Title :
An adjustable fuzzy power control architecture for a multi-rate WCDMA system
Author :
Jiunming, Wu ; Chunchyuan, Chen
Author_Institution :
Dept. of Electr. Eng., Nat. Dong Hwa Univ., Hualien
Abstract :
This paper describes an adjustable fuzzy power control architecture for a multi-rate WCDMA system. The adjustable fuzzy power control architecture is employed to adaptively control the transmission power and select the suitable transmission rate in the uplink transmission. Unlike the conventional power control mechanisms, the proposed power control architecture can dynamically adjust the membership function of the fuzzy system by the input signal-to-interference (SIR) error and the error change. The adjustment of the membership function can improve the system performance in a time-varying fading channel. In addition, the conventional Lagrangian relaxation method and the fuzzy power control architecture with fixed membership function were evaluated by computer simulations. According to the simulation results, the adjustable fuzzy power control architecture achieves a smaller outage probability and has a higher average transmission rate than those of the prior power control architectures in a wireless fading channel.
Keywords :
adaptive control; code division multiple access; fading channels; fuzzy control; power control; telecommunication control; time-varying channels; Lagrangian relaxation; adaptive control; adjustable fuzzy power control architecture; error change; fuzzy system; input signal-to-interference error; membership function; multirate WCDMA system; time-varying fading channel; transmission power; transmission rate; uplink transmission; Computer architecture; Computer errors; Error correction; Fading; Fuzzy control; Fuzzy systems; Multiaccess communication; Power control; System performance; Time varying systems; Fuzzy control theory; Power control; WCDMA;
Conference_Titel :
Control Conference, 2008. CCC 2008. 27th Chinese
Conference_Location :
Kunming
Print_ISBN :
978-7-900719-70-6
Electronic_ISBN :
978-7-900719-70-6
DOI :
10.1109/CHICC.2008.4605817