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In this paper, capacity bounds for the two-user Interference Channel (IC)with cooperative receivers via conferencing links of finite capacities isinvestigated. The capacity results known for this communication scenario arelimited to a very few special cases of the one-sided IC. One of the majorchallenges in analyzing such cooperative networks is how to establish efficientcapacity outer bounds for them. In this paper, by applying new techniques,novel capacity outer bounds are presented for the ICs with conferencing users.Using the outer bounds, several new capacity results are proved for interestingchannels with unidirectional cooperation in strong and mixed interferenceregimes. A fact is that the conferencing link (between receivers) may beutilized to provide one receiver with information about its correspondingsignal or its non-corresponding signal (interference signal). As a remarkableconsequence, it is demonstrated that both strategies can be helpful to achievethe capacity of the channel. Finally, for the case of Gaussian IC, it ismathematically shown that our outer bound is strictly tighter than the previousone derived by Wang and Tse.

Novel Outer Bounds and Capacity Results for the Interference Channel with Conferencing Receivers