Advances in Radio Science www.adv-radio-sci.net 1684-9965 1684-9973 1 Kleinheubacher Berichte 2002 2003 10.5194/ars-1-149-2003 http://www.adv-radio-sci.net/1/149/2003/ http://www.adv-radio-sci.net/1/149/2003/ars-1-149-2003.html http://www.adv-radio-sci.net/1/149/2003/ars-1-149-2003.pdf 149 153 2003-05-05 Downlink beamforming concepts in UTRA FDD M. Schacht A. Dekorsy P. Jung Lucent Technologies, Thurn-und-Taxis-Strasse 10, 90411 Nuremberg, Germany Gerhard-Mercator-Universität Duisburg, Oststrasse 99, 47057 Duisburg, Germany This article gives a comparison of beamforming concepts. Adaptive beamforming and fixed beam switching in WCDMA-FDD-mode are compared from a system level perspective, ordinary sectorization (three 120° sectors) serves as a basis for comparison. Pilot channels P-CPICH (Primary Common Pilot Channel) and S-CPICH (Secondary CPICH) are considered as additional interference. For adaptive beamforming channel estimation has to be based on the pilot bit sequence on DPCCH (Dedicated Physical Control Channel) which leads to degradation especially for high mobile velocities and large angular dispersions of the multipath channel.