Coset-based Quasi-Cyclic LDPC Code Construction
Yuansheng Tang · Jisuanji gongcheng · 2009
This paper proposes a coset-based Quasi-Cyclic Low Density Parity Check(QC LDPC) construction method and similar SFT-LDPC code construction method in order to guarantee the girth under high bitrate.It gives two necessary conditions of girth at least 6 when the size of cyclic permutation matrix is a composite number.This construction method with various lengths,rates and girth at least 6 can be flexiblely constructed.Simulation results show that the code constructed by this method is comparable to random ones in error correction performance over additive white Gaussian noise channel.