  The paper considers a scenario where a base station (BS), equipped with a
large-scale antenna array, execute, using the same frequency range, both
communication with mobile users and radar surveillance of the surrounding
environment, relying on the ability of the massive MIMO array to synthesize
multiple narrow beams. Based on an OFDM signaling format for both communication
and surveillance tasks, a lower bound to the system achievable downlink rate is
provided, along with a GLRT detection rule that does not require any knowledge
about the target parameters. Then, a power allocation strategy is proposed,
aimed at maximizing the fairness across the mobile users, while guaranteeing a
minimum signal to interference ratio threshold value for the radar system.
Numerical results show that the system performs effectively, and that the power
control procedure helps in improving the system fairness.
