简介:TheChnstantMndulusAlgoriihm(CMA)enjoyWidepreadpopularityasmethodsforblindbeamform-ingandequalzzationofcommunicationsignals.CMAisstraightforwardtoimplement,robust,andcomputation-zllyofmixierarecomplexity.Furtherlnore,itisinsensitiuetoarrayimperfection.Inanenvironmentcontaintingmultipleconsrantmndulussignals,thesignalextractedbyCMAdependsontherelativepoweroftheincidentsig-nals.Accordingpreviousanrks,theCMAisI,ronewcapturetheStrongestConstantModulus(CM)Signalatthe,outputofthearray.Inthispoper,weshowthattheweakCMsignalcouldberecoveredbyCMA1-2andCMA2-1whenseuingspecialstep-siss.Szmulatzonexamplesconfzrmourremarks.
简介:Photoelectricpropertyofpolyanilinedopedwithdodecyl-benzeneincreasesobviously,whenpolyanilinedopedwithDBSAisirradiatedwithlight,Mixtureofsensitivematerialisadvantageoustotheabsorptionofpolyanilineinvisiblelightspectrum,andtheconductivityisalsoimproved.TheresultsofdielectricmeasurementsonpolyanilinedopedwithDBSAinanAl-PAn-DBSA-Alconfigurationasfunctionoffrequencyandtemperaturearereported.Thespace-chargepolarizationphenomenonisobserved.Carrierlifetimeismicrosecondmagnitudeandmobilityis(0.001-0.1)cm^2/V·s,whichareobtainedbycalculationorexperiment.Theactiveenergyisobtainedfromtherelationbetweenconductivityandtemperature.TheconductingmechanismofPAn-DBSAisanalyzed.
简介:与缺点多层的分数维的领唱者的二新奇结构被介绍。光传播矩阵方法被用来计算发射度和反射。与一般领唱者相比多层,这些新奇结构有更宽的stopbands并且在更宽的stopbands的中间给超级狭窄的乐队看,它能被用作超级狭窄的通带过滤器。当在领唱者有一个嵌入的缺点时,通行证乐队能是1530nm的红外线的波长附近的不到0.6nm多层。在中央波长的光传播比99%高,它意味着一很低插入损失。如果有三层,三座超级狭窄的山峰能在stopband的中间被发现。中央波长是分别地1232.4nm,1372.8nm和1538.3nm。它比其它种狭窄的乐队过滤器好一些,它可以在光通讯被使用。CLC数字O482.3这个工作被国家科学基金支持(60577043),上海教育委员会(217608)的发展基础和上海领先的大学教师惩罚工程(T0102)。
简介:Bistaticforward-lookingsyntheticapertureradar(SAR)hasmanyadvantagesandapplicationsowingtoitstwodimensionalimagingcapability.Therecouldbevariousimagingconfigurationsbecauseofthegeometricflexibilityofbistaticplatforms,resultinginkindsofmodelsbuiltindependentlyamongwhichtherecouldbesomesimilareventhesamemotionfeatures.Comprehensiveresearchonsuchsystemsinamorecomprehensiveandgeneralpointofviewisrequiredtoaddresstheirdifferenceandconsistency.PropertyanalysisofbistaticforwardlookingSARwitharbitrarygeometryisachievedincludingstripmapandspotlightmodesonairborneplatform,missile-borneplatform,andhybridplatformofboth.Emphasisisplacedonazimuthspacevarianceofsomekeyparameterssignificantlyaffectingthesubsequentimagingprocessing,basedonwhichthefrequencyspectraarefurtherdescribedandcomparedconsideringrespectivefeaturesofdifferentplatformsforfrequencyimagingalgorithmdeveloping.Simulationresultsconfirmtheeffectivenessandcorrectnessofouranalysis.
简介:Inthispaperthedesignproblemofperfect-reconstructioncosine-modulatedQMFbankshasbeenformulatedasaquadratic-constrainedleast-squares(QCLS)minimizationprobleminwhichallconstrainedmatricesoftheQCLSoptimizationproblemaresymmetricandpositivedefinite.AcostfunctionwhichisaconvexfunctionofdesiredprototypefiltercoefficientsisconstructedsothatthiskindofQCLSoptimizationproblemscanbeefficientlysolved.Soaglobalminimizerofthisproblemcanbeeasilyobtained.Resultsoftwodesignexamplesarepresentedtosupportthederivationsandanalyses.
简介:在这份报纸,我们描述基本原则和连续波浪洞铃流光谱学(CWCRDS)的系统设计。我们特别地也学习性质和一个新奇方法的行为到去谐激光并且把它用于一个洞铃流光谱学实验。模拟和实验在在传播特征和不同反射率之间的关系上被完成,以及扫描速度。产量电场方程被推出。这被调查了光子怎么被联合到洞并且怎么作为时间的功能从洞积累紧张和漏缝。紧张和腐烂时间的两累积减少,这被注意,并且当反射率增加,摆动振幅增加。有减少扫描速度的相对紧张增加。另外,模拟证明一个去谐得非的洞显示高度依赖于镜子反射率和压电的翻译程序(PZT)调整速度的播送信号。模拟也显示关上的激光与detuning不同。
简介:Lanthanidehasattractedmuchattentioninthefieldofopticalcommunicationsinrecentyears.SomepropertyanalysesonopticalwaveguideofNd-dopedcrystalNdxY1-xAl3(BO3)4andNd:MgO:LiNbO3aremadeinthispaper,followedbyintroductionofthemethodsofexperimentationandtheoreticalcalculationfortheplanaropticalwaveguides.Therefractiveindexprofilesoftheopticalwaveguidesareanalyzed.Theaboveworkoffersusefulinformationforstudyonnewtypematerialsforopticalcommunications.