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WirelessCommunicationsPrinciples(bilingualcourse)
(No:B0205061S)
Lecture1:IntroductiontoWirelessCommunications
ylshi@
(Feb,2014-Apr.2014)5/22/20231CourseInformation32classhoursinallExaminationpaperisinEnglishReferencebooks: 1)TheodoreS.Rappaport.WirelessCommunicationsPrinciplesandPractice(2ndEdition).電子工業(yè)出版社,2009年版 2)TheodoreS.Rappaport著,周文安等譯.無線通信原理與應(yīng)用.電子工業(yè)出版社,2011年版3)張業(yè)榮,竺南直,陳勇.蜂窩移動通信網(wǎng)絡(luò)規(guī)劃與優(yōu)化.北京:電子工業(yè)出版社,2003
5/22/20232Maincontentsinthecoursewithin32hoursIntroductiontoWirelessCommunications(ch.1,ch.2,selectedch11)TheCellularConcept:SystemDesignFundamentals(ch.3)MobileRadioPropagation:Large-ScalePathLoss(ch.4)MobileRadioPropagation:Small-ScaleFadingandMultipath(ch.5)MultipleAccessTechniquesforWirelessCommunications(ch.9)WirelessNetworking(ch.10,selected)5/22/20233Wirelesscommunication:thetransferofinformationoveradistancewithouttheuseofelectricalconductorsor"wires".CommunicationviacomputersthatreliesonradiosignalsTheequationrelatedtothespeedoflight:Thespeedoflight;
carrierfrequency;
wavelength;1.1 Adefinitionofwirelesscommunication5/22/20234Cellphonesoperateinthisfrequencyrange,UHF=UltraHighFrequency(notethelogarithmicscale,generallynear2GHz)CellularNetworkBasics:
FrequencyRange5/22/20235GeneralResearchAreas:CellularSystems(wirelesswideareanetworksorWWANs)SatelliteSystems(skip)wirelesslocalareanetworks(WLANs)wirelessmetropolitanareanetworks(WMANs)WirelessPersonalAreaNetworks(WPANs)1.2 CurrentWirelessSystems5/22/20236Classificationofwirelessnetworks
(ReferredtoKaustubhPhases,UPPSALAUni.)
5/22/20237
EmergingResearchAreasandTechniques
EmergingAreasWirelessSensorNetworks3Gandbeyond3.9G(LTE),4G,etalWirelessKeytechniquesOFDM,andMulti-carrierMIMO(Multi-InputMulti-Output)CognitiveandSoftwareDefinedRadio,
IEEE802.22(proposed),etal
Coverage(range)Area,…
TheoutputofWirelessSystemModelingandDesign:Internationalstandard(IP):802.11,802.16,GSM…
5/22/202385/22/2023AllIPbased5/22/20239
WirelessCommunicationsSystemDefinitions
(pp:10)
BaseStation
Controlchannel:initiating,requesting,orpagingacallForwardchannel:fromBStothemobile(alsoSubscriber)Reversechannel:fromthemobiletoBSHalf-duplexsystemsallowingtwo-waycommunicationbyusingthesameradiochannelFull-duplexsystemsallowingsimultaneoustwo-waycommunication.HandoffMobilestationMSC:MobileSwitchingCenterSimplexsystemandetal.5/22/202310ThebigbreakthroughcamewhenAT&TLabsresearchersdividedwirelesscommunicationsintoaseriesofcells.HighcapacitywithlimitedradiospectrumGoal:IncreasecapacitywhileminimizinginterferenceKey:FrequencyReuse
(uselowerpowertransmitterspercellandshrinkcellsize,sothatfrequenciescanbereusedmoreoften)TheCellularConcept5/22/2023115/22/202312TheproposalofcellularconceptBASESTATION5/22/202312WWANscoversacountry;typicallyinterconnectingseveralWMANsandprovidinganywhere,anytimeaccess
ItisusefultothinkofcellularNetwork/telephonyintermsofgenerations:1G:Analogcellulartelephony;2G:Digitalcellulartelephony;3G:High-speeddigitalcellulartelephony(includingvideotelephony);4G…Firstgeneration(1G)ofcellularNetworksAnalogcellularsystems(FM)OnlycarryvoicetrafficLesssecureandpronetointerferencewhensignalisweakIncludestandardssuchas:AMPS30KHzFMFDMA1.3Mobilecommunicationnetworks
5/22/202313The2ndgenerationofmobiletechnologyOr
2GCellularNetworksGSMwasthemostappliedtechnology
ofCellularnetworksDigitalcellularsystemscanSupporthighbitratevoice,limiteddatacommunicationImprovequalityofservice2Gstandardsinclude:
GSM200KHzGMSKTDMA(Byfarthedominantoneinchina)IS-951.23MHz,CDMA,signalbandwidthofasinglechannelis1.28MHz5/22/202314
3GOffersenhancementstocurrentapplicationsincludinggreaterdataspeeds,increasedcapacityforvoiceanddataandabroaderrangeofservices.In2000,ITUapprovedthefollowingthreestandards:cdma2000WCDMATD-SCDMA
Inaddition,WIMAX(OFDM/OFDMA)wasincludedin2007.Highestdatarateof3Gisasfollowingatleast144Kb/sinavehicularenvironment,384Kb/sinapedestrianenvironment,2048Kb/sinanindoorofficeenvironment.3G(The3rdgenerationwirelessnetwork)
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