ldpc码中，再生成H矩阵时，检测4 .6 .8环的快速方法

Alternative good LDPC codes for DVB-S2-In our following paper, we find that the shortten codes of DVB-S2 have some problems,this program can provide a good DVB-S2 LDPC code without cascaded BCH codes. [1] Yang Xiao, Kiseon Kim, "Alternative

查找ldpc校验矩阵中的6环，并将其记录到txt文件中-Find ldpc check matrix of the six rings, and its records to a txt file