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We consider a MIMO broadcast channel where the channel state information at the transmitter (CSIT), to be used for user scheduling and beamforming, is gained through a limited-rate feedback channel. In view of optimizing the overall spectral efficiency of the system, we propose an adaptive scheme in which the feedback rate is no longer constant but rather optimized as a function of the time-dependent channel quality seen at the user side. One key idea is that, under an average feedback ratedoi:10.1109/itw.2008.4578703 dblp:conf/itw/ZakhourG08 fatcat:yilz3b3525hixfah3r3emwlbji