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Rate-Compatible Spatially-Coupled LDPC Code Ensembles With Nearly-Regular Degree Distributions

Nitzold, Walter; Lentmaier, Michael LU and Fettweis, Gerhard (2015) IEEE International Symposium on Information Theory (ISIT), 2015 In [Host publication title missing]
Abstract
Spatially-coupled regular LDPC code ensembles have outstanding performance with belief propagation decoding and can perform arbitrarily close to the Shannon limit without requiring irregular graph structures. In this paper, we are concerned with the performance and complexity of spatially-coupled ensembles with a rate-compatibility constraint. Spatially-coupled regular ensembles that support rate-compatibility through extension have been proposed before and show very good performance if the node degrees and the coupling width are chosen appropriately. But due to the strict constraint of maintaining a regular degree, there exist certain unfavorable rates that exhibit bad performance and high decoding complexity. We introduce an altered LDPC... (More)
Spatially-coupled regular LDPC code ensembles have outstanding performance with belief propagation decoding and can perform arbitrarily close to the Shannon limit without requiring irregular graph structures. In this paper, we are concerned with the performance and complexity of spatially-coupled ensembles with a rate-compatibility constraint. Spatially-coupled regular ensembles that support rate-compatibility through extension have been proposed before and show very good performance if the node degrees and the coupling width are chosen appropriately. But due to the strict constraint of maintaining a regular degree, there exist certain unfavorable rates that exhibit bad performance and high decoding complexity. We introduce an altered LDPC ensemble construction that changes the evolution of degrees over subsequent incremental redundancy steps in such a way, that the degrees can be kept low to achieve outstanding performance close to Shannon limit for all rates. These ensembles always outperform their regular counterparts at small coupling width. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
incremental redundancy, spatially coupled codes, spatial coupling, LDPC codes, rate-compatible
in
[Host publication title missing]
pages
5 pages
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
conference name
IEEE International Symposium on Information Theory (ISIT), 2015
external identifiers
  • Scopus:84969771749
language
English
LU publication?
yes
id
3ec9e859-cac9-42b4-83a0-27ae84dda4fe (old id 7442603)
date added to LUP
2015-07-20 10:31:55
date last changed
2016-10-13 04:43:57
@misc{3ec9e859-cac9-42b4-83a0-27ae84dda4fe,
  abstract     = {Spatially-coupled regular LDPC code ensembles have outstanding performance with belief propagation decoding and can perform arbitrarily close to the Shannon limit without requiring irregular graph structures. In this paper, we are concerned with the performance and complexity of spatially-coupled ensembles with a rate-compatibility constraint. Spatially-coupled regular ensembles that support rate-compatibility through extension have been proposed before and show very good performance if the node degrees and the coupling width are chosen appropriately. But due to the strict constraint of maintaining a regular degree, there exist certain unfavorable rates that exhibit bad performance and high decoding complexity. We introduce an altered LDPC ensemble construction that changes the evolution of degrees over subsequent incremental redundancy steps in such a way, that the degrees can be kept low to achieve outstanding performance close to Shannon limit for all rates. These ensembles always outperform their regular counterparts at small coupling width.},
  author       = {Nitzold, Walter and Lentmaier, Michael and Fettweis, Gerhard},
  keyword      = {incremental redundancy,spatially coupled codes,spatial coupling,LDPC codes,rate-compatible},
  language     = {eng},
  pages        = {5},
  publisher    = {ARRAY(0x9c584e8)},
  series       = {[Host publication title missing]},
  title        = {Rate-Compatible Spatially-Coupled LDPC Code Ensembles With Nearly-Regular Degree Distributions},
  year         = {2015},
}