Rate-Compatible Spatially-Coupled LDPC Code Ensembles With Nearly-Regular Degree Distributions
Författare
Summary, in English
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.
Avdelning/ar
Publiceringsår
2015
Språk
Engelska
Sidor
41-45
Publikation/Tidskrift/Serie
2015 IEEE International Symposium on Information Theory (ISIT)
Fulltext
- Available as PDF - 255 kB
- Download statistics
Dokumenttyp
Konferensbidrag
Förlag
IEEE - Institute of Electrical and Electronics Engineers Inc.
Ämne
- Electrical Engineering, Electronic Engineering, Information Engineering
Nyckelord
- incremental redundancy
- spatially coupled codes
- spatial coupling
- LDPC codes
- rate-compatible
Conference name
IEEE International Symposium on Information Theory (ISIT), 2015
Conference date
2015-06-14 - 2015-06-19
Conference place
Hong Kong, China
Status
Published
Forskningsgrupp
- Telecommunication Theory
ISBN/ISSN/Övrigt
- ISBN: 978-1-4673-7704-1