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arXiv 2102.11089cs.ITmath.IT
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可变节点动态调度下LDPC码的置信传播译码

Belief-Propagation Decoding of LDPC Codes with Variable Node-Centric Dynamic Schedules

Tofar C. -Y. Chang, Pin-Han Wang, Jian-Jia Weng, I-Hsiang Lee, Yu T. Su

摘要:

为了提高传统洪泛译码算法的译码效率,提出了采用不同动态译码算法的低密度奇偶校验(LDPC)码的置信传播(BP)译码。由于理想LDPC码解码器的最终目标是具有正确的比特判决,因此动态解码调度应该是以可变节点(VN)为中心的,并且能够找到具有可能的不正确判决的VN,并且如果被选择用于更新,则具有被校正的良好机会。我们提出了一种新的和有效的度量称为条件创新(CI),这很好地服务于这一设计目标。为了充分利用动态调度产生高可靠性的位决策,我们限制我们的搜索候选VN相关的最新更新的节点。基于CI度量和新的搜索准则单独或组合,我们开发了几个高效的解码方案。为了减少解码延迟,我们引入了多边缘更新版本,提供额外的延迟性能权衡。数值结果表明,单边和多边算法都提供了更好的解码性能对大多数动态调度和CI为基础的算法是特别令人印象深刻的,在前几个解码迭代。

英文摘要:

Belief propagation (BP) decoding of low-density parity-check (LDPC) codes with various dynamic decoding schedules have been proposed to improve the efficiency of the conventional flooding schedule. As the ultimate goal of an ideal LDPC code decoder is to have correct bit decisions, a dynamic decoding schedule should be variable node (VN)-centric and be able to find the VNs with probable incorrect decisions and having a good chance to be corrected if chosen for update. We propose a novel and effective metric called conditional innovation (CI) which serves this design goal well. To make the most of dynamic scheduling which produces high-reliability bit decisions, we limit our search for the candidate VNs to those related to the latest updated nodes only. Based on the CI metric and the new search guideline separately or in combination, we develop several highly efficient decoding schedules. To reduce decoding latency, we introduce multi-edge updating versions which offer extra latency-performance tradeoffs. Numerical results show that both single-edge and multi-edge algorithms provide better decoding performance against most dynamic schedules and the CI-based algorithms are particularly impressive at the first few decoding iterations.

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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