Date Added: Nov 2009
The understanding of fundamental performance limits in wireless networks is one of the main foci of current wireless research. Insightful and popular performance measures in this context are degrees of freedom. This measure is particularly meaningful in the regime of high signal-to-noise ratio, where it is the key indicator for spectral efficiency. As a prominent example for results of this kind, it has recently been shown in that n/2 degrees of freedom are achievable in an n-user interference network with single-antenna terminals in sufficiently frequency selective or time variant environments. This insight has triggered a lot of research activity in the field, and in the meanwhile significant progress in the characterization of the ergodic capacity of such networks has been made.