CDMA2000 1xEV-DO移動終端基帶接收技術的研究與QCELP13K聲碼器定點化DSP實現(xiàn).pdf

1、Y791571分類弓：!型皇2皇：!!乙DC6213面級：公Zt學號：Q2塑東南大’學碩士學位論文CDMA2000IxEVDO移動終端基帶接收技術的研究與QCELPl3K聲碼器定點化DSP實現(xiàn)研究生姓名：鯉蟹導師姓名：趙查明麴撞王玲副夔攮中請學何級別亟學科專業(yè)名稱適籃生信，墾系統(tǒng)論文提使門期!!!!生!趔淪文答辯1j11]呈螋笙i旦一，學化授rJ中值丕I塑。厶堂學位授予≯J!!至U答辯套!會1席昊／‘：臼彳’驢F『蒯八答辯蠶!會1席天”

2、。l驢F『蒯八零零五年J甲彳t8t甚東jtji譬：it：‘警’忙：t疋ABSTRACTCDMA2000IxEV—DOsystem1sanenhancedversionofIS95AandCDMA2000—1XItinheritsthebasicfrequencyspreadingcommunicationtechnologyofCDMA，andaswelladoptsthekeytechnologyofHDRmcthodtooptimi

3、zeforwardlink，Thehighesttransmitrateis24MbpsThisthesismainlyfocusesontheRAKEreceivingusedinforwardlinkoflxEVDOsystemInchapter1，wefirstlyintroducethehistoryanddevelopmentof1xEVDOsystemThenweintroducethesuperiorityof1xEVDO

4、systemWebeginchapter2byintroducingthekeytechnologyandstructureofIxEVDOsystemChapter2alsointroducesthephysicallayerprotocoloflxEVDOsystemChapter3firstlyshowsboththecharacteristicsandmathem撕cmoduleoflandmobilechannelAftert

5、hat，aMCCDMARAKEreceiverstructureispresentedChapter4firstlyshowsasimulateplatformofforwardlinkBaseonit，weintroduceanalgorithmofsoftdemodulateusedin16QAMBymeansofcomputersimulation，r日formanceofWMSAwitllfixedobservationleng

6、thisshownThechapterdiscussesanalgorithmthatusetheDopplershiftestimatetodynamicallyadjustobservationlengthandparametersinordertoobtainsthebetterperformanceinvariantvelocitiesAtlastweuseRAchanneltoassistchannelestimationan

7、duselineinterpolatetoincreaseprecisionofchannelestimationinhi曲speedInthelastchapterwediscusstherealizationofQeelpl3kcodecinfixedpointDSPchipAtfirst，thefundamentalofCELPMgorithmisintroducedSecondly，primarymoduleofQcelpl3k

8、codecalgorithmisgivenThenwedeveloptheQcelpl3ktealizeincommercialmobilephoneFinally，weshowtherealizationprocessofQeelpl3karithmeticinfixedpointDSPchipandbythetest，itcanmeettherequirementsofcommercialCDMAsystem[KeyWords]CD