Research On Radar Communication Integrated Signal Based On FBMC Comb Spectru

With the rapid development of electronic platform,the resources of time,space and spectrum are increasingly strained,and the electromagnetic environment is more and more severe.In order to reduce electromagnetic interference,save equipment cost and relieve the pressure of spectrum resources,radar communication integration is an effective way.In recent years,research on radar communication integration has mainly focused on signal design based on orthogonal frequency division multiplexing(OFDM).However,OFDM technology has shortcomings such as doppler sensitivity and strong out-of-band radiation.In contrast,filter bank multicarrier(FBMC)technology has higher application value due to its low out-of-band radiation,high doppler tolerance,and no need for cyclic prefix(CP).Therefore,from the perspective of expanding and utilizing subcarriers and window function degrees of freedom,this thesis focuses on the research and design of radar communication integration signals based on FBMC comb spectrum.The specific research content is as follows:1.The basic model of FBMC,the process of baseband signal modulation and demodulation,and two fast implementation architectures are introduced;The influence of the intrinsic imaginary part interference of the FBMC prototype filter on channel estimation is analyzed;A preamble pilot structure integrating auxiliary pilot and interference utilization is designed,and simulation experiments are completed.Experimental results show that this structure has excellent channel estimation performance under high signal-to-noise ratio conditions.2.A design idea for radar communication integrated signal based on FBMC comb spectrum is proposed.Aiming at the problem of degradation of radar detection performance caused by inherent imaginary part interference,a chirp structure under the FBMC comb spectrum framework is optimized and designed,which greatly reduces radar communication mutual interference;Combining the preamble sequence with the FBMC chirp structure,a complete structure design method for radar communication integrated signal based on the FBMC comb spectrum is proposed,and computer simulation and comparison experiments are completed.Simulation results show that compared to OFDM comb spectrum signals,FBMC comb spectrum signals have a higher doppler tolerance and meet the requirements of high dynamic applications.3.In order to effectively verify the radar detection and wireless communication performance of FBMC comb spectrum integrated signals,a distributed experimental system based on the general software radio platform was built and field experiments were conducted.The experimental results show that the FBMC comb spectrum signal designed in this thesis has good radar detection performance and high-speed wireless communication performance.