Performance study of close-loop power control algorithms for a cellular CDMA system

Author

Sim, Moh Lim ; Gunawan, Erry ; Soong, Boon-Hee ; Soh, Cheong-Boon

Author_Institution

Fac. of Eng., Univ. Telekom-Multimedia, Melaka, Malaysia

Volume

48

Issue

3

fYear

1999

fDate

5/1/1999 12:00:00 AM

Firstpage

911

Lastpage

921

Abstract

Performance of a reverse link code-division multiple-access (CDMA) system with fast close-loop power control algorithms is studied. It is found that if the fast close-loop power control algorithm functions effectively, the speed of the mobile unit is in the range such that its Doppler frequency is less than one tenth of the power control updating rate. This paper also proposes a new predictive power control algorithm with better performance in terms of system capacity than the conventional and adaptive step size algorithms. An increase in system capacity as high as 22% compared with the conventional algorithm can be achieved depending on the mobile velocity

Keywords

Doppler effect; cellular radio; channel capacity; closed loop systems; code division multiple access; multiuser channels; power control; spread spectrum communication; telecommunication control; Doppler frequency; IS-95 DS-CDMA system; adaptive step size algorithms; cellular CDMA system; code-division multiple-access; fast close-loop power control algorithms; mobile unit; mobile velocity; performance; power control updating rate; predictive power control algorithm; reverse link; system capacity; Feedback; Multiaccess communication; Multiple access interference; Performance analysis; Power control; Power system modeling; Prediction algorithms; Programmable control; Shadow mapping; System performance;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/25.765019

Filename

765019