WCDMA系統(tǒng)中的高速數(shù)據(jù)無線接入技術(shù)研究.pdf

1、##n#：三堂分類號：!墮絲!皇單位代碼—』蝗!!一≈‰——商主卸曉蕓建碩士學(xué)位論文論文題目：里!里堅壘丕笙主塑壺墮塑堡無線接人技術(shù)研究學(xué)生姓名學(xué)號指導(dǎo)學(xué)科教師專業(yè)研究方金卓琳傅海陽教授通信與信息系統(tǒng)向移動通信與無線技術(shù)論文提交日期二00叢生嬰旦南京郵電大學(xué)碩。E研究生學(xué)位論文AbstractAbstractAnalogcellularsystemsarecommonlyreferredtoasthefirstgenerationsys

2、tems(1G)Thedigitalsystemscurrentlyinuse，suchasGSM(GlobalSystemforMobileCommunications)，PDC(PersonalDigitalCellular)andcdmaOne(IS一95)，arethesecondgenerationsystems(2G)Asthesesystemshaveenabledvoicecommunicationstogowirele

3、ss，thethirdgenerationsystems(3G)shouldbedesignedforwirelessIntemetandmultimediatrafficTheminimumrequirementsfor3Gstandardsaletoprovideradioaccessdataratesof144kbit／sforvehicularhighspeedtraffic，384kbit／sforpedestriantraf

4、fic，2Mbit／sforindoortrafficTherealefour3Gmainstandards：WCDMA，cdma2000lx，TDSCDMA，aswellasWiMAX，thefirstthreeofwhicharebasedonCDMAmodeInordertoimprovetheradioaccessdataratesofGSMsystem，fourtechnologies，whichareGPRS，EDGE，WC

5、DMAandHSDPA，appearsequentiallyintheevolutionfromGSMto3GInthispapertheperformanceofthesetechnologiesisanalyzedTherearelargedifferencesbetweentherealdataratesandtheirallegeddataratesandlessascendingspaceofdataratesintheses

6、ystemsAsthispaperputsemphasisonWCDMA，itsperformanceisdiscussedinmoveaspectssuchasradiolinkbudget，coverageradiusandcellcapacityBasedonthecarefulstudyofdifferentkindsofmulti—ratesystems，thispaperprovesthatTDMAismovesuitabl

7、eforthetransmissionofhighdataratesthanCDMATherefore，atlastthispaperproposesamelioratedWCDMAschemebycombiningCDMAtechniquewithTDMAInthisschemescramblingcodesareusedtoseparatevoicetrafficchannelsfromhighratedatatrafficchan

8、nelsinthedownlink，whileCDMAandTDMAmodeareemployedinvoiceandhigh—ratedatatrafficchannelsrespectivelyThisschemecouldnotonlyimprovetheaccessdataratesofdownlinkgreatlytomeettherequirementsofwirelessIntemetbutalsaisethespectr