RF Sensor Networks for Device-Free Localization_ Measurements, Models, and Algorithms

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1、INVITEDPAPERRFSensorNetworksforDevice-FreeLocalization:Measurements,Models,andAlgorithmsThispaperconsiderssituationswhereapersonoranobjectcanbeexaminedVeveninbuildingsandthroughwallsVbecauseawirelessnetworkusesRFsignalsasaprobe.ByNealPatwariandJoeyWilsonABSTRACT

2、Inthispaper,wediscu

3、sstheemergingapplica-changescausedbypeople’sinteractionwiththeRFEMtionofdevice-freelocalization(DFL)usingwirelesssensorwavefieldtoinfertheirposition.Wecallthestaticwirelessnetworks,whichfindpeopleandobjectsintheenvironmentindevicesusedforthispurpose‘‘RFsensors,’’becausetheywhichthe

4、networkisdeployed,eveninbuildingsandthroughareusedtomeasurethesignaloneachlinkbetweenwalls.Thesenetworksaretermed‘‘RFsensornetworks’’devices.SuchanetworkwecallanRFsensornetwork,asbecausethewirelessnetworkitselfisthesensor,usingradio-opposedtotheterm‘‘wirelesssensornetwork,’’whichfr

5、equency(RF)signalstoprobethedeploymentarea.DFLinreferstoageneral-purposenetworkofsensors.Thisareaofclutteredmultipathenvironmentshasbeenshowntoberesearchisalsocalled‘‘device-free’’localization(DFL)[1]1feasible,andinfactbenefitsfromrichmultipathchannels.Wetoemphasizethatapersondoesn

6、otneedtobecarryingadescribemodalitiesofmeasurementsmadebyRFsensors,thewirelessdevicetobedetectedandlocated,or‘‘sensorlessstatisticalmodelswhichrelateaperson’spositiontochannelsensing’’becausesensornetworkresearcherstypicallydomeasurements,anddescriberesearchprogressinthisarea.notco

7、nsidertheradiotobeasensor[2].Withorwithoutaradiotransmitter(TX)orreceiver(RX)onthem,aKEYWORDS

8、Fading;multistaticradar;radiowavepropagation;person’spresenceatalocationaffectstheradiowavessensorsystemsandapplications;signalprocessing;wirelessnearby.Thisareaisrelatedtoradar,includingu

9、ltrawide-sensornetworksband(UWB)andmultiple-input–multiple-output(MIMO)radarsystems,butisnotlimitedtotheseframeworks.ThereisanadvantagetosensingRFenergyasopposedI.INTRODUCTIONtolight,infrared,orthermalenergywhenattemptingtoWirelessnetworksareubiquitous.Whereverweare,weinferpeople’s

10、movements.Visiblelightcame