Dual-Function Radar Communication Signal Design Based On Antenna Control

As a research focus in radio technology,dual-function radar communication(DFRC),which can efficiently solve problems such as spectrum scarcity and multi-functional integration of electronic equipment,has important research significance and application value.To control the antennas of the transmit and receive arrays,this thesis applies antenna selection and beamforming technology to multiple input multiple output(MIMO)DFRC system.The research focuses on the DFRC signal design based on antenna control in spatial domain.The main contents are summarized as follows:1.In order to embed information into the emission of MIMO radar for single user,without loss of generality,a MIMO DFRC signal design method based on sparse transmit array and generalized spatial modulation(GSM)is proposed considering the connectivity between the sparse transmit array of MIMO radar and GSM.Different sparse transmit array structures are used as communication symbols for communication information embedding.Two effective methods for selecting and detecting communication symbols are introduced.A joint beamforming method for MIMO radar is presented based on the sparse transmit array established by the communication dictionary.The joint design between radar and communication is further studied under this system model.2.In order to achieve the integration of multi-user communication and radar detection,a multi-user MIMO(MU-MIMO)DFRC signal design method based on sparse transmit array and GSM is proposed.Different sub-array structures are used as communication symbols to achieve multi-user communication information embedding.Effective multi-user dictionary construction scheme and communication symbol detection scheme are introduced based on radar and communication’s independent and joint designs.A joint beamforming method for MIMO radar is presented based on the sparse transmit array established by the multi-user communication dictionaries.3.In order to achieve the MIMO radar-centered receive spatial modulation(RSM)for single user,a DFRC signal design based on linearly constrained power distribution(LCPD)is proposed.The transmit covariance matrix is designed to achieve the power distribution between the radar target and the communication receive antennas.The power is concentrated to the desired communication receive antenna,and the power leakage to the remaining receive antennas is minimized so that the RSM scheme can be realized.Based on the orthogonality of MIMO radar waveforms,two modulation schemes are introduced,in which the communication symbols are the index vector and the index matrix of the communication receive antennas.The proposed method is further expanded to achieve GSM.4.In order to achieve the power distribution between the radar target and the multiuser communication,an MU-MIMO DFRC method based on LCPD is proposed.By designing the transmit covariance matrix to realize the power distribution between the radar target and the communication users,the beamforming vector obtained by rank-1decomposition satisfies the transmit power constraint,radar beampattern constraint and signal-to-interference-plus-noise-ratio constraint simultaneously.A beampattern separation design method is developed,which further improves the flexibility and efficiency of the algorithm.