OFDM系統(tǒng)采樣及ZP-OFDM系統(tǒng)定時盲同步.pdf

1、西安電子科技大學學位論文獨創(chuàng)性(或創(chuàng)新性)聲明本人聲明所呈交的論文是我個人在導師指導下進行的研究工作及取得的研究成果。盡我所知，除了文中特別加以標注和致謝中所羅列的內容以外，論文中不包含其他人已經發(fā)表或撰寫過的研究成果；也不包含為獲得西安電子科技大學或其它教育機構的學位或證書而使用過的材料。與我一同工作的同志對本研究所做的任何貢獻均已在論文中做了明確的說明并表示了謝意。申請學位論文與資料若有不實之處，本人承擔一切相關責任。本人簽名：日期

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3、在一年解密后適用本授權書。本人簽名：導師簽名：日期：絲垡苧!f日期：竺!!!yAbstractOrthogonalfrequencydivisionmultiplexing(OFDM)systemsarewidelyadoptedbythefieldofcivilandmilitaryandbecomeahottopicinmodemcommunications，fortheirinherentequalizationsimplicit

4、yimmunitytonarrowbandinterferenceandhighspectrumefficiencyFortheenvironmentofnoncooperativecommunicationsystem，thisthesiscarriesoutresearchontheissuesofsynchronizationforOFDMsystemdeeplyThemaincontentsareasfollows：Firstl

5、ythemodelofOFDMsystemsinthepracticalnoncooperationcommunicationsisconstructedinthethesisThecyclicprefix(cP)ofCP—OFDMsystemsandthemethodofsuperpositionbyafewlastdatacoveragearealsodiscussed，andexpresstheimportanceoftiming

6、synchronizationinZPOFDMsystemsAndthentheinfluenceofsamplingfrequencyoffset(SFO)forOFDMsystemsinmultipathfadingchannelsisderived，basedonwhichthethesisisproposedablindestimationalgorithmofsamplingfrequencyoffsetforOFDMsyst

7、emovermultipathchannelsTheproposedalgorithmfirstlyusedanimprovedcyclespectrumtomakeacoarseestimationoftherelativepointandthenestimatedaccuratelytherelativepointthroughanotherimprovedcyclespectrumFinallytheestimatedvalues

8、ofsamplingfrequencyoffsetweregajnedbytherateofchangeofthephaseofthecyclespectrumintherelativepointafterjumpingphasechangeandleastsquarefittingAfterthatamethodusingaveragepowerratiodistributedregularlyindoubleslidewindows

9、isintroducedbythethesis，forwhoseaccuracydeclinedrasticallyovermultipathfadingchannels，anothermethodusingaveragepowerratiodistributedregularlyindoubleslidewindowshavingdifferentlengthsisproposedFinallyonthebasisofthisprog

10、ram，animprovedenergyratiodetectionmethodiSsetoutThesimulationresultsshowthattheblindestimationalgorithmproposedofsamplingfrequencyoffsetforOFDMsystemovermultipathchannelshasbetterperformancethantheexistingmethod，whichcou

11、ldrealizethesamplingfrequencyoffsetestimationforOFDMsystembeforetimeandfrequencysynchronizationTheproposedalgorithmnotonlyreducestheinfluenceofmultipathfadingandnoisebutalsohashigherestimationaccuracyandagoodrobustnessTh

12、eimprovedmethodofdetectionfordoublewindowenergyratiostillhasagoodperformance，andadeclineinthequalityofthechannelhaslittleeffectontheproposedmethodThesimulmionresultsshowthegoodrobustnessoftheimprovedmethodtomultipathchan