Integrated Radar and Communication Waveform Design for Distributed MIMO Systems

In the distributed multiple input multiple output (MIMO) system with the integrated radar and communication (IRAC) waveform transmitted, the synthesized transmit beampattern usually suffers from high sidelobes. To decrease the sidelobes of the transmit beampattern and accomplish radar and communication functions simultaneously in the distributed MIMO system, this paper proposes two IRAC waveform design methods. First, to minimize the maximal sidelobe of the transmit beampattern, this paper proposes the IRAC waveform design method with low sidelobes, and the designed IRAC waveform can produce the desired radar waveform in the target direction and communication waveform in the user direction, respectively. However, the designed IRAC waveform may have non-constant modulus, and it will be distorted if the power amplifier works in the saturation region. Then, to make sure the modulus of the designed IRAC waveform is constant, this paper proposes the IRAC waveform design method with constant modulus. In addition to producing the desired waveforms, the designed IRAC waveform has constant modulus. Moreover, the transmit beampattern has low sidelobes. Finally, the simulation results show that the proposed IRAC waveform design methods can simultaneously accomplish radar and communication functions and form the transmit beampattern with low sidelobes.