Mobility

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

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Executive Summary

This paper studies two-user MIMO interference channel with isotropic fading. The authors assume that users are equipped with arbitrary number of antennas and the Channel State Information (CSI) is available at receivers only. An outer bound is obtained for the degree of freedom region, which suggests the loss of degrees of freedom due to the lack of CSI at transmitters under many circumstances. An important advance toward the understanding of interference channels is the characterization of the capacity of the two-user Gaussian interference channel within one bit. Since, then new results have been obtained for K-user interference channels and MIMO interference channels.

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