Combining superposition coding and binning achieves capacity for the Gaussian cognitive interference channel

Stefano Rini*, Ernest Kurniawan, Andrea Goldsmith

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

The cognitive interference channel models cognitive overlay radio systems, in which cognitive radios overhear the transmission of neighboring nodes. For the Gaussian case capacity is known in three subsets of the parameter space: the 'weak interference', 'very strong interference' and 'primary decodes cognitive' regime. Capacity in the 'very strong interference' regime is achieved by superposing the cognitive message over the primary message while in the 'primary decodes cognitive' regime the cognitive message is binned against the primary message. This paper provides a new capacity result obtained by combining the capacity achieving schemes in these two regimes thus generalizing and extending these results. Interestingly, the capacity achieving strategy for a given channel also depends on the level of cooperation among the users: that is, either superposition coding or binning is employed depending on the amount of power allotted by the cognitive transmitter to aid the primary user.

Original languageEnglish
Title of host publication2012 IEEE Information Theory Workshop, ITW 2012
Pages227-231
Number of pages5
DOIs
StatePublished - 1 Dec 2012
Event2012 IEEE Information Theory Workshop, ITW 2012 - Lausanne, Switzerland
Duration: 3 Sep 20127 Sep 2012

Publication series

Name2012 IEEE Information Theory Workshop, ITW 2012

Conference

Conference2012 IEEE Information Theory Workshop, ITW 2012
CountrySwitzerland
CityLausanne
Period3/09/127/09/12

Keywords

  • binning
  • capacity
  • cognitive interference channel
  • superposition coding

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    Rini, S., Kurniawan, E., & Goldsmith, A. (2012). Combining superposition coding and binning achieves capacity for the Gaussian cognitive interference channel. In 2012 IEEE Information Theory Workshop, ITW 2012 (pp. 227-231). [6404664] (2012 IEEE Information Theory Workshop, ITW 2012). https://doi.org/10.1109/ITW.2012.6404664