  This paper investigates dynamic hybrid beamforming (HBF) for a dual-function
radar-communication (DFRC) system, where the DFRC base station (BS)
simultaneously serves multiple single-antenna users and senses a target in the
presence of multiple clutters. Particularly, we apply a HBF architecture with
dynamic subarrays and double phase shifters in the DFRC BS. Aiming at
maximizing the radar mutual information, we consider jointly designing the
dynamic HBF of the DFRC system, subject to the constraints of communication
quality of service (QoS), transmit power, and analog beamformer. To solve the
complicated non-convex optimization, an efficient alternating optimization
algorithm based on the majorization-minimization methods is developed.
Simulation results verify the advancement of the considered HBF architecture
and the effectiveness of the proposed design method.
