A hardware testbed for measuring IEEE 802.11g DCF performance

 

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dc.contributor.advisor Kritzinger, Pieter S en_ZA
dc.contributor.author Symington, Andrew en_ZA
dc.date.accessioned 2014-11-05T17:42:22Z
dc.date.available 2014-11-05T17:42:22Z
dc.date.issued 2009 en_ZA
dc.identifier.citation Symington, A. 2009. A hardware testbed for measuring IEEE 802.11g DCF performance. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/9282
dc.description Includes bibliographical references (leaves 80-84). en_ZA
dc.description.abstract The Distributed Coordination Function (DCF) is the oldest and most widely-used IEEE 802.11 contention-based channel access control protocol. DCF adds a significant amount of overhead in the form of preambles, frame headers, randomised binary exponential back-off and inter-frame spaces. Having accurate and verified performance models for DCF is thus integral to understanding the performance of IEEE 802.11 as a whole. In this document DCF performance is measured subject to two different workload models using an IEEE 802.11g test bed. Bianchi proposed the first accurate analytic model for measuring the performance of DCF. The model calculates normalised aggregate throughput as a function of the number of stations contending for channel access. The model also makes a number of assumptions about the system, including saturation conditions (all stations have a fixed-length packet to send at all times), full-connectivity between stations, constant collision probability and perfect channel conditions. Many authors have extended Bianchi's machine model to correct certain inconsistencies with the standard, while very few have considered alternative workload models. Owing to the complexities associated with prototyping, most models are verified against simulations and not experimentally using a test bed. In addition to a saturation model we considered a more realistic workload model representing wireless Internet traffic. Producing a stochastic model for such a workload was a challenging task, as usage patterns change significantly between users and over time. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Computer Science en_ZA
dc.title A hardware testbed for measuring IEEE 802.11g DCF performance en_ZA
dc.type Thesis / Dissertation en_ZA
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Computer Science en_ZA
dc.type.qualificationlevel Masters en_ZA
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image


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