dc.contributor.advisor | Karaşan, Ezhan | |
dc.contributor.author | Kar, Görkem | |
dc.date.accessioned | 2016-01-08T18:15:45Z | |
dc.date.available | 2016-01-08T18:15:45Z | |
dc.date.issued | 2011 | |
dc.identifier.uri | http://hdl.handle.net/11693/15261 | |
dc.description | Ankara : The Department of Electrical and Electronics Engineering and the Institute of Engineering and Sciences of Bilkent Uniersity, 2011. | en_US |
dc.description | Thesis (Master's) -- Bilkent University, 2011. | en_US |
dc.description | Includes bibliographical references leaves 48-50. | en_US |
dc.description.abstract | We 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 throughput | en_US |
dc.description.statementofresponsibility | Kar, Görkem | en_US |
dc.format.extent | xiii, 50 leaves, illustrations | en_US |
dc.language.iso | English | en_US |
dc.rights | info:eu-repo/semantics/openAccess | en_US |
dc.subject | WiMAX | en_US |
dc.subject | FFR | en_US |
dc.subject | subchannel allocation | en_US |
dc.subject.lcc | TK5103.2 .K37 2011 | en_US |
dc.subject.lcsh | Wireless communication systems. | en_US |
dc.title | Performance of static and adpative subchannel allocation schemes for fractional frequency reuse in WiMAX networks | en_US |
dc.type | Thesis | en_US |
dc.department | Department of Electrical and Electronics Engineering | en_US |
dc.publisher | Bilkent University | en_US |
dc.description.degree | M.S. | en_US |