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Full-duplex (FD) cellular networks are considered in which a FD base station(BS) simultaneously supports a set of half-duplex (HD) downlink (DL) users anda set of HD uplink (UL) users. The transmitter and the receiver of the BS areequipped with reconfigurable antennas, each of which can choose its transmit orreceive mode from several preset modes. Under the no self-interferenceassumption arisen from FD operation at the BS, the sum degrees of freedom (DoF)of FD cellular networks is investigated for both no channel state informationat the transmit side (CSIT) and partial CSIT. In particular, the sum DoF iscompletely characterized for no CSIT model and an achievable sum DoF isestablished for the partial CSIT model, which improves the sum DoF of theconventional HD cellular networks. For both no CSIT and partial CSIT models,the results show that the FD BS with reconfigurable antennas can double the sumDoF even in the presence of user-to-user interference as both the numbers of DLand UL users and preset modes increase. It is further demonstrated that suchDoF improvement indeed yields the sum rate improvement at the finite andoperational signal-to-noise ratio regime.

Degrees of Freedom of Full-Duplex Cellular Networks with Reconfigurable Antennas at Base Station