Performance analysis of incremental-best-relay amplify-and-forward technique

Authors:
Salama S. Ikki;Murat Uysal;Mohamed H. Ahmed
Affiliations:
Department of Electrical and Computer, University of Waterloo, Waterloo, Ontario, Canada;Department of Electrical and Computer, University of Waterloo, Waterloo, Ontario, Canada;Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. Johns, Newfoundland, Canada
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

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Abstract

In this paper, we investigate amplify-and-forward (AF) incremental-best-relay cooperative diversity to make efficient use of the channel spectrum by exploiting a limited feedback from the destination terminal, e.g., a single bit indicating the success or failure of the direct transmission. If the destination provides a negative acknowledgment via feedback; in this case only, the best relay among M available relays retransmits the source signal in an attempt to exploit spatial diversity by combining the signals received at the destination from the source and the best relay. Closed-form expressions for the bit error rate, the outage probability and average channel capacity are determined over independent non-identical Rayleigh fading channels. Results show that the AF incremental-best-relay cooperative diversity can achieve the maximum possible diversity order, compared with the conventional cooperative-diversity networks, with higher channel utilization. In particular, the AF incremental-best-relay technique can achieve M + 1 diversity order at low signal-to noise ratio (SNR) and and exhibits a 20 to 30 dB gain relative to direct transmission, assuming single-antenna terminals at high SNR.