简介：Akindofnovelbinaryphasecodenamedsidelobesuppressioncodeisproposedinthispaper.Itisdefinedtobethecodewhosecorrespondingoptimalsidelobesuppressionfilteroutputstheminimumsidelobes.Itisshownthattheredoexistsidelobesuppressioncodesbetterthantheconventionaloptimalcodes-Barkercodes.Forexample,thesidelobesuppressioncodeoflength11withfilteroflength39hasbettersidelobelevelupto17dBthanthatofBarkercodewiththesamecodelengthandfilterlength.

简介：改进了并置的超级正向纠错(super-FEC)的三个新奇计划代码在长拖光传输系统的发展趋势和存在FEC代码的缺点以后被建议被分析了。芦苇贤明之人(RS)+Bose-Chaudhuri-Hocguenghem(BCH)的性能模拟内部外部的连续并置的代码被实现，编码/译码并置平行的代码的概念被介绍。而且，模拟为RS结果(255，239)+RS(255，239)代码和theRS(255，239)+RS(255，223)二连续并置的代码是有这的一个优异编码方案的代码表演与经典RS相比作为更好的纠错，中等冗余性和容易的实现有利(255，239)代码和其它代码，并且他们的信号噪声比获得是分别地多于RS的2～3dB(255，239)在1x10~的误码率的代码(-13)。最后，新奇连续并置的代码的帧结构被安排在设计它的硬件打一个坚挺的基础。

简介：mc2llvmisaprocess-levelARM-to-x86binarytranslatordevelopedinourlabinthepastseveralyears.Currently,itisabletoemulatesinglethreadedprograms.Weextendmc2llvmtoemulatemulti-threadedprograms.Ourmaintaskistoreconstructitsarchitectureformulti-threadedprograms.Registermapping,codecachemanagement,andaddressmappinginmc2llvmhaveallbeenmodified.Inaddition,tofurtherspeeduptheemulation,wecollecthotpaths,aggressivelyoptimizeandgeneratecodeforthematruntime.Additionalthreadsareusedtoalleviatetheoverhead.Thus,whenthesamehotpathiswalkedthroughagain,thecorrespondingoptimizednativecodewillbeexecutedinstead.Inourexperiments,oursystemis8.8XfasterthanQEMU(quickemulator)onaveragewhenemulatingthespecifiedbenchmarkswith8guestthreads.

简介：也就是，二维的光直角的代码(2-DOOC)的一个新家庭修改了二次的一致代码(MQCC)/optical直角的代码(OOC)被建议当波长跳跃和散布时间的模式，采用MQCC和OOC分别地。通过分析MQCC/OOC的表演，我们能看到MQCC/OOC的关联性质仍然是理想的。同时，我们的分析证明建议新代码家庭能比另外的代码得到更多的集的势并且能改进光代码分割的位错误率(BER)多重存取(OCDMA)有效地。

简介：编码基于的方法的一篇小说说出同样本地的二进制取向代码(LBOCode)因为palmprint识别被建议。palmprint图象第一与Gabor过滤器的一个银行被卷，然后取向信息与一条winner-take-all规则被达到。随后，产生取向印射数组被一致本地二进制模式操作。因此，LBOCode图象被完成它在象素水平包含palmprint取向信息。进一步，我们把LBOCode图象划分成几相等尺寸并且nonoverlapping区域，和摘录从每个区域的统计代码直方图独立地，它在地区性的水平造对palmprint的全球描述。在匹配舞台，在二palmprints之间的匹配的分数被精明的二张空间提高的直方图的不同完成，它带计算简洁的利益。试验性的结果证明建议方法与几个最先进的方法的相比完成更有希望的识别性能。

简介：ThislettergivesarandomconstructionforLowDensityParityCheck(LDPC)codes,whichusesaniterativealgorithmtoavoidshortcyclesintheTannergraph.TheconstructionmethodhasgreatflexiblechoiceinLDPCcode'sparametersincludingcodelength,coderate,theleastgirthofthegraph,theweightofcolumnandrowintheparitycheckmatrix.ThemethodcanbeappliedtotheirregularLDPCcodesandstrictregularLDPCcodes.Systemiccodeshavemanyapplicationsindigitalcommunication,sothisletterproposesaconstructionofthegeneratormatrixofsystemicLDPCcodesfromtheparitycheckmatrix.Simulationsshowthatthemethodperformswellwithiterativedecoding.

简介：Codedisseminationisanimportantbuildingblockofwirelessreprogramming.Wenoticethatcurrentcodedisseminationprotocolsfailstoconsiderpageselectionandenergybalancing.Inthispaper,wepresentanintegratedmutualselectionbasedcodedisseminationprotocol(MSD).ThekeyideaofMSDismutualselectioncomprisingsenderselectionandpageselection.Byexploitinglinkqualityinformationinmutualselection,MSDenhancesthepropagation.Further,MSDtakesenergylevelinformationinthesenderselection,thusavoidinglowpowernodes'over-consumption.WesimulateMSDbysettingsofMica-Zmotes.SimulationresultsshowthatMSDcanreducethecompletiontimeandaveragetransmission,andhelplowpowernodesavoidunnecessarytransmissionandenergyconsumption.

简介：Thisarticleisfocusedonanalyzingthekeytechnologiesofnewmaliciouscodeandcorrespondingdefensivemeasuresinthelarge-scalecommunicationnetworks.Basedondescriptionoftheconceptsanddevelopmentofthemaliciouscode,thearticleintroducestheanti-analysistechnology,splittingandinsertingtechnology,hidingtechnology,polymorphvirustechnology,andautoproductiontechnologyofthemaliciouscodetrendswithintelligence,diversityandintegration.Followingthat,itsummarizesthesecurityvulnerabilitiesofcommunicationnetworksfromfourrelatedlayersaspects,accordingtothemechanismsofmaliciouscodeinthecommunicationnetworks.Finally,itproposesrapidresponsedispositionofmaliciouscodeattacksfromfourcorrelatedsteps:buildingupthenetworknodemonitoringsystem,suspiciouscodefeatureautomationanalysisandextraction,rapidactivemaliciouscoderesponsetechniqueforunknownmaliciouscode,andmaliciouscodeattackimmunitytechnique.Asaresult,itactivelydefensesagainsttheunknownmaliciouscodeattacksandenhancesthesecurityperformanceofcommunicationnetworks.

简介：Awayofresolvingspreadingcodemismatchesinblindmultiuserdetectionwithaparticleswarmoptimization(PSO)approachisproposed.IthasbeenshownthatthePSOalgorithmincorporatingthelinearsystemofthedecorrelatingdetector,whichistermedasdecorrelatingPSO(DPSO),cansignificantlyimprovethebiterrorrate(BER)andthesystemcapacity.Asthecodemismatchoccurs,theoutputBERperformanceisvulnerabletodegradationforDPSO.Withablinddecorrelatingscheme,theproposedblindDPSO(BDPSO)offersmorerobustcapabilitiesoverexistingDPSOundercodemismatchscenarios.

简介：Tocompresshyperspectralimages,alowcomplexitydiscretecosinetransform(DCT)-baseddistributedsourcecoding(DSC)schemewithGraycodeisproposed.UnlikemostoftheexistingDSCschemes,whichutilizetransforminspatialdomain,theproposedalgorithmappliestransforminspectraldomain.Set-partitioning-basedapproachisappliedtoreorganizeDCTcoefficientsintowaveletliketreestructureandextractthesign,refinement,andsignificancebitplanes.TheextractedrefinementbitsareGrayencoded.Becauseofthedependencyalongthelinedimensionofhyperspectralimages,lowdensityparitycheck-(LDPC)-basedSlepian-WolfcoderisadoptedtoimplementtheDSCstrategy.Experimentalresultsonairbornevisible/infraredimagingspectrometer(AVIRIS)datasetshowthattheproposedparadigmachievesupto6dBimprovementoverDSC-basedcoderswhichapplytransforminspatialdomain,withsignificantlyreducedcomputationalcomplexityandmemorystorage.

简介：Thisarticleproposesatime/frequencysynchronizationalgorithminthemultipleinputmultipleoutput(MIMO)systems,inwhichtheperfectcompletegeneralizedcomplementaryorthogonallooselysynchronouscodegroupsareusedasthesynchronizationsequence.Thesynchronizationalgorithmisdividedintofourstages:1)synchronizationintimedomainbysignalautocorrelation;2)synchronizationinfrequencydomainbyfastFouriertransform(FFT);3)multipathdissociationusingcoherentdetectionandfinetimesynchronization;4)finefrequencyoffsetestimationbyphaserotation.Aspertheperfectcompletegeneralizedcomplementaryorthogonallooselysynchronouscodegroups,thecross-correlationandout-of-phaseauto-correlationforanyrelativeshiftbetweenanytwocodesisalwayszero.Thisidealpropertymakesthetime/frequencysynchronizationalgorithmsimpleandefficient.Thesimulationresultsshowthateveninthemultipathfastfadingchannelwithlowsignalnoiseratio(SNR),theMIMOsystemcangetsynchronizedbothinthetimedomainandfrequencydomainwithhighstabilityandreliability.

简介：ThemultilevelmodulationtechniquesofM-DifferentialAmplitudePhaseShiftKeying(DAPSK)havebeenproposedincombinationwithTurbocodeschemefordigitalradiobroadcastingbandsbelow30MHzradiochannel.ComparisonofthismodulationmethodwithchannelcodinginanAdditiveWhiteGaussianNoise(AWGN)andmulti-pathfadingchannelshasbeenpresented.TheanalysisprovidesaniterativedecodingoftheTurbocode.

简介：Space-TimeBlock(STB)codehasbeenaneffectivetransmitdiversitytechniqueforcombatingfadingduetoitsorthogonaldesign,simpledecodingandhighdiversitygains.Inthispaper,aunit-ratecomplexorthogonalSTBcodeformultipleantennasinTimeDivisionDuplex(TDD)modeisproposed.Meanwhile,TurboCoding(TC)isemployedtoimprovetheperformanceofproposedSTBcodefurtherbyutilizingitsgoodabilitytocombatthebursterroroffadingchannel.Comparedwithfull-diversitymultipleantennasSTBcodes,theproposedcodecanimplementunitrateandpartialdiversity;andithasmuchsmallercomputationalcomplexityunderthesamesystemthroughput.Moreover,theapplicationofTCcaneffectivelymakeupfortheperformancelossduetopartialdiversity.SimulationresultsshowthatontheconditionofsamesystemthroughputandconcatenationofTC,theproposedcodehaslowerBitErrorRate(BER)thanthosefull-diversitycodes.

简介：TheionospherictimedelayisoneofthemainerrorsourcesinC/AcodeGPSnavigationandpositioningapplications.Inthispaper,amethodisproposedforreal-timedual-frequencyionospherictime-delaycorrectingusingaC/AcodeGPSreceiver,andtheprincipleofthecircuitblockdiagramforthismethodisanalyzedwithitsfeasibilitytheoreticallydemonstrated.

简介：Inordertofurtherimprovethecarriersynchronizationestimationrangeandaccuracyatlowsignal-to-noiseratio(SNR),thispaperproposesacode-aidedcarriersynchronizationalgorithmbasedonimprovednonbinarylow-densityparity-check(NB-LDPC)codestostudythepolarization-division-multiplexingcoherentopticalorthogonalfrequencydivisionmultiplexing(PDM-CO-OFDM)systemperformanceinthecasesofquadraturephaseshiftkeying(QPSK)and16quadratureamplitudemodulation(16-QAM)modes.Thesimulationresultsindicatethatthisalgorithmcanenlargefrequencyandphaseoffsetestimationrangesandenhanceaccuracyofthesystemgreatly,andthebiterrorrate(BER)performanceofthesystemisimprovedeffectivelycomparedwiththatofthesystememployingtraditionalNB-LDPCcode-aidedcarriersynchronizationalgorithm.

简介：为了压制边带，multiband引起直角的频率部门multiplexing(MB-OFDM)的干扰基于认知收音机系统，边带信号的一个数学表达式被导出。基于这表情，在播送符号之中的限制，帮助压制干扰，被获得。与限制结合了，块涡轮代码调整计划的一种类型被建议。在调整计划，边带干扰快速被稀释。与另外的技术相比，在这个计划，干扰抑制更容易并且足够地被实现。同时，小点错误率(BER)表演能被改进。理论分析和模拟结果证明MB-OFDM-based认知收音机系统受不了瑞利褪色是高度适用的。

简介：研究是关于压制搬运人的return-to-zero(CS-RZ)的产生方法，单个边带return-to-zero(SSB-RZ)格式化。当CS-RZ和SSB-RZ格式在标志重叠分别地被使用时，表演被模仿并且分析快频率跳跃光代码分割以10Gb/s的传播率的多重存取(SO-FFH-OCDMA)系统。模拟证明两种格式在OCDMA系统是适用的。为用CS-RZ或SSB-RZ的系统，Q因素随输入力量的增加随传播距离的增加和增加降级。而且，有CS-RZ的SO-FFH-OCDMA系统的性能比一样的传播距离和输入力量的SSB-RZ的擅长。