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：Anewiterativemethodforsignal,restorationhasbeenpresented.AnestimateoperatorW_κwhichisrelatedtoerroroperatorB_κintherestorationprocessisintroducedtodecreasetheestimateerrorandincreasetheconvergencerate.Theeffectofnoiseontheestimateprocesshasalsobeendescribed.Finally,themethodhasbeenappliedtothedeconvolutionofablurredsignal,andtheresultsvalidatethemethod.Acomparisonbetweenthepresentedmethodandthegeneralmethodhasalsobeengiven.

简介：Basedonuniformcirculararrayanditselementoutputsignaldelaydelayanovelmethodforestimationofspatialfrequency,azimuthandelevationispresented.Withoutanyspectralpeaksearchandparameterspairing,theresultingmethodis(?)resolutionandsmallvariance,eveninshortdatalength.Computersimulation(?)effectivenessofthismethod.

简介：Astaticapproachmethodmethodisusedtogetthespectrumexpressionofthepulseintervalmodulationsignal.Theexpressionissimple,hasaclearphysicalconceptandithasbeenconfirmedbyasimultaneousexperiment.

简介：ThetransmissiondelayofphotogeneratedcarriersinaCMOS-process-compatibledoublephotodiode(DPD)isanalyzedbyusingdevicesimulation.TheDPDsmallsignalequivalentcircuitmodelwhichincludestransmissiondelayofphotogeneratedcarriersisgiven.Fromanalysisonthefrequencydomainofthecircuitmodelthedevicehastwopoles.OnehastherelationshipwithjunctioncapacitanceandtheDPD'sload,theotherwiththedepthandthedopingconcentrationoftheN-wellintheDPD.DifferentdepthoftheNwellanddifferentareaoftheDPDswithbandwidthwerecompared.TheanalysisresultsareimportanttodesignthehighspeedDPDs.

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：Themainfunctionofelectronicsupportmeasuresystemistodetectthreatingsignalsinordertotakecountermeasuresagainstthem.Toaccomplishthisobjective,aprocessofassociatingeachinterleavedpulsewithitsemittermustbedone.Thisprocessistermedsortingorde-interleaving.Anovelpointsymmetrybasedradarsorting(PSBRS)algorithmisaddressed.Inordertodealwithallkindsofradarsignals,thesymmetrymeasuredistanceisusedtoclusterpulsesinsteadoftheconventionalEuclideandistance.Thereferencepointsofthesymmetricalclustersareinitializedbythealternativefuzzyc-means(AFCM)algorithmtoamelioratetheeffectsofnoiseandthefalsesorting.Besides,thedensityfiltering(DF)algorithmisproposedtodiscardthenoisepulsesorclutter.Theperformanceofthealgorithmisevaluatedundertheeffectsofnoiseandmissingpulses.IthasbeenobservedthatthePSBRSalgorithmcancopewithalargenumberofnoisepulsesanditiscompletelyindependentofmissingpulses.Finally,PSBRSiscomparedwithsomebenchmarkalgorithms,andthesimulationresultsrevealthefeasibilityandefficiencyofthealgorithm.

简介：Selfscanningphotodiodearray(SSPA)isakindofsolidstateimagingsensor.ThesignalprocessingmethodusingaspecialsectorSSPAwasinvestigated.BasedontheprincipleandcharacteristicsofSSPA,asignalacquisitionandprocessingmethodcontrolledbycomputerwasintroduced.Theamplificationofweaksignal,thematchingoftimesequence,thefastpeakholdingwithlowleakage,thehighspeedA/Dconversionandnonlinearcorrectionwerediscussed.ThismethodcanacquirethepeaksignalofeveryringofsectorSSPAwithhighaccuracyandinrealtime.Itcanbeusedtodetectthedistributionofspacelightenergy.

简介：TherearetwomajorapproachesforBlindSignalSeparation(BSS)problem:MaximumEntropy(ME)andMinimumMutualInformation(MMI)algorithms.BasedontherecursivearchitectureandtherelationshipbetweentheMEandMMIalgorithms,anExtendedME(EME)algorithmisproposedbyusingprobabilitydensityfunction(pdf)estimationoftheoutputstodeducethecorrespondingiterativeformulasinBSS.Basedonthesimulationresults,itcanbeconcludedthattheproposedalgorithmhasbetterperformancesthanthetraditionalMEalgorithminconvolutemixtureBSSproblems.

简介：AnewSuboptimalMaximumLikelihoodEstimation(SMLE)algorithmbasedonfull-derampmodelanditsimplementationinsatellite-borneradaraltimeterarepresented,withemphasisontheinfluenceofboththereturnfluctuationandthereceivernoiseonheightandslopeestimationprecision.Someconclusionsareobtainedandverifiedbycomputersimulation.

简介：侦察混血儿雷达信号的一条参数评价途径联合了调音的频率移动(频移键控)，调音的阶段移动(PSK)被介绍。第一，多相的差别被采用计算即时频率(如果)FSK/PSK，那么，频移键控的频率点从直方图被估计如果。PSK的代码率从阶段断绝的地点被提取。最后，收到的信号的平方的多相的差别被计算估计频移键控的代码率。当signal-to-noise比率(SNR)在11dB上面时，介绍算法有参数评价的更高的精确性。

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：ABayesianestimationmethodtoseparatemulticomponentsignalswithsinglechannelobservationispresentedinthispaper.Byusingthebasisfunctionprojection,thecomponentseparationbecomesaproblemoflimitedparameterestimation.Then,aBayesianmodelforestimatingparametersissetup.ThereversiblejumpMCMC(MonteCarloMarkovChain)algorithmisadoptedtoperformtheBayesiancomputation.Themethodcanjointlyestimatetheparametersofeachcomponentandthecomponentnumber.SimulationresultsdemonstratethatthemethodhaslowSNRthresholdandbetterperformance.

简介：Todetectthelaserdopplersignal,theunknownsignalistrackedbytheknownsignalusingtheconceptoftopologicalcontravariance.TheunknowntopologicalspaceUandknownspaceMarefounded,andthentheunknownsignal'stransformationistrackeddynamicallyaccordingtothismappingrelationshipbetweenthetwospaces.Thesystemequationisobtainedbygradient-descentmethod,andtheconditionsofstabilityaregivenbyPoincarémapping.Theproposedmethodisappliedtomeasurethein-planedisplacementsignalofthesolid50mawayusinglaserdoppler,signal.Theresultprovesthatthemethodcandetectlaserdoppler.signalaccurately,itsrelativeerrorislessthan0.7%.

简介：ThisletterdemonstratesthestructureofthepassiveradarusingTVsignals.BecausetheTVsignalisakindofpseudoperiodicsignal,thematchedfilteringofcolorTVsignalswouldyieldhighsidelobeswhichcausetherangeambiguity.Toovercomethisproblem,themismatchedfilterisproposedtosuppressthecorrelationsidelobesofmatchedfilteringofTVsignals.Byutilizingtheiterationprocess,thismethodcouldachievetherequiredpeaksidelobelevel.Theimpactsofthenoiseandtargetmovementonmismatchedfilteringarealsoanalysed.Simulationresultsareincludedtodemonstratetheeffectivenessoftheproposedtechnique.

简介：ALarge-signalmodelforGaAsFETisderivedbasedonitssmall-signalSparame-tersandDCcharacteristics.TheharmonicbalancealgorithmisappliedtoanalyzeandoptimizetheFETfundamentalandharmonicoscillators,andthevaluesofsteadycurrentareobtained.Inthesolvingprocess,asimplifiedCADapproachisusedtoobtaintheparametersofmatchingnetworkwhentheoutputpowerismaximum.Finally,afundamentaloscillatorandaharmonicoscillatorofQ-bandarefabricated.Themeasurementsshowthatthetheoreticalanalysisandexperimentalresultsareingoodagreement.