| In recent years,with the deepening of research on aircraft technology,unmanned aerial vehicles(UAVs)have been widely used in military and civilian fields due to their low cost and small casualties.The reliable communication of the UAV data link is an important prerequisite for ensuring the normal operation of the UAVs.However,the wireless signal is affected by the small-scale fading of the UAV channel during transmission,which leads to the performance degradation.Therefore,research on anti-fading technology in the UAV data link is very critical.In this paper,a data transmission scheme based on SC-FDE technology is designed for the data communication link of UAV,and the experimental design based on Universal Software Radio Platform(USRP)is carried out for the designed scheme.The contributions of the thesis are as follows:(1)Single antenna and multiple-input multiple-output(MIMO)transmisson schemes based on SC-FDE technology in UAV scene are designed based on the system parameters required by the collaborated company.And the SC-FDE schemes are simulated and analyzed over the classic UAV channel models.(2)In order to explore the influence of the nonlinear effects of power amplifiers,the classical power amplifier nonlinear models,such as Rapp,Saleh,Ghorbani,is used to simulate and analyze the error performance of the designed scheme under nonlinear distortion conditions.(3)The operating principle and construction method of the software radio platform are investigated.Based on the cost and design requirements,the software radio platform used for the implementation of schemes in the thesis was completed by the combination of GNURadio+USRP B210.(4)The single-antenna and MIMO systems designed in this thesis are implemented by using the software radio platform of GNURadio+USRP B210.The data transmission experiments are carried out to verify the feasibility of the scheme.The performance difference between the single antenna scheme and the MIMO scheme are evaluated. |
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