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INDEX TERMS Backhaul, beamforming, beamsteering, massive MIMO (MaMIMO), multiuser MIMO (MuMIMO), radio access network, unmanned aerial base station. ... Future wireless communication networks can benefit from Unmanned Aerial Base Stations (UABSs) to provide enhanced capacity to ground users (GU) in large and remote locations. ... INTRODUCTION Over the last few years, the use of a Base Station (BS) mounted on a drone or UAV (Unmanned Aerial Vehicle), i.e., an Unmanned Aerial Base Station (UABS), has gained popularity as a promising ...doi:10.1109/access.2022.3182120 fatcat:4hxkmb65rbdrzo4ewrkulzhk74