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We study the degrees of freedom (DoF) regions of two-user multiple-inputmultiple-output (MIMO) Z and full interference channels in this paper. Weassume that the receivers always have perfect channel state information. Wefirst derive the DoF region of Z interference channel with channel stateinformation at transmitter (CSIT). For full interference channel without CSIT,the DoF region has been fully characterized recently and it is shown that thepreviously known outer bound is not achievable. In this work, we investigatethe no-CSIT case further by assuming that the transmitter has the ability ofantenna mode switching. We obtain the DoF region as a function of the number ofavailable antenna modes and reveal the incremental gain in DoF that each extraantenna mode can bring. It is shown that in certain cases the reconfigurableantennas can bring extra DoF gains. In these cases, the DoF region is maximizedwhen the number of modes is at least equal to the number of receive antennas atthe corresponding receiver, in which case the previously outer bound isachieved. In all cases, we propose systematic constructions of the beamformingand nulling matrices for achieving the DoF region. The constructions bear aninteresting space-frequency interpretation.

Degrees of Freedom Regions of Two-User MIMO Z and Full Interference Channels: The Benefit of Reconfigurable Antennas