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1、RDJUNIOFORNUANTSIVEDRANSSTANFORDUNIVERSITYLTIEYLOR91GANIZED18EE359WIRELESSCOMMUNICATIONSProfessorAndreaGoldsmithWirelesscommunicationsisarapidlygrowingsegmentofthecommunicationsindustry.Thenumberofcell-phoneusersaloneisexpectedtopass1billionworldwidewithinthen
2、extfewyears,andwirelessLANsarealsopoisedtoexperienceexponentialgrowth.Wirelesstechnologynotonlysupportsvoice,data,andvideocommunicationbetweenportabledeviceslocatedanywhereintheworld,butalsoprovidesthebackbonetechnologyforsensornetworks,smarthomes,telemedicine
3、andremotelearning,andautomatedfactoriesandvehicles.Thiscoursewillcoverthefundamentalwirelesscommunicationtechniquesthatsupportthesevariousapplications,withaprimaryfocusonthecommunicationsystemdesign.Webeginwithabriefoverviewofcurrentwirelesssystemsandstandards
4、,including2ndand3rdgenerationcellularsystems,wirelessLANs,wideareawirelessdatasystems,satellitenetworks,andBluetooth.Wethencharacterizethewirelesschannel,includingpathlossfordifferentenvironments,randomlog-normalshadowingduetosignalattenuation,andtheflatandfrequ
5、ency-selectivepropertiesofmultipathfading.Nextweexaminethefundamentalcapacitylimitsofwirelesschannelsandsomecharacteristicsofthetransmissionstrategiesthatachievetheselimits.Thisgivesusaperformanceboundagainstwhichwecancomparepracticalschemesaswellasinsightinto
6、optimaltransmitterandreceiverdesigns.Infact,thecapacityresultsindicatethatforflat-fadingchannels,adaptivemodulationordiversitycanprovidesignificantcapacityimprovements.Thenextpartofthecourseisspentinvestigatingtechniquesforcommunicatingoverwirelesschan-nels.Wefir
7、streviewdigitalmodulationtechniquesandthenstudytheirperformanceunderwirelesschan-nelimpairments,includingflatandfrequencyselectivefading.Wefindthatmultipathfadingseverelydegradestheperformanceofcommunicationsystems,andwethereforeneedmethodstoovercometheinherenti
8、mpairmentsofthewirelesschannel,inparticularflatandfrequencyselectivefading.Wenextinvestigatethedesignandperformanceoftwotechniquestomitigatetheeffectsofflatfading:adaptivemodulationan
