251. On the Decoding Performance of Spatially Coupled LDPC Codes With Sub-Block Access.
- Author
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Ram, Eshed and Cassuto, Yuval
- Subjects
LOW density parity check codes ,BLOCK codes ,DATA warehousing ,MARKOV processes - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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