In this paper, we consider a heterogeneous network composed of a full-duplex macrocell and a half- duplex femtocell. The macro-base station (BS) is equipped with L antennas where each antenna can be utilized either for downlink transmission or uplink reception. On the other hand, the femto-BS is equipped with M antennas that are used for downlink transmission. We assume that each user equipment has N antennas where L&M&N. We investigate the benefit of using interference alignment for cross-tier and full-duplex interference management and present precoding schemes that are capable of achieving the total degrees of freedom of the network. We show that full-duplex operation of the macro-BS improves the degrees of freedom (DoF) of the system when M&2N, otherwise half-duplex operation is optimal. Furthermore, the DoF of the system can be improved by 50\% via full-duplex macro-BS operation when M=N.

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Keywords Cross-tier interference mitigation, Degrees of freedom, Heterogeneous networks, Interference alignment, Separate-antenna full-duplex transceivers
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Conference 59th IEEE Global Communications Conference, GLOBECOM 2016
El-Keyi, A. (Amr), & Yanikomeroglu, H. (2016). Interference alignment for heterogeneous full-duplex cellular networks. In 2016 IEEE Global Communications Conference, GLOBECOM 2016 - Proceedings. doi:10.1109/GLOCOM.2016.7841908