Abstract
The downlink non-orthogonal multiple access (NOMA) with successive interference cancellation (SIC) improves both the system throughput and cell edge user equipments (UEs) throughput. However, there are constraints on position and transmit power of UEs in NOMA. The base stations (BSs) transmit signals to the UE nearby and the UE far away with lower power and higher power, respectively. Without the constraint, we propose a probability model to derive the exactly throughput of UEs in NOMA. Moreover, the concept of the NOMA can combine with that of coordinated multipoint (CoMP). The associated BSs transmit signals to the UEs near themselves while also transmit signal to a cell-edge UE between two cells; with that it can improve the system throughput. We also propose a probability model for NOMA+CoMP. Based on the probability model, we propose an efficient resource allocation algorithm whose objective function is to maximize the number of satisfied UEs. The simulation results show that the proposed algorithm outperforms the compared algorithm in number of the satisfied UEs.