2.4GHz DSSS WLAN Cascade Analysis

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1、2.4GHzDirectSequenceTMWirelessLANCascadeAnalysisApplicationNoteMay2000AN9810.1Authors:RobertRood,DougSchultz-5Abstract(SNR)fora10BitErrorRate(BER).TheCSMA/CAprotocolallowsonlyoneuser,perchannel,atatime(i.e.,Thepaperdescribesthecascadefirstcome,firstserve)makingforaquietermedium.TheanalysisofanIEEE

2、802.11directprocessinggain,achievedbyspreadingthesignalwithasequencewirelessLANradiointhePNcode,allowsafaintsignaltobepulledfromthenoise2.4GHzISMband.Astepbystepwhilesuppressingnon-correlatinginterferers.approachistakenincluding:Basicsystemarchitecturedecisions,gaindistribution/IFlimiteranalysisan

3、dfinallytheAsingleantennaisused,althoughtwoantennasarecompletecascadeanalysis.ImportantRFparametersforsupportedfordiversitytocountertheeffectsofmulti-patheachfunctionblockinboththereceiveandtransmitchainsfading.Fromtheantenna,thereceivedinputisappliedtoareevaluatedandthedesigntrade-offsareexplored

4、.thepre-selectfilterFL1.Thisfilterisatwopoledielectricdesign,rejectinginterferersoutsidethe2.4GHzISMbandIntroductionandprovidingimagerejection.WirelessLocalAreaNetwork(WLAN)iscomingontotheTheT/RswitchisintegratedintotheHFA3925RFPowermarketplacewithaflurryofproductsofvarioustypesandAmplifier.Theswi

5、tchinreceivemodeleadstotheHFA3424designs.WirelessoffersadifferentparadigmforcomputerLowNoiseAmplifier,whichisusedtosetthenoisefigurenetworkusersandcapabilitiesbreakingthetethersofthefortheentirereceiver.wiredonlynetwork.ThispaperwillexploretheprocessofdevelopingthearchitectureofonesuchWLANsystem.N

6、ext,thesignalenterstheHFA3624RF/IFConverter,firstpassingthroughtheintegratedLNAsectionandthengoingWhatshouldaWLANradiodo?Whataretheneedsoftheoff-chiptoFL2.FilterFL2isaninexpensive2polemonolithicmarketplace?WhatperformanceispossibleintheLCbandpassfilterusedtosuppressimagenoise.technology?Whereshouldt

7、hecompromisebetweencostandperformancebemade?ThesearethetypesofquestionsoneThesignalthenentersthedownconvertersectionofthehastoanswerwhensettinggoalsforanewradioarchitecture.HFA3624.Low-sidelocaloscillatorinjectio