简介：Thespectraldensityofthequasi-homogeneous(QH)lighthasbeenknownwhenitscattersonQHmediaorpropagatesinfreespace.ThecasethatQHsourcesaresurroundedbyQHmediaisproposedinthispaper.Undertheparaxialapproximation,thespectraldensityoftheQHlightpropagatingthroughQHmediaisderived.AmodifiedscalinglawforthepropagationoftheQHlightthroughQHmediaisalsoobtained.Thislawalsoholdstrueinthefarfieldbeyondtheparaxialapproximation.

简介：Accordingtothetheoryoftestingasphericalsurfacebynormalaberrationcompensationmethod,thedesigningmethodofquasi-universalcompensatorisstudied.Onthebasisofthird-orderaberrationtheory,aftercalculatingandoptimizingwithanopticaldesignprogram,thestructureparametersofacompensatorareobtained.ThisnewcompensatorcouldbeusedinTwyman-Greeninterferometer,andinmeasurementofacertainrangeofparaboloidellipsoidandhyperboloid.Thecompensationaccuracyismorethan0.02λ.

简介：AclassofQuasi-SystematicBlock-CirculantLow-DensityParity-Check(QSBC-LDPC)codesisproposed.Block-circulantLDPCcodeshavebeenstudiedalotrecently,becausethesimplestructuresoftheirparity-checkmatricesareveryhelpfultoreducetheimplementationcomplexities.QSBC-LDPCcodesarespecialblock-circulantLDPCcodeswithquasi-systematicparity-checkma-trices.ThememoriesforencodersofQSBC-LDPCcodesarelimited,andtheencodingprocesscanbecarriedoutinasimplerecursivewaywithlowcomplexities.ResearchesshowthattheQSBC-LDPCcodescanprovideremarkableperformanceswithlowencodingcomplexities.

简介：Withtheemergenceoflocation-basedapplicationsinvariousfields,thehigheraccuracyofpositioningisdemanded.Byutilizingthetimedifferencesofarrival(TDOAs)andgainratiosofarrival(GROAs),anefficientalgorithmforestimatingthepositionisproposed,whichexploitstheBroyden-Fletcher-Goldfarb-Shanno(BFGS)quasi-Newtonmethodtosolvenonlinearequationsatthesourcelocationundertheadditivemeasurementerror.Althoughtheaccuracyoftwo-stepweighted-least-square(WLS)methodbasedonTDOAsandGROAsisveryhigh,thismethodhasahighcomputationalcomplexity.Whiletheproposedapproachcanachievethesameaccuracyandbiaswiththelowercomputationalcomplexitywhenthesignal-to-noiseratio(SNR)ishigh,especiallyitcanachievebetteraccuracyandsmallerbiasatalowerSNR.Theproposedalgorithmcanbeappliedtotheactualenvironmentduetoitsreal-timepropertyandgoodrobustperformance.Simulationresultsshowthatwithagoodinitialguesstobeginwith,theproposedestimatorconvergestothetruesolutionandachievestheCramer-Raolowerbound(CRLB)accuracyforbothnear-fieldandfar-fieldsources.

简介：在一个伪同步的代码部门多重存取(QS-CDMA)系统，在起源附近的关联函数影响系统性能和奇怪的函数象平函数一样重要。三种零个关联地区(ZCZ)序列被用来分析并且比较关联功能。调音的二进制阶段移动(BPSK)有传播在添加剂白人Gaussian噪音(AWGN)上编码隧道的三种QS序列的QS-CDMA系统的模拟证明这些序列是伪直角的，他们因此对QS-CDMA合适系统。在系统表演和顺序的零个关联地区之间的关联也被证明。

简介：Therecursivestructureandquasi-recursivestructureofAdaptiveVolterraFil-ter(AVF)areputforward,theiralgorithmsaregiven,andtheircharacteristicsandapplicationsarediscussed.TheintroductionofrecursivestructurecanremarkablyreducetheparametersandcomputationalcostofAVF.

简介：一个修改基因算法(GA)被建议了，它在察觉到系统的伪静电干扰纤维栅栏习惯于波长解调。GA的修正方法被介绍了，相关数学模型被建立了。客观功能和与GA互连的单个健康评估策略也被建立。GA上的人口尺寸，染色体尺寸，代，转线路概率和变化概率的影响被分析了，并且修改GA的最佳的参数被获得了。模拟和实验，修改GA能被用于察觉到系统的伪静电干扰纤维栅栏的表演，和精确是的波长解调平等者到或不到3下午。CLC数字TN253

简介：ThekeyprobleminunstructuredP2Psystemishowtocontrol'Flood'.Somestudiesfocusonconstructingmoreefficienttopologywhileothersfocusonbetterqueryalgorithms.ThispaperpresentsHICUS(HierarchicalInterest-drivenCommunity-basedUnstructuredSystem)motivatedbyabasicthought-whethertheresourcescorrelatewithtopologydistinguishesstructuredandunstruc-turedP2Pessentially.Byintroducinghierarchical'interest',HICUSorganizesaquasi-structuredtopologythroughapuredistributedway,andprovidesanewplatformforqueryalgorithms.Westudytheprocedureandperformanceoftopologyorganization,andthesimulationsshowthatHICUSformsasmall-worldwhichcansignificantlyimprovetheroutingefficiency.

简介：Thezero-voltagequasi-resonantboostswitchingDC-DCconverterhasbeeninves-tigatedbyusingthetimeaveragingequivalentcircuitapproachofperiodicallyswitchinglinearnetworks.TheDCsteadystateandACsmallsignalcharacteristicsoftheconverterarealsogiven.

简介：Thedevicestructureandtechnicalprocessingsofquasi-planarself-alignedsiliconavalancheelectronemissionarrayarcintroduced.Theprocessingstepattheedgeofelectronemissionregionisabout10nmonlyandthewidthofself-alignedcurrentchannelofshallowAsimplantationisabout3μm.ItsI-Vcharacteristicsshowalargerlinearregionandlowerseriesresistancethanthatoftheprevioussiliconavalancheelectronemissiondevices.Someoftheelectronemissioncharacteristicsarealsodiscussedinthispaper.

简介：设计的一条改进欧几里德几何学的几何学途径伪周期(质量管理)有高率、低的错误地板的低密度的同等值检查(LDPC)代码被论述。构造QC-LDPC代码与高率比原来的代码有更低的错误地板。最小的重量codeword的分发被分析，并且最小的重量codeword的一个足够的存在条件被发现。很多QC-LDPC与更低的错误地板编码的模拟表演能被减少最小的重量codewords的数字设计令人满意这个足够的条件。

简介：Amodelofquasi-CPA(chirpedpulseamplification)system,inwhichtheinputisthetransform-limitedGaussianpulses,issetupnumericallytoinvestigatetheimpactofthesecondorderdispersionontheadaptivecompensationofself-phasemodulation(SPM)effect.Theadaptivephasepre-shapingcontrolledbydifferentialevolutionalgorithmisintroducedtotheinputpulsebeforeamplificationandrecompression.Withmaximizingthepeakpoweroftheoutputpulse,thesimulationresultsshowthatthenormaldispersionisreallyhelpfultoeliminatethesidelobesoftheoutputpulseandincreasethepulsepeakpower.