基于OFDM的沙塵暴環(huán)境下協(xié)同通信系統(tǒng)的研究.pdf

1、獨創(chuàng)性聲明本人聲明所呈交的論文是我個人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。盡我所知，除了文中特別加以標(biāo)注和致謝的地方外，論文中不包含其他人已經(jīng)發(fā)表或撰寫過的研究成果，也不包含為獲得寧夏大學(xué)或其它教育機(jī)構(gòu)的學(xué)位或證書而使用過的材料。與我一同工作的同志對本研究所做的任何貢獻(xiàn)均已在論文中作了明確的說明并表示了謝意。研究生簽名：曹宇時間：2護(hù)l弓年6月弓秒日關(guān)于論文使用授權(quán)的說明本人完全了解寧夏大學(xué)有關(guān)保留、使用學(xué)位論文的規(guī)定，即：學(xué)校

2、有權(quán)保留送交論文的復(fù)印件和磁盤，允許論文被查閱和借閱，可以采用影印、縮印或掃描等復(fù)制手段保存、匯編學(xué)位論文。同意寧夏大學(xué)可以用不同方式在不同媒體上發(fā)表、傳播學(xué)位論文的全部或部分內(nèi)容。研究生簽名：營寧時間：2_o13年萬月弓口日導(dǎo)師簽名：擁v嚳亥時IB7：≥奄／弓年r月咖日0oAbstractDuringthewirelesscommunications，themainfactorsthatinfluencedthequalityofwi

3、relesscommunicationiSthecomplexityofthetransmissionenvironmentandmultipathfadingofwirelesssignalsThetransmissionenvironmentinthesandduststormiSmorecomplexthanthatintheurbanenvironmentTherearemanyfactorsthatcaninfluenceth

4、etransmissionofelectromagneticwave，suchasthelOSSofsignaltransmissioninthesandstormchanneltheattenuationthatcausedbythewatercontentandvisibilityofthesandstorm，thepolarizationeffectofdustparticlesinfluenceonelectromagnetic

5、waves，thescatteringeffectofdustparticles，andSOonTherearemanyfactorsthatinfluencethepropagationofelectromagneticwaveinthesand—stormenvironment，thescatteringeffectsofdustparticleisoneofthemajorfactors，SOthispaperfocusesont

6、hedustparticlesscatteringfunctionThescatteringofdustparticlesinevitablybringsthemultipathtransmissionofthesignal，multipathpropagationwillbringthemultipathfadingofthesignalTherefore，multipathfadingwillbecomeoneofthemainfa

7、ctorsthataffectthequalityofsignaltransmissionCooperativecommunicationtechnologyandOFDMtechnologyhasgoodanti—fadingabilitySOcombiningthetwotechnologiesinthecommunicationsystemofduststorms，whichcanguaranteethesignaltransmi

8、ssiontimelyandcorrectlyThispaperiSbasedonthecharacteristicsofcooperativecommunicationandsandduststormenvironmentFirstofall，itmakessomeintroduceaboutcooperativecommunication，andsomekeytechnologiesofcooperativecommunicatio

9、niSdiscussedInthediscussionofcooperativecommunicationkeytechnologies：diversitycombiningtechnologyisdiscussed，thenthethreemaindiversitycombiningtechnologyisdiscussedandcompared；Thentheselectionofrelaynodeandpowerallocatio

10、nincooperativecommunicationareintroducedInthecomparisonofthreediversitycombiningways，itcancometotheconclusionthatusingdiversitycombiningtechnologycanimprovesystemperformanceBecauseofitsgoodperformanceandeasyrealization，E

11、GCmodeiswidelyusedinthecooperativecommunicationsystemNext，inthispaperthecooperativecommunicationmodelandtheimpactofelectromagneticwavepropagationinthesanddustenvironmentaredoneresearchandanalysisIntheresearchofcooperativ

12、ecommunicationmodelandperformance，itmainlyaimedatAmplify—andForward(AF)modleandDecode—and—Forward(DF)modle，thenitcanbuildthemodlesandcometotheconclusionolAFandDEItistheconclusion：whenusingcollaborativemodetocommunicate，i

13、tcaneffectivelyimprovethesystemperformance，anditisthelow—ordermodulationmethodthatcanhelpthesystemkeepinagoodsituationFinallyaccordingtotheinfluencethatelectromagneticwavespreadinthesandduststormenvironment，combiningOFDM

14、technologyandcooperativecommunicationtechnologythatcanovercometheinfluencecausedbydustparticlescatteringinsandduststorm。Theresearchaboutsandstormcollaborativecommunicationsystemisfromthreeaspects：theinfluencethatsandstor

15、mchanneleffectsonOFDMcooperativesystem；theinfluencethatthequalityofcooperativecommunicationchannelbetweensourcenodeandrelaynodeeffectsonOFDMcooperativesystem；Thenode’Slocationoftherelayimpactsoncooperativecommunicationsy