《移动通信技术（英文）》课件-什么是移动通信

WhatisMobileCommunicationMobileCommunicationTechnology01020304DefinitionofMobileCommunicationDevelopmentofMobileCommunicationClassificationofMobileCommunicationWorkWayofMobileCommunicationCONTENT01DefinitionofMobileCommunicationPARTONEGoalanddrivingforce5W

WhereeverwhoeverWheneverCommunicationTarget5W5W：communicatewithanotherpersonanytimeandanywhere

Mobilecommunicationreferstothewayinwhichoneorbothpartiesofcommunicationtransferandexchangeinformationinamobilestateortemporarilystayatanunscheduledlocation.Definitionofmobilecommunication02DevelopmentofMobileCommunicationPARTTWODevelopmentofMobileCommunication1GCellularnetworkingtechnologyisadopted.Themainanalogcellularmobilecommunicationsystemsare:

(1)AMPSinNorthAmerica.

(2)NMT-450/900innorthernEurope.

(3)TACSintheUK.Features:FDMA,analogmodulation,voiceservice.2GInthe1990s,amobilephonesystembasedondigitaltransmission,timedivisionmultipleaccessandnarrowbandcodedivisionmultipleaccesswasdeveloped,whichiscalledthesecondgenerationmobilephonesystem.Representativeproductsaredividedintotwocategories:TDMAsystemN-CDMAsystem2GThemorematureandrepresentativestandardsinTDMAsystemare:Pan-EuropeanGSM(GlobalsystemforMobileCommunications)AmericanD-AMPS(DigitalAMPS)JapanPDC(personaldigitalcellularphone)ThemainstandardsofN-CDMAsystemare:N-CDMAbasedonIS-95(narrowbandCDMA)ledbyQualcommtrytosummarizethecharacteristicsof2Gfromtheaspectsofmultipleaccessmode,signaltypeandsoon.3G--IMT2000

Thetheoreticalresearch,technologydevelopmentandstandardformulationofthethirdgenerationmobilecommunicationtechnology(3G)beganinthemid-1980s,andtheInternationalTelecommunicationUnion(ITU)officiallynamedthesystemIMT-2000(InternationalMobileCommunications2000).

TheEuropeanTelecommunicationsStandardsAssociation((ETSI))callsitUMTS(UniversalMobileCommunicationsystem).Theoutstandingfeatureof3Gsystemisthemultimediaofservice.

Thehighestserviceratecanreach2Mbps.pictureaudiovideo4G--LTE5G—IMT2020Threemajorapplicationscenarios:eMBBmMTCuRLLC

4Gchangeslife,while5Gwilldeeplytransformsociety!03ClassificationofMobileCommunicationPARTTHEREClassificationofMobileCommunicationCanyouclassifytheexistingmobilecommunicationsystems.①useobjectcivilmilitary②useenvironmentLandcommunicationAircommunicationSeacommunication③multipleaccessmodeFDMACDMATDMA④workingmodesimplexhalfduplexfull-duplex⑤signalformanalogsignaldigitalsignal04WorkingModeofMobileCommunicationPARTFOURWorkingModeofMobileCommunicationWorkingModesimplexfull-duplexhalf-duplexSimplexmeansthatthetransceiversofbothsidesofthecommunicationcannotbeintheworkingstateatthesametime,thatis,thetransceiverscannotbereceivedatthetimeoftransmissionandcannotbesentatthetimeoftransmission.

Whencommunicating,youmusttaketurnstochangethetransceiverstate.WorkingModeofMobileCommunicationtypicalapplications:walkie-talkiesWorkingModeofMobileCommunicationfull-duplex

referstobothsidesofthecommunication,thetransceiverisworkingatthesametime,thatis,wheneitherpartyisspeaking,thevoiceoftheotherpartycanbeheardatthesametime.WorkingModeofMobileCommunicationtypicalapplications:mobilephonesWorkingModeofMobileCommunication

SchematicdiagramofduplexmodeWorkingModeofMobileCommunicationFDDdistinguishesuplinkanddownlinkwithdifferentfrequencies,andtimedivisionduplexdividesuplinkanduplinktransmissionaccordingtodifferenttime.half-duplexmeansthatoneparty(suchasthebasestation)usesduplexmode,andthetransceiverworksatthesametime,andthetransceiverusestwodifferentfrequencies;ontheotherhand(suchasmobilestation),itusesdual-frequencysimplexmode,thatis,thecommunicationmodeinwhichthetransceiverworksalternately.

(Page24)Atypicalapplicationistaxiclusterdispatchingsystem.WorkingModeofMobileCommu