Orthogonality Factor in WCDMA Downlinks in Urban Macrocelluar Environments

N Mehta, Andreas Molisch, L Greenstein

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review


Multipath dispersion leads to the loss of orthogonality between signals transmitted simultaneously on a wide-band code division multiple access (WCDMA) downlink. The orthogonality factor (OF), which models its impact in the link signal-to-interference-plus-noise ratio (SINR) equation, depends - to a large extent - on the power delay profile of the multipath channel between the mobile and its serving base station. We use the comprehensive and general COST259 channel model for urban cellular environments to evaluate the impact on the OF of multipath clusters and distance-dependence of the multipath delay decay time constant, both of which have been observed in several channel measurements. The observed large standard deviation of the OF indicates that using a single value for all users in downlink capacity analyses and simulations, as has been the practice, may lead to erroneous conclusions. We also propose an empirical model to analytically characterize the observed statistics of the OF.
Original languageEnglish
Title of host publicationIEEE Global Telecommunications Conference, GLOBECOM '05.
Number of pages5
Publication statusPublished - 2005
EventIEEE Global Communications Conference (GLOBECOM), 2005 - St. Louis, MO, United States
Duration: 2005 Nov 112005 Dec 2


ConferenceIEEE Global Communications Conference (GLOBECOM), 2005
Country/TerritoryUnited States
CitySt. Louis, MO

Subject classification (UKÄ)

  • Electrical Engineering, Electronic Engineering, Information Engineering


  • broadband networks
  • cellular radio
  • channel capacity
  • code division multiple access
  • multipath channels
  • radio links


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