简介：Signalsarriveoutofphaseattheintendedreceiverfromcollaborativebeamforming（CB）nodesduetotheinstabilityintheoutputfrequencysignalsoftheuniversalsoftwareradioperipheral’s（USRP）localoscillator（LO）.Thesenodesincludingthetargetmustsynchronizetheiroscillatorfrequenciesforcoherentsignalreception.Inordertodothis,frequenciesandphasesofthesignalsshouldbeestimatedinsoftwaredefinedradio（SDR）andsmoothenwithnonlinearfilterssuchastheextendedKalmanfilter（EKF）.TheprocessnoiseparametersoftheNIUSRP-2920nodeswillhavetobecalculatedandusedwiththeEKFprocessnoisecovariancematrix.Thesenodesaregreencommunicationhardwaredeviceswheremostofthehardwareunitsarenowsoftwaredefined.ThisarticleusesthedirectspectrummethodtoobtainthephasenoisevaluesatvariousfrequencyoffsetsoftheNIUSRP-2920inordertocalculatethepowerspectraldensityoffractionalfrequencyfluctuation.Byapplyingthepower-lawnoisemodeltothisobtainedvalue,thegeneratedwhitefrequencynoiseandrandomwalkfrequencynoisevaluesareq1=1.93×10-21andq2=5.86×10-18,respectively.

简介：Thispaperdealswithinternallygeneratednoiseofbioelectricamplifiersthatareusuallyusedforprocessingofbioelectricevents.Themainpurposeofthispaperistopresentaprocedureforanalysisoftheeffectsofinternalnoisegeneratedbytheactivecircuitsandtoevaluatetheoutputnoiseoftheauthor'snewdesignedbioelectricamplifierthatcausedbyinternaleffectstotheamplifiercircuititselfinordertocompareitwiththenoisegeneratedbyconventionalamplifiers.Theobtainedanalysisresultsofinternallygeneratednoiseshowedthatthetotaloutputnoiseofbioelectricactivecircuitsdoesnotincreasewhensomeoftheirresistorshavealargervalue.Thisbehavioriscausedbythedifferenttransferfunctionsforthesignalandtherespectivenoisesourcesassociatedwiththeseresistors.Moreover,thenewdesignedbioelectricamplifierhasanoutputnoiselessthanthatforconventionalamplifiers.Theobtainedanalysisresultswerealsoexperimentallyverifiedandthefinalconclusionsweredrawn.

简介：介绍是被调节到需要的一个低噪音接口电路自己组装单层生物传感器SoC。读出电路的相关双采样(CDS)单位能有效地减少1/f噪音，KTC噪音和微数组的固定噪音。电路在0.6m/level被模仿7标准互补金属氧化物半导体过程，和模仿的结果证明输出电压与微数组的transducing电流有好线性。这是包括分享减少联合起来的CDS的一个普通一半电路和噪音的四个放大器的一个新奇电路。它能广泛地为微数组生物传感器被使用。

简介：Basedonthewhiteningpropertyofwavelettransformationfor1/fnoise,thispaperaddressestheproblemofdetectingdeterministicsignalsinthepresenceof1/ffractalnoise.Thetransferfunctionofwhiteningfilterisprovidedaswellastheconditionforwhitening.ThereceiverstructurebasedonKarhunen-Loeveexpansionandthedecisionrulearealsogiven.Finallyperformanceofthedetectorisanalyzed.

简介：与密码学的快速的发展，安全协议和加密算法的力量过量地依靠随机数的质量。在许多密码学应用程序，更高的速度是要求的引用之一。新安全随机数生成程序体系结构被介绍。它的哲学建筑学与FPGA被实现，基于热噪音和线性反馈位移寄存器(LFSR)。热噪音initializesLFSRs并且被用作系统的打扰的来源保证生产随机数的unpredictability并且改进系统的安全力量。平行LFSR能与长时期和更高的速度生产伪随机数。建议建筑学罐头在密码学满足高质量、高的速度的要求。

简介：InterferogramnoisereductionisaveryimportantprocessingstepinInterferometricSyntheticApertureRadar(InSAR)technique.Themostdifficultyforthisstepistoremovethenoisesandpreservethefringessimultaneously.Tosolvethedilemma,anewinterferogramnoisereductionalgorithmbasedontheMaximumAPosteriori(MAP)estimateisintroducedinthispaper.ThealgorithmissolvedundertheTotalGeneralizedVariation(TGV)minimizationassumption,whichexploitsthephasecharacteristicsuptothesecondorderdifferentiation.Theidealnoise-freephaseconsistingofpiecewisesmoothareasisinvolvedinthisassumption,whichiscoincidentwiththenaturalterrain.Inordertoovercomethephasewraparoundeffect,complexplanefilterisutilizedinthisalgorithm.Thesimulationandrealdataexperimentsshowthealgorithmcanreducethenoiseseffectivelyandmeanwhilepreservetheinterferogramfringesverywell.

简介：Thekeyofthesubspace-basedDirectionOfArrival(DOA)estimationliesintheestimationofsignalsubspacewithhighquality.Inthecaseofuncorrelatedsignalswhilethesignalsaretemporallycorrelated,anovelapproachfortheestimationofDOAinunknowncorrelatednoisefieldsisproposedinthispaper.TheapproachisbasedonthebiorthogonalitybetweenamatrixanditsMoore-Penrosepseudoinverse,andmadenoassumptiononthespatialcovariancematrixofthenoise.Theapproachexploitsthestructuralinformationofasetofspatio-temporalcorrelationmatrices,anditcangivearobustandpreciseestimationofsignalsubspace,soapreciseestimationofDOAisobtained.Itsperformancesareconfirmedbycomputersimulationresults.

简介：Inradartargettrackingapplication,theobservationnoiseisusuallynon-Gaussian,whichisalsoreferredasglintnoise.Theperformancesofconventionaltrackersdegradeseverelyinthepresenceofglintnoise.Animprovedparticlefilter,MarkovchainMonteCarloparticlefilter(MCMC-PF),isappliedtocopewithradartargettrackingwhenthemeasurementsareperturbedbyglintnoise.Trackingperformanceofthefilterisdemonstratedinthepresentofglintnoisebycomputersimulation.

简介：激光阶段噪音(LPN)在光协调系统起一个重要作用。基于Viterbi-Viterbi搬运人阶段评价(用户终端设备)的算法，在协调接收装置上强加的LPN的效果为调音的照阶段移动(QPSK)被调查，调音的8阶段移动(8PSK)和16照振幅调整(16正交调幅)光协调系统分别地。模拟结果证明在阶段评价算法的最佳的块长度是在LPN和添加剂白人Gaussian噪音(AWGN)之间的折衷，并且取决于调整格式的水平。到在协调接收装置的数字变换器(模数转换器)的类似物的决定要求独立于LPN或调整格式的水平。为103的位错误率(BER)，模数转换器的要求的位数字是6，并且获得为更高的分辨率是边缘的。

简介：影响在噪音特征上由拉曼效果导致了一弄空并且有损耗的双泵纤维光参量的放大器(FOPA)被调查。考虑拉曼效果，修改联合振幅方程第一被造，然后，拉曼的影响在Stokes和反上完成--司烧有不同起始的信号力量的波长进一步被分析。而且，FOPA获得上的效果也与一样的起始的信号力量和经常的噪音数字(NF)被显示出。

简介：Thecharacteristicsoflow-frequencyelectricalnoise,voltage-current(V-I)andelectricalderivationfor980nmInGaAsP/InGaAs/GaAshighpowerdoublequantumwelllasers(DQWLs)aremeasuredunderdifferentconditions.Thecorrelationofthelow-frequencyelectricalnoisewithsurfacenon-radiativecurrentofdevicesisdiscussed.Theresultsindicatethelow-frequencyelectricalnoiseof980nmDQWLswithhighpowerismainly1/fnoiseandhasgoodrelationwiththedevicesurfacecurrentatlowinjection.

简介：Insomeobjecttrackingsystems,themovingobjectfuturepositionisanarea(i.e.,targetarea).Itisasuccessfulestimationstrategyifthepredictedpointsfallinthetargetarea.Iftheobjectmakesasuddenmaneuvering,thepredictionmaygetoutofthetargetareaeasilywhichmaymakethetrackingsystemlosetheobject.Theaimistoinvestigatetheadmissiblemaximumobjectmaneuveringintensity,whichischaracterizedasmodelnoisevariance,forsuchkindoftrackingsystem.Firstly,theconceptofstochasticpassagecharacteristicsovertheboundaryoftargetareaandtheirrelationshipwithpredictionerrorvariancearedescribed.Secondly,theconsistencyamongtheindicesofregionalpole,predictionerrorvarianceandstochasticpassagecharacteristicsisanalyzed.Thirdly,themulti-indicesconstraintsarecharacterizedbyasetofbi-linearmatrixinequalities(BMIs).Then,theadmissiblemaximummodelnoisevarianceandthesatisfactoryestimationstrategyarepresentedbyiterativelysolvinglinearmatrixinequalities(LMIs)toapproximateBMIs.Finally,anumericalexampleisproposedtodemonstratetheobtainedresults.

简介：Inordertoimprovetheperformanceoflinespectrumdetection,accordingtothefeaturethattheunderwatertargetradiatednoisecontainingstablelinespectrum,thedifferencesofthephasedifferencebetweenlinespectrumandbackgroundnoise,aweightedlinespectrumdetectionalgorithmbasedonthephasevarianceisproposedinfrequencydomain.Afterphasedifferencealignment,thephasevarianceoflinespectrumandthephaseofbackgroundnoise,respectively,aresmallandbiginfrequencydomain,thismethodutilizestheweightedstatisticalalgorithmtocumulatethefrequencyspectrumbasedonthephasevariance,whichcanrestrainthebackgroundnoisedisturbance,andenhancethesignaltonoiseratio(SNR).Thetheoryanalysisandexperimentalresultsbothverifythattheproposedmethodcanwellenhancetheenergyoflinespectrum,restraintheenergyofbackgroundnoise,andhavebetterdetectionperformanceunderlowerSNR.

简介：Theproblemofoptimalcoherentdetectionoffrequency-shiftkeying(FSK)signalstransmittedoveranadditivecoloredGaussiannoisechannelwithimbalancegainsindifferentfrequencies(IGDF-ACGNchannel)isstudied.Thestructureoftheoptimalcoherentdetectorisderived.TheoreticalanalysisandcomputersimulationresultsshowthatthedetectorisoptimalineitheradditivecoloredGaussiannoiseenvironmentoradditivewhiteGaussiannoiseenvironment.

简介：联合测量系统的一个分布式的极化模式被设计并且实现了使用白轻interferometry。它能被用于极化模式在多达1km的high-birefringence纤维联合的测量。这个系统能在光纤的传感器和光纤维通讯中被使用。小浪变换在处理改进signal-noise-ratio的数据被采用。这个系统的signal-noise-ratio被改进在降噪以后的超过15dB。在signal-noise-ratio和测量精确性上降噪阀值的影响也被讨论。Hilbert变换和非线性的回归能与小浪变换一起被使用提高signal-noise-ratio和这个系统的空间分辨率。关键词小浪变换-降噪-极化CLCTN253-TP212.14这个工作被国家自然科学资金支持中国(号码60377031)，中国(号码2003CB314907)的国家基本研究程序，和为大学里的新世纪优秀才能的程序。

简介：Anideaofestimatingthedirectsequencespreadspectrum(DSSS)signalpseudo-noise(PN)sequenceispresented.WithouttheapriorityknowledgeabouttheDSSSsignalinthenon-cooperationcondition,weproposeaself-organizingfeaturemap(SOFM)neuralnetworkalgorithmtodetectandidentifythePNsequence.Anon-supervisedlearningalgorithmisproposedaccordingtheKohonenruleinSOFM.TheblindalgorithmcanalsoestimatethePNsequenceinalowsignal-to-noise(SNR)andcomputersimulationdemonstratesthatthealgorithmiseffective.Comparedwiththetraditionalcorrelationalgorithmbasedonslip-correlation,theproposedalgorithm’sbiterrorrate(BER)andcomplexityarelower.

简介：Multi-ThresholdCMOS(MTCMOS)isaneffectivetechniqueforcontrollingleakagepowerwithlowdelayoverhead.HoweverthelargemagnitudeofgroundbouncingnoiseinducedbythesleeptoactivemodetransitionmaycausesignalintegrityprobleminMTCMOScircuits.Weproposeamethodologyforreducinggroundbouncingnoiseunderthewake-updelayconstraint.Animprovedtwo-stageparallelpowergatingstructurethatcansuppressthegroundbouncingnoisethroughturnonsetsofsleeptransistorsconsecutivelyisproposed.Thesizeofeachsleeptransistorisoptimizedbyanovelsizingalgorithmbasedonasimpledischargingmodel.Simulationresultsshowthattheproposedtechniquesachieveatleast23%improvementintheproductofthepeakamplitudeofgroundbouncingnoiseandthewake-uptimewhencomparedwithotherexistingtechniques.

简介：Anewnoisereductionmethodbasedonensembleempiricalmodedecomposition(EEMD)isproposedtoimprovethedetectioneffectforfluorescencespectra.Polycyclicaromatichydrocarbons(PAHs)pollutants,asakindofimportantcurrentenvironmentalpollutionsource,arehighlyoncogenic.Usingthefluorescencespectroscopymethod,thePAHspollutantscanbedetected.However,instrumentwillproducenoiseintheexperiment.Weakfluorescentsignalscanbeaffectedbynoise,soweproposeawaytodenoiseandimprovethedetectioneffect.Firstly,weusefluorescencespectrometertodetectPAHstoobtainfluorescencespectra.Subsequently,noisesarereducedbyEEMDalgorithm.Finally,theexperimentresultsshowtheproposedmethodisfeasible.

简介：Theanalyticalexpressionofbiterrorprobabilityinabalanceddifferentialphase-shiftkeying(DPSK)opticalreceiverconsideringnonlinearphasenoiseandEDFAASEnoiseisgiven,whichisveryusefultoestimatetheperformanceofDPSKbalancedandunbalancedreceiverinopticalcommunicationsystem.Throughanalysis,ifonlynonlinearphasenoiseisconsidered,boththebalanceandunbalancedreceivershavethesameperformances.ButifaddingtheASEnoiseofEDFA,thebalancedreceiverisbetter.

简介：Duetothedemandofdataprocessingforpolariceradarinourlaboratory,aCurveletThresholdingNeuralNetwork(TNN)noisereductionmethodisproposed,andanewthresholdfunctionwithinfinite-ordercontinuousderivativeisconstructed.ThemethodisbasedonTNNmodel.InthelearningprocessofTNN,thegradientdescentmethodisadoptedtosolvetheadaptiveoptimalthresholdsofdifferentscalesanddirectionsinCurveletdomain,andtoachieveanoptimalmeansquareerrorperformance.Inthispaper,thespecificimplementationstepsarepresented,andthesuperiorityofthismethodisverifiedbysimulation.Finally,theproposedmethodisusedtoprocesstheiceradardataobtainedduringthe28thChineseNationalAntarcticResearchExpeditionintheregionofZhongshanStation,Antarctica.Experimentalresultsshowthattheproposedmethodcanreducethenoiseeffectively,whilepreservingtheedgeoftheicelayers.