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In this paper, we study the effect of the absence of channel knowledge formultiple-input-multiple-output (MIMO) networks. Specifically, we assume perfectchannel state information at the receivers, no channel state information at thetransmitter(s), and independent identically distributed (i.i.d.) Rayleighfading across antennas, users and time slots. We provide the characterizationof the degrees of freedom (DoF) region for a 2-user MIMO broadcast channel. Wethen provide a DoF region outer bound for a 2-user MIMO interference channel.This bound is shown to be tight for all possible combinations of the number ofantennas at each node except for one case. As a byproduct of this analysis wepoint out the potential of interference alignment in the 2-user MIMOinterference channel with no CSIT.

On Degrees of Freedom Region of MIMO Networks without CSIT