寬帶移動通信系統(tǒng)中信道估計與接收機技術(shù)研究.pdf

1、東南大學博士學位論文寬帶移動通信系統(tǒng)中信道估計與接收機技術(shù)研究姓名：董霄劍申請學位級別：博士專業(yè)：通信與信息系統(tǒng)指導教師：尤肖虎20010301東南大學博士學位論文AbstractCDMAhasreceivedsignificantattentionforitsattractivefeatures，suchashighspectrumefficiencysimplifiedfrequencyplanning，softhand—offan

2、dmacro—diversityandisbecomingmainstreamin3rdgenerationmobilecommunicationsystemsThekerneltechniquesinvolvedintheCDMAbasedsystemshavebeenconsideredanddevelopedextensivelyinresearchAmongthem，thechannelestimationandreceiver

3、techniquesarethefocusofthisdissertationThemethodsofchannelestimationwiththeassistanceoftime—multiplexedpilotsymbolsareinvestigatedandanewmethod(SOLSMWSOLSM)anditscorrespondingslotpattemisproposedThepresentedmethodemploys

4、interpolationonasecond—ordercurveusingtheinstantaneouschannelestimationoftwoconsecutiveslotsbasedonleastsquaremethodSimulationresultsshowthatiteffectivelyimprovestheperformanceoftheRAKEreceiverathighvehicularspeedsAdditi

5、onallythemethodsofchannelestimationwiththeaidofcontinuouspilotchannelarereviewedandanovelmethodofestimatingmaximumDopplerfrequencyoffadingchannelsisprovidedAlso，theclosedformofoptimalintervaloftheaveragingbasedchannelest

6、imationinfrequencydomainispresented，whichsuggestsaschemeofchannelestimationoveradaptiveaveragingintervalItimprovestheperformanceofchannelestimationandprovidesconsiderablegainatreceiverwithawiderangeofmobilespeedsFurtherm

7、ore，thereceivingtechniquesofmulticarrierCDMAsystemsbasedoncdma2000—3Xareexploredandauniquereceiveremployingzero—interfrequencytechnologyispresentedItiszeroIFtechnologythatobviatestheneedofbanksofhj曲eanalogbandpassfilters

8、andenablessamplingatthetheoreticallylowestrate4timesofthemulticarrierfrequencyspaceWiththecompleximpulseresponsecoefficientFIRfiltersproposed，thezero—IFdigitalreceiverhasthewell—knownstructureofmodulatedfilter—banksAllth