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1、Location-restrictedServicesAccessControlLeveragingPinpointWaveformingTaoWang†,YaoLiu†,QingqiPei‡,andTaoHou††UniversityofSouthFlorida,Tampa,FL‡XidianUniversity,Xi’an,China{taow@mail,yliu@cse,taohou@mail}.usf.edu,qqpei@mail.xidian.edu.cnABSTRACTcontrolthatprovideswirelessservicestouser
2、sateligiblelocationsonly.Forexample,Weproposeanovelwirelesstechniquenamedpinpointwave-formingtoachievethelocation-restrictedserviceaccesscon-•Tofocuslimitedresourcesonlegitimatecustomers,trol,i.e.,providingwirelessservicestousersateligiblelo-restaurantsandcoffeeshopsmayofferinternetacc
3、esscationsonly.Theproposedsystemisinspiredbythefacttowirelessusersonlywhentheyaresittingattables.thatwhentwoidenticalwirelesssignalsarriveatareceiversimultaneously,theywillconstructivelyinterferewitheach•Companiesmayallowwirelessnetworkaccessonlytoothertoformaboostedsignalwhoseamplit
4、udeistwiceofemployeesworkinginselectedofficecubicles,inorderthatofanindividualsignal.Assuch,thelocation-restrictedtocomplyexportcontrolpolicies.serviceaccesscontrolcanbeachievedthroughtransmittingataweakpower,sothatreceiversatundesiredlocations•Inwirelesssurveillancesystem,themonitorca
5、meras(wheretheconstructiveinterferencevanishes),willexperi-mayneedtodelivertheirvideostreamstospecificusersencealowsignal-to-noiseratio(SNR),andhenceahighbitatspecificlocations,e.g,personnelinthesecuritycon-errorratethatretardsthecorrectdecodingofthereceivedtrolroom,toreducetheprivacyl
6、eakage.messages.Atthedesiredlocation(wheretheconstructiveSurprisingly,existingtechniquesfailtoachievethisgoalinterferencehappens),thereceiverobtainsaboostedSNRinasecureandefficientmanner.Wediscussexistingtech-thatenablesthecorrectmessagedecoding.niquesandtheirshortcomingsbelow.Tosolvet
7、hedifficultyofdetermininganappropriatetrans-mitpower,weproposetoentangletheoriginaltransmitsig-•Useraccountcontrol:Theserviceaccesscontrolnalsbyjammingsignalsofoppositephase.ThejammingcanbeachievedbycreatingindividualaccountsforsignalscansignificantlyreducetheSNRattheundesiredre-eachuse
8、r,whereauser
