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The rise of intelligent reflecting surfaces (IRSs) is opening the door forunprecedented capabilities in visible light communication (VLC) systems. Bycontrolling light propagation in indoor environments, it is possible tomanipulate the channel conditions to achieve specific key performanceindicators. In this paper, we investigate the role that IRSs can play inboosting the secrecy capacity of non-orthogonal multiple access (NOMA) VLCsystems. More specifically, we propose an IRS-based physical layer security(PLS) mechanism that mitigates the information leakage risk inherent in NOMA.Our results demonstrate that the achieved secrecy capacity can be enhanced byup to 105% for a number of 80 IRS elements. To the best of our knowledge, thisis the first paper that examines the PLS of NOMA-based IRS-assisted VLCsystems.

Intelligent Reflecting Surfaces for Enhanced Physical Layer Security in NOMA VLC Systems