  In this paper, millimeter wave (mmWave) wireless channel characteristics
(Doppler spread and path loss modeling) for Unmanned Aerial Vehicles (UAVs)
assisted communication is analyzed and studied by emulating the real UAV motion
using a robotic arm. The motion considers the actual turbulence caused by the
wind gusts to the UAV in the atmosphere, which is statistically modeled by the
widely used Dryden wind model. The frequency under consideration is 28 GHz in
an anechoic chamber setting. A total of 11 distance points from 3.5 feet to
23.5 feet in increments of 2 feet were considered in this experiment. At each
distance point, 3 samples of data were collected for better inference purposes.
In this emulated environment, it was found out that the average Doppler spread
at these different distances was around -20 Hz and +20 Hz at the noise floor of
-60 dB. On the other hand, the path loss exponent was found to be 1.843. This
study presents and lays out a novel framework of emulating UAV motion for
mmWave communication systems, which will pave the way out for future design and
implementation of next generation UAV-assisted wireless communication systems.
