Optimum power allocation for non-orthogonal multiple access (NOMA)

An optimum power allocation scheme for non-orthogonal multiple access (NOMA) with successive interference cancellation (SIC) technique for downlink channels of next generation cellular networks is proposed in this paper. In NOMA downlinks, the signals for each user are superimposed at the transmitter side and SIC is implemented at the receiver side to separate them. Numerical results show that the overall system throughput performance can be improved significantly by the proposed power allocation algorithm with NOMA in comparison with orthogonal multiple access (OMA), which is implemented in previous wireless telephone technology generations.