LDPC Code Design for OFDM Channel: Graph Connectivity and Information Bits Positioning

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dc.citation.bibtexNameinproceedingsen_US
dc.citation.conferenceNameIEEE International Symposium on Signals, Circuits and Systemsen_US
dc.citation.firstpage649
dc.citation.lastpage652
dc.citation.locationIasi, Romaniaen_US
dc.citation.volumeNumber2en_US
dc.contributor.authorde Baynast, Alexandreen_US
dc.contributor.authorSabharwal, Ashutoshen_US
dc.contributor.authorAazhang, Behnaamen_US
dc.contributor.orgCenter for Multimedia Communications (http://cmc.rice.edu/)en_US
dc.date.accessioned2007-10-31T00:41:51Z
dc.date.available2007-10-31T00:41:51Z
dc.date.issued2005-07-01
dc.date.modified2005-12-09en_US
dc.date.note2005-06-22en_US
dc.date.submitted2005-07-01en_US
dc.descriptionConference Paperen_US
dc.description.abstractWe present an optimized channel coding scheme for OFDM transmission. In the future wireless standards such IEEE 802.11n, frame error rates (FER) as low as 0.0001 are targeting. Irregular LDPC codes have excellent performance at moderate computational complexity: they are strong candidates for channel coding in such systems. In the context of an OFDM transmission, the authors in [Mannoni, 2002] proposed to optimize the graph connectivity of the irregular LDPC code accordingly to the channel spectrum. However, their codes did not have good performance for a FER range of 0.001 - 0.0001. In this paper, we propose to optimize the LDPC code in two steps: first, we optimize the graph connectivity in order to get a minimum operational average SNR and therefore excellent FER; then we optimize the information bits placement accordingly to the channel. By simulation, we show that our approach provides substantial performance gain in term of FER over the existing methods (1 dB or more for FER equal to 10e-4.en_US
dc.identifier.citationA. de Baynast, A. Sabharwal and B. Aazhang, "LDPC Code Design for OFDM Channel: Graph Connectivity and Information Bits Positioning," vol. 2, 2005.
dc.identifier.doihttp://dx.doi.org/10.1109/ISSCS.2005.1511324en_US
dc.identifier.urihttps://hdl.handle.net/1911/19837
dc.language.isoeng
dc.subjectLDPC codes*
dc.subjectOFDM system*
dc.subjectFactor Graph*
dc.subjectDensity Evolution Algorithm*
dc.subject.keywordLDPC codesen_US
dc.subject.keywordOFDM systemen_US
dc.subject.keywordFactor Graphen_US
dc.subject.keywordDensity Evolution Algorithmen_US
dc.titleLDPC Code Design for OFDM Channel: Graph Connectivity and Information Bits Positioningen_US
dc.typeConference paper
dc.type.dcmiText
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