Abstract
In this paper, we investigate a secure dual-hop radio frequency-free space optical (RF-FSO) mixed variable gain relaying framework in the presence of a single eavesdropper. The RF and FSO links are modeled with hyper Gamma (HG) and Gamma-Gamma (ΓΓ) fading channels, respectively. We assume that the eavesdropper utilizes another HG fading channel to wiretap the transmitted confidential data from the RF link. Our key concern is to defend this information against passive eavesdropping. We carry out the secrecy measurements by deriving closed-form mathematical expressions of average secrecy capacity (ASC), secure outage probability (SOP), and strictly positive secrecy capacity (SPSC), all in terms of Meijer's G function. Capitalizing on the derived expressions, we analyze the impacts of atmospheric turbulence and pointing errors on the secrecy capacity and outage performance of the proposed scenario. For gaining more insights, we also analyze the asymptotic outage behaviour for high signal-to-noise ratio. Two detection techniques i.e. heterodyne (HD) and the intensity modulation with direct detection (IM/DD) are taken into consideration and our results demonstrate that HD technique notably outperforms the IM/DD scheme. The supremacy and novelty of the model is demonstrated via utilizing generic properties of the HG fading channel. Finally, we provide a justification of the derived expressions via Monte-Carlo simulations.
Highlights
On the other hand, fading model can accurately make intelligible outcomes amid intense atmospheric turbulence and pointing error impairment circumstances. Inspired by these conveniences of mixed radio frequency-free space optical (RF-Free space optical (FSO)) networks with generalized radio frequency (RF) channels, we present a secure scenario over hyper Gamma (HG)- mixed RF-FSO fading channel
Several analytical results regarding the deduced expressions of secrecy outage probability (SOP), average secrecy capacity (ASC), and strictly positive secrecy capacity (SPSC) are illustrated with the help of Figures
The impacts of Pkr on ASC and SOP are analyzed in Figs. 2 and 3, respectively
Summary
The expressions of EC and OP were obtained in [25]–[27] considering a Nakagami-m-Málaga turbulent fading channel where in [27], the authors made an extension with CCI to imply that the performance of the RF-FSO system depends on the number and power of CCI. Nakagami-m- fading RF-FSO model by determining the expressions of lower bound of SOP and ASC in closed-form while considering pointing error, and HD and IM/DD techniques at the FSO receiver. On the other hand, fading model can accurately make intelligible outcomes amid intense atmospheric turbulence and pointing error impairment circumstances Inspired by these conveniences of mixed RF-FSO networks with generalized RF channels, we present a secure scenario over hyper Gamma (HG)- mixed RF-FSO fading channel. Besides exact expression of SOP, we provide asymptotic expression of SOP for obtaining better insights into the outage behaviour
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