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dc.contributor.authorRieser, Christian Jamesen_US
dc.date.accessioned2014-03-14T20:45:42Z
dc.date.available2014-03-14T20:45:42Z
dc.date.issued2001-07-17en_US
dc.identifier.otheretd-09202001-004617en_US
dc.identifier.urihttp://hdl.handle.net/10919/35113
dc.description.abstract

This thesis describes the theoretical development, design, and implementation of a novel measurement system, called a Sampling Swept Time Delay Short Pulse (SSTDSP) wireless channel sounder, capable of real time in field performance characterization of high speed fixed wireless links. The SSTDSP sounder has been designed to provide vital performance metrics for fixed point high data rate applications in the 28 GHz LMDS band at a fraction of the cost and complexity of existing wideband channel sounders.

The SSTDSP sounder monitors the behavior of the LMDS channel by sampling the impulse response of the channel in real time. This digitized impulse response is used to assemble a power delay profile and render real-time channel performance metrics such as the mean excess delay, RMS delay spread, maximum excess delay for a given multipath threshold, and coherence bandwidth. The SSTDSP sounder is capable of recording these metrics through three modes of operation - continuous channel monitoring, single instant channel snapshot, or data logging. Swept time delay time dilation processing is combined with precise sample and hold gating to reduce the analog to digital converter sampling rate required to digitize the nanosecond short pulses from 2 Gsps to 1 Msps, while retaining the required effective Nyquist sampling rate of 2 Gsps. This dramatically reduces the memory, digital signal processing, and data logging storage requirements as well as the overall cost of the sounder system.

The thesis presents the theory behind channel sounding and discusses whether there is a "bounce path" available to LMDS. Several existing channel sounding methods are compared for this application. A number of specific design and performance criteria from each of these methods are synthesized to produce the Sampling Swept Time Delay Short Pulse Sounder architecture. The design and implementation process used to realize the SSTDSP sounder is presented, including a system overview, module details, and algorithm development details. A calibration and measurement test procedure is outlined and system verification results are presented.

Current work in progress on the test platform and future improvements to the modular system are outlined, as well as conclusions and future implications of the system.

en_US
dc.publisherVirginia Techen_US
dc.relation.haspartCJRieserVTMSEEThesis092201.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.subjectGlobal Positioning Systemen_US
dc.subjectUltra Wide Banden_US
dc.subjectDirect Digital Synthesisen_US
dc.subjectBroadbanden_US
dc.subjectDigital Signal Processingen_US
dc.subjectChannel Sounderen_US
dc.subjectLMDSen_US
dc.subjectWirelessen_US
dc.subjectSSTDSPen_US
dc.titleDesign and Implementation of a Swept Time Delay Short Pulse (SSTDSP) Wireless Channel Sounder for LMDSen_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.committeememberBostian, Charles W.en_US
dc.contributor.committeememberPratt, Timothy J.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09202001-004617/en_US
dc.contributor.committeecochairReed, Jeffrey Hughen_US
dc.contributor.committeecochairSweeney, Dennis G.en_US
dc.date.sdate2001-09-20en_US
dc.date.rdate2002-09-23
dc.date.adate2001-09-23en_US


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