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Orthogonality Factor in WCDMA Downlinks in Urban Macrocelluar Environments

Mehta, N; Molisch, Andreas LU and Greenstein, L (2005) IEEE Global Communications Conference (GLOBECOM), 2005 In IEEE Global Telecommunications Conference, GLOBECOM '05.
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
broadband networks, cellular radio, channel capacity, code division multiple access, multipath channels, radio links
in
IEEE Global Telecommunications Conference, GLOBECOM '05.
pages
5 pages
conference name
IEEE Global Communications Conference (GLOBECOM), 2005
external identifiers
  • Scopus:33846592405
ISBN
0-7803-9414-3
DOI
10.1109/GLOCOM.2005.1578400
language
English
LU publication?
yes
id
870a5603-6c39-4e94-8cbd-31957c8901ad (old id 600832)
date added to LUP
2007-12-06 13:45:43
date last changed
2016-10-13 04:51:36
@misc{870a5603-6c39-4e94-8cbd-31957c8901ad,
  abstract     = {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.},
  author       = {Mehta, N and Molisch, Andreas and Greenstein, L},
  isbn         = {0-7803-9414-3},
  keyword      = {broadband networks,cellular radio,channel capacity,code division multiple access,multipath channels,radio links},
  language     = {eng},
  pages        = {5},
  series       = {IEEE Global Telecommunications Conference, GLOBECOM '05.},
  title        = {Orthogonality Factor in WCDMA Downlinks in Urban Macrocelluar Environments},
  url          = {http://dx.doi.org/10.1109/GLOCOM.2005.1578400},
  year         = {2005},
}