基于TDSCDMA网络的DOA估计及应用研究

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1、西南交通大学’研究生学位论文基于TD-SCDMA网络的DOA估计及应用研究年级二OO四级姓名李富民审请学位级别硕士专业指导教师通信与信息系统邓平教授二00七年五月西南交通大学硕士研究生学位论文第Ⅱ页AbstractTD．SCDMAnetworkadoptsthenewtechniquesofuplinksynchronizationandUniformCircularArray(UCA)smartantemla，SOtheservingbasestationcanobtaintheTimeofArrival(TOA)andDirection．Of-Arr

2、ival(DOA)ofmobileusers’signalsconveniently．BasedonthoseparameterswecallobtainthemobileUSeTS’positionbyonlyonebasestation．andthepreciseDOAestimationisthecrucialtechnique．However,thoseclassicalDOAestimationalgorithmsbasedonUniformLinearArrayCOLA)，SUchasMultipleSignalClassificationa

3、lgorithm(MUSIC)andEstimationofSignalParametersviaRotationalInvarianceTechniquealgorithm(ESPRIT)can’tbeusedinUCAdirectly,howtoapplytheseclassicalalgorithmstoUCAisaimportantresearchitenLBasedontheanalysistoresearchstatusofDOAestimationtechniques．wirelesslocationtechniquesandthechar

4、acteristicoftheTD-SCDMAnetworksubspace-basedDOAestimationanditsapplicationarcdeterminedtobethemainresearchiternint11isthesis．Inordertoestimatetheusers’signalDOAprecisely,firstlythisthesispaysmoreattentiontotheresearchoftwokindsofsubspace．basedalgorithmsknownasMUSICandESPRIT，besid

5、es．severalimprovementsuggestionstothesealgorithmsareproposed．AsMUSICalgorithmCan’tdistinguishtheDOAofhighlycorrelatedmultipathsignals，spatialsmoothingisusedtode—correlatethesignalsintheULA．butthespatialsmoothingtechniquesdon’tfittheUCA．InordertoapplyspatialsmoothingtechniquestoUC

6、4。腑convertthearraymanifoldfromUCAtovirtual删byPretreatmenttechniques．andproposethemode—spaceSSMUSlCalgorithmwhichCande-correlatethecorrelatedsignalsinUCA．Forsolvingthefluctuationofsignalsubspacecausedbynoise．twokindsofTLS-ESPRITareproposed．InordertoapplythoseESPRITalgorithmstoUCA．

7、themode-spacealgorithmsofUCAarcintroduced．Basedonpropermathematicmodel’theperformanceofthosealgorithmsissimulatedandcomparedindetail．Finally,basedonaboveresearch．theprojectofapplyingtheDOAestimationtoTD-scDMAlocationsystemsiSproposed．BasedOUthefoundationofproperchannelmodel。thelo

8、cationperformanceoftheprojectissimulated