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Communication at mmWave bands carries critical importance for 5G wirelessnetworks. In this paper, we study the characterization of mmWave air-to-ground(AG) channels for unmanned aerial vehicle (UAV) communications. In particular,we use ray tracing simulations using Remcom Wireless InSite software to studythe behavior of AG mmWave bands at two different frequencies: 28~GHz and60~GHz. Received signal strength (RSS) and root mean square delay spread(RMS-DS) of multipath components (MPCs) are analyzed for different UAV heightsconsidering four different environments: urban, suburban, rural, and over sea.It is observed that the RSS mostly follows the two ray propagation model alongthe UAV flight path for higher altitudes. This two ray propagation model isaffected by the presence of high rise scatterers in urban scenario. Moreover,we present details of a universal serial radio peripheral (USRP) based channelsounder that can be used for AG channel measurements for mmWave (60 GHz) UAVcommunications.

UAV Air-to-Ground Channel Characterization for mmWave Systems