Performance of static and adpative subchannel allocation schemes for fractional frequency reuse in WiMAX networks

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buir.advisorKaraşan, Ezhan
dc.contributor.authorKar, Görkem
dc.date.accessioned2016-01-08T18:15:45Z
dc.date.available2016-01-08T18:15:45Z
dc.date.issued2011
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.descriptionAnkara : The Department of Electrical and Electronics Engineering and the Institute of Engineering and Sciences of Bilkent Uniersity, 2011.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2011.en_US
dc.descriptionIncludes bibliographical references leaves 48-50.en_US
dc.description.abstractWe study the downlink performance of WiMAX under fractional frequency reuse (FFR) model. Conventional cellular planning methods can be used for broadband wireless access systems that operate in point-to-multipoint (PMP) configuration based on OFDMA/OFDM such as WiMAX. As an alternative planning method, FFR has been recently proposed for OFDMA/OFDM based cellular systems. FFR divides the cell into two regions: the inner and outer cell. Mobile Stations (MS) inside the inner cell can use the entire frequency band (achieving full frequency reuse), while MSs in the outer ring use a fraction of the band (having fractional frequency reuse). Transmissions in the inner and outer cells occur during different time periods so that users at the cell edge experience less interference. In this thesis, we investigate the effect of dynamically changing the number of subcarriers allocated to inner and outer cells. We use two metrics: total cell throughput and Jain’s fairness index for the distribution of cell throughput among MSs. As the ratio of subcarriers allocated to inner cell increases, the total cell throughput increases while the fairness index decreases. We use the product of cell throughput and fairness index in order to study the trade-off between the two metrics. We show that by dynamically adjusting the ratio of subcarriers allocated to the inner cell based on the user distribution, the throughputen_US
dc.description.degreeM.S.en_US
dc.description.provenanceMade available in DSpace on 2016-01-08T18:15:45Z (GMT). No. of bitstreams: 1 0006015.pdf: 843750 bytes, checksum: 3c945c545eeab3fc294575086db3fc4f (MD5)en
dc.description.statementofresponsibilityKar, Görkemen_US
dc.format.extentxiii, 50 leaves, illustrationsen_US
dc.identifier.urihttp://hdl.handle.net/11693/15261
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectWiMAXen_US
dc.subjectFFRen_US
dc.subjectsubchannel allocationen_US
dc.subject.lccTK5103.2 .K37 2011en_US
dc.subject.lcshWireless communication systems.en_US
dc.titlePerformance of static and adpative subchannel allocation schemes for fractional frequency reuse in WiMAX networksen_US
dc.typeThesisen_US

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Dept. of Electrical and Electronics Engineering - Master's degree