Abstract
In this paper, we study the secrecy performance of mixed radio-frequency (RF) - free space optical (FSO) systems by considering both RF and FSO eavesdropper attacks. More precisely, we shed light into the design of secure mixed RF-FSO relay networks by questioning two critical design problems: 1) What are the main parameters in the design of secure RF-FSO relay networks? 2) How can we improve the confidentiality of the optical information? To do so, we derive the secrecy outage probability and the probability of positive secrecy capacity performance for mixed RF-FSO relaying schemes under RF and FSO eavesdropper attacks, respectively. To justify the problem, we consider two general fading models, Nakagami- <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">m</i> at the RF side and exponentiated Weibull distribution at the FSO side. The results, which are validated with the Monte-Carlo simulations, show that both the location and the size of the photo-aperture is very important in the design of RF-FSO relay networks to enhance the secrecy performance of the overall system.
Highlights
Due to the explosive growth of wireless systems and devices, spectrum scarcity has become an important problem in wireless communications
Considering that Nakagami-m distribution can be suitable for various radio frequency (RF) environments and owing to the fact that Exponentiated Weibull (EW) fading can be used to model different atmospheric turbulence levels along with various aperture sizes [30], [31], we provide a general framework about RF and free-space optical (FSO) eavesdropping for mixed RF-FSO relay networks
Unlike previous works, which mainly focus on the RF eavesdropping for mixed RF-FSO relaying, we introduce a general physical layer security framework for dual-hop mixed RF-FSO relay networks by considering both RF and FSO eavesdropper attacks
Summary
Due to the explosive growth of wireless systems and devices, spectrum scarcity has become an important problem in wireless communications. Considering that Nakagami-m distribution can be suitable for various RF environments and owing to the fact that Exponentiated Weibull (EW) fading can be used to model different atmospheric turbulence levels along with various aperture sizes [30], [31], we provide a general framework about RF and FSO eavesdropping for mixed RF-FSO relay networks. Unlike previous works, which mainly focus on the RF eavesdropping for mixed RF-FSO relaying, we introduce a general physical layer security framework for dual-hop mixed RF-FSO relay networks by considering both RF and FSO eavesdropper attacks. In the last part of this work, we provide insightful remarks to shed light into the design of secure mixed RF-FSO relay networks These results show that the receiver aperture size, Nakagami-m fading parameter, and the weather conditions are of utmost importance in the design of secure mixed RF-FSO and FSO-RF communications.
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