PHS系統(tǒng)中的數字波束成形技術及實現方法研究.pdf

1、Y767080分類號：UDC密級：編號：0219402022咿幽撼嚳碩士學位論文PHS系統(tǒng)中的數字波束成形技術及實現方法研究學位申請人：奎盎拄導師姓名及職稱專業(yè)名稱周淵平截授通信與信息系統(tǒng)二OO五年四月=十七日D適italBeamformerandItsImplementationinPHSWirelessCommunicationSystemMajor：CommunicationandInformationSystemName：LIW

2、ereSupervisor：ProfZHOUYuanpingABSTRACTPHSwirelesscommunicationsystemshavebeenwidelyusedinChinasinceseveralyearsagoduetoitslowcost，lowradition，lowbetteryconsumption，andeteAPHShandsetissimpleinhardwaredesignandlightinweigh

3、t，usnallywithalow阻iceItstransmitpowerisaslowasafewpercentofthatofaGSMmobilephone，andGreenPhoneisthereforenamedforitslowradiationHowevertherearealsosomedisadvantagesassociatedwithPHSsystems。Thetransmitpowerofthebasestatio

4、nisSOlowthatitcanonlycoverasmallserviceareaInaregionwithheavyloads，alargenumberofbasestationsarerequiredtoinsurethesignalcoverage，makingthenetworkconstructionadifficultoneDigitalbeanfformingtechnologyrealizesspatialfilte

5、ringthrougharraysignalprocessingthatgeneratesamaximumgaininthedirectionofdesiredsignalandnullsininterferencedirectionsIncomparisontoareceiverwithallomni—directionalantenna，abeamformingreceiverattainsahighersensitivityani

6、ncreasedsignaltointerferenceplusnoiseratio，andallextendedservicerangewiththesametransmitpowerThisthesisfirstgivesadescriptiononPHSsystemThenitintroducestheprincipleofadaptivebeamformingtechnologyandseveraladaptivea蜘rithm

7、sarediscussedInparticulartheimplementationofadaptivebeamformerusinghighspeeddigitalsignalprocessorsisdeseripedindetailsTwomajorDSPprocessorsforwkelesscommunications，TigerSHARCAIXSPTS201ofAnalogDevicesandTMS320C6416ofTexa

8、sInstruments，arestudiedandcomparedAbeamformingsystemrealizedbyTMS320C6416processorsissetuptoimplementadaptivebeamformingalgorithmsFinallytheadaptivebeamformeristestedwiththerealPHSsignalscollectedinfieldbyXi’anHaitianAnt