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Improved design of unequal error protection LDPC codes
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
2010 (English)In: EURASIP Journal on Wireless Communications and Networking, ISSN 1687-1472, E-ISSN 1687-1499, Vol. 2010Article in journal (Refereed) Published
Abstract [en]

We propose an improved method for designing unequal error protection (UEP) low-density parity-check (LDPC) codes. The method is based on density evolution. The degree distribution with the best UEP properties is found, under the constraint that the threshold should not exceed the threshold of a non-UEP code plus some threshold offset. For different codeword lengths and different construction algorithms, we search for good threshold offsets for the UEP code design. The choice of the threshold offset is based on the average a posteriori variable node mutual information. Simulations reveal the counter intuitive result that the short-to-medium length codes designed with a suitable threshold offset all outperform the corresponding non-UEP codes in terms of average bit-error rate. The proposed codes are also compared to other UEP-LDPC codes found in the literature

Place, publisher, year, edition, pages
2010. Vol. 2010
National Category
Signal Processing
Research subject
Signal Processing
Identifiers
URN: urn:nbn:se:ltu:diva-4637DOI: 10.1155/2010/423989Local ID: 29c94ffa-623b-4c72-8b8b-b7207dd8b1fbOAI: oai:DiVA.org:ltu-4637DiVA: diva2:977511
Note
Validerad; 2011; Bibliografisk uppgift: Article Number: 423989 ; 20110110 (saras)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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