Abstract
In this paper, we maximize the throughput in Non Orthogonal Multiple Access (NOMA). Two approaches are presented to maximize either the average or instantaneous throughput. We optimize packet length to maximize the average throughput at any NOMA user. We also maximize the average total throughput. The total throughput is the sum of the throughput of all users. The second approach consists to adapt packet length to maximize the instantaneous throughput at any NOMA user. The optimization is performed in the presence of multiple NOMA users for Rayleigh and Nakagami fading channels.