Abstract
In this paper, we study physical layer security (PLS) aspects of a hybrid radio frequency (RF)/visible light communication (VLC) system with multiple decode-and-forward relaying nodes equipped with friendly jamming capabilities. We first propose a novel joint relay–jammer selection algorithm to enhance the secrecy performance of the network. Next, we obtain beamforming vectors and the minimal power values, which satisfy the required secrecy threshold. Our simulation results show that the proposed hybrid RF/VLC scheme obtains higher secrecy capacity compared to the standalone VLC and RF technologies. Finally, we proved the proposed technique to be an eavesdropping-resilient PLS solution.
Highlights
Due to the unprecedented expansion of wireless traffic volumes in the radio frequency (RF) spectrum (for instance, Internet of Things (IoT) is one of the reasons of such spectrum contingency [1]), industrial and academic players have recently proposed to exploit visible light communication (VLC) technology
We consider the secrecy of the proposed hybrid technique presented in Fig. 4 where it can be observed that the required secrecy capacity (SC) of 6 bits/s/Hz is achievable in most of the area of the room
Regarding the location of E, we can see that the system experiences lower secrecy compared to the other areas and this can be explained by the fact that the VLC subsystem itself has poor performance, as expected
Summary
Due to the unprecedented expansion of wireless traffic volumes in the radio frequency (RF) spectrum (for instance, Internet of Things (IoT) is one of the reasons of such spectrum contingency [1]), industrial and academic players have recently proposed to exploit visible light communication (VLC) technology. VLC has its own limitation such as communication unreliability when its line-of-sight (LOS) nature restricts the signal propagation [8]. The authors in [23] evaluated the spectral efficiency and the ergodic capacity of the amplify-and-forward (AF) relaying network. The authors in [24] considered the wireless powered CR relaying network and corresponding bit-error rate (BER) metric was evaluated. In [26], [27], it was shown that the ergodic capacity and outage performance metrics can be improved with relay placement in wireless powered AF-based relaying networks. Energy harvesting (EH) was proposed in [28] to enhance the network coverage in hybrid RF/VLC DF relaying systems. Energy harvesting (EH) was proposed in [28] to enhance the network coverage in hybrid RF/VLC DF relaying systems. [29] studied a hybrid RF/VLC network with the EH-enabled relay with imposed latency constraints
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