Construction of QC-LDPC codes with large minimum distances and large girths
Haige Xiang · Journal of Circuits and Systems · 2011
The properties of the degree distribution,minimum distances and girths of QC-LDPC codes based on permutation matrixes are represented in this paper.A set of QC-LDPC codes simultaneously possessing large minimum distances and large girths is proposed.The construction of a QC-LDPC code can be divided into two steps,constructing a base matrix with suitable degrees and a large minimum distance and choosing proper shifting sizes for its model matrix.Simulation results show that the proposed methodology can outperform the LDPC code adopted by 802.16e within a wide range of code lengths.