简介:Theoptimalfusionsolutionwithfeedbackinformationforahybridmultisensordatafusionsystemispresented.Inthissystem,apartofsensorsprocesstheirdatalocallytoproducelocaltracks,andanotherpartofsensorsonlyprovidedetectionreportsThesetracksanddetectionreportsarecommunicatedtoacentralsitewheretrackfusionandcompositefilteringareperformed.Thecomparativeresultsonthesimulationssuggestthefeedbackinformationfromthecentercangreatlyimprovethetrackingperformanceofthelocalnode.
简介:CellularNeuralNetworks(CNN)withfeedbackmodeandM×Ncellsareequivalenttoanetworkwhichpossesses2M×Ncells,aneighborhoodwithmirror-likestructure,space-varianttemplatesandwithoutfeedbackaswellaswithoutinputtemplates.ThestabilityoftheCNNwithfeedbackmodeandtransformationswiththeneighborhoodofmirror-likestructurearediscussed.
简介:Athresholdsettingschemeisproposedbasedontheresourcemanagementandlimitedfeedbacktheoryinmultiuserorthogonalfrequencydivisionmultiplexing(OFDM)systems.Inadaptiveresourceallocation,thefactorsdenotingthequalityofservice(QoS)andfairnessarebothconsideredastheuserweight.Fromtheaspectoffeedbackoutageprobability,theproposedalgorithmsetsthethresholdforeachuserrelatedtoitsweight,whichbringsenoughfeedbacktotheuserwithgreaterweight.Analysisandsimulationresultsshowthat,comparedwiththethresholdignoringweights,theproposedschemehasmuchlowerfeedbackloadwhilewithbetterQoS.
简介:ThevariousuncertaintiesofMarsenvironmenthavegreatimpactontheprocessofvehiclesenteringtheatmosphere.Toimprovetherobustnessofcontrolsystemagainstthemodelerrorsandtoreducethecomputationalburden,anoptimalfeedbackbasedtrackingcontrollawisdeveloped.Thecontrolschemepresentedinthispaperdeterminestheamplitudeandthereversalsofbankanglerespectivelyinthelongitudinalandlateralflightplane.Ateachcontrolcycle,theamplitudeofthebankangleisobtainedbyanoptimalfeedbackcontrollertominimizetrackingerrors.Thecontrolgainsaretunedaccordingtotheclosed-looperrordynamicsbyusingoptimizationmethods.Thebankreversalsareexecutedifthecrossrangeexceedsapredeterminedcorridorwhichisdesignedbysettingaboundaryfunction.Theaccuracyandrobustnessoftheproposedclosed-loopoptimalfeedbackbasedcontrollawintrackingthereferencetrajectoryisverifiedvia500deviationsimulations,inwhichmodelingerrorsandexternaldisturbancesareconsidered.
简介:Inthispaper,thefeedbackloadreductionprobleminwirelesssystemsbasedonorthogonalfrequencydivisionmultiplexing(OFDM)isinvestigatedandanopportunisticfeedbackscheme(OFS)isproposed.ThekeyideabehindOFSisthatonlythekeychannelgainswhichcansignificantlyaffectthesystemthroughputarefedbacktotheBS.Firstly,thekeychannelgainsareprovedtobelongtoachannelgaininterval.Secondly,astatisticalmethodisproposedtoestimatethechannelgaininterval.Thirdly,theopportunisticfeedbackschemeisformulatedandthefeedbackloadofOFSisanalyzed.TheadvantageofOFSisthreefold:thefirstisOFScanworkinbothOFDM-basedmulticastsystemandOFDM-basedunicastsystem.ThesecondisthechannelfadingtypeoftheBS-userlinkisnotrequired,whichismorerealistic.ThethirdisOFScangetbetterfeedbackloadperformancecomparedwithotherschemes,whileachievingalmostthesamethroughputperformancecomparedwiththatoffullfeedbackscheme.
简介:Bydeducingthedistributionofthenormalizedchannelcovariancematrix,anovellimitedfeedbackschemeisproposedundermultipleusers(MU)multiple-inputmultiple-output(MIMO)broadcastchannel(BC)system.Theproposedschemehasadvantagesinthreeaspects.First,ithasnoconstraintsonthenumberofusersorantennas.Second,eachuser'sfeedbackbitsareindependentofthenumberofreceivingantennas.Third,theproposedschemeavoidsthestorageoflarge-sizecodebookonthetransceivers.Simulationresultsshowthattheperformanceoftheproposedschemeisclosetotheperfectchannelstateinformation(CSI)caseanditjustneedsasmallnumberoffeedbackbits.
简介:Backoffmechanismisakeycomponentofcontention-basedmediumaccesscontrol(MAC)layerprotocol.IthasbeenshownthatthebackoffmechanismofIEEE802.11standardmaybeveryinefficientespeciallywhenthenetworkiscongested.Numbersofmethodshavebeenproposedtotunethecontentionwindow(CW)withtheaimtoachievetheoptimalthroughputinIEEE802.11WLANs.However,themechanismsdonotspecificallyaddresspropersettingsforthevariablepacketlengthinfluenceandCWdivergingproblem.Thispaperproposesanovelfour-wayhandshakingfull-feedbackbackoffalgorithmnamedadoptivecontentionwindowbackoff(ACWB)toovercomethesedrawbacks.Theperformanceoftheproposedalgorithmisinvestigatedthroughanalysisandsimulation.SimulationresultsdemonstratethattheACWBalgorithmprovidesaremarkableperformanceimprovementintermsofshort-termfairness,packetdelayanddelayjitter,whilemaintaininganoptimalthroughputclosetothetheoreticalthroughputlimitoftheIEEE802.11distributedcoordinationfunction(DCF)accessscheme.
简介:Inthispaperanewmethodtorealizerationalgeneralizedtransferfunctionsoflinearshift-variantdigitalfiltersthroughstatefeedbackispresentedInsomepracticalapplicationstherequiredcharacteristicsofthefilterchangeslowly.Underthesecircumstances,theproposedmethodisveryeffectiveandtheresultingfilterstructureissimple.Anumericalexampleisprovidedtoshowtheperformanceofthemethod.
简介:Themainchallengesofdatastreamsclassificationincludeinfinitelength,concept-drifting,arrivalofnovelclassesandlackoflabeledinstances.Mostexistingtechniquesaddressonlysomeofthemandignoreothers.Soanensembleclassificationmodelbasedondecision-feedback(ECM-BDF)ispresentedinthispapertoaddressallthesechallenges.Firstly,adatastreamisdividedintosequentialchunksandaclassificationmodelistrainedfromeachlabeleddatachunk.Toaddresstheinfinitelengthandconcept-driftingproblem,afixednumberofsuchmodelsconstituteanensemblemodelEandsubsequentlabeledchunksareusedtoupdateE.Todealwiththeappearanceofnovelclassesandlimitedlabeledinstancesproblem,themodelincorporatesanovelclassdetectionmechanismtodetectthearrivalofanovelclasswithouttrainingEwithlabeledinstancesofthatclass.Meanwhile,unsupervisedmodelsaretrainedfromunlabeledinstancestoprovideusefulconstraintsforE.AnextendedensemblemodelExcanbeacquiredwiththeconstraintsasfeedbackinformation,andthenunlabeledinstancescanbeclassifiedmoreaccuratelybysatisfyingthemaximumconsensusofEx.ExperimentalresultsdemonstratethattheproposedECM-BDFoutperformstraditionaltechniquesinclassifyingdatastreamswithlimitedlabeleddata.
简介:Basedonthestrategyofinformationfeedbackfromfollowerstotheleader,flockingcontrolofagroupofagentswithaleaderisstudied.Theleadertracksapre-definedtrajectoryandatthesametimetheleaderusesthefeedbackinformationfromfollowerstotheleadertomodifyitsmotion.Theadvantageofthiscontrolschemeisthatitreducesthetrackingerrorsandimprovestherobustnessoftheteamcohesiontofollowers'faults.Theresultsofsimulationareprovidedtoillustratethatinformationfeedbackcanimprovetheperformanceofthesystem.
简介:Thispaperdevelopscloudbasedsoftwarecomputingasaservice(SCaaS)inthehybridevolutionalgorithmwithfeedbackassistancetosolvethedataoptimalNP-completeproblemssuchastravelsalesmanproblemsandjobshopschedulingproblems.Suitablesteps,methods,orproceduresofthegeneticalgorithmcanbeadoptedfromvariousevolutionproceduresormethodsofthegeneticalgorithmsbasedonthefitnessevaluationresultsandsurvivalratioofdifferentcrossovermethodsinthecurrentgeneration.Theproposedsystemcandynamicallyemphasizethecorrespondingmethodsorproceduresforthebetterperformanceinoptimalsolutionsearching.Inaddition,accordingtotheproposedXMLformat,systemuserscanuploadonlythecodingofchromosomeswithoutimplementingthegeneticalgorithmprogram.Furthermore,byusingthefeedbackassistance,theconvergencetimeoftheoptimalsolutioncanbeenhanced.IndexTermsCloudcomputing,evolutionalgorithm,jobshopschedulingproblem,travelingsalesmanproblem.
简介:Theimpactanglecontroloverguidance(IACG)lawagainststationarytargetsisproposedbyusingfeedbacklinearizationcontrol(FLC)andfinitetimecontrol(FTC).First,thispapertransformsthekinematicsequationofguidancesystemsintothefeedbackablelinearizationmodel,inwhichtheguidancelawisobtainedwithoutconsideringtheimpactangleviaFLC.Forthepurposeofthelineofsight(LOS)angleanditsrateconvergingtothedesiredvalues,thesecond-orderLOSangleisconsideredasadouble-integralsystem.Then,thispaperutilizesFTCtodesignacontrollerwhichcanguaranteethestatesofthedouble-integralsystemconvergingtothedesiredvalues.NumericalsimulationillustratestheperformanceoftheIACG,incontrasttotheexistingguidancelaw.
简介:Thevoltagecontrolledoscillator-based(VCO-based)continuous-timedelta-sigma(CTDS)analogtodigitalconverter(ADC)suffersfromnonlinearityandmismatchinitsfeedbacknetwork.Anewfeedbacknetworkconsistingofaphaseshifterisproposed.Thephaseshifterreplacesthedigitaltoanalogconverter(DAC)intheproposedarchitecture.Feasibilityoftheproposedideaisdiscussedanditshigherperformanceisillustratedthroughabehavioralsimulationapproach(CppSim).Wehavealsodevelopedthephaseshifterasavariableall-passfilterintheClanguage.ThenonlinearityandmismatchofthesystemcausedbyDACismitigated,resultinginhighersignaltonoiseratio(SNR)andsignaltonoiseanddistortionratio(SNDR),respectively.
简介:Thepapermainlystudiesthesum-rateperformanceoflimitedfeedback(LFB)block-diagonalization(BD)inmulti-userdistributedantennasystem(DAS).Asthechannelstateinformation(CSI)fedbacktobasestation(BS)islimited,multi-userinterference(MUI)iscausedinevitablybecauseofthequantizationerror.ConsideringtheinfluenceoftheMUItothecapacityofDAS,weproposeaparameterofeffectivesum-rateratio(ESRR)todenotethecapacityoffsetundertheconditionoftheBScangetperfectCSIandlimitedCSIfirst,thenweconfirmthattheapproximatedESRRisveryclosetoactualESRRgotthroughsimulations.Afterthat,basedontheapproximatedESRR,anadaptiveminimumbitfeedbackschemewhichcaneffectivelyreducetheoverheadoffeedbackchannelandthecomplexityofthesystemisproposed.Simulationresultsshowtheeffectivenessoftheproposedscheme.
简介:Ageneralmultiple-loopfeedbackapproachforrealizationofFour-TerminalFloatingNullorRC(FTFN-RC)filterispresented.Theproposedfilterisconstructedbymulti-outputFTFNs,capacitorsandresistors.Itcansimultaneouslyrealizeslow-pass,band-pass(iforderisevennumber),andhigh-passfilterresponses.WithRCelementsgroundedandrequiringnocomponentmatchingcon-straints,itisfullyintegratedconveniently.Simulationsareperformedforthefourth-orderButterworthfiltertoverifythevalidityofthecircuit.