State of the cognitive interference channel: a new unified inner bound

Abstract

The capacity region of the interference channel in which one transmitter non-causally knows the message of the other, termed the cognitive interference channel, has remained open since its inception in 2005. A number of subtly differing achievable rate regions and outer bounds have been derived, some of which are tight under specific conditions. In this work we present a new unified inner bound for the discrete memoryless cognitive interference channel. We show explicitly how it encompasses all known discrete memoryless achievable rate regions as special cases. The presented achievable region was recently used in deriving the capacity region of the general deterministic cognitive interference channel, and thus also the linear high-SNR deterministic approximation of the Gaussian cognitive interference channel. The high-SNR deterministic approximation was then used to obtain the capacity of the Gaussian cognitive interference channel to within 1.87 bits.

Presented at the 2010 International Zurich Seminar on Communications - an 2nd updated version.

References in corpus (1)

• The Capacity Region of the Cognitive Z-interference Channel with One Noiseless Component

Cited by in corpus (6)

• New inner and outer bounds for the discrete memoryless cognitive interference channel and some capacity results
• New Results on the Capacity of the Gaussian Cognitive Interference Channel
• On Achievable Rate Regions for Half-Duplex Causal Cognitive Radio Channels
• Primary Rate-Splitting Achieves Capacity for the Gaussian Cognitive Interference Channel
• A New Achievable Rate Region for the Cognitive Radio Channel
• On the Capacity of the Cognitive Interference Channel with a Common Cognitive Message