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Regularized Variable-Node LT Codes with Improved Erasure Floor Performance
KTH, School of Electrical Engineering (EES), Communication Theory.
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-5407-0835
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0001-7182-9543
2013 (English)Conference paper, Published paper (Refereed)
Abstract [en]

We consider the use of extrinsic information transfercharts for the design of Luby Transform (LT) codes over thebinary erasure channel (BEC). In particular, we formulate anoptimization problem to determine asymptotically good check-node degree distributions in terms of decoder overhead. Wefurther propose a modified encoding scheme that maximizes theminimum variable-node degree, thus optimizing the erasure-floorperformance at the expense of decoder overhead, and resultingin a regularized variable-node degree distribution. The two ap-proaches are combined to jointly improve decoder overhead anddecoder erasure floor by incorporating the proposed encodingstrategy into the convex optimization problem. The performanceof the proposed schemes is investigated for transmission over theBEC through density evolution and numerical simulations. Theoptimized codes compare favorably to conventional LT codes,and are further extended to enable improved performance forunequal erasure protection.

Place, publisher, year, edition, pages
2013.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-145347OAI: oai:DiVA.org:kth-145347DiVA: diva2:717805
Conference
2013 Information Theory and Applications Workshop; San Diego, USA, 10-15 February, 2013
Note

QC 20140519

Available from: 2014-05-17 Created: 2014-05-17 Last updated: 2014-05-19Bibliographically approved

Open Access in DiVA

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Authority records BETA

Xiao, MingRasmussen, Lars K.

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
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Output format
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