  Aerial-ground interference is the main obstacle to achieving high spectral
efficiency in cellular networks with both traditional terrestrial users and new
unmanned aerial vehicle (UAV) users. Due to their strong line-of-sight (LoS)
channels with the ground, UAVs could cause/suffer severe interference to/from a
large number of non-associated but co-channel base stations (BSs) in their
uplink/downlink communications. In this letter, we propose a new cooperative
interference cancellation (CIC) scheme for the UAV's uplink communication to
mitigate its strong interference to co-channel BSs, which requires only local
cooperation between each co-channel BS and its adjacent helping BSs.
Specifically, the helping BSs without serving any users in the UAV's
communication channel quantize and forward their received signals from the UAV
to their aided co-channel BS, which then processes the quantized signals
jointly with its own received signal to decode its served terrestrial user's
message via canceling the UAV's signal by linear/nonlinear interference
cancellation techniques (ICTs). We derive the achievable rates of the proposed
CIC scheme with different ICTs as a function of the UAV's transmit power and
rate, and thereby unveil the conditions under which the proposed CIC scheme
outperforms the existing CIC scheme based on the decode-and-forward (DF)
operation of the helping BSs.
