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Unmanned aerial vehicles (UAVs)-based applications, such as surveillancesystems and wireless relays, are attracting increasing attention from academiaand industrial fields. The high-performance aerial communication system is oneof the key enablers for them. However, due to the low attenuation of radiowaves in the air-to-ground channels, the interference between aerial andterrestrial communication systems would significantly deteriorate theircommunication performance and greatly limit the potential UAV applications. Toaddress the problem, in this paper, the spectrum sharing strategy between amultiple UAV communication system, in which both UAVs and ground station (GS)are equipped with directional antennas, and terrestrial systems is proposed.The GS position is selected and the flyable areas of the UAVs using certainspectrum resources are defined in advance using prior knowledge from spectrummonitoring on terrestrial communication systems to minimize interference andmaximize the flyable areas of the UAVs instead of the low-efficient dynamicchannel sensing and allocation for interference elimination. The simulationsare conducted through a case study of the spectrum sharing between a multi-UAVvideo transmission system and the terrestrial wireless local area network(WLAN) system in the 5.7GHz band. The simulation results show that thanks tothe proposed system the entire area can be enabled for UAV flight.

Spectrum Sharing between Directional-Antenna- Equipped UAV System and Terrestrial Systems