资源描述：
《无线通信(Wireless Communication by A.Goldsmith) .pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、RDJUNIOFORNUANTSIVEDRANSSTANFORDUNIVERSITYLTIEYLOR91GANIZED18EE359WIRELESSCOMMUNICATIONSProfessorAndreaGoldsmithWirelesscommunicationsisarapidlygrowingsegmentofthecommunicationsindustry.Thenumberofcell-phoneusersaloneisexpectedtopass1billionworldwidewithinthenextfewyears,
2、andwirelessLANsarealsopoisedtoexperienceexponentialgrowth.Wirelesstechnologynotonlysupportsvoice,data,andvideocommunicationbetweenportabledeviceslocatedanywhereintheworld,butalsoprovidesthebackbonetechnologyforsensornetworks,smarthomes,telemedicineandremotelearning,andaut
3、omatedfactoriesandvehicles.Thiscoursewillcoverthefundamentalwirelesscommunicationtechniquesthatsupportthesevariousapplications,withaprimaryfocusonthecommunicationsystemdesign.Webeginwithabriefoverviewofcurrentwirelesssystemsandstandards,including2ndand3rdgenerationcellula
4、rsystems,wirelessLANs,wideareawirelessdatasystems,satellitenetworks,andBluetooth.Wethencharacterizethewirelesschannel,includingpathlossfordifferentenvironments,randomlog-normalshadowingduetosignalattenuation,andtheflatandfrequency-selectivepropertiesofmultipathfading.Nextwe
5、examinethefundamentalcapacitylimitsofwirelesschannelsandsomecharacteristicsofthetransmissionstrategiesthatachievetheselimits.Thisgivesusaperformanceboundagainstwhichwecancomparepracticalschemesaswellasinsightintooptimaltransmitterandreceiverdesigns.Infact,thecapacityresul
6、tsindicatethatforflat-fadingchannels,adaptivemodulationordiversitycanprovidesignificantcapacityimprovements.Thenextpartofthecourseisspentinvestigatingtechniquesforcommunicatingoverwirelesschan-nels.Wefirstreviewdigitalmodulationtechniquesandthenstudytheirperformanceunderwire
7、lesschan-nelimpairments,includingflatandfrequencyselectivefading.Wefindthatmultipathfadingseverelydegradestheperformanceofcommunicationsystems,andwethereforeneedmethodstoovercometheinherentimpairmentsofthewirelesschannel,inparticularflatandfrequencyselectivefading.Wenextinve
8、stigatethedesignandperformanceoftwotechniquestomitigatetheeffectsofflatfading:adaptivemodulationan
