Design of Multi-Edge-Type Bilayer-Expurgated LDPC Codes for Decode-and-Forward in Relay Channels
2011 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 59, no 11, 2993-3006 p.Article in journal (Refereed) Published
We consider the design of bilayer-expurgated low-density parity-check (BE-LDPC) codes as part of a decode-and-forward protocol for use over the full-duplex relay channel. A new ensemble of codes, termed multi-edge-type bilayer-expurgated LDPC (MET-BE-LDPC) codes, is introduced where the BE-LDPC code design problem is transformed into the problem of optimizing the multinomials of a multi-edge-type LDPC code. We propose two design strategies for optimizing MET-BE-LDPC codes; the bilayer approach is preferred when the difference in SNR between the source-to-relay and the source-to-destination channels is small, while the bilayer approach with intermediate rates is preferred when this difference is large. In both proposed design strategies multi-edge-type density evolution is used for code optimization. The resulting MET-BE-LDPC codes exhibit improved threshold and bit-error-rate performance as compared to previously reported bilayer LDPC codes.
Place, publisher, year, edition, pages
2011. Vol. 59, no 11, 2993-3006 p.
Multi-edge type LDPC codes, bilayer LDPC codes, density evolution, decode-and-forward, relay channel
IdentifiersURN: urn:nbn:se:kth:diva-55254DOI: 10.1109/TCOMM.2011.100411.100286ISI: 000297589000012ScopusID: 2-s2.0-82455167947OAI: oai:DiVA.org:kth-55254DiVA: diva2:471511
FunderEU, European Research Council, FP7/2007-2013 228044Swedish Research Council, 621-2009-4666
QC 201201022012-01-022012-01-022012-03-29Bibliographically approved