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Min-Sum Algorithm Using Multi-Edge-Type Normalized Scheme for ATSC 3.0 LDPC Decoders
IEEE Transactions on Broadcasting ( IF 4.5 ) Pub Date : 2020-09-01 , DOI: 10.1109/tbc.2020.2977557
Na Gao , Yin Xu , Dazhi He , Sung-Ik Park , Hanjiang Hong , Hao Ju , Changwen Chen , Wenjun Zhang

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.

中文翻译:

对 ATSC 3.0 LDPC 解码器使用多边类型归一化方案的 Min-Sum 算法

为了提供具有更好性能的商用 LDPC 解码器,本文提出了多边型 (MET) 归一化方案,以提高传统最小和算法 (MSA) 及其修改版本的性能。对于和积算法(SPA),我们首先分析并发现MSA中不同边缘类型的收敛性退化在理论上是不同的。为了补偿上述不同的退化,在归一化最小和算法(MET-NMSA)中使用了提出的 MET 归一化方案。此外,还提出了基于 MET 的密度演化 (MET-DE) 来搜索优化的 MET-NMSA 的 MET 缩放因子。为了进一步验证 MET 归一化方案的有效性,与传统算法相比,高级电视系统委员会 (ATSC) 3.0 LDPC 代码用于评估 MET-NMSA,即,归一化最小和算法 (NMSA)、偏移最小和算法 (OMSA) 和可变尺度归一化最小和算法 (VS-NMSA)。广泛的仿真结果表明,当帧错误率 (FER) 在 10-4 级时,ATSC 3.0 LDPC 解码器的 MET-NMSA 分别比 NMSA、OMSA 和 VS-NMSA 分别具有最多 1.53dB、0.21dB 和 0.35dB 的增益。使用 QPSK 调制的高斯噪声 (AWGN) 通道。
更新日期:2020-09-01
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