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In this paper, the authors study adaptive transmission mode switching between statistical and instantaneous Channel State Information (CSI) aided Single-User (SU) and Multi-User (MU) pre-coding for a two-user downlink system, where two transmit antennas are equipped at the base station and each mobile user has one receive antenna. In the case where only Statistical CSI (SCSI) is available at the transmitter, a Statistical-Eigen mode Space-Division Multiple-Access (SE-SDMA) scheme is proposed by maximizing a lower bound of the ergodic signal-to-leakage-and-noise ratio.
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