Hard-Information Bit-Reliability Based Decoding Algorithm for Majority-Logic Decodable Nonbinary LDPC Codes

Abstract

A modified bit-reliability based decoding algorithm is presented based on a recent work by Huang et al . For the presented algorithm, only one Galois field element is passed and exchanged along the edges of the Tanner graph. At variable nodes, full messages rather than extrinsic messages are processed to further reduce the computational complexity. At check nodes, only hard reliability is considered and the main operation is to compute the check-sum and send one extrinsic symbol back to variable nodes. Simulation results show that, even with lower complexity and less memory consumption, the presented algorithm still can perform very closely to the original wBRB algorithm with low quantization bits ( $3 \sim 4\,\text{bits}$ ) when decoding the majority-logic decodable nonbinary LDPC codes. For codes constructed in high order fields, the presented algorithm can even outperform the original wBRB algorithm.