We consider spatially coupled low-density parity-check codes with finite smoothing parameters. A finite smoothing parameter is important for designing practical codes that are decoded using low-complexity windowed decoders. By optimizing the amount of coupling between spatial positions, we show that we can construct codes with improved decoding speed compared with conventional, uniform smoothing constructions. This leads to a significantly better performance under decoder complexity constraints while keeping the degree distribution regular. We optimize smoothing configurations using differential evolution and illustrate the performance gains by means of a simulation.
@article{arxiv.1904.07026,
title = {Spatially Coupled LDPC Codes with Non-uniform Coupling for Improved Decoding Speed},
author = {Laurent Schmalen and Vahid Aref},
journal= {arXiv preprint arXiv:1904.07026},
year = {2019}
}
Comments
to be presented as invited paper at ITW 2019. arXiv admin note: text overlap with arXiv:1701.07629