lDPC校验矩阵的环检测。包括4环检测算法，6环检测算法及8环检测算法。还包括一个准循环LDPC奇偶校验矩阵的生成算法。-this algrithm can search cycles in LDPC parity check matrix。It contain cycle-4 cycle-6 cycle-8 test algrithm.It also contains a algrithm for generate the LDPC quasi-cyclic parity check matr

本程序是围长为8的QC-LDPC码设计，包括了4、6、8环的检测-This program is the girth of 8 QC-LDPC code design, including the detection of 4,6,8 ring

最小环长为6的LDPC码构造代码,能构造性能优良的LDPC码-the min girth is 6 LDPC construction method

ldpc 低密度奇偶校验矩阵 4环、6环检测程序-ldpc 4/6cycle test program

qc-ldpc码编程，围长为6，列重为3，无4环-The algorithm divides rows into three equal groups. The rows are then connnected to form a distance graph which is then transformed in to a matrix. Girth of six is maintained by avoiding four-cycles. No two rows are connected