An Achievable Rate Region for Interference Channels with One Cooperating Transmitter

A previously established inner bound on the capacity region of two-sender, two-receiver interference channels where one transmitter knows both messages is evaluated for Gaussian channels. The inner bound is based on strategies that generalize prior work, and include rate-splitting, Gel´fand-Pinsker coding and cooperative transmission. The bound is shown to outperform existing schemes. In this context, coding against the interference known at the transmitter is also discussed. It is shown that, when the interference is a codebook, superposition coding can outperform Gel´fand-Pinsker binning.