Abstract
This work deals with the secrecy performance analysis of a dual-hop RF-FSO DF relaying network composed of a source, a relay, a destination, and an eavesdropper. We assume the eavesdropper is located close to the destination and overhears the relay’s transmitted optical signal. The RF and FSO links undergo (α-κ-μ)-shadowed fading and unified Málaga turbulence with pointing error. The secrecy performance of the mixed system is studied by deriving closed-form analytical expressions of secure outage probability (SOP), strictly positive secrecy capacity (SPSC), and intercept probability (IP). Besides, we also derive the asymptotic SOP, SPSC, and IP upon utilizing the unfolding of Meijer’s G function where the electrical SNR of the FSO link tends to infinity. Finally, the Monte-Carlo simulation is performed to corroborate the analytical expressions. Our results illustrate that fading, shadowing, detection techniques (i.e. heterodyne detection (HD) and intensity modulation and direct detection (IM/DD)), atmospheric turbulence, and pointing error significantly affect the secrecy performance. In addition, better performance is obtained exploiting the HD technique at the destination relative to IM/DD technique.
Highlights
The secrecy performance of the mixed system is studied by deriving closed-form analytical expressions of secure outage probability (SOP), strictly positive secrecy capacity (SPSC), and intercept probability (IP)
The AKM-shadowed and M random variables are generated via MATLAB, where we make an average of 100,000 channel realizations to obtain every value of secrecy parameters
This work focuses on the protection of secret information against Free space optical (FSO) eavesdropping over a radio frequency (RF)-FSO mixed system where the RF and FSO links are assumed to follow AKMshadowed and Málaga turbulence fading models
Summary
Free space optical (FSO) technology has drawn significant attention of the research communities compared to traditional radio frequency (RF) technologies in wireless communication applications due to advantages of high-frequency bandwidth, high speed, high security, large transmission capacity, disaster recovery, fast deployment, unlicensed spectrum, back-haul for wireless cellular networks, solution for the last-mile access problem, fiber backup, and no interference, among many others [1]. Pointing error and atmospheric turbulence highly impact the system performance of FSO schemes [2]–[5] that can be mitigated by utilizing a dual-hop mixed RF-FSO relaying system. The effect of imperfect channel state information was considered in [42] and the performance analysis was carried out in terms of secrecy outage probability (SOP) adopting the fixed gain relaying technique. We consider a mixed RFFSO dual-hop DF relaying system where the RF and FSO links, respectively, experience AKM-shadowed fading and Málaga turbulence fading model included with pointing error. Capitalizing on the final expressions of the secrecy performance parameters, we observe impacts of fading, shadowing, atmospheric turbulence, pointing error, etc., on the secrecy of the proposed scenario.
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