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A multiantenna multiuser broadcast channel with transmitter beamforming anduser selection is considered. Different from the conventional works, weconsider imperfect channel state information (CSI) which is a practicalscenario for multiuser broadcast channels. We propose a robust regularizedzero-forcing (RRZF) beamforming at the base station. Then we show that the RRZFoutperforms zero-forcing (ZF) and regularized ZF (RZF) beamforming even as thenumber of users grows to infinity. Simulation results validate the advantage ofthe proposed robust RZF beamforming.

Regularized Zero-Forcing for Multiantenna Broadcast Channels with User Selection