Title :
Enhanced fast power control for WCDMA systems
Author :
Virtej, Iuliana ; Rintamäki, Matti ; Koivo, Heikki
Author_Institution :
Control Eng. Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
The continuous increase of cellular phones shapes up the appearance of new communication systems and new technologies. In real life the radio signals are subjected to Rayleigh fading (fast fading) and interference. These result in large variations in signal strength. Power control (PC) is needed to compensate for these effects. Power control is one of the critical radio resource control functions in a WCDMA-based system. This paper describes a contribution of applying an adaptive (self-tuning) controller in the fast power control loop of WCDMA systems. Replacing the conventional controller with a controller that decides the PC command based on the history of the PC commands and errors improves the quality of the transmission significantly
Keywords :
Rayleigh channels; adaptive control; broadband networks; cellular radio; code division multiple access; multiuser channels; power control; radio networks; radiofrequency interference; spread spectrum communication; telecommunication control; Rayleigh fading; WCDMA systems; adaptive controller; cellular phones; fast fading; fast power control; interference; radio resource control; radio signals; self-tuning controller; signal strength variations; transmission quality; Cellular phones; Communication system control; Control systems; Interference; Multiaccess communication; Power control; Programmable control; Radio control; Rayleigh channels; Shape;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-6463-5
DOI :
10.1109/PIMRC.2000.881655
