Abstract
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-Snedecor <inline-formula><tex-math notation="LaTeX">$\mathcal{F}$</tex-math></inline-formula>-distribution channel. The <inline-formula><tex-math notation="LaTeX">$\mathcal{F}$</tex-math></inline-formula>-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.
Highlights
BackgroundTHE increased requirement for extremely high data rates in next-generation mobile systems (5G and beyond) demands backhaul networks that are far more powerful and dependable than previous systems [1]
We investigate the effects of Free space optical (FSO) turbulence parameters and pointing errors, fading, and shadowing parameters, number of diversity branches for mm-wave links, and SNR values received by eavesdropping links on secrecy performance
The secrecy performance of a parallel FSO/mm-wave system is analyzed using a unified Fdistribution. These analyses are provided for three different scenarios based on the number of eavesdroppers are activated during data transmission
Summary
THE increased requirement for extremely high data rates in next-generation mobile systems (5G and beyond) demands backhaul networks that are far more powerful and dependable than previous systems [1]. Free space optical (FSO) communication, on the other hand, allows for high-rate and low-latency transmission while being very susceptible to atmospheric conditions and adverse weather impacts [2]. In order to combine the advantages of millimeter-wave (mm-wave) RF communication (resilience to atmospheric and weather effects) and FSO communication (secure transmission at a high data rate), a parallel setup of FSO and millimeter-wave (mm-wave) RF communication systems have been developed as a more reliable candidate solution for backhaul networks as an integral part of 5G systems and in a variety of other applications [6]. Past research has focused on eavesdropping attacks on legitimate RF links in parallel FSO/mm-wave systems but has never looked at simultaneous eavesdropping attacks on both channels under the influence of unified distributions for optical and radio links
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