预编码技术在无人机通信系统中的应用研究

Research on the Application of Pre-Coding Technology in UAV Communication System

随着无线通信和电子技术的发展,无人机在很多领域得到广泛应用。其通信系统大多工作在微波频段,属于视距通信范畴。为了实现对无人机的超视距指挥控制,改善无人机上下行链路的通信性能,可以依托地面有线网络将多个无人机地面站组网使用。其中,从无人机至地面站的下行链路可采用多用户MIMO的信道模型,利用预编码技术来抵御多径干扰和信道噪声。该文介绍在准确掌握信道状态信息的前提下,几种常见的预编码技术。针对无人机使用场景,对这些预编码技术进行分析对比,提出基于最大化SLNR准则的预编码技术能够在性能和复杂度之间取得较好的折中。未来,改进信道状态信息获取方法以及在掌握部分信道状态信息的条件下进行预编码设计将是重要的研究方向。

With the development of wireless communication and electronic technology,UAV is widely used in many fields.Most of its communication systems work in the microwave band and belong to the field of line of sight communication.In order to realize the over-the-horizon command and control of UAV and improve the communication performance of UAV uplink and downlink,multiple UAV ground stations can be networked by relying on the ground wired network.Among them,the downlink from UAV to ground station can adopt the channel model of multi-user MIMO,and use pre-coding technology to resist the multipath interference and channel noise.This paper introduces several common pre-coding techniques on the premise of mastering channel state information accurately.Aiming at the UAV application scenario,the paper analyzes and compares these pre-coding technologies,and proposes that the pre-coding technology based on maximizing SLNR criterion can achieve a good compromise between performance and complexity.In the future,it will be an important research direction to improve the channel state information acquisition method and pre-coding design under the condition of mastering partial channel state information.