Co-Channel Interference Suppression for Cellular-Connected UAV using NOMA

Unmanned aerial vehicles (UAVs) can be used as an aeronautical base stations (BSs) that facilitates wireless communication in a predetermined topographical locale. The UAV trademark Line-of-Sight (LoS) propagation brings challenges along with opportunities for UAV. The LoS channel interprets the cellular-connected UAV to generate/receive more stringent downlink/uplink interference to/from the base stations (BSs). The significant challenge is to enhance the max-min rate within the sight of co-channel interference (CCI) created by numerous UAVs working with a predefined target territory. The max-min rate optimization problem is formulated under total used bandwidth, UAV height, antenna beamwidth, and total power constraints considering CCI. To solve the figured problem, a path-following algorithm is preferred. The numerical results have shown that max-min rate using non-orthogonal multiple access (NOMA) and orthogonal multiple access (OMA) considering CCI achieve sufficiently close performance with the NOMA and OMA without considering CCI.