Title :
MMSE Criteria for Downlink Beamforming in CDMA Wireless Systems
Author :
Wrycza, Peter ; Bengtsson, Mats ; Ottersten, Björn
Author_Institution :
Signal Process., R. Inst. of Technol., Stockholm
Abstract :
In wireless systems with multiple antennas at the access points, the downlink power has to be spatially optimized to allow several simultaneous users. We consider two different MMSE criteria for a multi-user downlink CDMA system and determine the optimal transmit beamforming weights. The MMSE criteria with and without receiver gain control are compared for a system where the transmitter is equipped with an antenna array and the receivers have single antennas. The MMSE and SINR versus different number of users is shown and the effect of including the gain control in the MMSE criteria is clearly demonstrated
Keywords :
antenna arrays; code division multiple access; least mean squares methods; radio links; radio receivers; radio transmitters; radiofrequency interference; CDMA wireless systems; MMSE criteria; SINR; antenna array; code division multiple access; downlink beamforming; minimum mean square error; multi-user downlink CDMA system; multiple antennas; signal-to-interference plus noise ratio; single antennas; transmit beamforming weights; Antenna arrays; Array signal processing; Downlink; Gain control; Multiaccess communication; Quality of service; Receiving antennas; Signal to noise ratio; Transmitters; Transmitting antennas;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on
Conference_Location :
Toulouse
Print_ISBN :
1-4244-0469-X
DOI :
10.1109/ICASSP.2006.1661093
