Approximation to the Sum of Two Correlated Gamma-Gamma Variates and its Applications in Free-Space Optical Communications

Yang, Guowei, Khalighi, Mohammad-Ali, Bourennane, Salah and Ghassemlooy, Zabih (2012) Approximation to the Sum of Two Correlated Gamma-Gamma Variates and its Applications in Free-Space Optical Communications. IEEE Wireless Communications Letters, 1 (6). pp. 621-624. ISSN 2162-2337

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Official URL: http://dx.doi.org/10.1109/WCL.2012.091312.120469

Abstract

The Gamma-Gamma (ΓΓ) distribution is popularly accepted for modeling the received intensity fluctuations in the near-ground free-space optical (FSO) communication. We consider in this letter the case of dual space diversity FSO systems when the fading coefficients corresponding to the two sub-channels are correlated. In order to evaluate the receiver performance analytically, we propose to approximate the sum of correlated ΓΓ random variables by an α-μ distribution. We show that there is a good match between the performance obtained by simulated data based on the ΓΓ channel model and that obtained from analytical calculation based on the approximate α-μ model.

Item Type: Article
Uncontrolled Keywords: α-μ distribution, Gamma-gamma distribution, correlated fading, free-space optics (FSO), spatial diversity
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 24 Apr 2014 14:04
Last Modified: 10 Aug 2015 11:12
URI: http://nrl.northumbria.ac.uk/id/eprint/16124

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