Treffer: Performance and Outage Probability of RIS‐Aided UAV Communications in NOMA Networks.

In this paper, a nonorthogonal multiple access (NOMA) network is considered to assist ground users' communications with two reconfigurable intelligent surfaces (RISs) and one unmanned aerial vehicle (UAV) technologies. In this scheme, UAV acts as a relay while the first RIS aids ground‐to‐air (G2A) communication and the second RIS helps the air‐to‐ground (A2G) communication. Under the outage probability (OP) constraint, the problem is formulated to maximize the data rate of the ground users by optimizing the transmission powers of base station (BS) and UAV, power allocation coefficients to the users and phase shift of the reflecting elements (REs) of RISs. An iterative algorithm is proposed using artificial bee colony (ABC) method for solving the problem and improving the network performance. Proposed algorithm is validated by Monte Carlo simulations, and the impact of system parameters is investigated on the network performance. Numerical results clarify that by two RISs utilization, the performances of the network are approximately improved 25% and 40% in terms of the network data rate and total OP, respectively, in comparison with the bench mark algorithms. [ABSTRACT FROM AUTHOR]

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