無線局域網(wǎng)關(guān)鍵技術(shù)的研究基于ieee802.11b標(biāo)準(zhǔn)物理層信道均衡和信道估計技術(shù)的研究

1、東南大學(xué)碩士學(xué)位論文無線局域網(wǎng)關(guān)鍵技術(shù)的研究基于IEEE802.11b標(biāo)準(zhǔn)物理層信道均衡和信道估計技術(shù)的研究姓名：馬遷申請學(xué)位級別：碩士專業(yè)：信號與信息處理指導(dǎo)教師：胡愛群2002.3.10東南大學(xué)碩士學(xué)位論文AbstracIAbstractWirelesslocalareanetwork，akindofLANusingwirelessmedia，isaproductionofthecombinationofcomputertechno

2、logyandwirelesscommunicationteehnologyTheIEEE80211standardsetsstandardsforfunctionandservicemediaaccesscontrollayerphysicallayerpowermanagement，securityandauthenticationforwirelesslocalareanetworkThemainaimofthedissertat

3、ionistomakeresearchonthekeytechnologiesofWLANespeciallyonthe24GHzISMbandphysicallayertechnologyspecifiedbyIEEE8021lbstandardWjinvestigatethemodulation&demodulationmethodforcomplementarycodekeying(CCK)andimplementthemodul

4、ation&demodulationmoduleforPSKmodeBecausedifferentsymbolsusedifferentcodewordsinCCKboththenon—idealautoandcrosscorrelationpropertiesdeterioratemultipathresistanceAsaresult，channelequalizationisnecessarytoguaranteethehigh

5、ratelinkinamultipathenvironmentOperatingontheRAKEreceiverprincipletheCMFDFEschemeemployschannelmatchedfilter(CMF)anddecisionfeedbackequalizer(DFE)tocombatinterchipinterferenceandintersymbolinterferenceandthusprovidesfast

6、equalizerstartuDfortransmissionsoffranlesThemultipath—interference—cancelequalizationschemeuseshard—decisiononeachsampletocancelinterchipinterferenceandusesdetectedcodestoCanOelintersymbolinterferenceThentheschemeutilize

7、sRAKEreceivertocombinetheenergyofmultipathsignalcomponentsComputersimulationresultsshowthat，aimingtochannelswithdifferentcharacteristics，thetwoschemescanimprovethereceiverperformancewhilegreatlyreducethecomputationalcomp

8、lexityrespectivelyTheequalizationschemesarebasedonaccuratemultipathchannelknowledgeThereforeitiscrucialtoobtainaccuratechannelestimationintheCCKdetectorThemultistagemultipathinterferencecancellationcharmelestimationschem

9、eisbasedontheideathatchannelparameterscanbeextractedfromthemaximumcorrelatoroutputinwhichmultipathinterferenceiscancelledInducingthemultipathinterferencecancellationmodule也eschememakesaltemateuseofsymboldetectionandchann

10、elestimationinaniterativemannertoobtainaccuratechannelparametersThedissertationisorganizedasfollows：Inchapter1，theconceptstechnologyapplicationandhistoryofWLANisbrieflyintroducedInchapter2thedissertationgivesabriefdescri

11、ptionofIEEE80211standard，includingarchitecture，service，mediaaccesscontrollayerandphysicallayerAtierthehighratedirectsequencespreadspectrumsystemispresentedthemodulation&demodulationmethodandperformanceofCCKareputforwardi

12、nchapter3DetailedinvestigationandsimulationonthechannelequalizationandchannelestimationofCCKarediscussedInchapter4basedonEDAtechnologytheimplementationof1Mbiffsand2MbiffsPSKmodespreadspectrummoduleisdescribedInthefinalch