Title :
FDD DS-CDMA downlink beamforming by modifying uplink beamforming weights
Author :
Liang, Ying-Chang ; Chin, Fiancois P S
Author_Institution :
Centre for Wireless Commun., Singapore
Abstract :
Two new suboptimal algorithms are proposed for downlink beamforming in FDD DS-CDMA mobile radio by using uplink beamforming weights. One is the null constraint (NC) method, which constrains the same null positions for both the uplink and downlink. The other is the frequency calibration (FC) method, which constrains the same main beam positions for both links. Even though the new algorithms are simple, they may provide a larger capacity enhancement as compared with the DOA methods which just direct the main beam toward the desired user
Keywords :
array signal processing; calibration; code division multiple access; direction-of-arrival estimation; land mobile radio; linear antenna arrays; multiuser channels; radio links; spread spectrum communication; DOA method; FC-MMSE; FDD DS-CDMA downlink beamforming; NC-MMSE; RAKE receivers; base station antenna array; capacity enhancement; frequency calibration method; mobile radio; null constraint method; signal detection; suboptimal algorithms; uniform linear array; uplink beamforming weights modification; 3G mobile communication; Array signal processing; Base stations; Calibration; Downlink; Multiaccess communication; Power control; Signal detection; Wideband; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2000. IEEE-VTS Fall VTC 2000. 52nd
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-6507-0
DOI :
10.1109/VETECF.2000.886649
