Performance analysis of serial relay orbital satellite optical communication over turbulent channels

Ali Refaai; Fatma Newagy; Mohamed Fathy Abo Sree; Hadia Elhennawy; Moustafa H Aly; Mohamed Abaza

doi:10.1364/OL.461652

Optics Letters
Vol. 47,
Issue 11,
pp. 2887-2890
(2022)
•https://doi.org/10.1364/OL.461652

Performance analysis of serial relay orbital satellite optical communication over turbulent channels

Ali Refaai, Fatma Newagy, Mohamed Fathy Abo Sree, Hadia Elhennawy, Moustafa H Aly, and Mohamed Abaza

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Ali Refaai, Fatma Newagy, Mohamed Fathy Abo Sree, Hadia Elhennawy, Moustafa H Aly, and Mohamed Abaza, "Performance analysis of serial relay orbital satellite optical communication over turbulent channels," Opt. Lett. 47, 2887-2890 (2022)

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Table of Contents Category
- Fiber Optics and Optical Communications
Optics & Photonics Topics
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The topics in this list come from the Optics and Photonics Topics applied to this article.

About this Article
History
- Original Manuscript: April 25, 2022
- Revised Manuscript: May 13, 2022
- Manuscript Accepted: May 13, 2022
- Published: May 31, 2022

Abstract

Optical space communication has been proven to be a reliable relay satellite transmission system. The difficulty that occurs in RF satellite communication (SatCom) can be alleviated by using free-space optical (FSO) or laser SatCom. In this work, we analyze a proposed laser downlink relay SatCom model with existing channel turbulence employing intensity modulation and direct detection (IM/DD), and amplify-and-forward (AF) technology and compare it with the optical direct link SatCom. Accounting for atmospheric attenuation and turbulence, the effect of model parameters such as zenith angle, receiver aperture radius, best number of optical ground stations (OGSs), and end-to-end operating wavelength on system performance is investigated for different OGS height scenarios. We provide exact closed-form expressions for the proposed model and optimize system performance by selecting the best number of OGSs using a selective diversity technique that can boost the system signal-to-noise (SNR) by up to 37 dB (99.9%).

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Values	Visibility Range (km)
1.6	$V > 50$
1.3	$6 < V < 50$
$1.6 V + 0.34$	$1 < V < 6$
$V - 0.5$	$0.5 < V < 1$
0	$V > 0.5$

Name	Symbol	Values
Total propagation distance	$L$	$38,000$ km
Zenith angle	$ξ$	$15^{\circ}$ , $40^{\circ}$ , $50^{\circ}$
Ground wind speed	$v_{g}$	30 m/s
Height of the OGS above sea level	$h_{E}$	0, 1.2 km
Height of the GS above ground level	$h_{0}$	0, 1 km
Threshold of acceptable quality	$γ_{t h}$	7 dB
Pointing error standard deviation	$θ_{p}$	$10$ $μ$ rad
Half beam divergence angle	$θ_{d}$	$1$ mrad
Responsivity	$R$	0.8
Bandwidth	$B_{e}$	$1$ Gbps
Gaussian noise variance	$N_{0} / 2$	$- 150$ dBm
Relay received aperture radius	$a$	$30$ cm
Direct link atmospheric path loss	$h^{-}$	0.1
Direct link small-scale turbulence	$α$	5.45
Direct link large-scale turbulence	$β$	3.83

Parameter	S.R.	D.L.	$%$ Enhancement
Required SNR	73 dB	76 dB	49.8 $%$
Site div. SNR	39 dB	76 dB	99.9 $%$

Values	Visibility Range (km)
1.6	$V > 50$
1.3	$6 < V < 50$
$1.6 V + 0.34$	$1 < V < 6$
$V - 0.5$	$0.5 < V < 1$
0	$V > 0.5$

Name	Symbol	Values
Total propagation distance	$L$	$38,000$ km
Zenith angle	$ξ$	$15^{\circ}$ , $40^{\circ}$ , $50^{\circ}$
Ground wind speed	$v_{g}$	30 m/s
Height of the OGS above sea level	$h_{E}$	0, 1.2 km
Height of the GS above ground level	$h_{0}$	0, 1 km
Threshold of acceptable quality	$γ_{t h}$	7 dB
Pointing error standard deviation	$θ_{p}$	$10$ $μ$ rad
Half beam divergence angle	$θ_{d}$	$1$ mrad
Responsivity	$R$	0.8
Bandwidth	$B_{e}$	$1$ Gbps
Gaussian noise variance	$N_{0} / 2$	$- 150$ dBm
Relay received aperture radius	$a$	$30$ cm
Direct link atmospheric path loss	$h^{-}$	0.1
Direct link small-scale turbulence	$α$	5.45
Direct link large-scale turbulence	$β$	3.83

Abstract

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Figures (5)

Tables (3)

Equations (5)

Optics Letters