Optimal Power Control for LDPC Codes in Block-Fading Channels
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
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.
Low-density parity-check (LDPC) codes, block-fading channel, power allocation, outage probability, density evolution
Computer and Information Science
IdentifiersURN: urn:nbn:se:kth:diva-38928DOI: 10.1109/TCOMM.2011.051311.090238ISI: 000293659600002ScopusID: 2-s2.0-79960561220OAI: oai:DiVA.org:kth-38928DiVA: diva2:438704
FunderSwedish Research Council, 621-2009-4666EU, European Research Council, 228044ICT - The Next Generation
QC 201109052011-09-052011-09-052012-03-29Bibliographically approved