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This paper studies efficient signal transmission strategies in a multiuser MIMO network where multiple source nodes form a large virtual MIMO array to perform cooperative beamforming. In order to reduce instantaneous feedback needs, the authors investigate joint power control and cooperative beamforming techniques to maximize the minimum weighted average SINR based on statistical channel information, which consists of the covariance matrices in the beamforming network. Since the joint optimization problem over power, transmit beamformer and receive beamformer is non-convex, they analyze two sub-problems: the joint optimization of power and transmit beamformer under fixed receive beamformer, and the joint optimization of power and receive beamformer under fixed transmit beamformer.
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