Target Signal Power Improvement and Clutter Suppression via Beamforming for Integrated Sensing and Communication Systems

This paper focuses on the transmit and receive beamforming design of an integrated sensing and communication system. In particular, a base station transmits waveform for simultaneous downlink multiuser communication as well as radar sensing, and spatial filter is performed for receive echos to reduce the clutter caused by communications users. We use mainlobe ripple control to ensure that this system shows similar sensing performance for any angle in this region. The transmit beamforming design is formulated as an optimization problem to maximize the minimum mainlobe power. The receive beamforming is designed by maximizing the ratio of the minimum beam response in the main lobe region to the maximum beam response in the directions of communication users. Numerical results show that the proposed beamforming scheme can not only guarantees the communication quality, but also utmostly improve the sensing performance.