On the capacity of a class of relay channels with orthogonal components and noncausal state information at source

Authors:
Abdellatif Zaidi;Shlomo Shamai;Pablo Piantanida;Luc Vandendorpe
Affiliations:
École Polytechnique de Louvain, Université catholique de Louvain, Belgium;Department of EE, Technion-Israel Institute of Technology, Haifa, Israel;Department of Telecommunications, SUPELEC, Gif-sur-Yvette, France;École Polytechnique de Louvain, Université catholique de Louvain, Belgium
Venue:
ISWPC'10 Proceedings of the 5th IEEE international conference on Wireless pervasive computing
Year:
2010

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Abstract

We study the capacity of a class of state-controlled relay channels with orthogonal channels from the source to the relay and from the source and relay to the destination. The channel states are assumed to be known, non-causally, to only the source. This model is useful for relaying in the context of cognition and certain interference-aware networks. For the discrete memoryless case, we establish lower bounds on the channel capacity. For the memoryless Gaussian case, we establish lower and upper bounds on the channel capacity. The upper bound is strictly better than the cut-set upper bound, and is tight for certain special cases.