Open Access

Nonregenerative Dual-Hop Cooperative Links with Selection Diversity

  • Theodoros A Tsiftsis1Email author,
  • George K Karagiannidis2,
  • P Takis Mathiopoulos3 and
  • Stavros A Kotsopoulos1
EURASIP Journal on Wireless Communications and Networking20062006:017862

Received: 1 November 2005

Accepted: 17 May 2006

Published: 25 June 2006


The end-to-end performance of dual-hop cooperative diversity systems equipped with nonregenerative relays and a selection combining receiver at the destination terminal over independent and nonidentical Nakagami- fading channels is studied. Closed-form expressions for the cumulative distribution function and the probability density function of the end-to-end signal-to-noise ratio ( ) are presented, while analytical formulae are derived for the moments and the moment generating function. Using these statistical results, closed-form expressions for the outage probability are presented for both channel state information and fixed gain relays. Furthermore, for the case of fixed gain relay, the average end-to-end , the amount of fading, and the average bit error rate can be numerically evaluated. The proposed mathematical analysis is complemented by numerical examples, including the effects on the overall performance of the s unbalancing as well as the fading severity.


Authors’ Affiliations

Department of Electrical & Computer Engineering, University of Patras
Department of Electrical & Computer Engineering, Aristotle University of Thessaloniki
Institute for Space Applications and Remote Sensing (ISARS), National Observatory of Athens


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© Theodoros A. Tsiftsis et al. 2006

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.