基于功率控制的无人机干扰抑制方案研究
首发时间:2019-01-28
摘要:对于由地面蜂窝移动通信网络所支持的无人机与地面用户共存的通信系统,由于无人机较高的飞行高度导致无人机与基站之间为直射径链路的概率上升,无人机会对地面用户业务带来较大的干扰,如何设计有效的干扰抑制方案来削弱无人机对相邻小区用户的干扰成为无人机在网络部署中的难点。本文研究无人机与地面用户共存场景下基于功率控制的干扰抑制方案,提出了基于用户高度分组与基于参考信号接收功率的改进无人机功率控制方案。通过搭建无人机系统级仿真平台对提出的方案进行验证,最终得出以下结论:(1)随着无人机数目的增加相邻小区受到的干扰强度迅速增大。(2)基于对用户高度分组的功率控制方案可有效降低对地面用户的干扰,但是会带来无人机一定程度的性能下降。(3)基于参考信号接收功率的功率控制方案由于考虑了不同无人机对相邻小区造成干扰强度的不同,可以在有效降低对地面用户干扰的同时,也带来无人机整体性能的提升。
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Research on interference mitigation scheme for unmanned aerial vehicles based on power control
Abstract:For a communication system in which drones supported by terrestrial cellular communication network coexist with terrestrial users, the probability of a Line of sight link between the drone and the base station increases due to the high flying height of the drone, and the drone brings great interference to ground user. How to design an effective interference mitigation scheme to weaken the interference of the drone to the neighboring cell users becomes a difficult point for the network deployment of the drone. This paper studies the power control-based interference mitigation scheme for coexistence scenarios between UAVs and terrestrial users. Improved UAV power control schemes based on user altitude grouping and reference signal receiving power are proposed. By constructing the UAV system-level simulation platform to verify the proposed scheme, the following conclusions are drawn: (1) As the number of UAVs in the cell increases, the interference intensity of the neighboring cell increases rapidly. (2) The power control scheme based on user altitude grouping can effectively reduce the interference to the ground users, but it will bring a certain degree of performance degradation of the drone. (3) The power control scheme based on reference signal receiving power can improve the overall performance of the drone while effectively reducing the interference to the ground users by considering the different strengths of drones causing interference to the neighboring cell.
Keywords: Unmanned aerial vehicles Power control Reference signal receiving power Interference mitigation
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