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Performance Analysis of Network Coding Techniques and Resource Allocation Algorithms in Multiuser Wireless Systems

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dc.contributor.authorYan, Yueen
dc.contributor.committeechairda Silva, Claudio R. C. M.en
dc.contributor.committeememberReed, Jeffrey H.en
dc.contributor.committeememberEllingson, Steven W.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2017-04-04T19:49:53Zen
dc.date.adate2011-10-07en
dc.date.available2017-04-04T19:49:53Zen
dc.date.issued2011-09-09en
dc.date.rdate2016-10-18en
dc.date.sdate2011-09-26en
dc.description.abstractThe following thesis consists of two main contributions to the fields of network coding and resource allocation. The first is a quantitative analysis of the effects of channel estimation errors and time synchronization errors on the performance of different network coding algorithms. It is shown that the performance improvement gained by a relay-based network scheme is significant for small number of users and when the quality of the relay link is better than that of the direct link. However, it is shown that potential performance improvement resulting from the considered relay-based network coding scheme could be negated by channel estimation errors. To consider the effects of time synchronization errors, we study a digital network coding (DNC) system and a physical-layer network coding (PNC) system with non-coherent frequency shift keying (FSK) modulation. For each of these two systems, we investigate the effects of received Eb/N0, unequal link quality, and time synchronization errors. The second contribution is an analysis of the value and cost of cognition obtained by investigating three resource allocation algorithms with different levels of channel knowledge in the context of ad hoc networks. The performance (quantified in terms of "percentage of users reaching target data rate" and "average effective data rate") and cost ("power consumption" and "number of channel estimations") of these algorithms are analyzed. Results show that a resource allocation algorithm with a higher level of channel knowledge results in better performance, but greater cost in terms of number of channel estimations, as expected. In addition, a resource allocation algorithm with a higher level of channel knowledge converges quicker when channel adaptation are necessary. Both an ideal medium access control (MAC) protocol and a non-ideal MAC protocol (dedicated control channel) are considered.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-09262011-134203en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09262011-134203/en
dc.identifier.urihttp://hdl.handle.net/10919/76872en
dc.language.isoen_USen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjecttime synchronizationen
dc.subjectresource allocationen
dc.subjectchannel estimationen
dc.subjectCognitive radio networksen
dc.subjectnetwork codingen
dc.titlePerformance Analysis of Network Coding Techniques and Resource Allocation Algorithms in Multiuser Wireless Systemsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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