Transmit Beampattern Optimization for MIMO-ISAC Systems with Hybrid Beamforming

This paper considers hybrid beamforming in multiple-input multiple-output integrated sensing and communications systems. In particular, the transmit hybrid beamformers are jointly designed with digital receive beamformers of users by maximizing the ratio of minimum mainlobe level to peak sidelobe level of the transmit beampattern, under constraints on the transmission power and signal-to-interference-plus-noise ratio requirements of users. In order to deal with the resulting nonconvex problem, a computationally efficient algorithm is developed under the framework of consensus alternating direction method of multipliers, by deriving the solution of each subproblem. The proposed design is verified by simulation results.