基于变量节点概率差的多进制LDPC码调度算法  

Scheduling algorithm based on nodes probability difference for Non-binary LDPC codes

作　　者：张立军[1] 朱培培[1] 

机构地区：[1]北京交通大学电子信息工程学院,北京100044

出　　处：《信息技术》2016年第4期105-108,113,共5页Information Technology

摘　　要：针对多进制低密度奇偶校验(NB-LDPC)码的译码算法收敛速度较慢的问题,提出一种基于变量节点概率差的调度(Q-VNPDS)译码算法。该算法通过计算变量节点更新前后的最大概率差确定信息更新的顺序。从降低译码算法复杂度方面考虑,又提出了改进的Q-VNPDS算法。两种新的调度算法与泛洪调度译码算法相比提高了译码性能并且加快了收敛速度。To accelerate the convergence speed of decoding algorithm for non-binary LDPC codes,a scheduling decoding algorithm based on node probability difference for non-binary LDPC codes（ QVNPDS） is proposed. The Q-VNPDS decoding algorithm calculates the difference between the probability of variable node in the current iteration and the probability of variable node in previous iteration to determine the order of information update. The improved Q-VNPDS is proposed for reducing the decoding complexity. The simulation results show that the two new algorithms have better performance and faster convergence than the flooding scheduling decoding algorithm.

关 键 词：多进制LDPC码 调度 度量值 

分 类 号：TN911.22[电子电信—通信与信息系统]