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arXiv · 2606.03505

Secrecy Sum Rate Maximization for OIRS-Aided Visible Light Communications with Confidential Messages

Trinh K. Nguyen·Hung K. Hoang·Thanh V. Pham·Chuyen T. Nguyen
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Abstract

This paper investigates the secrecy sum-rate (SSR) performance of optical intelligent reflecting surface (OIRS)-assisted multi-user visible light communication (VLC) systems under line-of-sight (LoS) blockages. To mitigate physical obstructions and internal eavesdropping, a joint optimization problem is formulated to maximize the SSR through the co-design of the transmission precoder and OIRS units assignment. Due to the binary constraints and coupled variables, the problem is highly non-convex. To solve it efficiently, an alternating optimization (AO) framework integrating the concave-convex procedure (CCCP) and first-order Taylor approximations is developed. Simulation results demonstrate the convergence of the proposed algorithm and show that increasing the number of OIRS reflecting units yields significant SSR gains.

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Trinh K. Nguyen, Hung K. Hoang, Thanh V. Pham, Chuyen T. Nguyen. 2026-06-02. Secrecy Sum Rate Maximization for OIRS-Aided Visible Light Communications with Confidential Messages. https://arxiv.org/abs/2606.03505

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