The Gaussian Interference Relay Channel With a Potent Relay

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Executive Summary

The authors consider the Gaussian interference channel with an intermediate relay. The relay is assumed to have abundant power and is named potent for that reason. A main reason to consider this model is to find good outer-bounds for the Gaussian InterFerence Relay Channel (GIFRC) with finite relay power. By setting the power of the relay constraint to infinity, they show that the capacity region is asymptotically equivalent to the case when the relay-destination links are noiseless and orthogonal to other links. The capacity region of the latter provides an outer-bound for the GIFRC with finite relay power. They then show the capacity region of the former can be upper bounded by a single-input-multiple-output interference channel with an antenna common to both receivers.

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