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Power Control in Cellular Systems Subject to Constraints and Time Delays
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, The Institute of Technology.
1998 (English)In: Proceedings of the 1998 IEEE Global Telecommunications Conference, 1998, 3645-3650 vol.6 p.Conference paper, Published paper (Refereed)
Abstract [en]

Stability is a fundamental property desirable for any controlled system. We briefly review the root locus and describing function techniques, which are tools for stability analysis, and show how they can be applied to power control algorithms in cellular radio networks. The root locus method is used to find stability limits on controller parameters, and describing functions for predicting the presence of oscillations in the system. Thus these methods can be used to support the design phase, when deciding upon the appropriate controller parameters. These tools are demonstrated for various control algorithms and when different smoothing filters are applied. The analysis reveals that the distributed power control (DPC) algorithm, which works fine under ideal circumstances, yields an unstable system when subject to a small time delay. Furthermore, it is concluded that the performance with respect to stability is better when the measurements are averaged by an exponential forgetting filter than by the moving average filter.

Place, publisher, year, edition, pages
1998. 3645-3650 vol.6 p.
Keyword [en]
Cellular radio systems, Power control, Local loop analysis, Time delays, Root locus, Describing functions
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-91599DOI: 10.1109/GLOCOM.1998.775990ISBN: 0-7803-4984-9 (print)OAI: oai:DiVA.org:liu-91599DiVA: diva2:625250
Conference
1998 IEEE Global Telecommunications Conference, Sydney, Australia, November, 1998
Available from: 2013-06-04 Created: 2013-04-28 Last updated: 2013-06-04

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Gustafsson, FredrikGunnarsson, Fredrik

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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