Imperfect channel knowledge: An insurmountable barrier in Rx oriented multi-user MIMO transmission ?

In conventional transmission schemes the transmitter algorithms are a priori given, whereas the algorithms to be used by the receivers have to be a posteriori adapted. Such schemes can be termed transmitter (Tx) oriented. The opposite to Tx orientation would be receiver (Rx) orientation, in which the receiver algorithms are a priori given, and the transmitter algorithms have to be a posteriori adapted under consideration of channel knowledge. A question still open concerns the impact of imperfect channel knowledge on the transmission quality of Rx oriented data transmission, especially if radio transmission systems with multi-antennas both at the transmitter and receiver are considered. In the paper this question is analytically studied. To that purpose closed form expressions for signal-to-noise-plus-interference-ratios and bit error probabilities are derived which show a good match to simulation results.