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dc.contributor.authorDillard, Cindy Linen_US
dc.date.accessioned2014-03-14T20:32:29Z
dc.date.available2014-03-14T20:32:29Z
dc.date.issued2003-02-27en_US
dc.identifier.otheretd-03102003-114057en_US
dc.identifier.urihttp://hdl.handle.net/10919/31439
dc.description.abstractA Study of Rough Surface Scattering Phenomena in the LMDS Band (28 GHz) Cindy Lin Dillard (ABSTRACT) In 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_US
dc.publisherVirginia Techen_US
dc.relation.haspartCDillardThesis.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subject28 GHzen_US
dc.subjectLMDSen_US
dc.subjectRadio wave propagationen_US
dc.subjectScatteringen_US
dc.subjectRough surfaceen_US
dc.titleA Study of Rough Surface Scattering Phenomena in the LMDS Band (28 GHz)en_US
dc.typeThesisen_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineElectrical and Computer Engineeringen_US
dc.contributor.committeechairBostian, Charles W.en_US
dc.contributor.committeememberSweeney, Dennis G.en_US
dc.contributor.committeememberMidkiff, Scott F.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03102003-114057/en_US
dc.date.sdate2003-03-10en_US
dc.date.rdate2004-03-18
dc.date.adate2003-03-18en_US


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