基于变量节点更新的梯度下降比特翻转译码算法 (Gradient Descent Bit-flipping Decoding Algorithm Based on Updating of Variable Nodes)

Xuan Zhang, Chao Jiang, Xiaoqiang Li, Sha Yan

Abstract: The reliability metric of the variable node does not change with flipping the bits during the process of iterative decoding,so the calculation of flipping-function is not accurate,which affects the decoding performance of gradient descent bit-flipping(GDBF) algorithm.Based on the analysis of gradient descent bit-flipping decoding algorithm,a weighted GDBF algorithm was proposed based on updating of variable nodes.This algorithm introduces extrinsic reliability information weights of the check nodes and update rules of the variable nodes for flipping-function,which makes the calculation of flipping-function more accurate.Simulation results show that the BER performance of the proposed algorithm is better than that of the gradient descent bit-flipping decoding algorithm over the additive white Gaussian noise channel.