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IEEE Wireless Communications Letters

Secrecy Performance of FSO Using HD and IM/DD Detection Technique Over F-Distribution Turbulence Channel With Pointing Error

Liqiang Han, Yawei Wang, Xuemei Liu, Boyu Li

Published Aug 10, 2021• 23 citations
Publisher

Abstract

This work is concerned with the secrecy performance of a free-space optical (FSO) communication system over Fisher-Snedecor$\mathcal {F}$-distribution turbulence fading channel. Considering the influence of pointing error, atmospheric turbulence and different detection technique (i.e., the intensity modulation with direct detection and heterodyne detection), we derive the exact closed-form expressions for the average secrecy capacity (ASC), the secrecy outage probability (SOP) and the strictly positive secrecy capacity (SPSC) in terms of Meijer’s G-function. Furthermore, the asymptotic expression for SOP is analyzed as the electrical signal-to-noise ratio approaches infinity. Monte Carlo simulations are provided to validate analytical results.

DOI
10.1109/lwc.2021.3098305

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This work is concerned with the secrecy performance of a free-space optical (FSO) communication system over Fisher-SnedecorF\mathcal {F}F-distribution turbulence fading channel. Considering the influence of pointing error, atmospheric turbulence and different detection technique (i.e., the intensity modulation with direct detection and heterodyne detection), we derive the exact closed-form expressions for the average secrecy capacity (ASC), the secrecy outage probability (SOP) and the strictly positive secrecy capacity (SPSC) in terms of Meijer’s G-function. Furthermore, the asymptotic expression for SOP is analyzed as the electrical signal-to-noise ratio approaches infinity. Monte Carlo simulations are provided to validate analytical results.
In this paper, we study the secrecy performance of a mixed radio frequency-free space optical (RF-FSO) transmission systems. All RF links experience Nakagami-m fading and the FSO link experiences the Gamma-Gamma fading. The effect of pointing error and two types of detection techniques (i.e., heterodyne detection and intensity modulation with direct detection) are considered. We derive closed-form expressions for lower bound of the secrecy outage probability (SOP) and exact average secrecy capacity (ASC). Furthermore, by utilizing the expansion of Meijer's G-function, asymptotic results for SOP and ASC are derived when the electrical signal-to-noise ratio of the FSO link tends to infinity. Numerical and Monte Carlo simulation results are provided to verify the accuracy of our proposed results.
The security issue is investigated from a physical layer perspective in the context of free-space optical (FSO) communications. More precisely, the performance of secure FSO link with intensity modulation/direct detection over Málaga (M) atmospheric turbulence channels that accounts for pointing errors is addressed in this letter. The closed-form expressions for the average secrecy capacity, the secrecy outage probability and the strictly positive secrecy capacity are derived by considering the specific nature of FSO channels modeled by the general M distribution. Monte-Carlo simulations are provided to verify the accuracy of our derivations.
This paper investigates the physical layer security (PLS) of multi-aperture coherent free-space optical (FSO) systems with heterodyne detection over atmospheric turbulence-induced fading channels, while accounting for residual phase distortions after Zernike polynomial-based modal compensation. Unlike prior work focused primarily on intensity modulation/direct detection (IM/DD)-based FSO systems, this study considers coherent multi-aperture reception. Based on a Rician approximation of the turbulence-induced fading envelope, we derive an analytical approximation for the secrecy outage probability (SOP), a tractable semi-closed-form expression for the SOP lower bound, and a closed-form approximation for the strictly positive achievable secrecy rate probability. Moreover, high-SNR and low-SNR asymptotic analyses are presented to characterize the asymptotic secrecy behavior. The results show that the secrecy diversity order equals the number of receive apertures at the legitimate receiver, whereas, in the high-SNR regime at the legitimate receiver, the eavesdropper’s channel parameters affect the leading-order coefficient but not the decay exponent. Numerical results validate the proposed analytical approximations and asymptotic expressions and demonstrate that increasing the number of receive apertures at the legitimate receiver improves secrecy performance under various turbulence conditions.
In this paper, an artificial noise (AN) injection technique is incorporated in a free-space optical (FSO) communication system with the aim of enhancing the secrecy performance of the system. An intensity modulated direct detection (IM/DD) FSO link which is subjected to Malaga (M) distributed turbulence with pointing errors is considered in this paper. The performance of FSO systems is evaluated by deriving novel closed-form expressions for the secrecy outage probability (SOP), strictly positive secrecy capacity (SPSC), and throughput of the system. By formulating a constrained optimization problem, we discuss an optimal power allocation strategy for throughput maximization in the considered system. It is shown through the results that the proposed technique is very effective in improving the secrecy performance of FSO systems.
Nowadays, the hybrid automatic retransmission request (H-ARQ) protocols are prevalent in fifth-generation (5G) and beyond communications. The utilization of H-ARQ protocols is extended to free-space optical (FSO) communication systems to achieve a reliable link. In this paper, we investigate the secrecy performance of chase combining (CC) H-ARQ protocol in the presence of an eavesdropper. We present the closed-form expressions of the average secrecy capacity (ASC) and secrecy outage probability (SOP) of FSO systems over atmospheric turbulence-induced fading channels and different rounds of H-ARQ transmission. We also derive the conditional SOP and secrecy throughput of the considered FSO system. The expressions are valid for weak to strong atmospheric turbulence, intensity modulation direct detection, and different number of H-ARQ rounds. We have also validated our proposed results using Monte Carlo simulations.
Abstract Free space optical (FSO) communication is a promising candidate for the next generation (5G and beyond) wireless communication systems, due to its merits (i.e. low latency, high data rate, and license‐free band, among others). However, atmospheric turbulence (AT) as well as pointing error (PE) are two of the main challenges with FSO communication that affect its performance. Here, the exact closed‐form expression of the average secrecy capacity and secrecy outage probability under the composite effect of AT and non‐zero boresight PEs is evaluated. For all the regimes of the AT (weak to strong), a generalised Malaga distribution is used to model the channel fading gain of the FSO link. The expressions are generalised and valid for all turbulence, and are applicable for intensity modulation direct detection as well as heterodyne detection techniques.