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Reconfigurable intelligent surface (RIS)-assisted unmanned areal vehicles(UAV) communications have been identified as a key enabler of a number ofnext-generation applications. However, to the best of our knowledge, there isno generalized framework for the quantification of the throughput performanceof RIS-assisted UAV systems. Motivated by this, in this paper, we present acomprehensive system model that accounts for the impact of multipath fading,which is modeled by means of mixture gamma, transceiver hardware imperfections,and stochastic beam disorientation and misalignment in order to examine thethroughput performance of a RIS-assisted UAV wireless system. In thisdirection, we present a novel closed-form expression for the system'sthroughput for two scenarios: i) in the presence and ii) in the absence ofdisorientation and misalignment. Interestingly, our results reveal theimportance of accurate modeling of the aforementioned phenomena as well as theexistence of an optimal transmission spectral efficiency.

Throughput analysis of RIS-assisted UAV wireless systems under disorientation and misalignment