基于可靠性调度的LDPC码比特翻转译码算法

Reliability-based Scheduling for Bit-flipping Decoding Algorithm of LDPC Codes

低密度校验(Low-Density Parity-Check,LDPC)码的迭代译码算法中,变量节点与校验节点之间的消息传递采用泛洪调度策略,文中提出了一种基于可靠性调度策略的比特翻转译码算法,根据信道初始软信息将变量节点分为可靠节点与不可靠节点,在迭代译码过程中阻止不可靠节点的消息传递。仿真结果表明,与现有的比特翻转译码算法相比,在加性高斯白噪声信道下,所提算法以较低的复杂度代价获得了误码率性能的有效提升。

In the iterative decoding algorithm of LDPC codes,flood scheduling strategy is adopted for message passing between variable nodes and check nodes.This paper proposes a bit-flipping decoding algorithm based on reliability scheduling.According to the soft information,the variable nodes are divided into reliable nodes and unreliable nodes,and prevent the transmission of unreliable nodes during iterative decoding.Simulation results show that the proposed algorithm achieves better BER performance than the bit-flipping decoding algorithm with lower complexity cost over the additive white Gaussian noise channel.