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Time Delay Compensation for CDMA Power Control
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.
2000 (English)Report (Other academic)
Abstract [en]

Transmission power control is essential in CDMA systems in order to reduce the near-far effect and to optimize the bandwidth utilization, which is critical when variable data rates are used. One remaining problem is oscillations in the output powers due to round-trip delays in the power control loops together with the power up-down command device. The oscillations are naturally quantified using discrete-time describing functions, which are introduced and applied. More importantly, Time Delay Compensation (TDC) is proposed to mitigate the oscillations. It is also formally proven that TDC result in a stable overall system, with power control errors that converges to a defined bounded region. These bounds are tighter, compared to when not employing TDC. Simulations illustrate the oscillations and the significant performance gains using TDC.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2000. , 5 p.
Series
LiTH-ISY-R, ISSN 1400-3902 ; 2287
Keyword [en]
Power control, Cellular radio systems, Time delays, Time delay compensation, Discrete-time describing functions, Convergence
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-55742ISRN: LiTH-ISY-R-2287OAI: oai:DiVA.org:liu-55742DiVA: diva2:316590
Available from: 2010-04-30 Created: 2010-04-30 Last updated: 2014-08-15Bibliographically approved

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Gunnarsson, FredrikGustafsson, Fredrik

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf