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IEEE Vehicular Technology Conference

Secrecy Performance Enhancement of Artificial Noise Injection Scheme-based FSO Systems

Aman Sikri, Aashish Mathur, Gyandeep Verma

Published Sep 1, 2021• 7 citations
Publisher

Abstract

Artificial noise (AN) injection is one of the promising techniques for improving the secrecy performance of a communication system. In this paper, AN injection scheme is incorporated in free-space optical (FSO) communication system for improving the secrecy performance of free-space optical (FSO) communication systems. The FSO link is subjected to Gamma-Gamma (GG) distributed atmospheric turbulence (AT) with pointing errors (PEs). It is assumed that legitimate transmitter has only one FSO aperture while the legitimate receiver as well as an eavesdropper are equipped with multiple FSO apertures. The performance of the considered system is investigated by deriving novel series-based expressions for secrecy outage probability (SOP), secrecy throughput, and strictly positive secrecy capacity (SPSC) of the system. Finally, through numerical results, it is shown that the number of FSO apertures along with the proposed AN injection scheme and GG distributed AT with PEs have a significant impact on the performance of the considered system.

DOI
10.1109/vtc2021-fall52928.2021.9625198

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Artificial noise (AN) injection is one of the promising techniques for improving the secrecy performance of a communication system. In this paper, AN injection scheme is incorporated in free-space optical (FSO) communication system for improving the secrecy performance of free-space optical (FSO) communication systems. The FSO link is subjected to Gamma-Gamma (GG) distributed atmospheric turbulence (AT) with pointing errors (PEs). It is assumed that legitimate transmitter has only one FSO aperture while the legitimate receiver as well as an eavesdropper are equipped with multiple FSO apertures. The performance of the considered system is investigated by deriving novel series-based expressions for secrecy outage probability (SOP), secrecy throughput, and strictly positive secrecy capacity (SPSC) of the system. Finally, through numerical results, it is shown that the number of FSO apertures along with the proposed AN injection scheme and GG distributed AT with PEs have a significant impact on the performance of the considered system.
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.
Despite the high directivity of optical beams, free-space optical (FSO) communications may be compromised by the presence of an external observer, particularly when the beam footprint at the receiver side is greatly wider than the receiver size. In this paper, a new framework is developed for the analysis of the secrecy outage probability (SOP) and the probability of strictly positive secrecy capacity (SPSC) in FSO systems over gamma-gamma (GG) fading channels with nonzero boresight pointing errors. As a key feature, we include the eavesdropper's location in the pointing error model corresponding to the wiretap channel model. In this way, new approximate and asymptotic solutions for both the SOP and the probability of SPSC are obtained in closed-form, which are validated by Monte Carlo simulations. Using the developed expressions, we can study some effects such as the impact of the eavesdropper's location and the beam width on the secrecy outage performance.
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.
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.
In this paper, the secrecy performance of the physical layer security (PLS) of the hybrid free-space optical/radio frequency (FSO/RF) communication system is analyzed. The transmission protocol of the considered system is performed under the eavesdropper's attempt to overhear the RF link between the transmitter and legitimate receiver of the hybrid system. The FSO link is characterized by Málaga-M distribution while the RF links are modeled by Nakagami-m distribution. The two practical eavesdropping modes considered in this paper include: colluding and non-colluding. Exact closed-form expressions for the system's secrecy outage probability (SOP), the asymptotic of the SOP (SOP∞), the probability of strictly positive secrecy capacity (SPSC), the average secrecy capacity (ASC), and the asymptotic of the ASC (ASC∞), are specifically derived under the influence of both eavesdropper modes. Our derived analytical expressions present an efficient tool to investigate the impact of some channel parameters on the secrecy performance, namely the fading severity of the RF links, atmospheric turbulence severity, pointing error of the FSO link, number of eavesdroppers, and the power of the eavesdropper links. The results show that the increase of the eavesdroppers' number under both modes profoundly degrades the considered system secrecy performance. The accuracy of the numerical results obtained is validated by Monte-Carlo simulations.
Today, free-space optical (FSO) communication in the presence of an eavesdropper is considered as an important topic in the current literature. In this paper, security issues are investigated for FSO wiretap channels. Novel closed-form solutions, both approximate and asymptotic, for the average secrecy capacity (ASC) are derived over gamma-gamma (GG) atmospheric turbulence channels with pointing errors. As a significant aspect, misalignment errors at the eavesdropper's receiver follow the Rice distribution in order to take into consideration the spacing between the legitimate receiver and the eavesdropper's receiver, which is modeled as a nonzero boresight displacement. It is concluded that a greater normalized beam width is required to reduce the loss produced by such attacks in the high signal-to-noise-ratio (SNR) regime. Analytical results are further verified by Monte Carlo simulation results.