A novel OFDM Blind Equalizer: Analysis and Implementation

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dc.contributor.authorGonzalez Fitch, David E.en
dc.contributor.committeechairBose, Tamalen
dc.contributor.committeememberAmanna, Ashwin E.en
dc.contributor.committeememberPratt, Timothy J.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:44:25Zen
dc.date.adate2012-10-10en
dc.date.available2014-03-14T20:44:25Zen
dc.date.issued2012-07-13en
dc.date.rdate2012-10-10en
dc.date.sdate2012-08-28en
dc.description.abstractLink adaptation is important to guarantee robust and reliable wireless communications with- out wasting valuable radio resources. This technique has become more feasible with the recent appearance of Software Defined Radios (SDRs), which allow easy reconfiguration of their parameters via software. As the environment changes over time, the transmitter needs to be able to effectively estimate its performance under different radio input parameters to be able to find a close to optimal solution. In most wireless communications, an equalizer is implemented at the receiver to estimate the channel impulse response. This estimate can be fed back to the transmitter via a feedback channel, which can in turn help generate a sub-optimal transmission solution for the current situation. In this thesis, a link adaptation method is proposed that uses Orthogonal Frequency-Division Multiplexing (OFDM) in conjunction with blind channel estimation. With the use of OFDM, it can be assumed that the frequency fading at each subcarrier is approximately flat. In addition, under the assumption that the channel is quasi-stationary, the Bit Error Rate (BER) at each subcarrier can be estimated by using the well-known BER formulas for an Additive White Gaussian Noise (AWGN) channel. However, the effect of imperfect channel estimation must also be taken into account. A novel OFDM blind channel estimator is developed. Finally, both simulations and real over-the-air results are presented.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-08282012-193626en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08282012-193626/en
dc.identifier.urihttp://hdl.handle.net/10919/34833en
dc.publisherVirginia Techen
dc.relation.haspartGonzalezFitch_DE_T_2012.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectestimationen
dc.subjectcognitiveen
dc.subjectblind equalizeren
dc.subjectOFDMen
dc.titleA novel OFDM Blind Equalizer: Analysis and Implementationen
dc.typeThesisen
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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