A Simple, Accurate Approximation to the Sum of Gamma-Gamma Variates and Applications in MIMO Free-Space Optical Systems

被引：65
|
作者：
Peppas, Kostas P. [1 ]
机构：
[1] Demokritos Natl Ctr Sci Res, Inst Informat & Telecommun, Lab Mobile Commun, GR-15310 Athens, Greece
来源：
IEEE PHOTONICS TECHNOLOGY LETTERS | 2011年 / 23卷 / 13期
关键词：
Free-space optics (FSO); gamma-gamma (G-G) distribution; multiple-input multiple-output (MIMO) systems; alpha-mu distribution; PERFORMANCE;
D O I：
10.1109/LPT.2011.2135342
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this letter, we propose a simple accurate closed-form approximation to the probability density function (pdf) of the sum of independent, identically distributed gamma-gamma (G-G) random variables. It is shown that the pdf of the G-G sum can be efficiently approximated by the pdf of an alpha-mu distribution. Based on this approach, simple precise approximations for important performance metrics of multiple-input multiple-output (MIMO) free-space optical systems operating over G-G fading are presented. The accuracy of the proposed method is substantiated by various numerically evaluated and computer simulation results.
引用
收藏
页码：839 / 841
页数：3
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