4 research outputs found
A Survey of Air-to-Ground Propagation Channel Modeling for Unmanned Aerial Vehicles
In recent years, there has been a dramatic increase in the use of unmanned
aerial vehicles (UAVs), particularly for small UAVs, due to their affordable
prices, ease of availability, and ease of operability. Existing and future
applications of UAVs include remote surveillance and monitoring, relief
operations, package delivery, and communication backhaul infrastructure.
Additionally, UAVs are envisioned as an important component of 5G wireless
technology and beyond. The unique application scenarios for UAVs necessitate
accurate air-to-ground (AG) propagation channel models for designing and
evaluating UAV communication links for control/non-payload as well as payload
data transmissions. These AG propagation models have not been investigated in
detail when compared to terrestrial propagation models. In this paper, a
comprehensive survey is provided on available AG channel measurement campaigns,
large and small scale fading channel models, their limitations, and future
research directions for UAV communication scenarios
Air-to-Ground Channel Characterization for Low-Height UAVs in Realistic Network Deployments
Due to the decrease in cost, size and weight, \acp{UAV} are becoming more and
more popular for general-purpose civil and commercial applications. Provision
of communication services to \acp{UAV} both for user data and control messaging
by using off-the-shelf terrestrial cellular deployments introduces several
technical challenges. In this paper, an approach to the air-to-ground channel
characterization for low-height \acp{UAV} based on an extensive measurement
campaign is proposed, giving special attention to the comparison of the results
when a typical directional antenna for network deployments is used and when a
quasi-omnidirectional one is considered. Channel characteristics like path
loss, shadow fading, root mean square delay and Doppler frequency spreads and
the K-factor are statistically characterized for different suburban scenarios.Comment: 15 pages, accepted in IEEE Transactions on Antennas and Propagatio