Joint design of communication and radar transceiver in spectrum-sharing architectures

In this work, we consider the joint design of a multi-antenna communication system and a non-scanning radar sharing the same bandwidth. The radar emits encoded pulses, and the communication system transmits space-time codewords whose duration equals the pulse repetition time of the radar. The degrees of freedom for system optimization are the space-time linear precoder and decoder of the communication system and the linear filters adopted by the radar for pulse compression at different range bins. In this framework, we minimize the mutual information at the communication system under a constraint on the minimum signal-to-disturbance ratio for each inspected range bin at the radar side and on the transmit powers. An approximate solution to this optimization problem is found using a block coordinate ascent method, and a numerical example is provided to show the merits of the proposed design.