Title :
Adaptive beamforming and power control for DS-CDMA mobile radio communications
Author :
Liang, Ying-Chang ; Chin, Francois P S ; Kot, Alex C.
Author_Institution :
Centre for Wireless Commun., Singapore
Abstract :
Joint beamforming and power control is an efficient technique to increase the capacity of DS-CDMA systems. It is shown that the optimal solution of the uplink beamforming weights is independent of the combined path loss/shadowing effect. Based on this, a novel approach is proposed to implement adaptive beamforming and power control by converting the joint problem into a simple power control problem. It generates the optimal beamforming weights in each slot based on estimated channel responses. Computer simulations show that the new approach has much faster convergence for transmission power than the traditional LMS algorithm
Keywords :
adaptive control; array signal processing; code division multiple access; land mobile radio; linear antenna arrays; multiuser channels; optimisation; power control; radio links; spread spectrum communication; telecommunication control; BER; DS-CDMA mobile radio communications; adaptive beamforming; adaptive power control; computer simulations; estimated channel response; optimal beamforming weights; optimal solution; path loss/shadowing effect; uniform linear array; uplink beamforming weights; Adaptive control; Array signal processing; Computer simulation; Convergence; Land mobile radio; Least squares approximation; Multiaccess communication; Power control; Programmable control; Shadow mapping;
Conference_Titel :
Communications, 2001. ICC 2001. IEEE International Conference on
Conference_Location :
Helsinki
Print_ISBN :
0-7803-7097-1
DOI :
10.1109/ICC.2001.937159
