A channel oriented Joint Transmission scheme for MIMO multi-user downlinks

The paper deals with the downlink of mobile radio systems, where in each cell an access point communicates with a number of mobile terminals, and where both the access point and the mobile terminals are equipped with multi-antennas. Therefore, the entirety of all downlink connections of each cell constitute a multi-user MIMO system. The considered downlink transmission technique is the recently proposed concept Joint Transmission (JT), which means that the receiver algorithms employed at the mobile terminals are a priori determined, whereas the transmitter algorithms utilized at the access point are a posteriori adapted under consideration of channel state information. This receiver oriented rationale allows the beneficial exploitation of channel state information at the access point. An important aspect in these considerations is the advantageous choice of the demodulators to be applied at the mobile terminals under consideration of channel state information. That is, exploiting channel state information at both the transmitter and the receiver leads to a channel oriented transmission scheme.