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Adjacent channel interference in overlapping access points of OFDM WLANs Khan, Salman Aslam
Abstract
Interference analysis has always been a key issue for WLAN systems, because of the unregulated nature of the Industrial Scientific and Medical (ISM) bands that they operate in. However, an aspect of interference generally not considered is adjacent channel interference (ACI) from a neighboring WLAN operating on a standard defined non-overlapping channel. Because standard defined nonoverlapping channels are not truly non-overlapping but are based on limits set on the transmit signal spectrum, situations may arise where this interference will significantly degrade performance. With escalating deployment of WLANs in overlapping areas and the limited number of valid operating channels available, ACI may become a major hindrance to the optimal functioning of WLANs. In this work we present a detailed analysis of ACI that access points (APs) of OFDM WLANs deployed in overlaying coverage areas may experience when individual APs operate on IEEE 802.1 la defined non-overlapping channels. We investigate scenarios where ACI is most likely to occur. We also investigate the parameters that affect the severity of this interference and how system performance is degraded in the presence of ACI (in terms of physical layer parameters). We use these results to suggest minimum separation distances between APs that would render the effects of ACI negligible. Furthermore, several ACI mitigation techniques are described and their effectiveness for various scenarios is investigated. Results from our analysis may be used to improve network deployment strategies for large scale multi-AP WLANs and to develop routines that allow better coexistence strategies for APs deployed in overlapping coverage areas.
Item Metadata
Title |
Adjacent channel interference in overlapping access points of OFDM WLANs
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2006
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Description |
Interference analysis has always been a key issue for WLAN systems, because of the unregulated
nature of the Industrial Scientific and Medical (ISM) bands that they operate in. However, an aspect
of interference generally not considered is adjacent channel interference (ACI) from a neighboring
WLAN operating on a standard defined non-overlapping channel. Because standard defined nonoverlapping
channels are not truly non-overlapping but are based on limits set on the transmit signal
spectrum, situations may arise where this interference will significantly degrade performance. With
escalating deployment of WLANs in overlapping areas and the limited number of valid operating
channels available, ACI may become a major hindrance to the optimal functioning of WLANs.
In this work we present a detailed analysis of ACI that access points (APs) of OFDM WLANs
deployed in overlaying coverage areas may experience when individual APs operate on IEEE 802.1 la
defined non-overlapping channels. We investigate scenarios where ACI is most likely to occur. We
also investigate the parameters that affect the severity of this interference and how system
performance is degraded in the presence of ACI (in terms of physical layer parameters). We use these
results to suggest minimum separation distances between APs that would render the effects of ACI
negligible. Furthermore, several ACI mitigation techniques are described and their effectiveness for
various scenarios is investigated. Results from our analysis may be used to improve network
deployment strategies for large scale multi-AP WLANs and to develop routines that allow better coexistence
strategies for APs deployed in overlapping coverage areas.
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Genre | |
Type | |
Language |
eng
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Date Available |
2010-01-06
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0065421
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2006-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.