Power Allocation Algorithm Considering Qos and Max-Min Fairness in Single-Beam UVLC System

To meet the service requirements of different users in a single beam, we divide the system's users in a single beam into two categories named edge users and fair users. We also propose a power allocation algorithm that guarantees the quality of service (QoS) for edge users and fairness for fair users. For these two types of users, an optimization model of power distribution under the constraints of specific LED emission power is established, which ensures the user QoS for edge users and the max-min fairness for fair users. Using the Karush-Kuhn-Tucker (KKT) condition and the bisection method, we obtain the optimal power allocation expression for the two types of users in the optimization model. Through simulation, we verify that the proposed user classification and power allocation method can ensure the fairness of fair users on the premise of ensuring the QoS of edge users. At the same time, we know that the number of users will affect the improvement of the minimum rate, and the throughput of the non-orthogonal multiple access (NOMA) system is greatly improved compared with the traditional orthogonal multiple access (OMA) systems.