Research on decoding algorithm for LDPC codes to weaken oscillating nodes

In order to improve the BER performance of dynamic scheduling algorithm, the VNO-RBP(based on VN message oscillation of RBP) algorithm was proposed in this paper.This algorithm was based on the NW-RBP algorithm,when the decoder began to oscillate, we would select the nodes with larger residual that need prior updating by making reference to the relative reliability of variable nodes in the process of decoding so as to speed the decoding speed.At the same time, selecting the target nodes that arise oscillation ,executing weighted mean processing to LLR values generated before and after updating so as to reduce the unreliability of variable nodes. The theoretical analysis and simulation results demonstrate that compared with NW-RBP algorithm,the proposed VNO-RBP decoding algorithm has lower decoding complexity and its BER performance improves 0.31dB when the error rate reaches 10^-5.