Outage probability analysis of downlink power allocation mechanisms in CDMA systems during soft handoff

Li-Chun Wang*, Lei Chen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


This paper presents an analytical approach to evaluate the downlink outage probability for a handoff user in code division multiple access (CDMA) systems under the lognormally shadowed and Rician fading channel subject to cochannel interference. Since soft handoff performance is related to the power allocation algorithms, we consider various downlink power allocation schemes, including the site selection diversity transmission (SSDT), the link proportional power allocation (LPPA), the equal power allocation (EPA), and the quality balancing power allocation (QBPA). From our analytical model, it is shown that SSDT is most sensitive to fast fading and co-channel interference. By contrast, LPPA can achieve better outage in the presence of fast fading at the cost of slightly sacrificing power efficiency. The proposed analytical framework can be applied to evaluate the effects of handoff thresholds, orthogonality factors of channelization codes, and Rician factors on the outage performance of soft handoff users subject to cochannel interference from other cells.

Original languageEnglish
Title of host publicationVTC 2005-Fall
Subtitle of host publicationMid Way Through the Decade - Technology Past, Present and Future
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)0780391527
StatePublished - 28 Sep 2005
Event62nd Vehicular Technology Conference, VTC 2005 - Dallas, United States
Duration: 25 Sep 200528 Sep 2005

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252


Conference62nd Vehicular Technology Conference, VTC 2005
CountryUnited States


  • CDMA
  • Co-channel interference
  • Link proportional power allocation (LPPA)
  • Outage probability
  • Rician fading
  • Site selection diversity transmission (SSDT)
  • Soft handoff

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