Abstract: With the trend that CDMA will be the dominant multi-access scheme in the new generation of wireless communication,how to apply spatial processing in CDMA system has been becoming the emphasis of research in smart antenna.A proper method is space-time processing due to the space-time structure of wireless channel.Beamforming can be combined with RAKE to form 2D RAKE receiver,which can effectively weaken the enhancement of MAI in conventional RAKE receiver.However a more effective method is to use space-time filtering.These two scheme will be discussed and the structure and realization will be presented.

Key words: smart antenna, CDMA, space-time processing