Abstract: In this paper, the decoding algorithm of low-density parity-check（I.DPC）codes is analyzed,and a new decoding algorithm based on the belief propagation（BP）algorithm to eliminate the influence of cycles in the factor graph is proposed. In the traditional BP

Key words: Low-density parity-check（LDPC）codes,Belief propagation（BP）algorithm,Cycle, Factor graph,Iterative decoding