Abstract
This paper considers secrecy enhancement mechanisms in visible light communication (VLC) systems with spatially distributed passive eavesdroppers (EDs) under the assumption that there are multiple LED transmitters and one legitimate receiver (UE). Based on certain amplitude constraints, we propose an optimal beamforming scheme to optimize secrecy performance. Contrary to the case where null-steering is made possible by using knowledge of the ED locations, we show that the optimal solution when only statistical information about ED locations is available directs the transmission along a particular eigenmode related to the intensity of the ED process and the intended channel. Then, a sub-optimal LED selection scheme is provided to reduce the secrecy outage probability (SOP). An approximate closed-form for the SOP is derived by using secrecy capacity bounds. All analysis is numerically verified by Monte Carlo simulations. The analysis shows that the optimal beamformer yields superior performance to LED selection. However, LED selection is still a highly efficient suboptimal scheme due to the complexity associated with the use of multiple transmitters in the full beamforming approach. These performance trends and exact relations between system parameters can be used to develop a secure VLC system in the presence of randomly distributed EDs.
Highlights
D user equipment (UE) to the rapid proliferation of mobile communication devices and the associated difficulties in adequately allocating spectra to support new services, visible light communication (VLC) has become an increasingly interesting topic of research in academia and industry
Inspired by the aforementioned contributions exploiting stochastic geometry in RF communications, our previous work [16] firstly developed an analogous approach to modeling ED locations in VLC systems
We propose a multiple-input single-output (MISO) beamforming solution that optimizes secrecy performance measures (e.g., the signal-to-noise ratio (SNR) and secrecy rate bounds) subject to a signal amplitude constraint for VLC systems when only information about the ED intensity measure is available at the transmitter;
Summary
D UE to the rapid proliferation of mobile communication devices and the associated difficulties in adequately allocating spectra to support new services, visible light communication (VLC) has become an increasingly interesting topic of research in academia and industry. The impact of random ED locations on secrecy performance for RF communications has been investigated in recent years [7]–[10]. Motivated by the advantage of PLS, a recent topic of interest in the research community has been the investigation of PLS applied in VLC systems using various transmission methods, e.g., beamforming, jamming, etc. Inspired by the aforementioned contributions exploiting stochastic geometry in RF communications, our previous work [16] firstly developed an analogous approach to modeling ED locations in VLC systems. We propose a MISO beamforming solution that optimizes secrecy performance measures (e.g., the signal-to-noise ratio (SNR) and secrecy rate bounds) subject to a signal amplitude constraint for VLC systems when only information about the ED intensity measure is available at the transmitter;.
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