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dc.contributor.authorde Baynast, Alexandre
Sabharwal, Ashutosh
Aazhang, Behnaam
dc.creatorde Baynast, Alexandre
Sabharwal, Ashutosh
Aazhang, Behnaam
dc.date.accessioned 2007-10-31T00:41:51Z
dc.date.available 2007-10-31T00:41:51Z
dc.date.issued 2005-07-01
dc.date.submitted 2005-07-01
dc.identifier.citation A. de Baynast, A. Sabharwal and B. Aazhang, "LDPC Code Design for OFDM Channel: Graph Connectivity and Information Bits Positioning," vol. 2, 2005.
dc.identifier.urihttps://hdl.handle.net/1911/19837
dc.description Conference Paper
dc.description.abstract We 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.
dc.language.iso eng
dc.subjectLDPC codes
OFDM system
Factor Graph
Density Evolution Algorithm
dc.title LDPC Code Design for OFDM Channel: Graph Connectivity and Information Bits Positioning
dc.type Conference paper
dc.date.note 2005-06-22
dc.citation.bibtexName inproceedings
dc.date.modified 2005-12-09
dc.contributor.orgCenter for Multimedia Communications (http://cmc.rice.edu/)
dc.subject.keywordLDPC codes
OFDM system
Factor Graph
Density Evolution Algorithm
dc.citation.volumeNumber 2
dc.citation.location Iasi, Romania
dc.citation.conferenceName IEEE International Symposium on Signals, Circuits and Systems
dc.type.dcmi Text
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1109/ISSCS.2005.1511324
dc.citation.firstpage 649
dc.citation.lastpage 652


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    Publications by Rice University Electrical and Computer Engineering faculty and graduate students

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