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1、代號(hào)10701分類號(hào)TN9113學(xué)號(hào)0408120502密級(jí)???.竺耍???.西簧電子料較袁譽(yù)碩士學(xué)位論文題(中、英文)目深空通信中組合調(diào)制解調(diào)技術(shù)的研究ResearchonCombinationModulationandDemodulationTechnologyInDeepSpaceCommunication作者姓名郭婧娜指導(dǎo)教師姓名、職務(wù)張輝教授學(xué)科門類工學(xué)學(xué)科、專業(yè)通信與信息系統(tǒng)提交論文Et期二oo七年一月摘要深空通信巾的組合調(diào)制解調(diào)技術(shù)是通過研究深空信道獨(dú)特的特點(diǎn),結(jié)合現(xiàn)代高效數(shù)字調(diào)制解調(diào)技術(shù)及其它信號(hào)處理方式來對(duì)深空通信的發(fā)送和接收信號(hào)進(jìn)行處理,以達(dá)到較好的接收效果。主要
2、研究適合深空信道傳輸?shù)木哂泻愣ɑ驕?zhǔn)恒定包絡(luò)的高效數(shù)字調(diào)制方式與直接序列擴(kuò)頻相結(jié)合的組合調(diào)制解調(diào)方式。本文以具有較高功率利用率和頻帶利用率的恒包絡(luò)QPSK調(diào)制、連續(xù)相位GMSK調(diào)制為主要原型,將這些適合深空通信的調(diào)制方式‘手卣接序ytJ$1‘頻調(diào)制相組合,輔以其它的信號(hào)處理方式,來增強(qiáng)單一調(diào)制的系統(tǒng)性能,進(jìn)行了系統(tǒng)性能仿真,仿真結(jié)果主要是誤碼率的分析。同時(shí)也研究了具有更高頻譜利用率的準(zhǔn)恒定包絡(luò)調(diào)制方式IJF.OQPSK和VQPSK調(diào)制方式。在建立了整個(gè)組合調(diào)制解調(diào)系統(tǒng)結(jié)構(gòu)的基礎(chǔ)上,結(jié)合實(shí)際通信環(huán)境,進(jìn)一步優(yōu)化系統(tǒng)性能,從理論分析和仿真結(jié)果兩方面驗(yàn)證該體制的可行性。并對(duì)該組合調(diào)制解調(diào)系統(tǒng)的
3、一些關(guān)鍵技術(shù)進(jìn)行研究和部分實(shí)現(xiàn),為未來深空通信系統(tǒng)設(shè)計(jì)提供技術(shù)支撐。文章最后通過研究MER系統(tǒng)中的高效編碼方式,對(duì)未來深空通信中的編碼調(diào)制技術(shù)進(jìn)行了學(xué)習(xí)和分析。關(guān)鍵詞:深空通信(DSC),調(diào)制解調(diào),直接序列擴(kuò)頻(DS)AbstractAbstraotThebasicideaofCombinationmodulationanddemodulationinDeepSpaceCommunicationisthatintermsofthecharacteristicsofDeepSpacechannel,somehighlyefficientmodulationanddemodulationt
4、echnologycombinedtogetherwithsignalprocessingmethodsareappliedtoachieveabetterreceivingperformance.ThemainpurposeistostudyfurtherintheconstantenvelopeandQnasi—constantenvelopemodulationswithhighmodulationefficiency.ConmantenvelopemodulationsuchasQPSKandcontinuousphase··frequencyshiftkeyingsuchas
5、GMSKalesetasbasicexamplesofmodulationanddemodulationschemeinDeepSpaceCommunicationinthisthesis,aswellasquasi—constantenvelopemodulationsuchasIJF—OQPSKandFQPSKarediscussedasthesuitablemodulationscheme,combinedwithDirectSequenceSpectrumSpread(DSSS)technologyandothersignalprocessingmethods.Eachtech
6、nologyisfocusedOilcertaincharacteristicofdeepspacecommunication,oncombiningthesemethodsandmodifyingsomeparameters,abettersystemperformancecanbegot.Onthefoundationoftheholisticmodulationanddemodulationframearchitecture,thesystemisoptimizingfurther.Thefeasibilityoftheschemecarlbedemonstratedthroug
7、hacademicanalysisandsoftwaresimulation,SOthattechnicalsupportcanbeofferedtodeepspacecommunicationinfuture.Aftercare如lstudyofthecodingschemeinMERsystem.somecodingmodulationsthatmaybeappliedinfuturedeepspacecommunicationaleals