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Error floor Analysis of LT Codes over the Additive White Gaussian Noise Channel
KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0002-5407-0835
KTH, School of Electrical Engineering (EES), Communication Theory. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0001-7182-9543
2011 (English)In: 2011 IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE (GLOBECOM 2011) , IEEE , 2011, 6133650- p.Conference paper, Published paper (Refereed)
Abstract [en]

We investigate the error floor performance of Luby Transform (LT) codes over the additive white Gaussian noise channel. We first derive a lower bound on the bit error rate for an LT code, which we subsequently use to show that the corresponding error floor is predominantly caused by low-degree variable nodes. Based on this observation, we propose a modified encoding scheme for LT codes that provides a lower error floor with no increase in encoding and decoding complexities. The convergence behavior of the proposed scheme is analyzed using extrinsic information transfer charts, and shown to be similar to the original LT code. Numerical examples demonstrate the improvements of the modified LT code as a stand-alone code and as a component code of a Raptor code.

Place, publisher, year, edition, pages
IEEE , 2011. 6133650- p.
Series
Globecom. IEEE Conference and Exhibition, ISSN 1930-529X
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-63207DOI: 10.1109/GLOCOM.2011.6133650ISI: 000300509000148Scopus ID: 2-s2.0-84857218656ISBN: 978-1-4244-9268-8 (print)OAI: oai:DiVA.org:kth-63207DiVA: diva2:481801
Conference
54th Annual IEEE Global Telecommunications Conference: 'Energizing Global Communications', GLOBECOM 2011;Houston, TX;5 December 2011through9 December 2011
Note

QC 20120206

Available from: 2012-01-22 Created: 2012-01-22 Last updated: 2012-10-23Bibliographically approved

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Xiao, MingRasmussen, Lars Kildehöj

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