简介：Anoveltwo-wayrotaryjoint(SandPband)isdescribed.ForSbandrotaryjoint,VSWRislessthan1.2overthefrequencyrangefrom1.2GHzto4.4GHz.ForPbandrotaryjoint,thestructureofthereentrantresonatorisusedtoreducethelengthoftherotaryjointtoaboutλ/4,andthespecialandsmallsizerequirementissatisfied.

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简介：Measuringradiometricquantitiesoflightcanbedonebywayofalge-braicinsert.Andalsoafunctionofradiomeertricquantitiesoflightsourceispresented.Thespectrumdispersionlawoflightsourceisgiven.

简介：Analysisofthescatteringparameters(S-parameters)ofplanarN-waymetamaterialpowerdividers/combinersmostlyusescommercialmicrowavecircuitsimulatorsduetothelargecircuitsizeinvolved.Thispaperpresentsanefficientcircuitmodelingapproach,whichisbasedonthemulti-inputandmulti-outputtransmissionmatrix(T-matrix)method,toanalyzetheS-parameterofaplanarnine-waymetamaterialpower-divider/combinerstructure.S-parametercomputationresultsareshowningoodagreementwiththesimulationresultsbyusingtheAgilentadvanceddesignsystem(ADS)andmeasurementresults.ThecomputationtimeofanN-waymetamaterialpowerdivider/combinerwithN=5,9,13,and17usingT-matrixmethodisalsocomparedwiththoseofADSandAWRMicrowaveOffice(MWO)todemonstrateitscomputationalefficiency.

简介：Thispaperconsidersafrequency-divisionduplex(FDD)two-waychannelwithchannelestimationerror,wherechannelgainsareindependentofeachother.Itderivestheexactclosed-formoutageprobabilityexpressionsintheFDDsystemwithanalognetworkcoding(ANC)byuseofprobabilitytheory.Toprovidemoreinsights,anapproximatedversionfortheexactoutageprobabilityisalsodevelopedinthemedium-to-highsignal-to-noiseratio(SNR)region.ThesimulationresultsshowthatthederivedexactoutageprobabilitiesmatchtheresultsofMonteCarlosimulationsinallSNRregions,whiletheapproximatedoutageprobabilitiesalsoapproachthesimulationresultswhenthechannelconditionisgood.ItisinterestingthatANCintheFDDtwo-waychannelisprovedtooutperformthatofinthetime-divisionduplex(TDD)channelbythecomputersimulation.

简介：系统总是在当前的文学基于完整的交通负担被设计并且优化。然而，实际系统很少在完整的负担正在操作，甚至在山峰交通小时。而不是最大化系统率完成完整的负担，与要求的率最小化transmit力量的一个最佳的精力有效的计划在这篇文章被调查。考虑情形是用物理层网络编码的amplify-and-forward协议的一条双向继电器隧道，在二个结束节点在二timeslots以内经由多重继电器节点交换消息的地方。联合功率分配和继电器选择计划被设计完成最小播送功率。通过凸的优化理论，我们第一证明那个单个继电器选择计划是为物理层网络编码的最精力有效的方法。力量分配的靠近形式的表情也被给。数字模拟在不同计划之中表明设计计划以及比较的表演。

简介：在这份报纸，在直角的频率部门multiplexing(OFDM)上的双向中继的一种网络情形被考虑，在哪个二个节点打算经由使用物理层的网络编码的一个继电器(PLNC)交换信息。假设完整的隧道知识是可得到的，一个优化问题，在和力量限制下面最大化可完成的和率，被调查。优化问题是非凸的，这被显示出，它是困难的以计算复杂性发现全球最佳答案。在后果，一个低复杂性的最佳的力量分配计划为实践实现被建议。一张连接能力图首先在每副载波上为力量分配被采用。随后，放松的优化问题和Karush-Kuhn-Tucker(KKT)调节的等价物在每副载波之中为力量分配被开发。模拟结果证明实质的能力获得被与一个低复杂性的计算努力高效地实现建议计划完成。

简介：NetworkCoding(NC)bringscorrelationbetweenthecodedsignalsfromdifferentsources,whichmakesthesystemmorevulnerabletothedecodeerroratrelay.ConventionalCyclicRedundancyCode(CRC)hasbeenimplementedforerrorbitdetection.However,itserrorcorrectionissimplyignored.Tofullyexploitthisfeature,thispaperproposesanoveljointLog-LikelihoodRatio(LLR)CRCerrormitigationforNCtwowayrelaychannel.SpecificthresholdsaredesignedtoestimatetheerrornumberofdatablockandidentifythosewhichcanberecoveredifthenumberiswithintheerrorcorrectionscopeofCRC.Weexaminetwomodesofthethresholds,onebasedontheaverageBitErrorRate(BER)ofsource-relaylink,whiletheotherbasedonthatofinstantaneousone.WeprovidethefullanalysisforthePair-wiseErrorProbability(PEP)performanceofthescheme.AvarietyofnumericalresultsarepresentedtorevealthesuperiorityoftheproposedschemetoconventionalCRCNCunderindependentRayleighfadingchannels.Moreover,theefficienciesoftheproposedthresholdsarealsovalidated.

简介：Timesynchronizationtechniques,especiallyonthepulsepersecond(PPS)temporalbasis,haveattractedgrowingresearchinterestsinrecentyears.Inthispaper,wehaveproposedandexperimentallydemonstratedahigh-precisiontwo-waytimetransfer(TWTT)systemtorealizelong-distancedisseminationof1PPSsignalgeneratedbyahydrogenmaser.Adense-wavelength-division-multiplexing(DWDM)systemandbi-directionalerbium-dopedfiberamplifiers(Bi-EDFAs)havealsobeenadoptedtosuppresstheimpactofRayleighbackscatteringandoptimizethesignaltonoiseratio(SNR)aswell.Wehavetheoreticallyanalyzedthesystematicdelayindetail.Theultimaterootmeansquare(RMS)variationoftimesynchronizationaccuracyissub-26psandthetimedeviationcanbereducedtoaslowas1.2psat100sand0.253psat12000s,respectively.