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Due to dense deployments of Internet of things (IoT) networks, interferencemanagement becomes a critical challenge. With the proliferation of aerial IoTdevices, such as unmanned aerial vehicles (UAVs), interference characteristicsin 3D environments will be different than those in the existing terrestrial IoTnetworks. In this paper, we consider 3D topology IoT networks with a mixture ofaerial and terrestrial links, with low-cost cross-dipole antennas at groundnodes and omni-directional antennas at aerial nodes. Considering amassive-access communication scenario, we first derive the statistics of thechannel gain at IoT receivers in closed form while taking into account theradiation patterns of both ground and aerial nodes. These are then used tocalculate the ergodic achievable rate as a function of the height of the aerialreceiver. We propose an interference mitigation scheme that utilizes 3D antennaradiation pattern with different dipole antenna settings. Our results show thatusing the proposed scheme, the ergodic achievable rate improves as the heightof aerial receivers increases. In addition, the ratio between the ground andaerial receivers that maximizes the peak rate also increases with the aerialIoT receiver height.

Interference Analysis and Mitigation for Massive Access Aerial IoT Considering 3D Antenna Patterns