论文标题
解码器错误传播缓解了空间耦合的LDPC代码
Decoder Error Propagation Mitigation for Spatially Coupled LDPC Codes
论文作者
论文摘要
在本文中，我们介绍了两种新方法，用于缓解解码器误差传播，以实现空间耦合低密度奇偶校验检查（SC-ldpc）代码的低延迟滑动窗口解码（SWD）。基于\ emph {check node（cn）掺杂}的最近引入的常规SC-LDPC代码的想法，在这里，我们采用可变节点（VN）掺杂来修复（设置为已知值）耦合链中可变节点的子集。这两种掺杂方法都具有允许SWD从错误传播中恢复的作用，费用略有损失。实验结果表明，与CN掺杂相似，VN掺杂可提高性能多达两个数量级，而在典型的信噪比操作范围内未扎的SC-LDPC代码相比。此外，与CN掺杂相比，VN掺杂的优点是不需要对解码过程进行任何更改。此外，提出了基于log-likikelihood-Ratio窗口扩展算法来减少误差传播的效果。使用这种方法，我们表明可以将解码延迟减少到很大一部分而不会遭受任何绩效损失的情况下。
In this paper, we introduce two new methods of mitigating decoder error propagation for low-latency sliding window decoding (SWD) of spatially coupled low density parity check (SC-LDPC) codes. Building on the recently introduced idea of \emph{check node (CN) doping} of regular SC-LDPC codes, here we employ variable node (VN) doping to fix (set to a known value) a subset of variable nodes in the coupling chain. Both of these doping methods have the effect of allowing SWD to recover from error propagation, at a cost of a slight rate loss. Experimental results show that, similar to CN doping, VN doping improves performance by up to two orders of magnitude compared to undoped SC-LDPC codes in the typical signal-to-noise ratio operating range. Further, compared to CN doping, VN doping has the advantage of not requiring any changes to the decoding process.In addition, a log-likelihood-ratio based window extension algorithm is proposed to reduce the effect of error propagation. Using this approach, we show that decoding latency can be reduced by up to a significant fraction without suffering any loss in performance.
