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The Capacity of the Interference Channel with a Cognitive Relay in Very Strong Interference

The interference channel with a cognitive relay consists of a classical interference channel with two sourcedestination pairs and with an additional cognitive relay that has a priori knowledge of the sources' messages and aids in the sources' transmission. We derive a new outer bound for this channel using an argument originally devised for the "more capable" broadcast channel, and show the achievability of the proposed outer bound in the "very strong interference" regime, a class of channels where there is no loss in optimality if both destinations decode both messages. This result is analogous to the "very strong interference" capacity result for the classical interference channel and for the cognitive interference channel, and is the first capacity known capacity result for the general interference channel with a cognitive relay.

preprint2011arXivOpen access
Stefano RiniyDaniela TuninettiNatasha DevroyeAndrea Goldsmith
math.ITInformation Theory
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Stefano RiniyDaniela TuninettiNatasha DevroyeAndrea Goldsmith

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