Research On Key Technologies Of Wireless Communication Sensing Integrated Waveform

With the development of wireless technology,the similarity between wireless communication and sensing functions in terms of equipment and resource usage has become more and more prominent.To improve the efficiency of resource utilization,integrated sensing and communication(ISAC)technology has been widely studied at the equipment,spectrum,and space-time levels.In this thesis,a mutual interference model under different scenarios is built for the time-division ISAC system,and an integrated waveform optimization study based on Filter Bank Multi-Carrier(FBMC)baseband modulation structure is carried out.The main work and contributions are as follows:(1)Analyses of time-division ISAC system based on FBMC.Summarize and analyze the ISAC system and multiplexing methods,Compare the advantages and disadvantages of communication and radar waveforms.The ISAC system is built and the basic assumptions and description of its operation are made.The derivation of the system signal interference to noise ratio(SINR)is carried out for three cases: the ideal case of no interference between the communication and radar ends,the communication base station(BS)side being interfered by the radar scattered signal,and the communication user equipment(UE)side being interfered by the radar echo signal.(2)Optimized waveform design based on time-division ISAC system.Based on the scenario and interference models,a joint optimization model of the ISAC system is established,which is transformed into alternate optimization by maximizing a single system objective and multiple objectives into single-objective variable optimization,respectively,and solved by successive convex approximation.At the communication aspect,a filter satisfying Nyquist inter-code interference-free is obtained by optimization,and at the radar aspect,the transmit sequence is optimized by enhance the correlation of FBMC signals and enhance the radar signal detection and target estimation.The results demonstrate that alternate optimization by maximizing a single system objective yields better results.(3)Study of time slot distribution optimization and performance based on optimal radar communication integration waveform.Different integration application scenario models are set to optimize the communication-aware time slot distribution.An optimization model with communication mutual information,system throughput and radar detection probability as the objective function is established,and the time-domain time allocation problem is transformed into an integer programming problem with FBMC symbols as the period to solve for the optimal time slot allocation under different scenarios.Finally,the complete integrated system operation process is constructed,and the optimization results are simulated.The results show that the overall performance of the FBMC waveform-based time-division ISAC system is greatly improved after the optimization of time slot distribution,communication transmission filter and radar transmission sequence.