南邮无线通信原理第一章.ppt

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1、CourseIntroduction7/28/20211WirelessCommunicationsPrinciples32classhoursinallExaminationpaperisinEnglishReferencebooks7/28/20212ContentsIntroductiontoWirelessCommunicationSystems(ch.1,ch.2)TheCellularConcept:SystemDesignFundamentals(ch.3)MobileRadioPropagation:Large-ScalePathLoss(

2、ch.4)MobileRadioPropagation:Small-ScaleFadingandMultipath(ch.5)MultipleAccessTechniquesforWirelessCommunications(ch.9)7/28/20213IntroductiontoWirelessCommunicationSystems7/28/20214WhatiswirelesscommunicationAnyformofcommunicationthatdoesnotrequirethetransmitterandreceivertobeinphy

3、sicalcontactElectromagneticwavepropagatedthroughfree-spaceShortwave,Microwave,IR,Optical7/28/20215Lightofsightpropagation;Skywavepropagation;Groundwavepropagation.Themodeofpropagationofelectromagneticwaves7/28/20216Ataglanceofthehistory1894-96FirstTransmitter–FirstPatent1897World’

4、sFirstWirelessTelegraph&SignalCompany1901Telegraphacrosstheatlanticocean1899-1912SavingLives1920Discoveryofshortwave(<100m)GuglielmoMarconi7/28/20217"Thosewhohadbeensaved,hadbeensavedthroughoneman,Mr.Marconi...andhismarvellousinvention"Titanic7/28/20218Historyofwirelesscommunicati

5、on1920’s:Radiobroadcastingbecamepopular1920’s:MobilereceiversinstalledinpolicecarsinDetroit1928:manyTVbroadcasttrials1930’s:TVbroadcastingdevelopment1950’s:Communicationssatelliteslaunched1960’s:BellLabsdevelopedcellularconceptLate1970’s:technologyadvancesenableaffordablecellulart

6、elephone1974-1978:Firstfieldtrialforcellularsystem7/28/20219CellularSystemsSatelliteSystemsWirelessLANWirelessMANWirelessPANCurrentWirelessSystems7/28/202110WirelessCommunicationsSystemDefinitions(p10)Controlchannel:vitalforinitiating,requesting,orpagingacallTrafficchannel(voicech

7、annel):dedicatedtocarryingrevenue-generatingtraffic.SimplexHalf-duplexCommunicationsystemswhichallowtwo-waycommunicationbyusingthesameradiochannelFull-duplexCommunicationsystemswhichallowsimultaneoustwo-waycommunication.FDDTDDisonlypossiblewithdigitaltransmissionformatsanddigitalm

8、odulation,andisverysensitivetotim