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AnEfficientWirelessExtensionPointPlacementAlgorithminUrbanRectilinealWLANs.pdf

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1 AnEfficientWirelessExtensionPointPlacement AlgorithminUrbanRectilinealWLANs AaronSo,StudentMember,IEEEandBenLiang,SeniorMember,IEEE Abstract—Withasmallamountofsoftwaremodification,supportingbitratesupto11Mbps.Twomorerecentstandards, wirelessExtensionPoints(EPs),whicharenowcommerciallyIEEE802.11aand802.11g,whicharebasedonOrthogonal available,canbeusedtoimprovethethroughputcapacityofaFrequencyDivisionMultiplexing(OFDM),arecapableof WirelessLocalAreaNetwork(WLAN).AnEPisanimmobile devicethathasaccesstothepowersupplyorisequippedwithsupportingupto54Mbpsdatarates.Theincreaseinbitrateis ahighcapacitybatterybutdoesnothavedirectaccesstotheheavilymotivatedbythedemandforcontent-richweb-based Internet.TheyrelaydatawirelesslybetweentheAccessPointapplications.Forbothreal-timeandnon-realtimeapplications, (AP)andthemobilehosts.Inthispaper,weinvestigatethetheuserdataraterequirementshaveincreaseddramaticallyin optimalplacementofEPssuchthatthethroughputcapacityrecentyears.Tosatisfytheincreasingdemandofmobileusers, ofanurbanrectilinealWLANcanbemaximized.Twochannel modelsarestudied,basedontheShannoncapacityboundandnewstrategiesareneededtoimprovetheperformanceofthe IEEE802.11specifications.WefirstformulateasolutionfortheWLANtechnologies.Themainobjectiveofthisworkisto optimalEPplacementprobleminageneralnetworkscenarioasincreasetheaveragebitratebetweentheaccesspointandthe anon-linearprogrammingproblem,thenweproposeanefficientmobilehost. algorithmthatdeterminestheoptimallocationsofafixednumberAprodigiousamountofefforthasbeenspentonimproving ofEPsinarectilinealnetwork.Ourresultsshowthat,fora widerangeofsystemparameters,theoptimallyplacedEPscanthecapacityofwirelessnetworkswithinthephysicallayer. significantlyincreasethenetworkthroughputcapacity.Moreover,Techniquessuchasarrayantennas,spacetimecoding[1],and westudyhowthenumberofEPs,transmissionpower,pathlossadaptivebeamforming[2]arepromisingtechniquesthatare exponent,channelmodelsandtrafficcharacteristicsaffecttheoftendescribedasthefinalfrontierofwir