Gaussian Multiple-Access Channels with Cooperating Transmitters
Thurs., Oct 29, 2009
2:00 - 3:00 PM
400 Cory (Hughes room)
We study different additive white Gaussian multiple-access channels (MAC) with partially cooperating transmitters. In particular, we derive the capacity regions for the Gaussian versions of Willem's 2-user MAC with conferencing encoders and Slepian and Wolf's 3-user MAC with private and common messages. The derivations require a new technique for proving the optimality of Gaussian input distributions in certain mutual information maximizations under a single or multiple Markovity constraints. The technique can also be used to derive the capacity regions of the corresponding multi-antenna setups. We further consider a Costa-type extension of the Gaussian MAC with conferencing encoders. We show that as in Costa's setting the Gaussian interference can perfectly be canceled if it is non-causally known to both transmitters (but not the receiver). In the process of deriving this result we generalize Cohen and Lapidoth's single-user dirty-paper result for Gaussian interference and independent (not necessarily Gaussian) ergodic noise to dependent interference and noise.

Bio:
Michele Wigger received the M.Sc. degree (with distinction) and the Ph.D. degree both in electrical engineering from ETH Zurich in March 2003 and October 2008, respectively. Currently, she is a postdoctoral researcher at the Information Theory and Applications (ITA) center, University of California, San Diego. Starting in December 2009 she will be an assistant professor at Telecom Paris-Tech (former ENST), Paris, France. Her research interests are in the areas of information theory, wireless communication networks, cognitive networks, feedback communication, and optical communication.
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Kristen Woyach and Pulkit Grover Last Modification Date: Wednesday, August 19, 2009