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A Study of Rough Surface Scattering Phenomena in the LMDS Band (28 GHz)

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dc.contributor.authorDillard, Cindy Linen
dc.contributor.committeechairBostian, Charles W.en
dc.contributor.committeememberSweeney, Dennis G.en
dc.contributor.committeememberMidkiff, Scott F.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:32:29Zen
dc.date.adate2003-03-18en
dc.date.available2014-03-14T20:32:29Zen
dc.date.issued2003-02-27en
dc.date.rdate2004-03-18en
dc.date.sdate2003-03-10en
dc.description.abstractIn this study, the properties of the reflected paths and scattering phenomena were investigated in the LMDS band (28 GHz). We used the newly developed sampling swept time delay short pulse (SSTDSP) sounder to collect field data in certain locations on the Virginia Tech campus. The sounder collected the channel impulse response analog waveform, sampled, digitized and reconstructed it. The stored data were used to produce the power delay profile and other channel parameters. In particular, we collected scattered and reflected data regarding the channel response with different incident angle and distance set-ups from brick and limestone walls. We used the reflected pulse width and maximum excess delay derived from each power delay profile to analyze the rough surface scattering phenomena. We found that limestone and brick walls exhibited some diffuse scattering. The reflected pulse of a limestone wall had more maximum excess delay spread than did a brick wall at -15dB power threshold. The mean maximum excess delay for the reflected pulse of the limestone wall measurement set-ups was more than two times that of the brick wall. With equal transmitter and receiver distances to the wall, we found that as the incident angle increased, the maximum excess delay decreased but the perpendicular reflection coefficient increased. It is recommended that for future study, a second generation SSTDSP sounder will replicate the measurement with larger distance and angle set-ups as well as in non-line-of-sight areas.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-03102003-114057en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03102003-114057/en
dc.identifier.urihttp://hdl.handle.net/10919/31439en
dc.publisherVirginia Techen
dc.relation.haspartCDillardThesis.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject28 GHzen
dc.subjectLMDSen
dc.subjectRadio wave propagationen
dc.subjectScatteringen
dc.subjectRough surfaceen
dc.titleA Study of Rough Surface Scattering Phenomena in the LMDS Band (28 GHz)en
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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