Date Added: Oct 2010
In this paper, the authors address the problem of maximizing the ergodic sum-rate of an N-user cognitive MIMO Interference Channel (IC) formed by unlicensed (or secondary) users. They assume that N secondary users coexist in the same area and try to access the same set of frequency bands. In such a setup, they define a cognitive MIMO IC as an extension of a classical IC where each user has multiple antennas and multiple frequency bands for transmission. They further assume a typical cognitive radio scenario where the structure of interference signals is not known and interference cancelation is not possible.