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Uplink Load and Link Budget with Stochastic Noise Rise Levels in CDMA Cellular Systems
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.
2004 (English)Report (Other academic)
Abstract [en]

The limiting factor in the uplink of all CDMA cellular systems is the relation between uplink noise rise and intended coverage. In link budgets, noise rise is usually simply handled as a constant contribution to the background noise in logarithmic scale, often referred to as interference margin. In practice, however, it is not constant. We model the uplink noise rise as a lognormal distribution, and investigate the impact to link budgets. Simulations and numerical calculations show that the uplink noise rise variance does not critically affect the uplink capacity and coverage. System feasibility and its relation to the uplink load is also discussed. It is shown that approximative load expressions provides an upper bound on the uplink load and therefore they can be used to imply system feasibility. Furthermore, the uplink load expressions provide accurate approximations of the load given that the load is within the practical limits given by the link budgets.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2004. , 8 p.
Series
LiTH-ISY-R, ISSN 1400-3902 ; 2609
Keyword [en]
Link budget, Noise rise variance, Maximum noise rise, System load
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-55988ISRN: LiTH-ISY-R-2609OAI: oai:DiVA.org:liu-55988DiVA: diva2:316747
Available from: 2010-04-30 Created: 2010-04-30 Last updated: 2014-08-13Bibliographically approved

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Gustafsson, FredrikGeijer Lundin, ErikGunnarsson, Fredrik

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CiteExportLink to record
Permanent link

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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
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  • asciidoc
  • rtf