Abstract

We propose an adaptive non-orthogonal multiple access (NOMA) scheme and demonstrate its implementation for a multi-user system based on a novel white-light controller composed of orange CsPb(Br/I)₃ nanocrystals (NCs) and photopolymer film. By rotating the film within a small angle (<5°), the system provides a large coverage area of 30.11° semi-angle in 1-m distance while 3-dB modulation bandwidth reaches 395 MHz. Under the same experimental setting, the proposed algorithm achieves a sum rate of 1.95 Gbps for two users with bit-error-rates (BERs) of 8.24×10⁻⁴ and 2.24×10⁻³ respectively, which outperforms conventional fixed-size NOMA methods by more than 30%. The designed scheme is capable of alleviating channel unfairness and providing enhanced quality-of-service (QoS) for both center and edge users. It offers us a promising solution to develop large-coverage high-speed visible light communication (VLC) for multi-user scenarios together with indoor illumination.

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