Linear Degrees of Freedom of Full-Duplex Cellular Networks with Reconfigurable Antennas

We derive the linear degrees of freedom (DoF) of a cellular network without channel state information at the transmit sides in which the base station operates in a full-duplex mode, and the base station and users are equipped with reconfigurable antennas which can switch among their preset modes. To derive an inner-bound, we propose an achievable scheme to align interferences from uplink users to downlink users via preset mode switching of reconfigurable antennas. The key concept of our scheme is to align the interfering signals of uplink transmission at the downlink users, through the identical preset mode pattern over the multiple of downlink transmissions and silences of the base station. We also develop an outer-bound on the linear sum DoF of the cellular network, which matches up with the inner-bound.