Spatially Coupled LDPC Codes with Sub-Block Locality

Eshed Ram, Yuval Cassuto

פרסום מחקרי: פרסום בכתב עתמאמרביקורת עמיתים


A new type of spatially coupled low-density parity-check (SC-LDPC) codes motivated by practical storage applications is presented. SC-LDPCL codes (suffix 'L' stands for locality) can be decoded locally at the level of sub-blocks that are much smaller than the full code block, thus offering flexible access to the coded information alongside the strong reliability of the global full-block decoding. Toward that, we propose constructions of SC-LDPCL codes that allow controlling the trade-off between local and global correction performance. In addition to local and global decoding, the paper develops a density-evolution analysis for a decoding mode we call semi-global decoding, in which the decoder has access to the requested sub-block plus a prescribed number of sub-blocks around it. SC-LDPCL codes are also studied under a channel model with variability across sub-blocks, for which decoding-performance lower bounds are derived.

שפה מקוריתאנגלית
מספר המאמר9354799
עמודים (מ-עד)2739-2757
מספר עמודים19
כתב עתIEEE Transactions on Information Theory
מספר גיליון5
מזהי עצם דיגיטלי (DOIs)
סטטוס פרסוםפורסם - מאי 2021

ASJC Scopus subject areas

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