Research Frequency Domain Equalization In Unmanned Aerial Vehicle In Single-Carrier Communication System

As an unmanned aircraft,unmanned aerial vehicles have been used more and more widely in the military and civilian fileds.The reliable communication of UAV is very important,and it is the guarantee for UAV to perform various tasks.The UAV communication is a kind of radio communication,it is very important to study reliable communication under UAV radio channel.This paper first introduces the characteristics of the radio channel,the characteristics of UAV under the different flying states.Then,the performance of the UAV system using frequency domain equalization is studied in the mission area and the take-off/landing area.This paper introduces the common linear equalization and nonlinear equalization algorithms,and compares the performance of the UAV system under the various equalization algorithms.Under the time-varying channels,the frequency domain channel estimation and time domain channel estimation are analyzed and compared using the guard interval in the block.With the rapid development of UAV,the combat style of the UAV has been developed from single UAV to multi-UAV networking combat.Multi-UAV system has stronger survivability,higher scalability,faster completion of tasks,higher success rate and other advantages.Therefore,this paper proposes a simple networking method of the UAV based on the frame structure.The main contents of this paper are as follows :The first chapter of this paper summarizes the development of UAV and its wide application in various fields,and introduces the development of single carrier equalization technology.In the second chapter,we introduce the characteristics of the wireless channel in the first,and focus on the small scale fading characteristics of the wireless channel and the characteristics of the UAV channel in the different flight conditions.And we introduce the frame structure of UAV communication system.In the third chapter,we firstly introduce the principle of single carrier frequency domain equalization system.Then we introduce two common linear equalization algorithms,and analyze the performance of MMSE frequency domain in UAV channel.Then we introduce the decision feedback equalization algorithm :the MMSE-RISIC and FDE-NP algorithms.Finally,the performance of the proposed algorithm is compared in the UAV channel.In the fourth chapter,we introduce the method of frequency domain channel estimation and time domain channel estimation using the guard interval in the data block under time-varying channel,and compare the performance of the two channel estimation methods.At last,we introduces the realization of network based on frame structure.