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Optimal Power Control for LDPC Codes in Block-Fading Channels
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: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 59, no 7, 1759-1765 p.Article in journal (Refereed) Published
Abstract [en]

We study the error probability of LDPC codes in delay-limited block-fading channels with channel state information (CSI) at the transmitter and the receiver. We derive the optimal power allocation algorithms for LDPC codes with specific degree distributions using multi-edge-type density evolution error boundaries. The resulting performance approaches the outage probability for a number of power constraints. Furthermore, we adapt the algorithm for finite-length codes and show that the proposed algorithm enables gains larger than 10 dB over uniform power allocation. The method is valid for general, possibly correlated, fading distributions. This represents the first analysis of specific LDPC codes over block-fading channels with full CSI.

Place, publisher, year, edition, pages
2011. Vol. 59, no 7, 1759-1765 p.
Keyword [en]
Low-density parity-check (LDPC) codes, block-fading channel, power allocation, outage probability, density evolution
National Category
Computer and Information Science
URN: urn:nbn:se:kth:diva-38928DOI: 10.1109/TCOMM.2011.051311.090238ISI: 000293659600002ScopusID: 2-s2.0-79960561220OAI: diva2:438704
Swedish Research Council, 621-2009-4666EU, European Research Council, 228044ICT - The Next Generation
QC 20110905Available from: 2011-09-05 Created: 2011-09-05 Last updated: 2012-03-29Bibliographically approved

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Rasmussen, Lars Kildehöj
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