Due to dense deployments of Internet of things (IoT) networks, interference management becomes a critical challenge. With the proliferation of aerial IoT devices, such as unmanned aerial vehicles (UAVs), interference characteristics in 3D environments will be different than those in the existing terrestrial IoT networks. In this paper, we consider 3D topology IoT networks with a mixture of aerial and terrestrial links, with low-cost cross-dipole antennas at ground nodes and both omni-directional and cross-dipole antennas at aerial nodes. Considering a massive-access communication scenario, we first derive the statistics of the channel gain at IoT receivers in closed form while taking into account the radiation patterns of both ground and aerial nodes. These are then used to calculate the ergodic achievable rate as a function of the height of the aerial receiver and the cumulative interference. We propose a low-complexity interference mitigation scheme that utilizes 3D antenna radiation pattern with different dipole antenna settings. Our results show that using the proposed scheme, the ergodic achievable rate improves as the height of the aerial receivers increases. In addition, we also show that the ratio between the ground and aerial receivers that maximizes the peak rate increases with the height of the aerial IoT receiver.

中文翻译：

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考虑3D天线方向图的空中物联网的干扰分析和缓解

由于物联网（IoT）网络的密集部署，干扰管理成为一项严峻的挑战。随着无人驾驶飞机（UAV）等空中IoT设备的普及，3D环境中的干扰特性将不同于现有的地面IoT网络。在本文中，我们考虑混合了空中和地面链路的3D拓扑IoT网络，地面节点使用低成本的交叉偶极天线，空中节点使用全向和交叉偶极天线。考虑到大规模访问通信场景，我们首先以封闭形式导出物联网接收器的信道增益统计信息，同时考虑地面和空中节点的辐射方向图。然后将这些用于计算遍历可达到的速率，该速率是天线接收器的高度和累积干扰的函数。我们提出了一种低复杂度的干扰缓解方案，该方案利用具有不同偶极子天线设置的3D天线辐射方向图。我们的结果表明，使用所提出的方案，遍历可达到的速率随着天线高度的增加而提高。此外，我们还表明，使峰值速率最大化的地面接收器与空中接收器之间的比率随着空中物联网接收器的高度而增加。随着空中接收器高度的增加，遍历可达到的速率也会提高。此外，我们还表明，使峰值速率最大化的地面接收器与空中接收器之间的比率随着空中物联网接收器的高度而增加。随着空中接收器高度的增加，遍历可达到的速率也会提高。此外，我们还表明，最大化峰值速率的地面接收器与空中接收器之间的比率随着空中物联网接收器的高度而增加。