The Capacity of the Semi-Deterministic Cognitive Interference Channel and Its Application to Constant Gap Results for the Gaussian Channel

Date Added: Feb 2011
Format: PDF

The Cognitive InterFerence Channel (C-IFC) consists of a classical two-user interference channel in which the message of one user (the "Primary" user) is non-causally available at the transmitter of the other user (the "Cognitive" user). They obtain the capacity of the semi-deterministic C-IFC: a discrete memoryless C-IFC in which the cognitive receiver output is a noise-less deterministic function of the channel inputs. They, then use the insights obtained from the capacity-achieving scheme for the semi-deterministic model to derive new, unified and tighter constant gap results for the complex-valued Gaussian C-IFC.