MIMO waveform design for radar and communication integrated system in the presence of active interferences

Abstract

In this paper, we propose a modified space-time coding scheme to design transmit waveform for the radar and communication integrated system in the presence of active interferences. Based on the shared co-located MIMO radar, the constraints of communication requirement, waveform orthogonality and active anti-interference are considered for the waveform design. To avoid the loss of information symbols for communication transmission and obtain sufficient anti-interference performance for radar detection, the transmit beam-pattern at each sub-pulse duration time is controlled to maintain the radiation powers unchanged towards communication direction and interference directions, which is distinct to the conventional transmit beamforming design. Furthermore, to tackle the coupling of the time-domain orthogonality and the space-domain beam-pattern, the constant envelope constraint of transmit waveform is relaxed to obtain the degree of freedom for space-time waveform design. Thus the peak-to-average power ratio (PAPR) reduction for transmit waveform is also discussed. Simulation results are finally presented to demonstrate the effectiveness of the proposed methods.