An adaptive scheme was introduced in view of optimizing the overall spectral efficiency of a multiuser MIMO wireless broadcast channel where the channel state information at the transmitting base station (CSIT), to be used for user scheduling and beamforming, is acquired over a limited-rate feedback channel. In this scheme, the feedback rate is no longer constant per scheduling period but rather optimized as a function of the time-dependent channel quality seen at the user side. The present paper further refines this idea and elaborates on some of the associated practical concerns.
Adaptive feedback rate control in MIMO broadcast systems with user scheduling
ITA 2008 Information Theory and Applications Workshop, January 28-30 2008, San Diego, USA
Invited paper in a conference
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