Robust Linear Processing for Downlink Multiuser MIMO System With   Imperfectly Known Channel
  This paper proposes a roust downlink multiuser MIMO scheme that exploits the channel mean and antenna correlations to alleviate the performance penalty due to the mismatch between the true and estimated CSI. 
Pengfei Ma (1), Xiaochuan Zhao (1), Mugen Peng (1), Wenbo Wang (1)   ((1) Beijing University of Posts and Telecommunications...