Author
Elamassie, Mohammed, Sait, S. M., Uysal, Murat
Publication Date
2021-06
Publication Place
-
IEEE
Subject
Diversity order, Finite-SNR, Free-space optical communication, Gamma-gamma fading
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
1089-7798
Record ID
2e105940-3002-48ca-beaf-f5305d136475
Library Location
Electrical & Electronics Engineering
Date
2021-06
Notes
TÜBİTAK ; Deanship of Scientific Research, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia
Sample Text
Free space optical (FSO) communication systems are subject to turbulence-induced fading as a result of fluctuations in the refractive index. Gamma-Gamma (GG) distribution is commonly used in the literature to characterize moderate-to-strong turbulence conditions. The performance of FSO systems is further degraded by pointing error-induced fading as a result of building sways. While the asymptotic analysis presented in earlier works is important to understand the maximum diversity gains of FSO systems attainable over fading channels, such gains might not be available in practical range of signal-to-noise ratio (SNR). Furthermore, different systems with the same asymptotic slope may have different slopes in the range of finite SNR values. In this paper, we consider a multiple-input multiple-output (MIMO) FSO system with intensity modulation and direct detection (IM/DD). We derive approximate expression for the finite-SNR diversity order over GG turbulence channels in the presence of pointing errors. We also investigate convergence speed to full diversity. We provide numerical results to demonstrate the accuracy of our derivations and corroborate on our analytical findings.
DOI
10.1109/LCOMM.2021.3061775
Cilt
25
