NDLI: Two-mode fast power control for WCDMA systems

Content Provider	IEEE Xplore Digital Library
Author	Rintamaki, M. Virtej, I. Koivo, H.
Copyright Year	2001
Description	Author affiliation: Signal Process. Lab., Helsinki Univ. of Technol., Finland (Rintamaki, M.)
Abstract	Power control is needed in WCDMA systems to mitigate a so-called near-far effect, which is caused by the large variations of signal strength due to the Rayleigh fading radio propagation channel. This paper proposes an improved fast power control scheme for WCDMA systems, suitable for real implementation. Realistic constraints for the power control command length and step size are taken into account. The scheme consists of an adaptive generalized minimum-variance self-tuning controller and a simple bang-bang controller, which is used as a backup for the adaptive controller. The adaptive controller takes advantage of both the current and previous signal-to-interference ratio (SIR) measurements and power control commands. The proposed algorithm (called STGMV-PC for self-tuning generalized minimum-variance power control) is used in the uplink, while only a bang-bang controller is used in the downlink. Computer simulations indicated that better performance can be achieved with the proposed algorithm in comparison with either bang-bang or pure minimum variance controller.
Starting Page	2893
Ending Page	2897
File Size	444959
Page Count	5
File Format	PDF
ISBN	0780367286
ISSN	10903038
DOI	10.1109/VETECS.2001.944130
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-05-06
Publisher Place	Greece
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power control Multiaccess communication Programmable control Adaptive control Rayleigh channels Radio propagation Current measurement Power measurement Downlink Computer simulation
Content Type	Text
Resource Type	Article

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