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Al-Sadiq International Conference on Communication and Information Technology (AICCIT)

Security-Reliability Analysis of FSO Communications Over Generalized F Channel

Safa A. A. Mohammed, Wafaa Mohammed Ridha Shakir, Ahamed Al Hilli

Published Jul 4, 2023• 5 citations
Publisher

Abstract

This research paper investigates the security and reliability aspects of a multiuser free space optical (MU-FSO) system when exposed to eavesdropper attacks. The system experiences atmospheric turbulence, specifically generalized Fisher-Snedecor F turbulence, which leads to significant signal fading. To enhance the security and reliability of the MU-FSO system, the study employs three scheduling schemes: optimal scheduling (OS), round-robin scheduling (RS), and cumulative distribution function scheduling (CS). The paper derives precise expressions for the intercept probability (IP) and outage probability (OP) of the MU-FSO system to compare the performance of these opportunistic scheduling schemes considering the impact of atmospheric turbulence and path loss. Additionally, the paper presents simplified expressions for the asymptotic behavior of IP and OP with acceptable accuracy. Numerical results demonstrate how the performance of the MU-FSO system in terms of secrecy and reliability is influenced by factors such as the conditions of the main and wiretap channels, distances between legitimate users, the number of active users, and the power levels of the legitimate and eavesdropping links. Monte Carlo simulations are used to verify the correctness of the numerical results.

DOI
10.1109/aiccit57614.2023.10218177

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This research paper investigates the security and reliability aspects of a multiuser free space optical (MU-FSO) system when exposed to eavesdropper attacks. The system experiences atmospheric turbulence, specifically generalized Fisher-Snedecor F turbulence, which leads to significant signal fading. To enhance the security and reliability of the MU-FSO system, the study employs three scheduling schemes: optimal scheduling (OS), round-robin scheduling (RS), and cumulative distribution function scheduling (CS). The paper derives precise expressions for the intercept probability (IP) and outage probability (OP) of the MU-FSO system to compare the performance of these opportunistic scheduling schemes considering the impact of atmospheric turbulence and path loss. Additionally, the paper presents simplified expressions for the asymptotic behavior of IP and OP with acceptable accuracy. Numerical results demonstrate how the performance of the MU-FSO system in terms of secrecy and reliability is influenced by factors such as the conditions of the main and wiretap channels, distances between legitimate users, the number of active users, and the power levels of the legitimate and eavesdropping links. Monte Carlo simulations are used to verify the correctness of the numerical results.
The security-reliability tradeoff (SRT) in free-space optical (FSO) communications is the most critical property to highlight, especially with respect to the development of wireless optical communications. In this paper, opportunistic scheduling selection techniques are used to improve the SRT of multiuser FSO systems under the combined influence of atmospheric turbulence with Fisher-SnedecorF\mathcal {F}Fdistribution, generalized pointing error, and path losses due to foggy weather. Due to the broadcast nature of wireless optical propagation, the optical transmission from the transmitting users to the legitimate receiver can be easily intercepted by eavesdroppers. Therefore, an optimal user scheduling (OUS) scheme is proposed in this work to protect the legitimate wireless transmission from eavesdroppers, where a user with the highest secrecy capacity is scheduled to transmit his confidential information to the receiver. Closed-form expressions for the outage probability, interception probability, and SRT are derived for the conventional round-robin scheduling (RRS) and the proposed OUS. In addition, an asymptotic analysis for the outage probability, interception probability, and SRT is performed to provide insight into the impact of user scheduling on the system performance. We also propose the use of “friendly jamming” techniques, where the user with the lowest secrecy capacity is selected by the authorized receiver to jam the existing interceptor. Finally, another SRT is formulated to determine the impact of a friendly jammer on the secrecy performance of the system. The results show that the proposed OUS outperforms the RRS in terms of intercept probability and SRT performance. The obtained exact and asymptotic results are validated by Monte-Carlo simulations.
This paper focuses on the impact of opportunistic scheduling schemes on the secrecy performance of a multiuser free-space optical network (MU-FSON). Considering a presence of a single passive eavesdropper, the best user with the highest signal-to-noise value is selected by the legitimate receiver among multiple users to communicate over an FSO link. The FSO links are assumed to follow the Málaga-M fading model with pointing errors. Initially, we derive a theoretical model of an MU-FSON considering the best user selection scheme. Then, the system outage probability and the system intercept probability are derived as the secrecy performance metrics of the considered MU-FSON. Our derived analytical expressions present an efficient tool to investigate the impact of some system and channel parameters on the secrecy performance, namely the number of users in the legal transmission process, atmospheric turbulence severity, and pointing errors of the FSO link. Numerical results are presented to validate the derived expressions and the accuracy of the obtained numerical results is confirmed by Monte-Carlo simulations.
This paper presents a secrecy performance analysis of a parallel free-space optical/millimeter-wave (mm-wave) communication system with a selection-combining receiver over a unified Fisher-SnedecorF\mathcal{F}F-distribution channel. TheF\mathcal{F}F-distribution model, with the proper parameters, may be used to describe both the mm-wave and optical channels. The security performance is specifically evaluated by deriving closed-form expressions for the average secrecy capacity, secrecy outage probability, and strictly positive secrecy capacity. We examine the three following distinct security scenarios: 1) An FSO-link eavesdropping attack, 2) mm-wave-link eavesdropping attacks, and 3) eavesdropping attacks on FSO and mm-wave links at the same time. Furthermore, to better understand the influence of various system and channel parameters, asymptotic analysis is performed at high signal-to-noise ratio values. Our developed analytical expressions provide an efficient tool for examining the influence of various system and channel parameters on the secrecy performance, including the atmospheric turbulence severity, pointing errors of the FSO link, fading severity, the shadowing parameters, as well as the number of diversity branches of the mm-wave links. Monte-Carlo simulations are used to verify the correctness of the numerical findings.
In this paper, we numerically study the secrecy performance of the free-space optical (FSO) system by considering different eavesdropping scenarios. More precisely, we considered three possible eavesdropping scenarios for Eve : 1) Eve is between Alice and Bob ; 2) Eve and Bob are in the same receiving plane; 3) Eve is behind Bob . We adopt the Málaga ( M )-distribution channel to model atmospheric turbulence due to the presence of link blockage while considering the non-zero boresight pointing error and path loss. To do so, we obtain a novel probability density function (PDF) and cumulative distribution function (CDF) under different eavesdropping scenarios, based on which we derived the secrecy outage probability (SOP) analytical expressions as well as their asymptotic expressions at a high SNR regime. We verified the results using Monte Carlo simulations, which showed that the parameters related to atmospheric turbulence and pointing errors, as well as the location of the eavesdropper, have different effects on different eavesdropping scenarios.
With the continued development of optical wireless communications, the security performance of free space optical (FSO) communications is the most crucial aspect that should receive significant attention. Despite the fact that FSO communications are considered more secure than radio frequency systems, their link performance degrades due to some environmental factors such as atmospheric turbulence, fog, and non-zero boresight pointing errors. The combined effect of these factors on the secrecy performance of FSO communication systems over the generalized Malaga- M fading channel is investigated in this paper. This work assumes a more realistic eavesdropping scenario in which both legitimate and unauthorized receivers are located on the same receiving plane. Secrecy outage probability and strictly positive secrecy capacity are expressed in exact closed-form expressions in this work. The results show that the FSO system has acceptable secrecy performance in moderate and light fog, with potential reach distances ranging from hundreds of meters to a few kilometers. Monte-Carlo simulations are used to verify the numerical results.
With the deployment of hybrid RF-FSO networks, there exists the potential to contribute significantly to the evolving landscape of 6G communication, as it effectively addresses challenges pertaining to connectivity, capacity, and security. In this paper, we study the secrecy performance of hybrid radio frequency (RF) - free space optical (FSO) systems in the presence of an eavesdropper. To improve the reliability of the source-destination transmission process, we consider a source that can transmit data via both RF and FSO links, simultaneously. Specifically, the RF links are exposed to generalized α – μ fading channels, while the FSO link is subject to Málaga distributions. Therefore, we deduce the novel analytical expression of secrecy outage probability and verify the results with the Monte Carlo simulations. The outcomes underscore the pronounced impact of fading parameters, receiver detection techniques, pointing errors, and atmospheric turbulence on security performance.