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Dependence Balance and the Gaussian Multiaccess Channel with Feedback

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2 Author(s)
Kramer, G. ; Communications and Statistical Sciences Dept., Bell Labs, Lucent Technologies, 600 Mountain Ave., Murray Hill, NJ 07974 USA, Email: gkr@bell-labs.com ; Gastpar, M.

Dependence balance bounds of Hekstra and Willems are generalized and refined. The new bounds are applied to the K-user multiaccess channel (MAC) with output feedback, and they are shown to establish the feedback sum-rate capacity for the Gaussian MAC when all users have the same per-symbol power constraints. The sum-rate capacity is achieved by Fourier modulated estimate correction. The feedback sum-rate capacity is shown to improve the no-feedback capacity by only log log K nats per use for large K. The new bounds also improve on cut-set bounds for asymmetric powers and rates.

Published in:

Information Theory Workshop, 2006. ITW '06 Punta del Este. IEEE

Date of Conference:

13-17 March 2006

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