Compress-and-forward relaying based on symbol-wise joint source-channel coding
2010 (English)In: IEEE International Conference on Communications, IEEE conference proceedings, 2010, 1-5 p.Conference paper (Refereed)
We propose a new compress-and-forward implementation for the relay channel based on joint source-channel coding techniques. The relay performs scalar quantization of its observation in combination with a redundant index mapping. Our system utilizes the correlation between the quantized signal and the direct-link observation of the transmitted symbols as redundancy for error protection on the relay-to-destination link. In order to fully exploit this correlation the destination requires iterative decoding to recover the quantized observation sent by the relay. Once regenerated, this quantized signal is optimally combined with the direct-link observation to decode the message conveyed by the source. By quantizing the observed signal itself rather than a measure on the reliability of the information bits (e.g. a posteriori probabilities from a decoder), and by using digital communication methods on the relay-to-destination link our system yields superior performance to that of amplify-and-forward, decode-and-forward and previous implementations of compress-and-forward based on soft decoding.
Place, publisher, year, edition, pages
IEEE conference proceedings, 2010. 1-5 p.
, IEEE International Conference on Communications, ISSN 1550-3607
A-posteriori probabilities, Amplify-and-forward, Compress and forward, Decode-and-forward, Digital communications, Error protection, Information bit, Joint source-channel coding, Quantized observations, Relay channels, Scalar quantization, Soft decoding, Channel coding, Digital communication systems, Iterative decoding
IdentifiersURN: urn:nbn:se:kth:diva-30307DOI: 10.1109/ICC.2010.5501855ISI: 000290335600119ScopusID: 2-s2.0-77955356251ISBN: 978-1-4244-6404-3OAI: oai:DiVA.org:kth-30307DiVA: diva2:404709
2010 IEEE International Conference on Communications, ICC 2010; Cape Town; 23 May 2010 through 27 May 2010
FunderEU, FP7, Seventh Framework Programme, 216076
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QC 201103182012-01-172011-02-232012-01-17Bibliographically approved