Waveform Design Of On-vehicle Radar-communication Integrated Signal Based On OFDM And Simulation Analysis

With the rapid development of V2X,intelligent vehicles gradually enter people's vision.Intelligent vehicles need to communicate with each other and get each other's driving status.In this process,communication signals are used to communicate between vehicles,radar signals are used by vehicles to sense each other's driving state.In order to improve frequency band utilization and avoid electromagnetic inteference between radar and communication equipment,the sharing of radar and communications has become a hot issue.With the continuous development of radar and communications,the communication and radar bands overlap,this makes it possible to realize the integration of radar and communication.The waveform design of radar-communication integrated signal and eaco signal processing are important process of achieving integration of radar and communicaton.In the existing waveform,as a radar signal,OFDM has the advantages of high frequency band utilization and multipath resistance,as a radar signal,OFDM has good pulse compression characteristics.Therefore,designing a radar-communication integrated signal based on OFDM and designing velocity and range measurement algorithm are of great significance.In this paper,the following work has been done for radar-communication integrated signal of OFDM.Firstly,the difference between radar system and communication system is analyzed.Based on OFDM,analyze the instructure of radar-communication integrated signal of OFDM in detail from two aspects of working mode and signal model.In V2 X,the parameters of OFDM radar-communication integrated signal are discussed,and the ambiguity function is analyzed.Secondly,the coding methon of OFDM radar-communication integrated signal is simulated and analyzed,an OFDM radar-communication integrated signal coding algorithm based on genetic algorithm is proposed.Under the matching filter receiving condition,coding is need to reduce the impact of communication information on radar performance.By deriving ambiguity function of OFDM radar-communication integrated signal,we get the influence factors of information carried on OFDM radar communication integrated signal on the detection performance,and based on this influence,an OFDM radar-communication integrated signal coding algorithm based on genetic algorithm is proposed.Compared with P4 code and chaotic code,the simulation results of radar and communication are considerd,the proposed encoding has better effect.Thirdly,in order to futher improve the system performance,the algorithm of velocity and range measurement based on OFDM radar-communication integrated signal is sumulated and analyzed.The echo signal model is derived,and the algorithm of velocity and range measurement based on maximum likelihood and the algorithm of velocity and range measurement based on IMUSIC are analyzed in detail.As for the problem of high complexity of these two algorithm,gradient descent and dimensionality reduction are used to optimize the algorithm,the the algorithm of velocity and range measurement based on gradient and dimensionality and the algorithm of velocity and range measurement based on RD-IMUSIC are proposed.The three algorithms are compared and analyzed,the results show that the complexity of RD-IMUSIC is lower than the other two algorithms,the RD-IMUSIC measurement accuracy is similar to that of the two algorithms.