Min Sum Algorithm Using Multi Edge Type Normalized Scheme for ATSC 3.0 LDPC Decoders
To offer commercial LDPC decoders with better performance, in this paper, multi edge type (MET) normalized scheme is proposed to improve the performance of traditional min sum algorithm (MSA) and its modified versions. With respect to sum product algorithm (SPA) we firstly analyze and find out that the degradations of convergence in different edge types are distinct in MSA theoretically. To compensate the different degradations above, proposed MET normalized scheme is used in normalized min sum algorithm (MET NMSA) In addition, MET based density evolution (MET DE) is also presented to search optimized MET scaling factors for MET NMSA. To further verify the validity of MET normalized scheme, Advanced Television Systems Committee (ATSC) 3.0 LDPC codes are used to evaluate MET NMSA in comparison with the conventional algorithms, i.e. normalized min sum algorithm (NMSA) offset min sum algorithm (OMSA) and variable scaling normalized min sum algorithm (VS NMSA) Extensive simulation results show that MET NMSA for ATSC 3.0 LDPC decoders has at most 1.53dB, 0.21dB and 0.35dB gain over NMSA, OMSA and VS NMSA respectively when frame error rate (FER) is at 10 4 level over additive white Gaussian noise (AWGN) channels using QPSK modulation.
IEEE Transactions on Broadcasting