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Journal of Computer Networks and CommunicationsVolume 2011 2011, Article ID 560528, 14 pages

Research Article

Broadband Wireless and Sensor Networks Laboratory, Athens Information Technology, 19.5 km Markopoulo Avenue, Peania, 19002 Athens, Greece

Department of Signals and Systems, Chalmers University of Technology, 412 96 Gothenburg, Sweden

School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK

Received 30 March 2011; Revised 28 June 2011; Accepted 4 August 2011

Academic Editor: W. Hamouda

Copyright © 2011 George C. Alexandropoulos et al. 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.

Abstract

Although relaying can be very beneficial for wireless systems, understanding which relaying schemes can achieve specific performance objectives under realistic fading is crucial. In this paper we present a general framework for modeling and evaluating the performance of dual-hop decode-and-forward DF relaying schemes over independent and not necessarily identically distributed INID Nakagami- fading channels. We obtain closed-form expressions for the statistics of the instantaneous output signal-to-noise ratio of repetitive transmission with selection diversity. Furthermore, we present a unified statistical overview of other three significant relaying schemes with DF, one based on repetitive transmission with maximal-ratio diversity and the other two based on relay selection RS. To compare the considered schemes, we present closed-form and analytical expressions for the outage probability and the average symbol error probability under various modulation methods, respectively. Importantly, it is shown that when the channel state information for RS is perfect, RS-based schemes always outperform repetitive ones. Furthermore, when the direct link between the source and the destination nodes is sufficiently strong, relaying may not result in any gains, and it should be switched off.





Autor: George C. Alexandropoulos, Agisilaos Papadogiannis, and Paschalis C. Sofotasios

Fuente: https://www.hindawi.com/



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