無線空間光通信多載波調(diào)制降低峰均比的研究與實現(xiàn).pdf

1、西安理工大學碩士學位論文無線空間光通信多載波調(diào)制降低峰均比的研究與實現(xiàn)姓名：張宏偉申請學位級別：碩士專業(yè)：通信與信息系統(tǒng)指導教師：柯熙政20080301Title：THESEARCHANDIMPLEMENTOFREDUCINGPEAKAVERAGE—POWERINFREESPACEOPTICALCOMMUNICATIONMULTICARRERSMODULATIONSYSTEMMajor：CommunicationandInformati

2、onSystemAuthor：HongweiZhangSupervisor：ProfXizhengKeAbstractsignatures|qnatur一1lansmissionschemeofMCM(MultiCarriersModulation)isbecomingmorepopulargraduallywhichapplyparalleltransmissionmodeMCMCanstronglycombatmulti。pathf

3、adinganddispersivechannelinterference，increasefrequencyefficiencyandbuilduptheabilityofresistingnoiseTherefore，itisahotspotinvestigatedinradiofrequencycommunicationatpresentFreespaceopticalcommunicationhasmanyadvantages：

4、greatcommunicationcapacity，highbitrate，highsecurity，broadbandwidthandgoodperformanceonantijammingIfweapplyMCMtechniquetoFSOcommunication，itwillimprovebitrateorreducedemandofapparatusrate，andithasadvantagesaboutdecreaseim

5、plementcostandcomplexityofcommunicationsystemIfwecombinethetwotechniques，theywillexerteachadvantage，andavoidshortcomingsHoweverintegrationofthetwotechniqueshassomedisfigurementsasfollows，comparingtosinglecarriertechnique

6、Highpeaktoaveragepowerratio(PAPR)isoneofprincipledrawbacksofmulti。carriertechnique，wmchrestrictsitsextensiveapplicationsBecauseofinformationtransferringuncertaintylotsofsubcarrierspeakaresuperposedandhighvalueisproduced，

7、SOthatlasersares秈ated，、vhichcalldamagelasersThethesismainlyfocusesonthetechniquesofPAPRreductionwllichisoneofkeytechniquesinmulticarriermodulationofFSOWehaveachievedthefollowingwork：(1)Thepaperanalyseswhyweadopttransmiss

8、ionschemeofMCM(Multi_CarriersModulation)，weintroduceaparticularchannelcharacteristicsinmuticarriermodulationsystemofwirelesslasercommunication，includingatmospherelaserattenuationandmultipatheffect’Andrecommendstructurean