Compound multiple-access channels with partial cooperation

Authors:
Osvaldo Simeone;Deniz Gündüz;H. Vincent Poor;Andrea J. Goldsmith;Shlomo Shamai
Affiliations:
CWCSPR, New Jersey Institute of Technology, Newark, NJ;Department of Electrical Engineering, Princeton University, Princeton, NJ and Department of Electrical Engineering, Stanford University, Stanford, CA;Department of Electrical Engineering, Princeton University, Princeton, NJ;Department of Electrical Engineering, Stanford University, Stanford, CA;Department of Electrical Engineering, Technion-Israel Institute of Technology, Technion City, Haifa, Israel
Venue:
IEEE Transactions on Information Theory
Year:
2009

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Abstract

A two-user discrete memoryless compound multiple-access channel (MAC) with a common message and conferencing decoders is considered. The capacity region is characterized in the special cases of physically degraded channels and unidirectional cooperation, and achievable rate regions are provided for the general case. The results are then extended to the corresponding Gaussian model. In the Gaussian setup, the provided achievable rates are shown to lie within some constant number of bits from the boundary of the capacity region in several special cases. An alternative model, in which the encoders are connected by conferencing links rather than having a common message, is studied as well, and the capacity region for this model is also determined for the cases of physically degraded channels and unidirectional cooperation. Numerical results are also provided to obtain insights about the potential gains of conferencing at the decoders and encoders.