On the Capacity and Degrees of Freedom Regions of MIMO Interference Channels with Limited Receiver Cooperation

摘要

This paper gives the approximate capacity region of a two-user MIMOinterference channel with limited receiver cooperation, where the gap betweenthe inner and outer bounds is in terms of the total number of receive antennasat the two receivers and is independent of the actual channel values. Theapproximate capacity region is then used to find the degrees of freedom region.For the special case of symmetric interference channels, we also find theamount of receiver cooperation in terms of the backhaul capacity beyond whichthe degrees of freedom do not improve. Further, the generalized degrees offreedom are found for MIMO interference channels with equal number of antennasat all nodes. It is shown that the generalized degrees of freedom improvegradually from a "W" curve to a "V" curve with increase in cooperation in termsof the backhaul capacity.