A novel approach to fair power allocation for NOMA in visible light communication

Achieving fairness in power allocation is crucial for maximizing the performance of Non-Orthogonal Multiple Access (NOMA) systems in Visible Light Communication (VLC). However, existing power allocation methods for NOMA-VLC often struggle to maintain fairness. This paper addresses this challenge by introducing the Empirical Fair Optical Power Allocation (EFOPA) method. EFOPA leverages a simplified mathematical model to achieve maximum fairness among users, ensuring equitable data rates even when channel conditions and illumination levels vary. Furthermore, EFOPA significantly reduces computational complexity compared to optimisation based approaches, making it suitable for dynamic environments where users move frequently. Simulation results demonstrate that EFOPA outperforms existing methods GRPA and NGDPA in terms of fairness and maintains comparable sum-rate performance, offering a robust and efficient solution for power allocation in NOMA-VLC systems.