基于譜分析原理實現(xiàn)FSK接收機的研究.pdf

1、㈣㈣分類號：——UDC：——密級：——編號：——工學碩士學位論文基于譜分析原理實現(xiàn)FSK接收機的研究碩士研究生：劉虹霞指導教師：付永慶教授學位級別：工學碩士學科、專業(yè)：信號與信息處理所在單位：信息與通信工程學院論文提交日期：2008年1月4日論文答辯日期：2008年1月17日學位授予單位：哈爾濱工程大學哈爾濱。l：程人學碩十學何論文ABSTRACTOntheFSK(FrequencyShiftKeying)digitalreceiver

2、，thesignalisdemodulatedmainlybyfrequencydiscriminationExceptelectronicreconnaissancereceiver，MFSK(MaryFrequencyShiftKeying)receiver，OFDM(OrthogonalFrequencyDivisionMultiplexing)receiverspectrumanalysismethodofreceiversch

3、emeisrarelyusedinconventionalreceiverThispaperismainlyontheproblemoftheFSKdemodulationalgorithmsandimplementationofreceiverbasedonthespectrumanalysisprincipleAnewalgorithmofdemodulate2FSKsignalbasedonperiodogramispropose

4、dItcombinestheperiodogrammethodofpowerspectrumestimationandtheDSTFTtogetthetimefrequencyrelationshipofthereceivingsignal，andthe2FSKsignalisdetectedbyanalyzingthetime—frequencyrelationship，thenthepurposeofthedemodulationi

5、sreachedInthispaper，theprincipleofperiodogramdemodulationalgorithmisresearcheddeeply，andinordertoimplementtheFSKreceiver，themathematicalmodelandthetheoreticaldeductionofthecriticalparametersisdonebasedonperiodogrammethod

6、Thetheoreticalformulashavebeengiven，includingpowerspectrumcomputationexpressionsoftwocarrierfrequencypointsintheslidingwindow，thesignalnoiseratiocomputationexpressionsoftwocarrierfrequencypointsunderadditivegaussianwhite

7、noiseenvironment，thesignaldetectionthresholdcomputationexpressionandtherelationshipbetweensignalnoiseratioandsymbolerrorrateDuetotheroundingoperationandspectrumleakagewhenseekingthedigitalfrequencypointsoftwocarriers，the

8、spectrumpeakvaluesarehardtobefoundaccuratelyinpracticalapplicationThemethodofsearchingthemaximumvaluesofspectrumpeaksaroundthefrequencypointsareusedinthispaperTheperformanceofalgorithmresearchedisanalysisedbyexperimental