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The Scientific World Journal
Volume 2014 (2014), Article ID 213834, 7 pages
http://dx.doi.org/10.1155/2014/213834
Research Article

Improved BDF Relaying Scheme Using Time Diversity over Atmospheric Turbulence and Misalignment Fading Channels

1Department of Communications Engineering, University of Málaga, 29071 Málaga, Spain
2Department of Statistics and Operations Research, University of Málaga, 29071 Málaga, Spain

Received 21 August 2013; Accepted 31 October 2013; Published 22 January 2014

Academic Editors: A. Dalla Mora and B. Wei

Copyright © 2014 Antonio García-Zambrana 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

A novel bit-detect-and-forward (BDF) relaying scheme based on repetition coding with the relay is proposed, significantly improving the robustness to impairments proper to free-space optical (FSO) communications such as unsuitable alignment between transmitter and receiver as well as fluctuations in the irradiance of the transmitted optical beam due to the atmospheric turbulence. Closed-form asymptotic bit-error-rate (BER) expressions are derived for a 3-way FSO communication setup. Fully exploiting the potential time-diversity available in the relay turbulent channel, a relevant better performance is achieved, showing a greater robustness to the relay location since a high diversity gain is provided regardless of the source-destination link distance.