Feedback improves the generalized degrees of freedom of the strong interference channel
We provide inner and outer bounds on the generalized degrees of freedom of the two user symmetric interference channel. The bounds are tight in the moderately weak and strong interference regimes. Feedback is shown to provide unbounded improvements to the generalized degrees of freedom of the two user interference channel in the very strong interference regime. It is also shown that feedback does not improve the GDOF of the channel if the interference is moderately weak or moderately strong. We also finally present bounds for the generalized degrees of freedom of the symmetric MIMO interference channel with feedback.
(This report is the exact paper submitted to IEEE GLOBECOM for review, April 1, 2008 on EDAS. Uploaded, for the record, as CPCC report in Oct. 2011.)