The Gaussian MAC with Conferencing Encoders

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.

5 pages, To be presented at ISIT 2008 in Toronto

Cited by in corpus (10)

• Compound Multiple Access Channels with Partial Cooperation
• Multiaccess Channel with Partially Cooperating Encoders and Security Constraints
• The Arbitrarily Varying Multiple-Access Channel with Conferencing Encoders
• Interference Mitigation Through Limited Receiver Cooperation
• Multiple Multicasts with the Help of a Relay
• Message and state cooperation in multiple access channels
• Distributed Interference Cancellation in Multiple Access Channel with Transmitter Cooperation
• On the Gaussian MAC with Imperfect Feedback
• Interference Mitigation Through Limited Receiver Cooperation: Symmetric Case
• The Gaussian Multiple Access Diamond Channel