Abstract
This paper presents a study of the physical layer security performance of a mixed radio frequency-free space optical (RF-FSO) system with a wireless-powered friendly jammer. The RF links undergo the Nakagami-m fading, and the FSO link experiences the Exponentiated Weibull (EW) distribution. A two-hop decode-and-forward (DF) relay is present in the system. A single-antenna eavesdropper located on the RF link attempts to eavesdrop on the channel transmission information. There is a nearby multi-antenna jammer that can be charged wirelessly, and a save-then-transmit (ST) protocol is introduced in the jammer. The closed expressions for the secrecy outage probability (SOP) and the average secrecy capacity (ASC) of the mixed RF-FSO system are derived, and the correctness of the expressions is verified using the Monte-Carlo method. The influence of various key factors on the secrecy performance of the system is analyzed by simulations. The results show that increasing the average interference noise ratio, the number of interferer antennas, the time block allocation factor, and the size of the receiving aperture has a significant effect on the secrecy performance. This study provides a new system structure and a good theoretical basis for evaluating the physical layer security performance of mixed RF-FSO systems.
Highlights
The rapid development of wireless communication is leading to an accelerated growth in the demand for wireless communication equipment
Reasonable setting of ρ according to the actual situation can effectively improve the secrecy performance
Large receiving aperture leads to a risk of eavesdropping on the free-space optical (FSO) link
Summary
The rapid development of wireless communication is leading to an accelerated growth in the demand for wireless communication equipment. Considering the broadcast nature of the wireless RF channel in mixed systems, the secrecy performance of the system is at risk in the presence of malicious eavesdroppers. The RF-FSO systems have been studied considering the impact of single-input multiple-output (SIMO), multipleinput multiple-output (MIMO) and transmit antenna selection (TAS) schemes, and simultaneous wireless information and power transfer (SWIPT) techniques on the physical layer security of mixed systems under different channels, respectively. In [9], the author proposed a mixed SIMO SWIPT RF and FSO fixed-gain relaying system, analyzed the security issues in the case of an energy harvester acting as an eavesdropper, and derived the SOP and ASC. This paper presents a study of the physical layer secrecy performance of a mixed RF-FSO system in the presence of an eavesdropper and under the influence of a wirelesspowered friendly jammer with ST protocol. The accuracy of the expression is verified using the Monte-Carlo methods
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