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Nzéza, C. N.
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document
Blind synchronization and sequences identification in CDMA transmissions
Abstract
Blindsequencesestimationmethods,whichwork withoutpriorknowledgeaboutthetransmitter,have beenproposedin[1]-[3] ;buttheyarerestrictedto asingle-usercontext.Here,weextendtheapproach originally proposed in [2] to the multi-user context. We have developed a fast and efficient blind synchronization criterionbasedonthebehaviorofthe FROBENIUS squarenormofasubmatrixthatscanstheintercepted signalcorrelationmatrix.Byusingeigenanalysis techniquesandtheoreticallinearalgebraresults,we provethatthemaximaofthiscriterioncorrespond tothesynchronizationtimeswithtransmitters.Then,eigenanalysis techniques allow to estimate the spreading sequences. Eigenanalysis was associated with additional processing modules aimed at solving dephasing problems due to the transmission channel.