Abstract
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 D1 and D2 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-<i>m</i> 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<sub>c</sub> = 90 GHz) and the transmitter-receiver distances are further than 50 m, the OPs at D<sub>1</sub> and D<sub>2</sub> can achieve 10<sup>-4</sup> when the transmit power of base station (BS) is 30 dBm (dB in the following). Moreover, the OPs at D<sub>1</sub> and D<sub>2</sub> 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<sub>1</sub> and D<sub>2</sub> when the distances are increased and f<sub>c</sub> is higher. On the other hand, we should choose a suitable value of power allocation coefficients to obtain the same performance at D<sub>1</sub> and D<sub>2</sub>.
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