Joint downlink beamforming and power control for 3G WCDMA

Author

Schubert, Martin ; Karadoulamas, Dimitrios ; Boche, Holger ; Lehmann, Gerald

Author_Institution

Fraunhofer Inst. Nachrichtentechnik, Heinrich-Hertz-Inst., Berlin, Germany

Volume

1

fYear

2003

Firstpage

331

Abstract

The spectral efficiency of the WCDMA downlink can significantly be increased by jointly adjusting beamformers and transmission powers. The design goal is to control individual link capacities with minimum total power. Channel information is assumed to be available at the base station. We propose a computational efficiency strategy which computes the beamforming weights by jointly balancing the instantaneous carrier-to-interference ratios (CINR) measured at each RAKE receiver input. Then, the SINRs at the RAKE output are adjusted by an additional power control step. Potential gains over conventional techniques are shown by numerical simulations.

Keywords

3G mobile communication; broadband networks; code division multiple access; power control; radio links; radio receivers; telecommunication channels; telecommunication control; 3G WCDMA; RAKE receiver; beamforming weights; carrier-to-interference ratios; computational efficiency; joint downlink beamforming; link capacities; power control; signal-to-interference noise ratio; transmission powers; wideband code division multiple access; Array signal processing; Base stations; Computational efficiency; Downlink; Fading; Multiaccess communication; Multipath channels; Numerical simulation; Power control; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual

ISSN

1090-3038

Print_ISBN

0-7803-7757-5

Type

conf

DOI

10.1109/VETECS.2003.1207557

Filename

1207557