Research on Construction of Quasi-Cyclic LDPC Codes Based on PEG Algorithm
Zhang Jian-bin · Dianzi qijian · 2012
In order to take into account the requirements of high error correction performance and simple hardware implementation of LDPC codes,this paper presents a new algorithm for constructing check matrix of LDPC codes based on PEG algorithm.After constructing a basic matrix with PEG algorithm,we can get cyclic shift matrix under the proposed formula of shift parameter,and then,using the cyclic shift matrix and all-zero matrix to extend the basic matrix optimally,we can get the quasi-cyclic LDPC matrix in which the girth is 8 at least.The algorithm ' s error correction performance is very close to that of PEG algorithm,and is particularly better than that of PEG algorithm when S/N is higher than 1.2 dB.It ' s hardware implementation is more simple than that of PEG algorithm,and the algorithm is flexibly to set the parameters of the LDPC codes.