ieee802.11ac协议与宽带mimo-ofdm技术的分析

ieee802.11ac协议与宽带mimo-ofdm技术的分析

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时间:2019-01-30

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1、ABSTRACTWiththedemandforhigh—speedwirelessInternetaccess,IEEEcommitteehasbeguntodevelopanewversionofthewirelessLANstandardnamedIEEE802.1lac.ThisstandardisnotonlyfullycompatiblewiththeIEEES02.1lnstandardwhichhasthehi曲estavailabletransmissionrateanditsupportsthemax

2、imumtransferrateupto1Gbps.AstheotherstandardsofWLANseries,IEEES02.1lacstandardfocusesonthephysicallayerandMAClayertransmissiontechnologyaccesstechnology.Inthephysicallayer,itisthefirsttimethat802.1lacstandardbringthemulti—userMIMOtechnologyintotheWLANsystem.Witht

3、histechnology,802.1lacsimultaneouslytransmitdatatOmorethanoneuseratthesametime.802.1lacsystemsupports2.4GHzand5GHzwithmanydifferentbandwidthandincreasesthemaximummodulationandcodingrate,whichgreatlyimprovedphysicallayertransmissionrate.Inordertosupportthemulti—us

4、erMIMOtechnologiesofthephysicallayer,802.1lacprovidesusersgroupschedulinganduserchannelfeedbackmechanismintheMAClayer.ThekeyofPhysicallayermulti--userMIMOtechnologyismulti--userprecedingusingtheuser'schannelinformation.Theprecedingmethoddirectlyaffectsthemutualin

5、terferencebetweenusers.IEEE802.1lacsystemonlysupportalimitedchannelinformationfeedback,therefore,howtodesignaprecedingmethodwiththelimitedchannelinformationistheactualproblemtobesolved.Bothprecedingdesignmethodologyanduserthecorrelationofchannelinformationeffectp

6、erformanceofMulti-USerpreceding.Consideringusergroupstrategyinthestandard,selectingtheappropriateusersforprecedingCanimprovethepre—codingperformance,whichincreasethesystemtransmissionrate.Inthispaper,themainresearchworkareasfollows:1.ThesecondchapterfocusonIEEE80

7、2.1lacindoorwirelesschannelmodel.consideringthewiderchannelbandwidthandmulti-user,physicallayersynchronizationispresentbasedonstandardphysicallayerpreamblesequence.2.somecommonsingle-userMIMOtechnologiesispresentinchapterthree,includingspace-timecodingandsingle—u

8、serbeamforming.3.Thechapterthreealsofocusonthecompressedchannelfeedbackmechanismsofthestandard.Linkadaptationtechniquesandreversedirectionprotocolimprovementsa

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