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CORR
2008
Springer

Dependence Balance Based Outer Bounds for Gaussian Networks with Cooperation and Feedback

8 years 10 months ago
Dependence Balance Based Outer Bounds for Gaussian Networks with Cooperation and Feedback
We obtain new outer bounds on the capacity regions of the two-user multiple access channel with generalized feedback (MAC-GF) and the two-user interference channel with generalized feedback (IC-GF). These outer bounds are based on the idea of dependence balance which was proposed by Hekstra and Willems [1]. To illustrate the usefulness of our outer bounds, we investigate three different channel models. We first consider a Gaussian MAC with noisy feedback (MAC-NF), where transmitter k, k = 1, 2, receives a feedback YFk , which is the channel output Y corrupted with additive white Gaussian noise Zk. As the feedback noise variances 2 Zk , k = 1, 2, become large, one would expect the feedback to become useless. This fact is not reflected by the cut-set outer bound. We demonstrate that our outer bound improves upon the cut-set bound for all non-zero values of the feedback noise variances. Moreover, in the limit as 2 Zk , k = 1, 2, our outer bound collapses to the capacity region of the Gau...
Ravi Tandon, Sennur Ulukus
Added 10 Dec 2010
Updated 10 Dec 2010
Type Journal
Year 2008
Where CORR
Authors Ravi Tandon, Sennur Ulukus
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