This paper analyzes the performance of millimeter-wave (mmWave) non-orthogonal multiple access (NOMA) system with the aid of an intelligent reflecting surface (IRS). We derive the outage probability (OP) expressions at two users D 1 and D 2 of the IRS aided mmWave-NOMA system (the IRS-mmWave-NOMA system in the following). We validate the derived expressions via computer simulations. By considering the Nakagami-m fading channels and the path loss model proposed for 5G standard in the IRS-mmWave-NOMA system, our results are more suitable in practical scenarios. Specifically, numerical results observe that even the carrier frequency is extremely high (f c = 90 GHz) and the transmitter-receiver distances are further than 50 m, the OPs at D 1 and D 2 can achieve 10 −4 when the transmit power of base station (BS) is 30 dBm (dB in the following). Moreover, the OPs at D 1 and D 2 with IRS are greatly lower than OPs without IRS. This result demonstrates the huge benefits of utilizing IRS in mmWave-NOMA system. In addition, we can use an IRS with larger number of reflecting elements to maintain the OP performance at D 1 and D 2 when the distances are increased and f c is higher. On the other hand, we should choose a suitable value of power allocation coefficients to obtain the same performance at D 1 and D 2 .INDEX TERMS Non-orthogonal multiple access, millimeter-wave, intelligent reflecting surface, moment function, outage probability.
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