Unmanned aerial vehicles (UAVs)-based applications, such as surveillance systems and wireless relays, are attracting increasing attention from academia and industrial fields. The high-performance aerial communication system is one of the key enablers for them. However, due to the low attenuation of radio waves in the air-to-ground channels, the interference between aerial and terrestrial communication systems would significantly deteriorate their communication performance and greatly limit the potential UAV applications. To address the problem, in this paper, the spectrum sharing strategy between a multiple UAV communication system, in which both UAVs and ground station (GS) are equipped with directional antennas, and terrestrial systems is proposed. The GS position is selected and the flyable areas of the UAVs using certain spectrum resources are defined in advance using prior knowledge from spectrum monitoring on terrestrial communication systems to minimize interference and maximize the flyable areas of the UAVs instead of the low-efficient dynamic channel sensing and allocation for interference elimination. The simulations are conducted through a case study of the spectrum sharing between a multi-UAV video transmission system and the terrestrial wireless local area network (WLAN) system in the 5.7GHz band. The simulation results show that thanks to the proposed system the entire area can be enabled for UAV flight.
翻译:无人驾驶航空飞行器(无人驾驶飞行器)基于无人驾驶航空飞行器(无人驾驶飞行器)的应用程序,如监视系统和无线继电器等,正在吸引学术界和工业领域日益引起注意,高性能空中通信系统是这些系统的主要辅助手段之一,但是,由于空对地频道无线电波的衰减率较低,空中和地面通信系统之间的干扰将大大降低其通信性能,并大大限制无人驾驶航空飞行器的潜在应用;为了解决本文件中的问题,在多个无人驾驶飞行器通信系统(无人驾驶飞行器和地面站都配有定向天线的)和地面系统之间共享频谱战略,并提议地面系统;选择了航空飞行器的GS职位,并预先确定了使用某些频谱资源的无人驾驶飞行器可飞区域;利用地面通信系统频谱监测的先期知识,以尽量减少干扰并最大限度地扩大无人驾驶飞行器可飞区域,而不是低效率的动态信道感测和分配消除干扰;为解决这一问题,通过对多乌航录像传输系统和地面无线局局局域网之间的共享进行个案研究进行模拟。