The present invention relates to radio communication antennas and in particular relates to multi-user detection for CDMA antenna array receivers. Here is provided a method of operating a FDD radio communications system wherein a base station has a constrained beamformer comprising at least two antennas...http://www.google.es/patents/US6477161?utm_source=gb-gplus-sharePatente US6477161 - Downlink beamforming approach for frequency division duplex cellular systems
Downlink beamforming approach for frequency division duplex cellular systems
