The Optimality of Transmit Beamforming: A Unified View
Srinivasa, S.; Jafar, S.A.
Information Theory, IEEE Transactions on
Volume 53, Issue 4, April 2007 Page(s):1558 - 1564
Digital Object Identifier   10.1109/TIT.2007.892769
Summary:The optimality of transmit beamforming for a multiple antenna system with partial/limited feedback is investigated and a single general necessary and sufficient condition for beamforming to achieve ergodic capacity is derived. The condition obtained is universal - applicable to all partial/limited feedback scenarios in all ergodic fading channel distributions regardless of the number of transmit/receive antennas or transmit power. Using the universal condition we explore the optimality of beamforming for the quantized mean feedback scheme, which unifies previous results for the separate cases of mean feedback and quantized feedback. Numerical results are provided to complement the analysis

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