Non-Uniform Spatially-Coupled LDPC Codes over GF(2m)

2018 IEEE International Symposium on Information Theory (ISIT)(2018)

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摘要
In this paper we consider the generalization of binary non-uniformly coupled low-density parity-check (LDPC) codes to that over Galois field GF (2 m ). We will perform an iterative decoding threshold analysis for this class of non-uniformly coupled LDPC ensembles formed by randomly coupled and protograph-based coupled ensembles, respectively. By optimizing the coupling among spatial positions, we can construct codes having excellent thresholds and small rate-loss. Moreover, we propose a list-aided windowed decoding (list-aided WD) scheme for nonbinary SC-LDPC codes with low decoding latency. Numerical results show that the list-aided WD which outperforms conventional WD can perform better performance and lower decoding latency than the flooding-schedule decoding at low SNRs on the additive white Gaussian noise channel.
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关键词
nonbinary SC-LDPC codes,flooding-schedule decoding,nonuniform spatially-coupled LDPC codes,low-density parity-check codes,iterative decoding threshold analysis,randomly coupled protograph-based coupled ensembles,decoding latency,Galois field,list-aided windowed decoding,list-aided WD scheme,GF(2m),additive white Gaussian noise channel
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