Sum-Rate Capacity for Symmetric Gaussian Multiple Access Channels with Feedback

The feedback sum-rate capacity is established for the symmetric three-user Gaussian multiple-access channel (GMAC). The main contribution is a converse bound that combines the dependence-balance argument of Hekstra and Willems (1989) with a variant of the "doubling trick" of Geng and Nair...

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Bibliographic Details
Main Authors: Sula, Erixhen, Gastpar, Michael, Kramer, Gerhard
Format: Conference Proceeding
Language:English
Online Access:Request full text
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Summary:The feedback sum-rate capacity is established for the symmetric three-user Gaussian multiple-access channel (GMAC). The main contribution is a converse bound that combines the dependence-balance argument of Hekstra and Willems (1989) with a variant of the "doubling trick" of Geng and Nair (2014). The converse bound matches the achievable sum-rate of the Fourier-Modulated Estimate Correction strategy of Kramer (2002). The proof arguments extend to GMACs with more than three users.
ISSN:2157-8117
DOI:10.1109/ISIT.2018.8437691