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IEEE International Conference on Telecommunications and Photonics (ICTP)

On Physical Layer Security Analysis of Hybrid RF/FSO Wireless Networks over k – μ/GG Channels with Pointing Error Impairments

Saikrishna Kotha, Md. Najib Ibrahim, S.H. Abhi, A. S. M. Badrudduza

Published Dec 21, 2023• 4 citations
Publisher

Abstract

The integration of mixed Radio Frequency (RF) and Free-Space Optical (FSO) wireless models in 6G wireless systems is pivotal for harnessing the complementary strengths of both technologies, enabling unprecedented levels of reliability, capacity, and security in next-generation networks. To address this combined use, this paper delves into the secrecy performance of a hybrid RF-FSO mixed model. Moreover, the transmitter and receiver establish communication through two distinct paths: the first link utilizes RF technology, characterized by a$\kappa-\mu$shadowed fading distribution, while the second link employs FSO technology, encountering Gamma-Gamma (GG) turbulence with pointing error impairment. At the receiver, a selection combining technique is employed to choose between the incoming signals. In order to analytically assess the improvement, we deduce the analytical expressions of secrecy outage probability (SOP) in closed form. Our findings substantiate that the hybrid RF- FSO model surpasses a single FSO/RF link in terms of secrecy outage probability. Finally, Monte Carlo simulations are conducted to validate the accuracy of the derived expressions.

DOI
10.1109/ictp60248.2023.10490480

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The integration of mixed Radio Frequency (RF) and Free-Space Optical (FSO) wireless models in 6G wireless systems is pivotal for harnessing the complementary strengths of both technologies, enabling unprecedented levels of reliability, capacity, and security in next-generation networks. To address this combined use, this paper delves into the secrecy performance of a hybrid RF-FSO mixed model. Moreover, the transmitter and receiver establish communication through two distinct paths: the first link utilizes RF technology, characterized by aκ−μ\kappa-\muκ−μshadowed fading distribution, while the second link employs FSO technology, encountering Gamma-Gamma (GG) turbulence with pointing error impairment. At the receiver, a selection combining technique is employed to choose between the incoming signals. In order to analytically assess the improvement, we deduce the analytical expressions of secrecy outage probability (SOP) in closed form. Our findings substantiate that the hybrid RF- FSO model surpasses a single FSO/RF link in terms of secrecy outage probability. Finally, Monte Carlo simulations are conducted to validate the accuracy of the derived expressions.
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.
On Effective Secrecy Throughput of Underlay Spectrum Sharing ααα-μμμ/ Málaga Hybrid Model under Interference-and-Transmit Power Constraints
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On Effective Secrecy Throughput of Underlay Spectrum Sharing α−μ\alpha -\muα−μ/ Málaga Hybrid Model Under Interference-and-Transmit Power Constraints
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The emergence of an array of new wireless networks has led researchers to evaluate the prospect of utilizing the physical properties of the wireless medium in order to design secure systems. In this paper, the physical layer secrecy performance of a mixed radio frequency-free space optical (RF-FSO) system with variable gain relaying scheme is investigated in the presence of an eavesdropper. We assume that the eavesdropper can wiretap the transmitted confidential data from the RF link only. It is further assumed that the main and eavesdropper RF links are modeled as generalized Gamma (GG) fading channel, and the free space optical (FSO) link experiences Málaga turbulence with pointing error impairment. Our primary concern is to protect this confidential information from being wiretapped. Besides pointing error, the atmospheric turbulence and two types of detection techniques (i.e. heterodyne detection and intensity modulation with direct detection) are also taken into consideration. Utilizing amplify-and-forward (AF) scheme, the novel mathematical closed-form expressions for average secrecy capacity, lower bound of secrecy outage probability, and strictly positive secrecy capacity are derived. As both the links (RF and FSO) undergo generalized fading channels, the derived expressions are also general. We present a unification of some existing works utilizing the proposed model to better clarify the novelty of this work. Finally, all the derived expressions are justified via Monte-Carlo simulations.
This paper investigates the secrecy performance for a decode-and-forward (DF) based mixed radio-frequency (RF) and free-space-optics (FSO) cooperative wireless network. The Rayleigh distribution is used to characterize the RF channel, similarly the turbulence effect in the FSO link is characterized by double-generalized-Gamma (DGG) distribution. The effect of pointing error is included during analysis. The closed form expressions of outage-probability for secrecy (SOP) and probability of non-zero secrecy capacity or strictly-positive-secrecy-capacity (SPSC) are analysed in terms of Meijer'G function. Finally all of the aforementioned results are verified via Monte-Carlo simulation.
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