Macrocell-Wide Behavior of the Orthogonality Factor in WCDMA Downlinks
(2006) In IEEE Transactions on Wireless Communications 5(12). p.3394-3399- Abstract
- The orthogonality factor (OF) quantifies the loss of orthogonality between the signals transmitted simultaneously on a wideband code division multiple access (WCDMA) downlink due to multipath dispersion. It is one of the fundamental parameters that determines the signal-to-interference-plus-noise ratio at the output of the Rake receiver and, consequently, it has a significant impact on downlink system capacity. The OF depends greatly on the delay profile of the multipath channel between the mobile and its serving base station; this profile varies considerably from one location in the cell to another. In this paper, we study how the statistical properties of the small-scale-fading-averaged OF vary over the entire macrocellular area. We use... (More)
- The orthogonality factor (OF) quantifies the loss of orthogonality between the signals transmitted simultaneously on a wideband code division multiple access (WCDMA) downlink due to multipath dispersion. It is one of the fundamental parameters that determines the signal-to-interference-plus-noise ratio at the output of the Rake receiver and, consequently, it has a significant impact on downlink system capacity. The OF depends greatly on the delay profile of the multipath channel between the mobile and its serving base station; this profile varies considerably from one location in the cell to another. In this paper, we study how the statistical properties of the small-scale-fading-averaged OF vary over the entire macrocellular area. We use an ensemble of channel profiles at different locations in a cell generated from an implementation of the comprehensive COST259 channel model, which incorporates results from several experimental investigations. We show that the small-scale-fading-averaged OF is itself a random variable whose statistics depend on the mobile's distance from its serving base station. The large observed variance 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. Finally, we propose a simple model that closely matches the statistics of the OF as a function of mobile-to-base distance, thus obviating the need to set up the complicated channel model every time OF values are to be generated. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/601061
- author
- Mehta, N B ; Molisch, Andreas LU and Greenstein, L
- organization
- publishing date
- 2006
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- wideband code division multiple access, land mobile, fading channels, multipath channels, radio propagation factors, Rayleigh channels, Rake receivers, cellular radio, COST259, channel profile, time-varying channels, statistics, radio receivers, orthogonality factor
- in
- IEEE Transactions on Wireless Communications
- volume
- 5
- issue
- 12
- pages
- 3394 - 3399
- publisher
- IEEE - Institute of Electrical and Electronics Engineers Inc.
- external identifiers
-
- wos:000242982400013
- scopus:33845653515
- ISSN
- 1536-1276
- DOI
- 10.1109/TWC.2006.256962
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Department of Electroscience (011041000)
- id
- e975779f-7b35-462f-8c5e-a10178011850 (old id 601061)
- date added to LUP
- 2016-04-01 15:32:15
- date last changed
- 2022-01-28 05:49:06
@article{e975779f-7b35-462f-8c5e-a10178011850,
abstract = {{The orthogonality factor (OF) quantifies the loss of orthogonality between the signals transmitted simultaneously on a wideband code division multiple access (WCDMA) downlink due to multipath dispersion. It is one of the fundamental parameters that determines the signal-to-interference-plus-noise ratio at the output of the Rake receiver and, consequently, it has a significant impact on downlink system capacity. The OF depends greatly on the delay profile of the multipath channel between the mobile and its serving base station; this profile varies considerably from one location in the cell to another. In this paper, we study how the statistical properties of the small-scale-fading-averaged OF vary over the entire macrocellular area. We use an ensemble of channel profiles at different locations in a cell generated from an implementation of the comprehensive COST259 channel model, which incorporates results from several experimental investigations. We show that the small-scale-fading-averaged OF is itself a random variable whose statistics depend on the mobile's distance from its serving base station. The large observed variance 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. Finally, we propose a simple model that closely matches the statistics of the OF as a function of mobile-to-base distance, thus obviating the need to set up the complicated channel model every time OF values are to be generated.}},
author = {{Mehta, N B and Molisch, Andreas and Greenstein, L}},
issn = {{1536-1276}},
keywords = {{wideband code division multiple access; land mobile; fading channels; multipath channels; radio propagation factors; Rayleigh channels; Rake receivers; cellular radio; COST259; channel profile; time-varying channels; statistics; radio receivers; orthogonality factor}},
language = {{eng}},
number = {{12}},
pages = {{3394--3399}},
publisher = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
series = {{IEEE Transactions on Wireless Communications}},
title = {{Macrocell-Wide Behavior of the Orthogonality Factor in WCDMA Downlinks}},
url = {{http://dx.doi.org/10.1109/TWC.2006.256962}},
doi = {{10.1109/TWC.2006.256962}},
volume = {{5}},
year = {{2006}},
}