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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)In: Proceedings of the 2000 IEEE Global Telecommunications Conference, IEEE , 2000, Vol. 3, 1504-1508 p.Conference paper, Published paper (Refereed)
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
IEEE , 2000. Vol. 3, 1504-1508 p.
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-91211DOI: 10.1109/GLOCOM.2000.891891ISBN: 0-7803-6451-1 (print)OAI: oai:DiVA.org:liu-91211DiVA: diva2:616622
Conference
2000 IEEE Global Telecommunications Conference, San Francisco, CA, USA, 27 November - 1 December 2000
Available from: 2013-04-17 Created: 2013-04-17 Last updated: 2015-03-26

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Gunnarsson, FredrikGustafsson, 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
  • rtf