An extended etkin-type outer bound on the capacity of the Gaussian interference channel

Several genie-aided approaches have been used in the past to derive capacity outer bounds for the interference channel. In this paper, we provide an outer bound based on the genie-aided approach devised by Etkin for upper bounding the sum-rate. Namely, we extend Etkin´s bound to upper bound a weighted sum-rate, which yields an outer bound on the capacity region. Some previously known bounds are special cases of the obtained outer bound, and hence the new bound is tighter. We also derive some bounds on the genie parameters, which must be satisfied in order to obtain a non-trivial bound.