Performance analysis of space-diversity free-space optical systems over the correlated Gamma-Gamma fading channel using Pad?? approximation method

Author

Yang, Guo-Min ; Khalighi, Mohammad Ali ; Ghassemlooy, Zabih ; Bourennane, Salah

Author_Institution

Coll. of Commun. Eng., Hangzhou Dianzi Univ., Hangzhou, China

Volume

8

Issue

13

fYear

2014

fDate

September 5 2014

Firstpage

2246

Lastpage

2255

Abstract

We propose an analytical approach to evaluate the performance of space-diversity free-space optical (FSO) systems over correlated Gamma-Gamma (ΓΓ) fading channels. To do this, we firstly derive an infinite series representation for the moment generating function (MGF) of the sum of arbitrarily correlated ΓΓ random variables (RVs). Then, a closed-form approximate expression for the probability density function (PDF) of the sum of ΓΓ RVs is obtained from the MGF with the aid of Padé approximation. The performance of the FSO system is then evaluated based on this PDF. Through some numerical results we illustrate the accuracy of the proposed method and further discuss its limitations.

Keywords

approximation theory; diversity reception; fading channels; optical communication; probability; FSO systems; MGF; PDF; Padé approximation method; correlated Gamma-Gamma fading channel; inflnite series representation; moment generating function; performance analysis; probability density function; space-diversity free-space optical systems; sum-of-arbitrarily correlated ΓΓ random variables;

fLanguage

English

Journal_Title

Communications, IET

Publisher

iet

ISSN

1751-8628

Type

jour

DOI

10.1049/iet-com.2013.0962

Filename

6892152