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In this paper, we have analyzed the performance of a new design of the intelligent reflecting surface-non orthogonal multiple access (IRS-NOMA) system by considering all the elements of IRS to provide coherent phase shift to both users in a NOMA pair. In addition, we have designed a phase shift matrix of IRS that combines the components from IRS elements with coherent phases across both the users. The closed-form expression for the user's outage probability (OP) is derived using the Gauss-Chebyshev quadrature (GCQ) and moment-matching method to assess the system performance. Also, system throughput is evaluated in a delay-limited transmission mode. Numerical results reveal that our proposed system model of IRS-NOMA achieves better OP and higher system throughput than the other existing scenarios of IRS-NOMA networks. Finally, the Monte-Carlo simulations are also presented to verify the closed-form expressions.
Kumar et al. (Mon,) studied this question.