Finite-SNR diversity gain analysis of FSO systems over gamma-gamma fading channels with pointing errors

Mohammed Elamassie; Sadiq M. Sait; Murat Uysal

doi:10.1109/LCOMM.2021.3061775

Finite-SNR diversity gain analysis of FSO systems over gamma-gamma fading channels with pointing errors

Mohammed Elamassie, Sadiq M. Sait, Murat Uysal

Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English (US)
Article number	9361579
Pages (from-to)	1940-1944
Number of pages	5
Journal	IEEE Communications Letters
Volume	25
Issue number	6
DOIs	https://doi.org/10.1109/LCOMM.2021.3061775
State	Published - Jun 2021

Keywords

Free-space optical communication
diversity order
finite-SNR
gamma-gamma fading

ASJC Scopus subject areas

Modeling and Simulation
Computer Science Applications
Electrical and Electronic Engineering

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10.1109/LCOMM.2021.3061775

Cite this

@article{e71431542bc6480da5161f6e8fd14535,

title = "Finite-SNR diversity gain analysis of FSO systems over gamma-gamma fading channels with pointing errors",

abstract = "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.",

keywords = "Free-space optical communication, diversity order, finite-SNR, gamma-gamma fading",

author = "Mohammed Elamassie and Sait, {Sadiq M.} and Murat Uysal",

note = "Funding Information: Manuscript received February 12, 2021; accepted February 20, 2021. Date of publication February 24, 2021; date of current version June 10, 2021. The work of Murat Uysal is supported by the Turkish Scientific and Research Council under Grant 120E312. This work is also supported by the Deanship of Scientific Research, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia, under Project Number SB191038. The associate editor coordinating the review of this letter and approving it for publication was X. Lei. (Corresponding author: Mohammed Elamassie.) Mohammed Elamassie and Murat Uysal are with the Department of Electrical and Electronics Engineering, {\"O}zyegˇin University, 34794 Istanbul, Turkey (e-mail: mohammed.elamassie@ozyegin.edu.tr; murat.uysal@ozyegin.edu.tr). Publisher Copyright: {\textcopyright} 1997-2012 IEEE.",

year = "2021",

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N1 - Funding Information: Manuscript received February 12, 2021; accepted February 20, 2021. Date of publication February 24, 2021; date of current version June 10, 2021. The work of Murat Uysal is supported by the Turkish Scientific and Research Council under Grant 120E312. This work is also supported by the Deanship of Scientific Research, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia, under Project Number SB191038. The associate editor coordinating the review of this letter and approving it for publication was X. Lei. (Corresponding author: Mohammed Elamassie.) Mohammed Elamassie and Murat Uysal are with the Department of Electrical and Electronics Engineering, Özyegˇin University, 34794 Istanbul, Turkey (e-mail: mohammed.elamassie@ozyegin.edu.tr; murat.uysal@ozyegin.edu.tr). Publisher Copyright: © 1997-2012 IEEE.

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N2 - 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.

AB - 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.

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Finite-SNR diversity gain analysis of FSO systems over gamma-gamma fading channels with pointing errors

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