Approaching the optimal diversity-multiplexing tradeoff in a four-node cooperative network

Authors:
Chao Wang;Yijia Fan;John S. Thompson;Mikael Skoglund;H. Vincent Poor
Affiliations:
School of Electrical Engineering, Royal Institute of Technology, Stockholm, Sweden;InterDigital LLC, New York, NY;Institute for Digital Communications, The University of Edinburgh, Edinburgh, UK;School of Electrical Engineering, Royal Institute of Technology, Stockholm, Sweden;Department of Electrical Engineering, Princeton, University, Princeton, NJ
Venue:
IEEE Transactions on Wireless Communications
Year:
2010

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Abstract

A novel cooperative diversity transmission protocol is proposed for a four-node network, in which a single-antenna source communicates with an N-antenna destination with the help of two K-antenna half-duplex decode-and-forward (DF) relays. The proposed shifted successive DF relaying (SSDFR) protocol asymptotically achieves the optimal diversity-multiplexing tradeoff (DMT) the system can provide. The resulting DMT performance does not require complex coding strategies at the relays, extremely strong or weak inter-relay channel conditions, or feedback from the destination to the source, which highlights the advantages of the proposed protocol over state of the art techniques.