简介:Whitenoisedeconvolutionorinputwhitenoiseestimationproblemhasimportantappli-cationbackgroundsinoilseismicexploration,communicationandsignalprocessing.Bythemoderntimeseriesanalysismethod,basedontheAuto-RegressiveMovingAverage(ARMA)innovationmodel,underthelinearminimumvarianceoptimalfusionrules,threeoptimalweightedfusionwhitenoisedeconvolutionestimatorsarepresentedforthemultisensorsystemswithtime-delayedmeasurementsandcoloredmeasurementnoises.Theycanhandletheinputwhitenoisefusedfiltering,predictionandsmoothingproblems.Theaccuracyofthefusersishigherthanthatofeachlocalwhitenoiseestimator.Inordertocomputetheoptimalweights,theformulaofcomputingthelocalestimationerrorcross-covariancesisgiven.AMonteCarlosimulationexampleforthesystemwith3sensorsandtheBernoulli-Gaussianinputwhitenoiseshowstheireffectivenessandperformances.
简介:Theproblemofadaptivefuzzycontrolforaclassoflarge-scale,time-delayedsystemswithunknownnonlineardead-zoneisdiscussedhere.Basedontheprincipleofvariablestructurecontrol,adesignschemeofadaptive,decentralized,variablestructurecontrolisproposed.Theapproachremovestheconditionsthatthedead-zoneslopesandboundariesareequalandsymmetric,respectively.Inaddition,itdoesnotrequirethattheassumptionsthatallparametersofthenonlineardead-zonemodelandthelumpeduncertaintyareknownconstants.Theadaptivecompensationtermsoftheapproximationerrorsareadoptedtominimizetheinfluenceofmodelingerrorsandparameterestimationerrors.Bytheoreticalanalysis,theclosed-loopcontrolsystemisprovedtobesemi-globallyuniformlyultimatelybounded,withtrackingerrorsconvergingtozero.Simulationresultsdemonstratetheeffectivenessoftheapproach.
简介:Toeliminatethealiasingthatappearedduringthemeasurementofmulti-componentsnonstationarysignals,anovelkindofanti-aliasingalgorithmbasedontheshorttimeFouriertransform(STFT)isbroughtforward.Firstthephysicalessenceofaliasingthatoccursisanalyzed;secondtheinterpolationalgorithmmodelissetupbasedontheHammingwindow;thenthefastimplementationofthealgorithmusingtheNewtoniterationmethodisgiven.Usingthenumericalsimulationthefeasibilityofalgorithmisvalidated.Finally,theelectricalcircuitexperimentshowsthepracticalityofthealgorithmintheelectricalengineering.
简介:Inlongtermevolution(LTE)uplinksinglecarrierfrequencydivisionmultipleaccess(SC-FDMA)system,therestrictionthatmultipleresourceblocks(RBs)allocatedtoausershouldbeadjacent,makestheresourceallocationproblemhardtosolve.Moreover,withthepracticalconstraintthatperfectchannelstateinformation(CSI)cannotbeobtainedintime-varyingchannel,theresourceallocationproblemwillbecomemoredifficult.Inthispaper,anefficientresourceallocationalgorithmisproposedinLTEuplinkSC-FDMAsystemwithimperfectCSIassumption.Firstly,theresourceallocationproblemisformulatedasamixedintegerprogrammingproblem.Thenanefficientalgorithmbasedondiscretestochasticoptimizationisproposedtosolvetheproblem.Finally,simulationresultsshowthattheproposedalgorithmhasdesirablesystemperformance.
简介:Thetime-frequencyanalysisofthesignalacquiredbyasingleground-basedmicrophoneshowsatwo-dimensionalinterferencepatterninthetime-frequencyplane,whichiscausedbythetimedelayofthereceivedsignalemittedfromalowflyingaircraftviathedirectpathandtheground-re-flectedpath.Amodelisdevelopedforestimatingthemotionparametersofanaircraftflyingalongastraightlineataconstantheightandwithaconstantspeed.MonteCarlosimulationresultsandex-perimentalresultsarepresentedtovalidatethemodel,andanerroranalysisofthemodelispresentedtoverifytheeffectivenessoftheestimationschemeadvocated.
简介:Inthispaper,thedesignofsignalconstellationsparametersisstudiedforDifferentialUnitarySpace-TimeModulation(DUSTM)basedonthedesigncriterionofmaximizingthediversityproduct.Further,nonintegersearchingmethodforthesignalconstellationparametersdesignisproposedinordertogetbettercodes.ExperimentalresultsshowthatunderthedifferentDopplerspreadanddatatransmissionrate,theproposeddesignperformsbetterthanthepreviousdesignusingintegerparametersinMultipleInputMultipleOutputOrthogonalFrequencyDivisionMultiplexing(MIMO-OFDM)systemoverfrequency-selectivefadingchannels.