实现QC-LDPC码字的cycle的search功能，算法为hill climbing算法，能有效去除QC-LDPC码字里长为4,6,8的环，使得码字有较好纠错的性能-Realization of QC-LDPC codeword cycle of search functions, algorithms for the hill climbing algorithm, can effectively remove the QC-LDPC codeword length of 4,6,8 in

能够计算出QC-LDPC码字里所有长为8的环-Be able to calculate the QC-LDPC codeword length of the ring in all 8

File is used for counting short cycle of ldpc codes. You must give parity check matrix of ldpc code in text file and then use cycle count file of matlab for counting of short cycle of given length.