Hongmei Wang Xibin Xu Ming Zhao 0001 Weiling Wu Yan Yao Efficient Transmission Schemes for Multiuser MIMO-OFDM Downlink Systems in Time-Varying Channels. 812-816 2008 VTC Spring http://dx.doi.org/10.1109/VETECS.2008.177 conf/vtc/2008s db/conf/vtc/vtc2008s.html#WangXZWY08