A Modified Extended Min-Sum Algorithm based on Posterior Probability
Thresholding for Non-binary LDPC Codes
This letter focuses on the improvement in the error correction
performance of the extended min-sum (EMS) decoding algorithm.
Introducing factor/offset modifications in the check node update process
of the EMS algorithm can improve the performance. Based on this, we
propose a novel threshold-based modified EMS algorithm that introduces
the factor/offset in a targeted manner by setting a threshold for the
posterior probability. Simulation results show that an additional
performance gain of the order of 0.08 dB is obtained with the proposed
method without significantly increasing the method’s complexity.