Hybrid active-passive reconfigurable intelligent surface-assisted UAV communications
Nguyen, Nhan T.; Nguyen, V.-Dinh; Wu, Qingqing; Tölli, Antti; Chatzinotas, Symeon; Juntti, Markku (2023-01-11)
N. T. Nguyen, V. . -D. Nguyen, Q. Wu, A. Tölli, S. Chatzinotas and M. Juntti, "Hybrid Active-Passive Reconfigurable Intelligent Surface-Assisted UAV Communications," GLOBECOM 2022 - 2022 IEEE Global Communications Conference, Rio de Janeiro, Brazil, 2022, pp. 3126-3131, doi: 10.1109/GLOBECOM48099.2022.10001719
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https://urn.fi/URN:NBN:fi-fe2023032332879
Tiivistelmä
Abstract
We consider a novel hybrid active-passive reconfigurable intelligent surface (RIS)-assisted unmanned aerial vehicle (UAV) air-ground communications system. Unlike the conventional passive RIS, the hybrid RIS is equipped with a few active elements to not only reflect but also amplify the incident signals for significant performance improvement. Towards a fairness design, our goal is to maximize the minimum rate among users through jointly optimizing the location and power allocation of the UAV and the RIS reflecting/amplifying coefficients. The formulated optimization problem is nonconvex and challenging, which is efficiently solved via block coordinate descend and successive convex approximation. Our numerical results show that a hybrid RIS requires only 4 active elements and a power budget of 0 dBm to achieve an improvement of 52.08% in the minimum rate, while that achieved by a conventional passive RIS with the same total number of elements is only 18.06%.
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