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- W2950216785 abstract "We study LDPC codes for the channel with $2^m$-ary input $underline{x}in mathbb{F}_2^m$ and output $underline{y}=underline{x}+underline{z}in mathbb{F}_2^m$. The receiver knows a subspace $Vsubset mathbb{F}_2^m$ from which $underline{z}=underline{y}-underline{x}$ is uniformly chosen. Or equivalently, the receiver receives an affine subspace $underline{y}-V$ where $underline{x}$ lies. We consider a joint iterative decoder involving the channel detector and the LDPC decoder. The decoding system considered in this paper can be viewed as a simplified model of the joint iterative decoder over non-binary modulated signal inputs e.g., $2^m$-QAM. We evaluate the performance of binary spatially-coupled MacKay-Neal codes by density evolution. The iterative decoding threshold is seriously degraded by increasing $m$. EXIT-like function curve calculations reveal that this degradation is caused by wiggles and can be mitigated by increasing the randomized window size. The resultant iterative decoding threshold values are very close to the Shannon limit." @default.
- W2950216785 created "2019-06-27" @default.
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- W2950216785 date "2012-02-05" @default.
- W2950216785 modified "2023-09-26" @default.
- W2950216785 title "Spatially-Coupled Binary MacKay-Neal Codes for Channels with Non-Binary Inputs and Affine Subspace Outputs" @default.
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- W2950216785 doi "https://doi.org/10.48550/arxiv.1202.0979" @default.
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