Joint User Clustering and Power Allocation for Indoor MIMO-NOMA-VLC Systems

This paper investigates the joint problem of user association and power allocation for the downlink of non-orthogonal multiple access (NOMA)-visible light communication (VLC) systems. We propose a novel user association (UA) method for MIMO-NOMA-VLC, which takes into account both user channel gain and channel correlation comprehensively to enhance multiplexing efficiency. Additionally, we introduce a novel optimized power allocation scheme based on the UA method to optimize the system throughput while meeting the lighting requirements, quality of service (QoS) requirements, and transmission power constraints for each user. Finally, we demonstrate the superiority of our proposed scheme compared to traditional user grouping schemes and power allocation schemes in terms of network capacity.