疊加合成非線性放大16QM高速調(diào)制技術(shù)的研究.pdf

1、分類號UDC密級編號中國科學(xué)院研究生院博士學(xué)位論文cioo267疊加金盛韭線性趑太里魚Q叢直逵遢劍撞苤趁硒究ResearchoftheHigh——speedNonlinearlyAmplified16Q／h～lModulationbyFoldingTwoQPSKSignals指導(dǎo)教師登齷左硒究旦職稱(職務(wù))嬰究旦單位名稱及地址主墾型堂醫(yī)窒悶型堂生廑旦硒究主!墜申請學(xué)位級別盟學(xué)科專業(yè)名稱窒悶塑堡堂論文提交日期20063論文答辯日期呈QQ魚

2、：壘培養(yǎng)單位主國型堂暄空間型堂皇座旦硒究主!墜學(xué)位授予單位主墾型堂院嬰究生瞳答辯委員會主席——年月日N№16QAM，sQAM高速調(diào)制技術(shù)用于衛(wèi)星通信，對擴(kuò)寬衛(wèi)星通信業(yè)務(wù)，促進(jìn)衛(wèi)星通信的發(fā)展，具有積極意義。關(guān)鍵詞：NLA16QAMNLA16SQAMQPSKSQPSKIJF疊加調(diào)制非線性放大飽和高速AbstractHigh—speeddigitaImodulationisoneofthekeytechnologiesincommunicat

3、ionsystem，NowtheQPSKjsthemostcommonjnspacecommunicationinthewoddbutitsspectralefficiencyisonly2b／s／HzWnhthedevelopingofthespacecommunication，thefrequencyspectralbecomesmoreandmorecrowdedsotheQPSKbecomesaboUleneckThespect

4、raIefficiencyof16QAMis4b／s／Hz。whichhigherthanitofQPSKButtheconventionaImethod。thatisQuadratureAmplitudeModula的n。mustbeadoptinglinearamplifierbecausethe16QAMsignalismultilevelThelinearamplifiercanonlywerkinunsaturatedstat

5、ethentheefficiencyisveryIowsesultinthepreciousenergyresourceinspacecraffswaswastedFromnowonlytheINTEISATdidthe16QAMexperimentsinspacecommunicationandtheir16QAMismadebyconventionaImethodanditsdatarateisnothighForQAMbeappl

6、iedinspace‘communicationThispaperstudyanunconventionaImethodoffoIdingtwoQPSKmodulatedsignalstomakea160AMmodulatedsignalwhichisfitfortransmittinghigh—speeddatainthesatellitesThispaperpresentshowtomake16QAMsignaIbyfoIdingt

7、woQPSKsignalsDliferentfromtheconventionalQAMthemethodoffoIdingtwoQPSKistogeneratethestrong16QAMsignalbycombiningtwoQPSKsignalswhichhavebeenamplifiedbyeachsaturatedamplifierThismethodcannotonlyimprovethespectraIe仟iciencyb

8、utalsomakefulluseofthepreciousenergyonsatellitesThe16QAMgeneratedbythismethodisnamedNLA16QAMThedatarateoftheNLA16QAMexceed200Mb／sinLbandwhenEVMIessthan859％ForthemoreInthepaperIhavestudiedthemoreadvancedN16SQAM，|JFNLA16QA