基于Gardner算法的位定時(shí)同步研究.pdf

1、南京理工大學(xué)碩士學(xué)位論文基于Gardner算法的位定時(shí)同步研究姓名：朱雪陽申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電路與系統(tǒng)指導(dǎo)教師：韓玉兵20100601Abstract碩士論文AbstractnlepurposeoftimingsynchronizationindigitalcommunicationsistogetthecorrectstartandendofeverysymbolatthereceiverTimingsynchronizatio

2、nisthefundamentalissueofallsynchronizationproblemsindigitalcommunicationsWecall’tgetthedigitalmessagesthataretransmittedwithouttimingsynchronizationTimingrecoveryconsistsoftwodistinctoperations：estimationofthetimingphase

3、；applicationoftheestimatetothesamplingprocessTheformerisreferredtoastimingmeasurement，thelatterastimingcorrectionTimingcorrectionservestoprovidethedecisiondevice、析thsignalsampleswithminimumintersymbolinterference功emainre

4、searchworkofthisthesisincludes：westudythebasictheoryoftimingadjustmentbyinterpolationunderthecircumstancethatsamplingisnotlockedtotheincomingdataThenwemakesomeeffortstodiscussthetimingrecoveryschemewhichiscomposedofinter

5、polatortimingerrordetector，loopfilterandnumericallycontrolledoscillatoranddothesimulationoftheschemeneestimationofthetimingparameter耐吐Ithemaximumlikelihoodmethodisdiscussedandwereasonedoutthetimingerrordetectoralgorithmb

6、asedonthemaximumlikelihoodestimationComp鐘ed、惦mthemaximumlikelihoodtimingerrordetectortheGardnertimingerrordetectorhasabetterperformancewi廿1asmallertimingVcHianceAdigitalprefilterisproposedinthethesisBycomparingthetimingj

7、itteranderrorratesofthetimingrecoveryscheme、析ththeprefilterandtheconditionwithouttheprefilterweconcludedthatthedigitalprefiltercallbeusedtoeliminatethetimingvarianceandreduceerrorratesKeyword：timingsynchronizationmaximum