论文标题
关于具有子块访问的空间耦合的LDPC代码的解码性能
On the Decoding Performance of Spatially Coupled LDPC Codes with Sub-block Access
论文作者
论文摘要
我们研究了空间耦合的LDPC代码，该代码允许访问比完整代码块小得多的子块。亚块访问是由半全球解码器实现的，该解码器仅通过访问目标来解码所选目标子块，再加上代码链中附近的规定数量的辅助子块。本文开发了一种理论方法，用于分析由原理构成的空间耦合的LDPC代码的半全球解码性能。主要结果表明，半全球解码阈值可以从我们为单次块图形定义的某些阈值中得出。这些表征阈值也用于在分解器的性能上得出跨块跨块的通道的下限，这是由于数据存储中的应用而动机。
We study spatially coupled LDPC codes that allow access to sub-blocks much smaller than the full code block. Sub-block access is realized by a semi-global decoder that decodes a chosen target sub-block by only accessing the target, plus a prescribed number of helper sub-blocks adjacent in the code chain. This paper develops a theoretical methodology for analyzing the semi-global decoding performance of spatially coupled LDPC codes constructed from protographs. The main result shows that semi-global decoding thresholds can be derived from certain thresholds we define for the single-sub-block graph. These characterizing thresholds are also used for deriving lower bounds on the decoder's performance over channels with variability across sub-blocks, which are motivated by applications in data-storage.
