Optimization of UAV Heading for the Ground-to-Air Uplink
The authors consider a collection of single-antenna ground nodes communicating with a multi-antenna Unmanned Aerial Vehicle (UAV) over a multiple-access ground-to-air communications link. The UAV uses beamforming to mitigate inter-user interference and achieve Spatial Division Multiple Access (SDMA). First, they consider a simple scenario with two static ground nodes and analytically investigate the effect of the UAV's heading on the system sum rate. They then study a more general setting with multiple mobile ground-based terminals, and develop an algorithm for dynamically adjusting the UAV heading to maximize the approximate ergodic sum rate of the uplink channel, using a prediction filter to track the positions of the mobile ground nodes.