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

Volume

5

fYear

2001

fDate

2001

Firstpage

1441

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 2001. ICC 2001. IEEE International Conference on

Conference_Location

Helsinki

Print_ISBN

0-7803-7097-1

Type

conf

DOI

10.1109/ICC.2001.937159

Filename

937159