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1、H.Nietal.:ATDOALocationSchemeinOFDMBasedWMANs1017ATDOALocationSchemeinOFDMBasedWMANsHaoNi,GuangliangRen,Member,IEEE,andYilinChangAbstract—Atimedifferenceofarrival(TDOA)locationwouldbelimitedbythesamplingintervalasin[3]and[4],schemefortheorthogonalfrequencyd
2、ivisionmultiplexingjustlikeintheCDMAnetworks.Thereasonisthatthe(OFDM)basedwirelessmetropolitanareanetworks(WMANs)propertiesoftheOFDMsignalsinthefrequencydomainareispresented.AnovelTDOAestimationalgorithmforOFDMignoredinthesealgorithms.SomepropertiesoftheOFD
3、Msignalsisproposedandadoptedinthisscheme.Thealgorithmsignalsinbothtimeandfrequencydomainsareutilizedintheenhancesthelocationperformancebyutilizingtheinformationsuper-resolutionalgorithms,e.g.theMLalgorithm[5]andtheinthetimeandfrequencydomainsobtainedfromthe
4、receivedMUSICalgorithm[6].However,thesuper-resolutionlocationOFDMsignals.Thesimulationsareimplementedwithestimationsareembarrassedwithhighcomplexityandsomean802.16econfigurationconsideringanoutdoorwirelessneedsforprioriknowledge,albeittheirimpressiveprecisi
5、ons.scenario.ThesimulationresultsshowthattheschemecanmeetAdditionally,duetotheircomplexitythesuper-resolutiontheE911requirementsinevencomplexmultipathchannelestimationscanonlybeusedinlocationprocedureswithshortconditions,andoutperformthelocationschemeswith1
6、distancesbetweenthetransmittersandthereceiversintraditionalcorrelationdetectionTDOAestimations.practicalsystems.Inthisschemeanovelsuper-resolutionTDOAestimationIndexTerms—Orthogonalfrequencydivisionmultiplexing(OFDM),locationbasedservices(LBS),WirelessMetro
7、politanalgorithmwithlowcomplexityisemployedbasedontheAreaNetworks(WMANs),TDOAestimation.presentedsignalmodel.ThenetworkbasedarchitecturesofthelocationschemesimplifytheprocedureattheMTs,I.INTRODUCTIONbringingminimumadditionalcosttotheusers.Locationschemeshav
8、ebeenadoptedintheavailablewirelessnetworkstoimplementthepromisinglocationbasedII.SYSTEMDESCRIPTIONANDSIGNALservices(LBS).Amongtheschemes,asthoseemployedintheMODELING3GPPand3GPP2specifications[1],[2],th
