Hyeong-Sook Park Youn-Ok Park Cheol-Sung Kim Design and Implementation of Efficient Beamforming Transmitter in OFDMA/TDD System. 1-5 2006 conf/vtc/2006f VTC Fall https://doi.org/10.1109/VTCF.2006.134 db/conf/vtc/vtc2006f.html#ParkPK06