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Performances of Downlink NOMA System with Power Domain Multiplexing

This paper analyzes the performance of non-orthogonal multiple access techniques used in the fifth generation of mobile networks. Examples of downlink NOMA (Non-orthogonal Multiple Access) systems on a channel with Rayleigh's frequency nonselective fading analyzed the probability of error per bit (BER - Bit Error Rate) in different scenarios with three and four users in the case of BPSK (Binary Phase Shift Keying) ) and QPSK (Quadrature Phase Shift Keying) modulations. The results obtained by Monte Carlo simulations show that BER depends on the state of the channel at the transmitter side (CSIT - Channel State Information at the Transmitter), the method of power distribution among users and the applied modulation techniques. BER is higher for users who have poorer CSIT, but decreases with increasing transmission power. A fixed power distribution was applied, which showed that the obtained results were not optimal. Also, in cases of application of BPSK modulation, it has been shown that signal reception is more reliable.