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1、原文：WirelessInfraredCommunicationsI.IntroductionWirelessinfraredcommunicationsreferstotheuseoffree-spacepropagationoflightwavesinthenearinfraredbandasatransmissionmediumforcommunication(1-3),asshowninFigure1.Thecommunicationcanbebetweenoneportablecommunicationdevi
2、ceandanotherorbetweenaportabledeviceandatethereddevice,calledanaccesspointorbasestation.Typicalportabledevicesincludelaptopcomputers,personaldigitalassistants,andportabletelephones,whilethebasestationsareusuallyconnectedtoacomputerwithothernetworkedconnections.Al
3、thoughinfraredlightisusuallyusedotherregionsoftheopticalspectrumcanbeused(sothetermwirelessopticalcommunications"insteadofwirelessinfraredcommunications"issometimesused).Wirelessinfraredcommunicationsystemscanbecharacterizedbytheapplicationforwhichtheyaredesigned
4、orbythelinktype,asdescribedbelow.A.ApplicationsTheprimarycommercialapplicationsareasfollows:²short-termcable-lessconnectivityforinformationexchange(businesscards,schedules,filesharing)betweentwousers.TheprimaryexampleisIrDAsystems(seeSection4).²wirelesslocalarean
5、etworks(WLANs)providenetworkconnectivityinsidebuildings.ThiscaneitherbeanextensionofexistingLANstofacilitatemobility,ortoestablish“adhoc”networkswherethereisnoLAN.TheprimaryexampleistheIEEE802.11standard(seeSection4).²building-to-buildingconnectionsforhigh-speedn
6、etworkaccessormetropolitan-orcampus-areanet-works.²wirelessinputandcontroldevices,suchaswirelessmice,remotecontrols,wirelessgamecontrollers,andremoteelectronickeys.B.LinkTypeAnotherimportantwaytocharacterizeawirelessinfraredcommunicationsystemisbythe“linktype”whi
7、chmeansthetypicalorrequiredarrangementofreceiverandtransmitter.Figure2depictsthetwomostcommonconfigurations:thepoint-to-pointsystemandthediffusesystem.Thesimplestlinktypeisthepoint-to-pointsystem.There,thetransmitterandreceivermustbepointedateachothertoestablisha
8、link.Theline-of-sight(LOS)pathfromthetransmittertothereceivermustbeclearofobstructions,andmostofthetransmittedlightisdirectedtowardthereceiver.Hence,point-to-p
