A Further Research on Two-phase Decoding for GC-LDPC Codes
Wei Zhou, Lijun Zhang, Qiang Sun · 2018
For GC-LDPC code, a targeted decoding scheme is the two-phase decoding scheme, i.e., the local decoding phase and the global decoding phase. For both the phases, we find the direct application of log-domin belief propagation (BP) algorithm will lead to error. Hence, we propose an improved log-domin BP algorithm and it will be used in the two-phase decoding scheme. Since the two-phase decoding scheme has a large gain loss, we present a modified two-phase decoding scheme in order to further accelerate the convergence rate. Simulation results show that the modified two-phase decoder has a gain of about 0.2 dB compared to the two-phase decoder. Moreover, it also can reduce complexity by 33.4% in high SNR compared with the whole decoder.