Analysis of the performance of Unmanned Aerial Vehicle (UAV)-enabled communications systems often relies upon idealized antenna characteristic, where the side-lobe gain of UAVs' antenna is ignored. In practice, however, side-lobe cause inevitable interference to the ground users. We investigate the impact of UAVs' antenna side-lobe on the performance of UAV-enabled communication. Our analysis shows that even for a very small antenna's side-lobe gain, the ground receiver can experience substantial interference. We further show that a rather large exclusion zone is required to ensure a sufficient level of protection for the ground receiver. Nevertheless, in a multiple-antenna setting for the ground users, even when such a large exclusion zone was in place, UAVs' antenna side-lobe creates a high level of correlation among the interference signals received across receive antennas. Such a correlation limits the system ability to exploit channel diversity in a multiple-antenna setting for improving capacity. We then quantify the impact of UAVs' antenna side-lobes on the overall system performance by deriving the corresponding loss of the achieved capacity in various communications environments. We provide a new quantitative insight on the cost of adopting non-ideal UAV antenna on the overall capacity. Our analysis also shows that the capacity loss can be confined by careful selection of system parameters.

Additional Metadata
Persistent URL dx.doi.org/10.1109/ICC.2019.8761330
Conference 2019 IEEE International Conference on Communications, ICC 2019
Citation
Khoshkholgh, M.G. (M. G.), Navaie, K. (Keivan), Yanikomeroglu, H, Leung, V.C.M. (V. C.M.), & Shin, K.G. (Kang. G.). (2019). How Do Non-Ideal UAV Antennas Affect Air-to-Ground Communications?. In IEEE International Conference on Communications. doi:10.1109/ICC.2019.8761330