POWER ALLOCATION ALGORITHM FOR NOMA SYSTEM UNDER FAIRNESS CONSTRAINTS

Aiming at the problem that the value range of traditional fairness metrics is affected by the number of users, this paper proposes a fairness index based on rate variance, which has a fixed value range and high sensitivity. Based on the proposed fairness index, the power allocation problem constrained by intra-group and inter-group fairness was studied in non-orthogonal multiple access systems. This paper decoupled the problem into an inter-group power allocation problem and an intra-group power allocation problem. A joint intra-group and inter-group power allocation algorithm for maximizing the total throughput under fairness constraints was proposed. The simulation results demonstrate that this algorithm can take into account the intra-group, inter-group and system fairness, and maximize the system throughput under the premise of ensuring fairness.