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A shared-relay cooperative diversity scheme based on joint channel and network coding

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4 Author(s)
Xiaoyan Xu ; Institute for Digital Communications, Joint Research Institute for Signal & Image Processing, The University of Edinburgh, Scotland, UK ; Mark F. Flanagan ; Christian Koller ; Norbert Goertz

In cooperative communications, the technique of algebraic code superposition (or network coding) may efficiently utilize limited communications resources to produce spatial diversity. In this paper, we propose a simple cooperative diversity scheme for the scenario of two sources sharing a single relay. No cooperative coding is required at the sources, and only very simple interleave-and-superpose operations are performed at the relay. We propose a novel computationally efficient message passing algorithm at the destination's decoder which utilizes spatial diversity gathered over multiple transmission frames. We show that despite the simplicity of the proposed scheme, diversity gains are efficiently leveraged by the simple combination of channel coding at the sources and network coding at the relay.

Published in:

Information Theory and Its Applications, 2008. ISITA 2008. International Symposium on

Date of Conference:

7-10 Dec. 2008