Reference : Hybrid Active-Passive Reconfigurable IntelligentSurface-Assisted UAV Communications
Scientific congresses, symposiums and conference proceedings : Poster
Engineering, computing & technology : Computer science
Computational Sciences
Hybrid Active-Passive Reconfigurable IntelligentSurface-Assisted UAV Communications
Nguyen, Nhan T. []
Nguyen, V.-Dinh []
Wu, Qingqing []
Tölli, Antti []
Chatzinotas, Symeon mailto [University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom >]
Juntti, Markku []
2022 IEEE Global Communications Conference (GLOBECOM)
4 to 8 December 2022
Rio de Janeiro
[en] 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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