Investigation of power allocation schemes in NOMA.

In a non-orthogonal multiple access (NOMA) system, most crucial function at the transmitter is power allocation followed by superposition coding and at the receiver end successive interference cancellation (SIC). The overall system throughput and performance of the system depends on user clustering, power allocation scheme and SIC at receiver, which is expected to have minimal error. In this paper, we compare the performance of different power allocation algorithms through symbol error rate versus signal to noise ratio plot randomising Rayleigh channel conditions. Simulations are done for the power-domain NOMA system. We propose Eigenvalue-based power allocation in NOMA, which performs better than the traditional counterparts. The simulation is carried out for two-user system using MATLAB. [ABSTRACT FROM AUTHOR]