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arXiv 2301.01899cs.ITmath.IT
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关于稀疏回归LDPC码

On Sparse Regression LDPC Codes

Jamison R. Ebert, Jean-Francois Chamberland, Krishna R. Narayanan

摘要:

置信传播应用于迭代解码和稀疏恢复通过近似消息传递(AMP)是两个研究领域,近几十年来取得了巨大的进展。受这些进展的启发,本文介绍了稀疏回归LDPC码及其译码。稀疏回归码(SPARC)是一类基于压缩感知思想的纠错码,可以使用AMP进行解码。在某些设置中,SPARC被称为实现容量;然而,它们的性能在有限的块长度下受到影响。同样地,LDPC码可以使用置信传播来有效地解码,并且还可以实现容量。本文介绍了一种新的级联编码结构,结合LDPC外码和一个SPARC启发的内码。对于这样的代码的有效解码可以使用AMP与在外部LDPC码的因子图上执行置信传播的去噪器来实现。所提出的框架表现出性能改进SPARC和标准LDPC码有限块长度,并导致在错误性能的陡峭的瀑布,未编码SPARC中观察到的现象。研究结果得到了数值结果的支持。

英文摘要:

Belief propagation applied to iterative decoding and sparse recovery through approximate message passing (AMP) are two research areas that have seen monumental progress in recent decades. Inspired by these advances, this article introduces sparse regression LDPC codes and their decoding. Sparse regression codes (SPARCs) are a class of error correcting codes that build on ideas from compressed sensing and can be decoded using AMP. In certain settings, SPARCs are known to achieve capacity; yet, their performance suffers at finite block lengths. Likewise, LDPC codes can be decoded efficiently using belief propagation and can also be capacity achieving. This article introduces a novel concatenated coding structure that combines an LDPC outer code with a SPARC-inspired inner code. Efficient decoding for such a code can be achieved using AMP with a denoiser that performs belief propagation on the factor graph of the outer LDPC code. The proposed framework exhibits performance improvements over SPARCs and standard LDPC codes for finite block lengths and results in a steep waterfall in error performance, a phenomenon not observed in uncoded SPARCs. Findings are supported by numerical results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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