Beam coding with spread spectrum orthogonal gold codes in underwater acoustic systems

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buir.advisorKƶymen, Hayrettin
dc.contributor.authorBeder, AndaƧ
dc.date.accessioned2016-04-15T13:05:12Z
dc.date.available2016-04-15T13:05:12Z
dc.date.copyright2015-10
dc.date.issued2015-10
dc.date.submitted2015-11
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.descriptionCataloged from PDF version of thesis.en_US
dc.descriptionIncludes bibliographical references (leaves 62-63).en_US
dc.descriptionThesis (M.S.): Bilkent University, The Department of Electrical and Electronics Engineering, İhsan Doğramacı Bilkent University, 2015.en_US
dc.description.abstractIn this study, the applicability of beam coding approaches enabling coded transmission with direct sequence spread spectrum (DSSS) signals to multiple high resolution beams in underwater acoustic systems is investigated. Performance of (DSSS) signals for beam coding application is theoretically analyzed and experimentally proved. Instead of conventional (DSSS) parameters maximal length sequence and binary phase shift keying (BPSK) modulation, gold code sequences are more appropriate for multi-user applications due to their better cross-correlation function and minimum shift keying (MSK) modulation is more appropriate for constant amplitude signals due to its phase continuity. Beam coding experiments were carried out with 511 gold chips sequences with Minimum Shift Keying (MSK) modulation to spread over the frequency range of 70 - 90 kHz. The results of these experiments indicate that each coded signal can be separately detectable after signal processing in Matlab. And this shows that the beam coding approach is implementable in underwater acoustic systems.en_US
dc.description.degreeM.S.en_US
dc.description.statementofresponsibilityby AndaƧ Bederen_US
dc.format.extentx, 65 leaves :charts.en_US
dc.identifier.itemidb151765
dc.identifier.urihttp://hdl.handle.net/11693/28904
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectBeam Codingen_US
dc.subjectDirect Sequence Spread Spectrumen_US
dc.subjectGold Code Sequenceen_US
dc.subjectMinimum Shift Keyingen_US
dc.titleBeam coding with spread spectrum orthogonal gold codes in underwater acoustic systemsen_US
dc.title.alternativeSualtı akustik sistemlerde yayılı izge tekniğini kullanarak ortogonal gold kodlar ile hĆ¼zme kodlamaen_US
dc.typeThesisen_US
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