Abstract
In this paper, we propose a quality of service (QoS)-oriented adaptive virtual user association scheme for non-orthogonal multiple access (NOMA)- visible light communication (VLC) systems. Our schemes enables to surmount the throughput degradation caused by traditional synchronous NOMA multiplexing and the communication interruption due to low received QoS. Radio frequency configuration is proposed as a backup for VLC to ensure normal communication of users disconnecting from VLC, and the number of users participating in real-time association is adaptively updated. Orthogonal multiple access (OMA) is also incorporated with NOMA to further enhance the system performance. Numerical results demonstrate that compared with traditional NOMA and OMA methods, the proposed scheme could provide better network throughput and cumulative distribution function of user rate performance under perfect and imperfect successive interference cancellation in NOMA-VLC systems.
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