基于譜分析原理實(shí)現(xiàn)FSK接收機(jī)的研究.pdf

1、㈣㈣分類號(hào)：——UDC：——密級(jí)：——編號(hào)：——工學(xué)碩士學(xué)位論文基于譜分析原理實(shí)現(xiàn)FSK接收機(jī)的研究碩士研究生：劉虹霞指導(dǎo)教師：付永慶教授學(xué)位級(jí)別：工學(xué)碩士學(xué)科、專業(yè)：信號(hào)與信息處理所在單位：信息與通信工程學(xué)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(xué)位授予單位：哈爾濱工程大學(xué)哈爾濱。l：程人學(xué)碩十學(xué)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