Waveform Design For Integrated Radar And Communication Systems Based On DFT-S-OFDM

With the development of integrated circuit and digital signal processing technology,the radiofrequency front-end architecture of radar and wireless communication has become more and more similar,so the joint radar and wireless communication radiofrequency hardware platform can be realized by the state-of-the-art technologies.Considering spectrum efficiency and cost-effectiveness,the integration of radar and communication has become the development trend of future electronic information systems.Waveform design of integrated radar and communication system is one of the core issues to realize the integration of radar and communication,which directly affects the structure of system's transmitter and receiver,signal processing methods,as well as the resulting system performance.This thesis studies the waveform design of integrated radar and communication systems,and presents different methods of integrated waveform design in discrete Fourier transform-spread-orthogonal frequency division multiplexing(DFT-S-OFDM)-based systems.The main contributions of the work are summarized as follows:Firstly,this thesis designs a integrated radar and communication scheme based on DFTS-OFDM and studies the performance of communication information embedded DFT-SOFDM radar signal.Both communication performance and radar performance are simulated and analyzed.From the communication perspective,we mainly study the peak to average power ratio(PAPR)and system error rate.From the radar perspective,the mean ambiguity function of the DFT-S-OFDM signal is derived.Meanwhile,we analyze the influence of system parameters on radar detection performance.The results of radar parameters estimation in the vehicle environment are obtained by simulations,and the corresponding relationship between system parameters and radar performance is obtained,which provides a theoretical basis for the design of integrated radar and communication based on DFT-S-OFDM technology.Secondly,we study the waveform design of integrated radar and communication based on the preamble of transmitted signal in 60 GHz DFT-S-OFDM systems.We use the short training field(STF)sequence of frame structure preamble to realize radar sensing without affecting the working mechanism of the original communication systems.The STF sequence design requirements of the 60 GHz DFT-S-OFDM integrated radar and communication system under different channel bonding scenarios are summarized and analyzed,and we point out that the design of STF sequences shared by radar and communication should consider both PAPR and joint resolution.For the 2.16 GHz and 4.32 GHz channel scenarios,we use Generative Adversarial Networks(GAN)algorithm to optimize the existing STF sequences.The optimized STF sequence has better PAPR and joint resolution performance.For the 6.48 GHz channel scenario,we design STF sequences shared by radar and communication based on Golay complementary pairs.Compared with the existing STF,the newly designed STF has better PAPR while ensuring the overall joint resolution performance,which can better meet the requirements of integrated radar and communication system based on DFT-S-OFDM.In summary,this thesis investigates two different ways to design the waveform of integrated radar and communication systems and the obtained results can provide new ideas for the future realization of integrated radar and communication systems.