π4-dqpsk调制解调关键技术研究及fpga实现

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1、英文摘要ABSTRACTInrecentyears，SoftwaredefinedradioemergesasthetimesrequirealongwiththeteehniqueofdigitalsignalProeessinggrowinguPandthePerformaneeofdigitalProeessinginstrumentbeingeonsummate.It’5basedonthePri一:eiPlesofmoderneommunieationwithdigitalsignalProee

2、ssingforeore，andsuPPortedbytheteehniqueofmiero一eleetronies.ItSbasieeoneePt15makinghardwareasthePlatform，realizingthefunetionofwirelesseommunieationsystemandPersonaleommunieationsystembysoftwareasmuehasPossible.Softwaredefinedradio15calledthethirdrevolutio

3、ninwirelesseommunieationfieldfollowingdigitalcommunieationandmobileeommunieation，anditwillinflueneethefuturedeePly.ThetaskoftoPie15realizing7t/4一DQPSKmodulationanddemodulationsystemfrombasebandtointermediatefrequeneybyFPGA.7t/4一DQPSKmodulation15alinearnar

4、rowbandteehnology，whiehPossessesfeaturesofhighsPectrumutilizationratio，bettersPeetrumsPeeialityandstrongeranti一fadingPerformance.ThemodemmethodhasbeenaPPliedwidelyinmobileeommunieationsystem，satelliteeommunieationsystembeeauseofitsexeellenees.Firstly，This

5、thesisstudiesbasiePrineiPleof兀/4一DQPSKmodulationPartinmodemsystemandmakessolutiontoeaehmodule，emPhasizesPulseshaPingfilterandDDS，emulateseaehkeymoduleinMatlabandPresentstheresults.Seeondly，theresearehstudiesbasiePrineiPleof兀/4一DQPSKdemodulationPartinmodem

6、systelnandmakessolutiontoeachmodule，emPhasizesdifferentialdeteetion，DDCandbitsynehronization，emulateseaehkeymoduleinMatlabandPresentstheresultsalso.ThenextsteP15usingMatlabtoemulatethewholesystemandgettheresult.Onthisfoundation，eaehmodulewillbedesignedbyV

7、HDL(VeryHighSPeedIntegratedCireuitHardwareDeseriPtionLanguage)inQuartusll7.0ofAltera，andtheaeeuraeyoffunetionwillbeProvedthroughtheemulationresult.Next，designPCBfromsehematieDocumenttoeneaPsulation，thentolayoutinProtel99SE.Whenfinishingjointing，downloadth

8、edesignedProeeduretoFPGAmainehiP.Finally，observingsignalwaveform，eonstellationdiagramandeyediagraminoseillograPh.Thissystemsignalsoureerate100kbPs，modulatedintermediatefrequeney10MHz.Theaeeuracyofthe川二重庆人学硕十学位论文syst