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We study the two-user interference channel where the source nodes may transmit and receive in half-duplex while the destinations only receive as usual. Depending on the sources, the channel can be in one of three modes: A) both sources transmit, B) source 1 transmits while source 2 receives, and C) source 2 transmits and source 1 receives. This allows a limited form of cooperation between the sources. In this paper, we focus on the corresponding symmetric linear deterministic channel and derive its sum capacity. We consider a scheme which, by operating in modes B and C, transforms mode A into a virtual two-user interference channel with rate-limited bit pipes between the two source nodes and from each source node to the destination node it causes interference to. For the virtual channel so created, we propose a generalization of the superposition coding scheme of Han-Kobayashi to take advantage of the bit pipes. Finally, we derive matching upperbounds to show that the performance of the composite scheme is indeed optimal for the original channel.
Date of Conference: 13-18 June 2010