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arXiv 2507.03461cs.ITeess.SPmath.IT
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学习变量节点选择以改进多轮置信传播译码

Learning Variable Node Selection for Improved Multi-Round Belief Propagation Decoding

Ahmad Ismail, Raphaël Le Bidan, Elsa Dupraz, Charbel Abdel Nour

AI总结:

本文提出一种受SBND启发的神经网络架构,用于学习预测MRBP译码中需扰动的变量节点,从而以更少译码轮次达到接近最大似然译码的性能。

摘要:

短码长下的纠错对低密度奇偶校验(LDPC)码而言仍然是一个挑战,因为与最大似然译码(MLD)相比,置信传播(BP)译码是次优的。虽然BP很少产生错误,但它常常由于少量有问题的错误变量节点(VN)而无法收敛。多轮BP(MRBP)译码通过识别并扰动这些VN来提升性能,使BP在后续译码尝试中能够成功。然而,现有的用于VN识别的启发式方法可能需要大量译码轮次才能接近ML性能。在本文中,我们在MRBP中识别待扰动的候选VN与估计信道输出错误之间建立了联系,后者此前已由基于校验子的神经译码器(SBND)解决。利用这一见解,我们提出了一种受SBND启发的神经网络架构,该架构学习预测MRBP需要关注哪些VN。实验结果表明,所提出的学习方法优于文献中的专家规则,只需更少的MRBP译码尝试即可达到接近MLD的性能。这使其成为改进短LDPC码译码的一个有前景的方向。

英文摘要:

Error correction at short blocklengths remains a challenge for low-density parity-check (LDPC) codes, as belief propagation (BP) decoding is suboptimal compared to maximum-likelihood decoding (MLD). While BP rarely makes errors, it often fails to converge due to a small number of problematic, erroneous variable nodes (VNs). Multi-round BP (MRBP) decoding improves performance by identifying and perturbing these VNs, enabling BP to succeed in subsequent decoding attempts. However, existing heuristic approaches for VN identification may require a large number of decoding rounds to approach ML performance. In this work, we draw a connection between identifying candidate VNs to perturb in MRBP and estimating channel output errors, a problem previously addressed by syndrome-based neural decoders (SBND). Leveraging this insight, we propose an SBND-inspired neural network architecture that learns to predict which VNs MRBP needs to focus on. Experimental results demonstrate that the proposed learning approach outperforms expert rules from the literature, requiring fewer MRBP decoding attempts to reach near-MLD performance. This makes it a promising lead for improving the decoding of short LDPC codes.

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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