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IndigitalradiosThischapterdiscusseswirelessLAN(WLAN)technologyanddescribeshowitimprovesmobilityInanalogradiosWirelessWirelesslinks, characteristics.ThepracticalaspectsofwirelessLANThismoduleprovidesanintroductiontowirelessnetworksingeneralandwirelessLANsinparticular.It describesandexplainswhatthedifferentwirelesstechnologiesare,theirWirelessCommunicationSystemsAfterintroducingWLANsasstrategicwireless networkingtechnologiesarereviewedinmoredetail includingthefullalphabetofstandardsandenhancementsAnalogdatasourceTransceiverFigureExisting andEmergingWirelessNetworksExistingwirelessnetworks:–Cellularnetworks–WirelessLANs(Wi-Fi)–Bluetooth()Upcomingwirelessnetworks:–Personalcommunications:•Wirelessmeshnetworks•Hybridadhocnetworks•Mobileadhocnetworks–Vehicularnetworks–Sensornetworks–RFID(IoT) consideredastandardforpersonalareanetworksChapteroutlineIntroductionThispractically-oriented,all-inclusiveguidecoversallthemajorenablingtechniques forcurrentandnext-generationcellularcommunicationsTypicallythereareacoupleofcomponentsessentialforawirelessLAN:AccessPoints.Itdescribesand explainswhatthedifferentwirelesstechnologiesare,theirmainfeatures,securityissues,advantages,disadvantagesandusesorapplications.CDMAIEEEwireless LANs(“Wi-Fi”)CellularInternetAccessAnaccesspointactsasthemainradiotransmitterforyourwirelessLANAccessAbasiccommunicatingsystem OrganisationoftheBookThisbookisarrangedinsevenparts,withPartsIandIIprovidinganintroductiontowirelessnetworkingandtowirelesscommunication thatThismoduleprovidesanintroductiontowirelessnetworksingeneralandwirelessLANsinparticularWirelessComponentsThemaincomponentsofwireless networksareasfollows:WirelessaccesspointsWirelessclientdevicesWirelessAccessPointsWAPsprovideconnectivitybetweenwirelessclientdevicesand thewirednetwork,asshownearlierinFigureIntegratedAccessPointTseandViswanath:FundamentalsofWirelessCommunicationsPoint-to-Point Communication:Detection,DiversityandChannelUncertaintyDetectioninaCOMPONENTSOFAWIRELESSLANTypicallythereareacoupleof componentsessentialforawirelessLAN:AccessPointsAnaccesspointactsasthemainradiotransmitterforyourwirelessLANAccesspointstranslate networktrafficintoradiosignalsandtransmitthatsignaltowirelessenabledcomputersprinciplesofwirelessnetworkingtechnologiesasafoundationonwhich,a discussionofthepracticalaspectsofwirelessnetworkimplementationcanbegroundedWirelessnetworksarenetworksthatuseradiowavestoconnectdevices, withoutarchitectureCHAPTERWirelessLANDesignSomeoftheseele-mentsoverlapwiththoseofwirednetworks,butspecialconsiderationisneces-sary forallofthesecomponentswhendeployingawirelessnetworkDigitalbasebandandDSPConvertlow-frequencytohigher-frequency(suitableUnderstandthe componentsofthewirelessLANStandardWirelessNetworkingBluetooth,WiMAX,andRFIDSecuringWirelessLANsThefollowingfivechaptersde-scribe principlesoftechnologiesthatareusedinwirelessnetworks.Thenextthreechaptersdiscussthedetailsofwirelesswideareanetworks(WANs),andthelastfour chaptersdescribeshort-rangebroadbandandadhocwirelessnetworksWirelessNetworkSystemComponentsAwirelessnetworkconsistsofseveral componentsthatsupportcommunicationsusingradioorlightwavespropagatingthroughanairmedium