上去。-LDPC short code, a code length of 40 rate of 0.5 LDPC code design, using a QC matrix, the compressed file is part of the original code, do not pass up the works to