Waveform Design And Experimental Verification Of UAV Self-organizing Network

Due to its flexible networking,high data transmission rate,strong adaptability and survivability,UAV ad hoc network has become a research hotspot in the future mobile communication network.This paper designs a transmission waveform of UAV ad hoc network to meet the requirements of anti-interference,anti Doppler frequency offset,anti multipath,low peak to average ratio of UAV ad hoc network communication.The waveform scheme is simulated and verified by FPGA.Finally,it is tested on the software radio platform.The main work of this paper is as follows:First,the transmission waveform requirement of UAVs ad hoc network is analyzed.According to the analysis of channel characteristics of UAV ad hoc network,it is determined to use high-speed digital frequency hopping Anti-Jamming to meet the needs of practical application scenarios.According to the requirement of system peak to average power ratio and carrier frequency offset analysis,the SC-FDE technology is used as the physical layer digital baseband processing scheme.According to the waveform loss of the transmission link,the credibility of the transmission waveform is determined.Secondly,a waveform scheme is designed to meet the performance and business requirements,and the feasibility of the waveform design scheme is verified by MATLAB simulation.In AWGN channel,the acquisition probability of time coarse synchronization can reach 1 when SNR is greater than or equal to 1dB.The least square channel estimation in frequency domain and the least mean square error equalization algorithm used in the link can resist the frequency offset about 800Hz.In AWGN channel,when the bit SNR is greater than or equal to 5dB,the designed link bit error rate is less than10^-6.Thirdly,the design of the transmission waveform of UAV ad hoc network is implemented by FPGA.After the engineering platform and the overall framework of physical layer are given,the implementation of the key elements of physical layer of transmitter and receiver is introduced in detail.The resources and timing in the implementation are analyzed and optimized to verify the feasibility of the design.Fourthly,based on the software radio platform,the FPGA verification and test of the transmission waveform scheme are carried out in the self looping and desktop wireless short distance scenarios.The test results show that the acquisition performance of the actual hardware board test is about 1dB worse than that of the simulation test,but it can still meet the requirements of the system acquisition performance;the bit error rate performance of the hardware test is about 1dB worse than that of the link simulation,but it still meets the performance requirements of the realization of the link.To sum up,this paper designs a waveform scheme to meet the requirements of anti-interference,anti Doppler frequency offset,anti multipath,low peak to average ratio of UAV ad hoc network communication,and carries out FPGA implementation and test to verify the feasibility of the waveform scheme,which provides a reference for the research of waveform transmission technology of UAV ad hoc network.