The Gaussian MAC with conferencing encoders

Shraga I. Bross, Amos Lapidoth, Michele A. Wigger

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    64 Scopus citations

    Abstract

    We derive the capacity region of the Gaussian version of Willems's two-user MAC with conferencing encoders. This setting differs from the classical MAC in that, prior to each transmission block, the two transmitters can communicate with each other over noise-free bit-pipes of given capacities. The derivation requires a new technique for proving the optimality of Gaussian input distributions in certain mutual information maximizations under a Markov constraint. We also consider a Costa-type extension of the Gaussian MAC with conferencing encoders. In this extension, the channel can be described as a two-user MAC with Gaussian noise and Gaussian interference where the interference is known non-causally to the encoders but not to the decoder. We show that as in Costa's setting the interference sequence can be perfectly canceled, i.e., that the capacity region without interference can be achieved.

    Original languageEnglish
    Title of host publicationProceedings - 2008 IEEE International Symposium on Information Theory, ISIT 2008
    Pages2702-2706
    Number of pages5
    DOIs
    StatePublished - 2008
    Event2008 IEEE International Symposium on Information Theory, ISIT 2008 - Toronto, ON, Canada
    Duration: 6 Jul 200811 Jul 2008

    Publication series

    NameIEEE International Symposium on Information Theory - Proceedings
    ISSN (Print)2157-8101

    Conference

    Conference2008 IEEE International Symposium on Information Theory, ISIT 2008
    Country/TerritoryCanada
    CityToronto, ON
    Period6/07/0811/07/08

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