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簡(jiǎn)介：北京郵電大學(xué)碩士學(xué)位論文80216E系統(tǒng)仿真平臺(tái)的實(shí)現(xiàn)及調(diào)度算法仿真姓名林莉芬申請(qǐng)學(xué)位級(jí)別碩士專業(yè)信號(hào)與信息處理指導(dǎo)教師吳文禮20070318802．16ESYSTEMSIMULATIONFLATFORMANDSIMULATIONOFTHESCHEDUUNGALGOIUTHMSABSTRA玎THEMACLAVERANDTHEPHYLAYERSPECIFICATIONAREDEFINEDIN802．16ESTARDARD．SERVICEFLOWSAREDASSIFIEDINTOTHEUGS，ENPS，RTPS，NRTPSANDBETYPESACCORDINGTOTHEIRQOSREQUIREMENTS，柚DTHEQOSREQUIREMENTSARESATISFIEDBYTHEMACLAYERIILECHANISMSRESPECTIVELY．INTHEPHYLAYER，0兀M／0F1MATECHNIQUESAREINTRODUCEDTOGUARANTEETHERELIABLEDATATRANSMISSIONINVARIOUSPHYSICALENVIRONMENTS．ALTHOUGHPERFECTQOSGUARANTCEAREPROVIDEDFORDIFFEREMSERVICESATTHEBEGINNINGOFTHESTAILDARDIZATIONOFWIRELESSMETROPOLII加AFEANE咐ORL【S，CHEQOS觸MEWORKSTNL咖RESUSEDT0IMPLEMENTQOSSUPPORTARENOT酉VENBYTHESTANDARD，NEITHERIHESCHEDULINGALGORILHMSUSEDIILTHEOFDMAPHYLAYERARCGIVEN．AUOFTHESEISSUESARELEFTFORRESEARCHE塔TOIMPLEMENT．INIHISPAPER，THEDEVEL叩INGPROCESS，THESTACEOFANS鋤DTRE】ⅡDOFIEEESTANDARD802．16ARCINTRODUCED，THEN柚ALVZCTHEMAINTECHNICALCHARADERISTICSOFMEDIAACCESSCONTMLMACLAYERANDPHYSICALLAYEROF802．16EWHICHISONEOFIEEE802．16DROTOCALSANDBASEDONTECHNICAL蛐ALVSISONTHE802．16ESTANDARD，THEEMPHASISGOESTOTHEINTRODUCTIONOFDESI凹OFSYSTEM仃AMEWORKOF802．16ESIMULATIONNATFOM，DEFINATIONOFFILNCTIONSOFTHEFRAMEWORKMODULES，DESCRIPTIONOFTHERELATIONSHIPBEMEENTHEMODULES皿OREOVER’ONOFDMAWIRELESSRCSOURCCSCHEDULINGSERVICESINTHCMACLAYER甜EANALYSED，WEIGLLTEDROUNDMBIN，MAXC／IANDPMPONIONALFAIRSCHEDULINGALGORITHMSAREINTRODUCEDINTHISPAPERANDALLTHESEAIGORITHMSARESIMULATEDFROMASPECTSOFSYSTEMTHROUGHPUTANDEQUITABLENESSUSINGOPNETSIMULATIONT001．KEYWORDS802．16EBROADBANDWIRELESSACCESS～L～CSERV溉NOWSCHEDULINGQOS

簡(jiǎn)介：分類號(hào)UDC．．．．．．．．．．．．．．．．．．．一密級(jí)編號(hào)工學(xué)碩士學(xué)位論文809．16D協(xié)議上行調(diào)度算法研究及WIMAX仿真平臺(tái)實(shí)現(xiàn)碩士研究生指導(dǎo)教師學(xué)位級(jí)別學(xué)科、專業(yè)所在單位論文提交日期論文答辯日期學(xué)位授予單位楊皓馮馳教授工學(xué)碩士信號(hào)與信息處理信息與通信工程學(xué)院2007年2月2007年3月哈爾濱工程大學(xué)哈爾濱I。稃大學(xué)碩十學(xué)位論文ABSTRACTNOWADAYS，INWIRELESSCOMMUNICATIONAREA，WMANWIRELESSMETROPOLITANAREANETWORKSTECHNOLOGYPLAYSMOREANDMOREIMPORTANTROLEINTHEWORLD．ASABROADBANDWIRELESSACCESSSCHEMEFORWMAN，WIMAXHASRECEIVEDPRIMARYCONCERNBECAUSEOFITSOUTSTANDINGSYSTEMPERFORMANCEANDWIDEMARKETOUTLOOK．FORWIMAX，IEEEDRAWSUPASERIESOF802．16STANDARDS．THE802．16STANDARDINCREASESTHEACHIEVEMENT,SOITWILLPROVIDEMOREAPPLICATION．THEPAPERMAINLYUSES802．16DFORREFERENCE．NEXT，THE802．16DMACPROTOCOLISDISCUSSEDEMPHATICALLY,ESPECIALLYMACCOMNLONPARTSUBLAYER,ANDTHENVARIOUSGENERICSCHEDULINGALGORITHMSWHICHALEUSEDINWIREDANDWIRELESSNETWORKAREINTRODUCED．ACCORDINGTOTHECOMPARISONOFTHEEXISTEDSCHEDULINGALGORITHMSINWIRELESSNETWORK,WEOPTIMIZETHEICSDPSALGORITHM，THENDESIGNALLEFFICIENTCLASSBASEDICSDPSSERVICESCHEDULINGSTRATEGYFOR802．16DMACPROTOC01．ITISPROPOSEDTOSOLVETHEPROBLEMOFMIXEDQUALITYOFSERVICE．ATPRESENT，WIMAXDOESN’TSPECIFYTHESIMULATIONPLATFORMINDETAIL，SOIT’SAMEANINGFULTOPICTOREALIZETHEFRAMEWORKOFTHE802．16DMACBASEDONOPNETOANOPNETSIMULATIONPLATFORMISDEVELOPEDPANLY，ANDTHEPERFORMANCEOFTHEKEYFUNCTIONSEVALUATEDVIASIMULATIONEXAMPLES．KEYWORDSWIMAX；802．16D；MACLAYER；QOS；SCHEDULING；OPNET

簡(jiǎn)介：西南交通大學(xué)碩士學(xué)位論文80216中對(duì)多媒體業(yè)務(wù)QOS保證策略的設(shè)計(jì)與仿真姓名邵振菲申請(qǐng)學(xué)位級(jí)別碩士專業(yè)通信與信息系統(tǒng)指導(dǎo)教師方旭明20070401西南交通大學(xué)碩士研究生學(xué)位論文第1L頁(yè)ABSTRACTWIRELESSCOMMUNICATIONISTHEHOTTESTWIRELESSNETWORKINGTECHNOLOGIES．ASONEOFTHEMOSTPROMISINGTECHNOLOGYINTHENEXTGENERATIONNETWORK,THEBROADBANDWIRELESSACCESSBWASYSTEMHASEVENDRAWNMUCHATTENTION．FORTHESAKEOFSATISFYINGTHEREQUIREMENTOFTHEFUTUREBROADBANDWIRELESSACCESS，THEIEEESTANDARDIZATIONORGANIZATIONHASBROUGHTFORWARDTHESERIESOFIEEE802．16STANDARDS．THESESTANDARDSDE丘NETHECRIT舡IONOFPHYLAYERANDMACLAYEROFBROADBANDWIRELESSACCESSAIRIMERFACE．WITHTHEDEVELOPMENTOFWIRELESSCOMMUNICATIONTECHNOLOGY,ALLKINDSOFNEWSERVICESAPPEARONEAFTERANOTHER．ASACOMPETITIVETECHNOLOGYOFTHENEXTGENERATIONOFWIRELESSNETWO咄WIRELESSMETROPOLITANAREANETWORKWMANHASTAKENTHEPROBLEMOFPROVIDING00SGUARANTEESTODIFFERENTAPPLICATIONSINTOCONSIDERATION．BUTDUETOTHELIMITEDBANDWIDTH．ITISDI伍CULTTOSATISFYTHEOOSREQUIREMENTSOFDIFFERENTSERVICESSIMULTANEOUSLY．HOWEVER,BANDWIDTHSCHEDULINGINMACLAYERISONEOFTHEIMPORTANTPARTSINIMPLEMENTINGOOSGUARANTEE，SOWHETHERANEFFICIENTMACBANDWIDTHSCHEDULINGARCHITECTURECANBEUSEDISVERYIMPORTANT．AIMINGATTHEPROBLEM，AFLEXIBLEQOSMECHANISMISPROVIDEDINTHEMACLAYEROFTHEIEEE802．16STANDARDS，ANDITSUPPORTSMULTIPLEKINDSOFSERVICESFORUSERS．BUTTHESCHEDULINGALGORITHMHASN’TBEENGIVENINTHEIEEE802．16STANDARDS，SOIT’SAMEANINGFULTOPICTORESEARCHTHEMACBANDWIDTHSCHEDULING．BASEDTOTHIS，THEPAPERMAINLYDISCUSSESTHEMACPROTOCOLANDANALYZESMACBANDWIDTHALLOCATIONANDSCHEDULINGARCHITECTURE．INTHEPAPER,THEBACKGROUNDANDDEVELOPMENTPROGRESSOFIEEE802．16STANDARDSAREINTRODUCED，ANDTHECHARACTERISTICS，APPLICATIONSANDNETWORKSTRUCTUREOF802．16AREELABORATED．NE802．16DMACPROTOCOLISDISCUSSEDEMPHATICALLY．THENTHEQOSMECHANISM。THESUPPORTEDSERVICETYPESANDTHEMECHANISMOFBANDWIDTHALLOCATIONOF802．16STANDARDAREANALYZED．BASED011AKINDOFALREADYEXISTEDBAND州DTHALLOCATIONPOLICY,ANEWKINDOFBANDWIDTHALLOCATIONPOLICYISUSED，ANDITCANALLOCATEBANDWIDTHDYNAMICALLYANDFAIRLYAMONGALLKINDSOFSERVICESTOIMPROVETHEUTILIZATIONOFSYSTEMBANDWIDTH’ANDASSURETHE00SCHARACTERISTICSOFALLKINDSOFSERVICESTOCOMPLETETHESCHEDULINGFUNCTION1EFTBYTHESTANDARDS．VARIOUS

簡(jiǎn)介：西安電子科技大學(xué)碩士學(xué)位論文80216E的OFDMA物理層仿真及慢衰落時(shí)變信道估計(jì)研究姓名張彬申請(qǐng)學(xué)位級(jí)別碩士專業(yè)信號(hào)與信息處理指導(dǎo)教師李勇朝20100101ABSTRACTOFDMABROADBANDWIRELESSMOBILESYSTEMBASEDIEEE802．16ECANMEETTHENEEDOFHIGHDATARATEANDMOBILETRANSMISSIONINFUTUREWIRELESSCOMMUNICATIONS，WHICHISEXPECTEDTOSUPPORTHIGHSPEEDMULTIMEDIASERVICESAPPLICATIONSFORMOBILESTATIONSMOVINGATVEHICULARSPEEDS．MOSTWORKONIEEE802．16EOFDMAPHYSICALLAYERFOCUSEDONLOCALINDEPENDENTFUNCTIONALMODULESOFTHESYSTEM，NOTONTHEPERFORMANCEOFTHEOVERALLSYSTEM．MOREOVER，INHIGHSPEEDMOBILEENVIRONMENT，THESLOWFADINGCHANNELSWILLCHANGESLOWLYOVERTIME，ANDNOLONGERSATISFYTHEQUASI．STATICASSUMPTIONS．THEREFORE，THECONVENTIONALSLOWFADINGCHANNELESTIMATIONALGORITHMSBASEDONTHEQUASISTATICASSUMPTIONSARENOTAPPLICABLETOSUCHCHANNELSANYLONGER．AIMINGATTHEABOVEPROBLEMSMENTIONED，ASYSTEMATICSIMULATIONANDSTUDYOFIEEE802．16EOFDMAPHYSICALLAYERAREPRESENTED．USINGTHEGREYMODELINGTHEORY,ANOVELESTIMATIONSCHEMEFORSLOWFADINGTIMEVARYINGOFDMCHANNELSISPROPOSED．THEMAJORCONTRIBUTIONSOFTHISTHESISARESUMMARIZEDBELOW1．THEPERFORMANCEOFOFDMAPHYSICALLAYEROVERTWOCATEGORIESOFINDEPENDENTFADINGCHANNELSISINVESTIGATED．SUICHANNELMODELISUTILIZEDTOEVALUATETHEPERFORMANCEOFOFDMASYSTEMSINTHEFIXEDWIRELESSCHANNEL，INCLUDINGMODULATION，CHANNELCODINGANDINTERLEAVINGANDSOON．ONTHEOTHERHAND，M．1225CHANNELMODELISALSOADOPTEDTOEVALUATEDTHEPERFORMANCEOFTHEBASICMODULES．THESIMULMIONRESULTSSHOWTHATNOMATTERWHICHCHANNELMODELISCHOSEN，THELOWMODULATIONCANALWAYSACHIEVEABEAERPERFORMANCEINHIGHSNRREGION．MOREOVER,WECONCLUDETHATCODINGANDINTERLEAVINGTECHNIQUESCANALSOCONSIDERABLYIMPROVETHEPERFORMANCEOFTHESYSTEM．2．ANOVELGREYMODELINGBASEDESTIMATIONFORNARROWSLOWFADINGTIMEVARYINGOFDMCHANNELSINMOBILEENVIRONMENTSISPROPOSED．BYESTABLISHINGTHEGREYMODEL，THECHANNELSTATEINFORMATIONOFTHEPREVIOUSTIMESLOTISUTILIZEDTODYNAMICALLYPREDICTTHEUNKNOWNCHANNELSTATEINFORMATIONOFTHESUBSEQUENTTIMESLOT．THEFEASIBILITYOFGREYMODELINGAPPLIEDFORESTIMATINGTHECHANNELCHARACTERIZEDBY2一DTIMEFREQUENCYVARIABLESISVERIFIEDBYBOTHTHEORETICALANALYSISANDSIMULATIONS．COMPAREDWITHCONVENTIONALCHANNELESTIMATIONAPPROACHES，THEPROPOSEDALGORITHMNOTONLYPERFORMSWELLINNARROWBANDSLOWFADINGTIMEVARYINGCHANNELS，BUTALSOHASLOWCOMPLEXITYANDEASEOFREALIZATION．

簡(jiǎn)介：蘆明尸明本人鄭重聲明所呈交的學(xué)位論文，是本人在指導(dǎo)教師的指導(dǎo)下，獨(dú)立進(jìn)行研究所取得的成果。除文中已經(jīng)注明引用的內(nèi)容外，本論文不包含其他個(gè)人或集體己經(jīng)發(fā)表或撰寫過(guò)的科研成果。對(duì)本文的研究做出重要貢獻(xiàn)的個(gè)人和集體，均己在文中以明確方式標(biāo)明。本聲明的法律責(zé)任由本人承}日。論文作者簽名駐紐J關(guān)于學(xué)位論文使用權(quán)的說(shuō)明本人完全了解太原理工大學(xué)有關(guān)保管、使用學(xué)位論文的規(guī)定，其中包括①學(xué)校有權(quán)保管、并向有關(guān)部門送交學(xué)位論文的原件與復(fù)印件；②學(xué)校可以采用影印、縮印或其它子復(fù)制手段復(fù)制并保存學(xué)位論文；③學(xué)?？稍试S學(xué)位論文被查閱或借閱；④學(xué)?？梢詫W(xué)術(shù)交流為目的，復(fù)制贈(zèng)送和交換學(xué)位論文；⑤學(xué)?？梢怨紝W(xué)位論文的全部或部分內(nèi)容保密學(xué)位論文在解密后遵守此規(guī)定。簽名業(yè)N導(dǎo)師簽名如12。．1|趁絲么』日期五酪笸U太原理L人學(xué)碩士研究生學(xué)位論文802．16E移動(dòng)切換系統(tǒng)的設(shè)計(jì)與算法仿真摘要目前，無(wú)線網(wǎng)絡(luò)已經(jīng)廣泛的應(yīng)用到社會(huì)的各個(gè)方面，并正在向可移動(dòng)、高寬帶的方向發(fā)展。以802116E標(biāo)準(zhǔn)為基礎(chǔ)的無(wú)線城域網(wǎng)技術(shù)WIMAX以其高帶寬、可移動(dòng)等特點(diǎn)引起關(guān)注，并迅速得到了認(rèn)可。該標(biāo)準(zhǔn)在之前版本的基礎(chǔ)上添加可移動(dòng)特性，從而成為現(xiàn)在3G技術(shù)的有力競(jìng)爭(zhēng)對(duì)手。WIMAX技術(shù)能夠提供比WIFI更廣的覆蓋范圍、更高的傳輸速率，可以作為現(xiàn)有通信技術(shù)的補(bǔ)充解決最后一公里的無(wú)線接入問(wèn)題，也可單獨(dú)組網(wǎng)為使用者提供電信級(jí)通信網(wǎng)絡(luò)。802．16E標(biāo)準(zhǔn)最顯著特點(diǎn)是可移動(dòng)性，而移動(dòng)性管理中最主要的部分為切換機(jī)制，所以移動(dòng)切換機(jī)制的好壞直接決定無(wú)線網(wǎng)絡(luò)穩(wěn)定性和提供服務(wù)的質(zhì)量?jī)?yōu)劣。因此本文主要對(duì)802．16E協(xié)議中的切換進(jìn)行深入研究，主要完成工作如下1詳細(xì)了解802．16E協(xié)議切換技術(shù)的研究背景、協(xié)議框架結(jié)構(gòu)以及工作模式，掌握該協(xié)議的關(guān)鍵技術(shù)，通過(guò)對(duì)比闡明該標(biāo)準(zhǔn)的技術(shù)優(yōu)勢(shì)。2介紹了802．16E支持切換功能的網(wǎng)絡(luò)模型以及組件，重點(diǎn)分析了兩類不同的切換，分別為軟切換和硬切換。軟切換是一種平滑、無(wú)間斷的切換方式，其切換效果好但浪費(fèi)網(wǎng)絡(luò)資源；硬切換則是中斷后再連接的切換方式，能充分利用無(wú)線資源，但切換效果相對(duì)較差。在對(duì)網(wǎng)絡(luò)質(zhì)量要求不苛刻的環(huán)境下，硬切換是比較好的選擇。

簡(jiǎn)介：電子科技大學(xué)UNIVERSITYOFELECTRONICSCIENCEANDTECHNOLOGYOFCHINA專業(yè)學(xué)位碩士學(xué)位論文MASTERTHESISFORPROFESSIONALDEGREE論文題目725KV真空滅弧室仿真與研究專業(yè)學(xué)位類別工程碩士學(xué)號(hào)201192040508作者姓名何躍指導(dǎo)教師黃桃副教授THERESEARCHANDSIMULATIONOF725KVVACUUMINTERRUPTERAMASTERTHESISSUBMITTEDTOUNIVERSITYOFELECTRONICSCIENCEANDTECHNOLOGYOFCHINAMAJORMASTEROFENGINEERINGAUTHORHEYUESUPERVISORHUANGTAOSCHOOLSCHOOLOFPHYSICALELECTRONICS

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簡(jiǎn)介：上海交通大學(xué)碩士學(xué)位論文80211N無(wú)線局域網(wǎng)射頻收發(fā)器的系統(tǒng)級(jí)建模及仿真姓名楊旭申請(qǐng)學(xué)位級(jí)別碩士專業(yè)軟件工程指導(dǎo)教師周健軍20071101上海交通大學(xué)全日制日工程碩士學(xué)位論文80211N無(wú)線局域網(wǎng)射頻收發(fā)器的系統(tǒng)級(jí)建模及仿真280211NWLANRADIOFREQUENCYTRANSCEIVERSYSTEMLEVELMODULINGANDSIMULATION80211NWLANRADIOFREQUENCYTRANSCEIVERSYSTEMLEVELMODULINGANDSIMULATIONABSTRACTABSTRACTWHILECOMPUTERSANDCOMMUNICATIONTECHNOLOGYAREEXPLODING,WIRELESSLOCALAREANETWORKSAREPREVAILINGINCREASINGLYINPERSONALANDCOMMERCIALCOMPUTERFIELDWLANAREEVOLVINGTOWARDUSINGHIGHERFREQUENCIES,WIDERBANDWIDTHANDMOREFUNCTIONALITYTOSATISFYGROWINGDEMANDSOFUSERSWORLDWIDEIEEE80211A/B/GISONEOFBESTWIRELESSPROTOCOLSTANDARD,BUTITDOESN’TMEETTHENEEDOFWIRELESSGROWINGCOMMUNICATIONIEEE80211NSTANDARDISTHENEWSUBSTITUTEOF80211GITWORKSINTHEHIGHERTRANSPORTSPEED,MORECOVEREDAREA,ISCOMPATIBLETO80211A/B/GWITHHIGHEROPERATIONFREQUENCYANDMORECOMPLEXPROTOCOL,RFFRONTENDDESIGNISN’TINDEPENDENTFROMDIGITALBASEBANDTOOLSOFACCESSORIALCOMPUTERANALYSISANDSYNTHESISCOULDN’TMEETCOSIMULATIONOFDIGITALANDRFSOWENEEDDEVELOPMODELINGANDSIMULATIONOFRFCIRCUIT’SSYSTEMLEVELDESIGNINTHISPAPERWEUSEMATLAB/SIMULINKTOMODELINGANDSIMULATINGRFFRONTENDCIRCUITBASEON80211NANDESTABLISHENVIRONMENTOFDIGITALANDRFCOSIMULATIONINTHISPAPERTHEMAINWORKISDONEASFOLLOWINGFIRST,THESTANDARDOFWLANISINTRODUCED,ANDTHEGENERALRFCIRCUITDESIGNTHEORIESANDMETHODSAREDISCUSSEDTHEN,WEDISCUSSTHEKEYPOINTSONRFSYSTEMDESIGNANDSIMULATESEPARATELYLINKBUDGETCALCULATIONOFTHETRANSCEIVERRFSYSTEM,GETTINGCIRCUITSYSTEMINACCORDWITHTHESTANDARDLAST,WEMODELBUILDINGBLOCKANDSIMULATETHEWHOLESYSTEMINCLUDINGDIGITALBASEBANDANDRFSECTIONTHERESULTSINDICATETHATOURDESIGNACCORDSWITH80211NPROTOCOLRFCRITERIONKEYWORDS80211N,RFTRANSCEIVER,SYSTEMLEVELMODELING,SIMULATION