An eigenstructure technique for direct sequence spread spectrum synchronization

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dc.contributor.authorMangalvedhe, Nitin R.en
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:30:50Zen
dc.date.adate2009-03-04en
dc.date.available2014-03-14T21:30:50Zen
dc.date.issued1995en
dc.date.rdate2009-03-04en
dc.date.sdate2009-03-04en
dc.description.abstractAn important aspect of all spread spectrum receivers is synchronization. The harsh radio environment has necessitated the development of fast and robust techniques. Current techniques for direct sequence spread spectrum (DSSS) synchronization, although rapid, are not robust to multiple access interference. This is because they require the spreading codes of the multiple access network to have very good cross correlation properties. In this thesis, a novel technique for DSSS synchronization is investigated. This technique, termed as the eigenstructure technique, introduces a new approach to synchronization, called soft synchronization, by which spread spectrum despreading is performed with estimates of the spreading code obtained from the received signal, starting at an early stage. As more data is collected, the code estimate improves and so does the quality of the despread data. The key advantage of the soft synchronization technique is that excellent despread data can be obtained using imperfect, but early, code estimates. The eigenstructure technique exploits the cyclostationarity property of the DSSS signal. It can theoretically provide perfect code estimates for signals received in arbitrary levels of white background noise and with arbitrary timing offsets and is insensitive to frequency offsets on the received signal. It is applicable to DSSS signals with a constant modulus code and requires the knowledge of only the code repetition rate. The technique is robust to multiple access interference provided the users have different code repetition rates.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 106 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-03042009-040521en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03042009-040521/en
dc.identifier.urihttp://hdl.handle.net/10919/41398en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1995.M364.pdfen
dc.relation.isformatofOCLC# 34067030en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1995.M364en
dc.titleAn eigenstructure technique for direct sequence spread spectrum synchronizationen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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