Secrecy performance of mixed single-input multiple-output-FSO/single-input multiple-output-RF networks with energy harvesting

Wanxin He; Jiliang Zhang

doi:10.1364/AO.440162

Applied Optics
Vol. 60,
Issue 36,
pp. 11010-11017
(2021)
•https://doi.org/10.1364/AO.440162

Secrecy performance of mixed single-input multiple-output-FSO/single-input multiple-output-RF networks with energy harvesting

Wanxin He and Jiliang Zhang

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Wanxin He and Jiliang Zhang, "Secrecy performance of mixed single-input multiple-output-FSO/single-input multiple-output-RF networks with energy harvesting," Appl. Opt. 60, 11010-11017 (2021)

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Table of Contents Category
- Fiber Optics, Fiber Sensors, and Optical Communications
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About this Article
History
- Original Manuscript: August 9, 2021
- Revised Manuscript: November 19, 2021
- Manuscript Accepted: November 19, 2021
- Published: December 13, 2021

Abstract

In this paper, we study the secrecy performance of an energy-harvested relaying assisted free space optical–radio frequency (FSO-RF) network. In particular, a single-beam source sends an optical signal to a multi-aperture relay over an FSO channel, and then the relay converts it into an RF signal and adopts a decode-and-forward protocol to forward it to a multi-antenna destination under the wiretapping of a multi-antenna eavesdropper. We assume that the relay is power constrained, and it requires to harvest energy from a power beacon to assist the information transmission. It is also assumed that the FSO link and all RF links are subject to gamma–gamma fading with atmospheric turbulence and Rayleigh fading, respectively. Analytical expressions for secrecy outage probability (SOP) and the probability of strictly positive secrecy capacity are derived. In addition, the asymptotic expression for SOP is obtained to present insight into secrecy performance at high signal-to-noise ratio regimes. Finally, Monte Carlo simulations verify the correctness of the theoretical derivations.

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Data Availability

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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Parameter	Symbol	Values
Average channel power gain	$g_{B R}$	1
AWGN variance at R	$N_{0}$	1
AWGN variances at D and E	$N_{D}$ and $N_{E}$	1
Average SNR from PB	$P_{B} / N_{0}$	10 dB
Wavelength	$λ$	1550 nm
Refractive index	$C_{n}^{2}$	$1.7 \times 10^{- 14}$
Diameter of the receiver aperture	$D$	20 cm
Link length	$L$	3, 4, and 6 (km)
Log irradiance variance	$σ^{2}$	1.03, 1.75, and 3.67

Atmospheric Turbulence	Parameter Values
Weak turbulence	$L = 3 k m$ , $σ^{2} = 1.03$ , $α = 2.902 β = 2.510$
Moderate turbulence	$L = 4 k m$ , $σ^{2} = 1.75$ , $α = 2.296 β = 1.822$
Strong turbulence	$L = 6 k m$ , $σ^{2} = 3.67$ , $α = 2.064 β = 1.342$

Parameter	Symbol	Values
Average channel power gain	$g_{B R}$	1
AWGN variance at R	$N_{0}$	1
AWGN variances at D and E	$N_{D}$ and $N_{E}$	1
Average SNR from PB	$P_{B} / N_{0}$	10 dB
Wavelength	$λ$	1550 nm
Refractive index	$C_{n}^{2}$	$1.7 \times 10^{- 14}$
Diameter of the receiver aperture	$D$	20 cm
Link length	$L$	3, 4, and 6 (km)
Log irradiance variance	$σ^{2}$	1.03, 1.75, and 3.67

Atmospheric Turbulence	Parameter Values
Weak turbulence	$L = 3 k m$ , $σ^{2} = 1.03$ , $α = 2.902 β = 2.510$
Moderate turbulence	$L = 4 k m$ , $σ^{2} = 1.75$ , $α = 2.296 β = 1.822$
Strong turbulence	$L = 6 k m$ , $σ^{2} = 3.67$ , $α = 2.064 β = 1.342$

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Equations (36)

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