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arXiv 2501.12293cs.ITcs.CCcs.DSmath.IT
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改进的 Tanner 码解码

Improved Decoding of Tanner Codes

School of the Gifted Young & College of Computer Science, University of Science and Technology of China(中国科学技术大学少年班学院与计算机学院);Department of Computer Science and Engineering, The Ohio State University(俄亥俄州立大学计算机科学工程系)

Zhaienhe Zhou, Zeyu Guo

AI总结:

研究改进 Tanner 码解码算法,提出随机及确定性线性时间算法提升解码半径,研究大小扩展权衡获最小距离新界限,扩展 Viderman 框架得到特定条件下的确定性线性时间解码器。

摘要:

本文提出了基于扩展器的 Tanner 码的改进解码算法。首先开发了一种随机线性时间解码算法,在\(\delta d_0 > 2\)条件下,能纠正 Tanner 码\(T(G, C_0)\)中多达\(\alpha n\)个错误,改进了前人工作。接着将算法去随机化得到具有相同解码半径的确定性线性时间算法。还研究了近期工作引入的大小扩展权衡,给出了 Tanner 码最小距离新界限。最后扩展了 Viderman 的框架得到特定条件下的确定性线性时间解码器。

英文摘要:

In this paper, we present improved decoding algorithms for expander-based Tanner codes. We begin by developing a randomized linear-time decoding algorithm that, under the condition that $ δd_0 > 2 $, corrects up to $ αn $ errors for a Tanner code $ T(G, C_0) $, where $ G $ is a $ (c, d, α, δ) $-bipartite expander with $n$ left vertices, and $ C_0 \subseteq \mathbb{F}_2^d $ is a linear inner code with minimum distance $ d_0 $. This result improves upon the previous work of Shen, Shangguan, Ouyang and Cheng (IEEE TIT 2025), which required $ δd_0 > 3 $. We further derandomize the algorithm to obtain a deterministic linear-time decoding algorithm with the same decoding radius. Our algorithm improves upon the previous deterministic algorithm of Cheng et al.\ by achieving a decoding radius of $ αn $, compared with the previous radius of $ \frac{2α}{d_0(1 + 0.5cδ) }n$. Additionally, we investigate the size-expansion trade-off introduced by the recent work of Chen, Cheng, Li, and Ouyang (IEEE TIT 2023), and use it to provide new bounds on the minimum distance of Tanner codes. Specifically, we prove that the minimum distance of a Tanner code $T(G,C_0)$ is approximately $f_δ^{-1} \left( \frac{1}{d_0} \right) αn $, where $ f_δ(\cdot) $ is the Size-Expansion Function. As another application, we improve the decoding radius of our decoding algorithms from $αn$ to approximately $f_δ^{-1}\left(\frac{2}{d_0}\right)αn$. Finally, we extend Viderman's find-erasures-and-decode framework (ACM TOCT 2013) to general linear inner codes, obtaining a deterministic linear-time decoder for $δd_{0}>1.8$ when $d_0=3$, thus pushing below the $δd_0 > 2$ threshold of our general result.

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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