Bilayer LDPC Convolutional Codes for Decode-and-Forward Relaying
2013 (English)In: IEEE Transactions on Communications, ISSN 0090-6778, E-ISSN 1558-0857, Vol. 61, no 8, 3086-3099 p.Article in journal (Refereed) Published
In this paper we present bilayer LDPC convolutional codes for half-duplex relay channels. Two types of codes, bilayer expurgated LDPC convolutional codes and bilayer lengthened LDPC convolutional codes, are proposed for decode-and-forward (DF) relaying. In the case of the binary erasure relay channel, we prove analytically that both code constructions achieve the capacities of the source-relay link and the source-destination link simultaneously, provided that the channel conditions are known when designing the codes. Meanwhile, both codes enable the highest transmission rate possible with DF relaying for a wide range of channel parameters. In addition, the regular degree distributions can easily be computed from the channel parameters, which significantly simplifies the code optimization. The code construction and performance analysis are extended to the general binary memoryless symmetric channel, where a capacity-achieving performance is conjectured. Numerical results are provided for both types of codes with finite node degrees over binary erasure channels and binary-input additive white Gaussian noise channels, which verify the aforementioned theoretical analysis.
Place, publisher, year, edition, pages
2013. Vol. 61, no 8, 3086-3099 p.
Low-density parity-check (LDPC) codes, LDPC convolutional codes, relay channel, decode-and-forward, cooperative communication
Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications
IdentifiersURN: urn:nbn:se:kth:diva-129466DOI: 10.1109/TCOMM.2013.061013.120122ISI: 000323647500002ScopusID: 2-s2.0-84883276240OAI: oai:DiVA.org:kth-129466DiVA: diva2:653511
FunderEU, FP7, Seventh Framework Programme, 257626Swedish Foundation for Strategic Research
QC 201310042013-10-042013-09-302013-10-04Bibliographically approved