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This paper studies two-user MIMO interference channel with isotropic fading.We assume that users are equipped with arbitrary number of antennas and thechannel state information (CSI) is available at receivers only. An outer boundis obtained for the degree of freedom region, which suggests the loss ofdegrees of freedom due to the lack of CSI at transmitters under manycircumstances.

Isotropic MIMO Interference Channels without CSIT: The Loss of Degrees of Freedom