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UBC Theses and Dissertations
Performance of IEEE 802.11 MAC protocol over a wireless LAN with distributed radio bridges Chow, Cupid C.
Abstract
In this thesis, the performance, in terms of throughput and access delay, of the proposed distributed Wireless Local Area Network employing the IEEE 802.11 Medium Access Control protocol is analyzed extensively by computer simulations. The proposed network is based on using the same frequency for the entire coverage area with multiple receivers or radio bridges (RBs), with or without capture effect at each receiver. Different channel environments, including the Additive White Gaussian Noise (AWGN) channel, log-normal shadowing channel, Rayleigh fading channel, and log-normal shadowing plus Rayleigh fading channel, are considered in the simulations. The effects of various parameters are also studied. The results show that the performance can be improved significantly by using more RBs except for A W G N channel. The performance improvement of multiple RBs over one R B depends on the system parameters. In the log-normal shadowing plus Rayleigh fading channel, the throughput with 4 RBs and no capture can be improved by at least 120% over one RB. It is found that multiple RBs are more effective in a system with large number of stations and for channels severely degraded by shadowing or fading. With the use of capture, the performance can be improved by multiple RBs. But the performance improvement of multiple RBs is about the same as no capture cases. The effect of capture ratio is studied. It is found that the performance increases with decreasing the capture ratio. The performance of one and two dimensional models are found to be slightly different. The throughput does not change with packet size; however, the access delay degrades with packet size. Finally, it is found that the performance is not significantly affected by the length of the acknowledgment time-out.
Item Metadata
Title |
Performance of IEEE 802.11 MAC protocol over a wireless LAN with distributed radio bridges
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1999
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Description |
In this thesis, the performance, in terms of throughput and access delay, of the proposed
distributed Wireless Local Area Network employing the IEEE 802.11 Medium Access Control
protocol is analyzed extensively by computer simulations. The proposed network is based on
using the same frequency for the entire coverage area with multiple receivers or radio bridges
(RBs), with or without capture effect at each receiver. Different channel environments, including
the Additive White Gaussian Noise (AWGN) channel, log-normal shadowing channel, Rayleigh
fading channel, and log-normal shadowing plus Rayleigh fading channel, are considered in the
simulations. The effects of various parameters are also studied.
The results show that the performance can be improved significantly by using more RBs
except for A W G N channel. The performance improvement of multiple RBs over one R B depends
on the system parameters. In the log-normal shadowing plus Rayleigh fading channel, the
throughput with 4 RBs and no capture can be improved by at least 120% over one RB. It is found
that multiple RBs are more effective in a system with large number of stations and for channels
severely degraded by shadowing or fading. With the use of capture, the performance can be
improved by multiple RBs. But the performance improvement of multiple RBs is about the same
as no capture cases. The effect of capture ratio is studied. It is found that the performance
increases with decreasing the capture ratio.
The performance of one and two dimensional models are found to be slightly different.
The throughput does not change with packet size; however, the access delay degrades with packet
size. Finally, it is found that the performance is not significantly affected by the length of the
acknowledgment time-out.
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Extent |
5666775 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-06-12
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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 |
10.14288/1.0065166
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1999-05
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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.