We consider a downlink channel where a base station equipped with M transmit antennas communicates with K > M single-antenna receivers, and has partial channel knowledge obtained via a limited rate feedback channel. We propose a novel scalar feedback metric that incorporates information on the channel direction, the channel gain and the quantization error in order to exploit multiuser diversity. A low complexity scheme performing scheduling based on this metric and quantized channel directional information, and employing zero-forcing beamforming is proposed. We analyze its sum rate performance, and show its asymptotic sum rate optimality for large K.
Efficient metrics for scheduling in MIMO broadcast channels with limited feedback
ICASSP 2007, 32nd IEEE International Conference on Acoustics, Speech, and Signal Processing, April 15-20, 2007, Honolulu, USA
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