On the capacity of the vector MAC with feedback
Jafar, S.; Goldsmith, A.
Information Theory, IEEE Transactions on
Volume 52, Issue 7, July 2006 Page(s): 3259 - 3264
Digital Object Identifier   10.1109/TIT.2006.876230
Summary: In this correspondence, we determine the feedback capacity region of a two user Gaussian multiple-access channel (MAC) with multiple antennas at the base station and a single antenna at each user. The vector MAC with a single antenna at the base station and multiple antennas at each user is shown to be equivalent to a scalar MAC. We also determine the capacity enhancement due to feedback at high signal-to-noise ratio (SNR) for the scalar and vector MAC for any number of users. Extensions of the high SNR results to the vector broadcast channel are also provided.

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