Coherent Mitigation of Radio Frequency Interference in 10-100 MHz

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dc.contributor.authorLee, Kyehunen
dc.contributor.committeechairEllingson, Steven W.en
dc.contributor.committeememberReed, Jeffrey H.en
dc.contributor.committeememberBuehrer, R. Michaelen
dc.contributor.committeememberSafaai-Jazi, Ahmaden
dc.contributor.committeememberBeattie, Christopher A.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:16:06Zen
dc.date.adate2008-10-07en
dc.date.available2014-03-14T20:16:06Zen
dc.date.issued2008-08-28en
dc.date.rdate2008-10-07en
dc.date.sdate2008-09-10en
dc.description.abstractThis dissertation describes methods of mitigating radio frequency interference (RFI) in the frequency range 10-100 MHz, developing and evaluating coherent methods with which RFI is subtracted from the afflicted data, nominally resulting in no distortion of the underlying signals. This approach is of interest in weak signal applications such as radio astronomy, where the signal of interest may have interference-to-noise ratio much less than one, and so can be easily distorted by other methods. Environmental noise in this band is strong and non-white, so a realistic noise model is developed, with which we characterize the performance of signal parameter estimation, a key component of the proposed algorithms. Two classes of methods are considered: "generic" parameter estimation/subtraction (PE/S) and a modulation-specific form known as demodulation-remodulation ("demod--remod") PE/S. It is demonstrated for RFI in the form of narrowband FM and Broadcast FM that generic PE/S has the problem of severely distorting underlying signals of interest and demod-remod PE/S is less prone to this problem. Demod-remod PE/S is also applied and evaluated for RFI in the form of Digital TV signals. In both cases, we compare the performance of the demod-remod PE/S with that of a traditional adaptive canceling method employing a reference antenna, and propose a hybrid method to further improve performance. A new metric for "toxicity" is defined and employed to determine the degree to which RFI mitigation damages the underlying signal of interest.en
dc.description.degreePh. D.en
dc.identifier.otheretd-09102008-144356en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09102008-144356/en
dc.identifier.urihttp://hdl.handle.net/10919/28929en
dc.publisherVirginia Techen
dc.relation.haspartDissertation_kyehunSEv4.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectParametric Estimation and Subtractionen
dc.subjectRadio Frequency Interferenceen
dc.subjectCoherent Mitigation Techniqueen
dc.titleCoherent Mitigation of Radio Frequency Interference in 10-100 MHzen
dc.typeDissertationen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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