简介：Therecentadvancesontheresearchandtheapplicationsoftheintegratedopticsacousto-opticspectrumanalyzer(IOSA)arereviewed.Theoperatingprinciple,ar-chitecture,characteristicsandtechnology,andfuturedevelopmentofthedifferentre-ceiersaredescribed.

简介：Wienerfilteringisusedtoestimatereceiverfunctioninatime-domain.Withtheverticalcomponentof3-componentteleseismicPwaveformastheinputofaWienerfilter,receiverfunctionasthefilterresponse,andradialandtangentialcomponentsastheexpectedoutput,receiverfunctionisestimatedbyminimizingtheerrorbetweenexpectedandactualoutputs.ReceiverfunctioncanbeobtainedbysolvingtheToeplitzequationusingtheLevinsonalgorithm.Thenon-singularityoftheToeplitzequationensuresthestabilityofWienerDeconvolution.BothsyntheticandobservationalseismogramcheeksshowthatWienerDeconvolutionisaneffectivetime-domainmethodtoestimatereceiverfunctionfromteleseismicPwaveform.

简介：Arobustdigitalreceiverbasedonamatchedfilter(MF)isproposedfortheradiofrequencyidentification(RFID)readersystemtoenhancethereliabilityofsignalprocessingintheelectronicproductcode(EPC)sensornetwork(ESN).Theperformanceoftheproposedreceiverisinvestigatedbyexaminingtheanti-collisionalgorithmintheEPCglobalClasslGeneration2protocol.Thevalidityandusefulnessaredemonstratedbybothcomputersimulationsandexperiments.Basedontheverificationresults,comparingwiththeconventionalzerocrossingdetector(ZCD)basedreceiver,theproposedreceiverisveryrobustagainststrongamplitudedistortionsandconsiderablefrequencydeviationshappeningonthebackscatteredsignalfromapassivetag.

简介：这篇文章为溪流控制转移提出一个算法有有限接收装置缓冲区(RBUF)的协议(SCTP)改进。这是众所周知的，SCTP是最重要的转移控制协议之一，但是大多数研究集中于没有RBUF限制的状况。在这研究，我们在表演上分析RBUF尺寸的影响。计算机模拟证明网络实用程序在可靠转移是低的，当RBUF尺寸比带宽延期产品小时。由学习传播顺序数字(TSN)转移进步，我们发现同伴接收装置窗户(PEER_RWND)落后于真接收装置窗户(RWND)，导致差的网络用途。与有限RBUF改进SCTP性能，虚拟接收装置窗口(VIRTUAL_RWND)被介绍。基于VIRTUAL_RWND，一个算法被建议增加送的率。计算机模拟在两个评估了建议算法的优秀表演没有失去的包的理想的连接和有失去的包的非理想的连接。

简介：一个高精确性频率同步方法为长期的进化推进了的第三个产生合伙工程(3GPP)被建议(LTE--一)downlink接收装置及时部门duplexing(TDD)模式。一般来说，周期的前缀(CP)关联基于评价方法和主要同步表明的部分频率偏移量(FFO)(PSS)微分关联基于的整数频率偏移量(IFO)评价方法被申请LTE--频率同步。然而，当由于噪音干扰，系统FFO接近频率评价范围的边时，基于的FFO评价结果可以得到的CP的极性逆行；PSS基于IFO评价在低信号噪音比率(SNR)有表演降级。我们建议极性察觉帮助了基于的FFO评价和频率领域提高了的CP微分关联获得频率同步的更高的精确性的基于的IFO评价。计算机模拟证明建议方法极大地超过常规方法，特别在低SNR情形。

简介：Inthispaper,wedescribetheestimationoflow-altituderefractivitystructurefromsimulationandrealground-basedGPSdelays.Theverticalstructureoftherefractiveenvironmentismodeledusingthreeparameters,i.e.,ductheight,ductthickness,andductslope.Therefractivitymodelisimplementedwithaprioriconstraintsontheductheight,thickness,andstrength,whichmightbederivedfromsoundingsornumericalweather-predictionmodels.Araypropagationmodelmapstherefractivitystructureintoareplicafield.Replicafieldsarecomparedwiththesimulationobserveddatausingasquarederrorobjectivefunction.Aglobalsearchforthethreeenvironmentalparametersisperformedusingageneticalgorithm.Theinversionisassessedbycomparingtherefractivityprofilesfromtheradiosondestothoseestimated.Thistechniquecouldprovidenear-real-timeestimationoftheductingeffect.Theresultssuggestthatground-basedGPSprovidessignificantatmosphericrefractivityinformation,despitecertainfundamentallimitationsofground-basedmeasurements.Radiosondesaretypicallylaunchedjustafewtimesdaily.Consequently,estimatesoftemporallyandspatiallyvaryingrefractivitythatassimilateGPSdelayscouldsubstantiallyimproveover-estimatescausedbyusingradiosondedataalone.

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简介：Currently,1bitor2bitsignalquantizationiswidelyusedinsatellitenavigationsoftwarereceivers.Thebit-wiseparallelalgorithmhasbeenproposedfor1bitand2bitsignalquantization,whichperformscorrelationwithhighefficiency.Inordertoimprovetheperformanceofthecorrelator,thispaperproposesanew1.5bitquantizationmethod.Theoreticalanalysesaremadefromtheaspectsofcomplexityandquantizationloss,andperformancecomparisonbetween1.5bitquantizationcorrelatorandtraditionalcorrelatorsisdiscussed.Theresultsshowthatthe1.5bitquantizationalgorithmcansaveabout30percentcomplexityundersimilarquantizationloss,reducemorethan0.5dBsignalnoiseratio(SNR)lossundersimilarcomplexity.Itshowsgreatperformanceimprovementforcorrelatorsofsatellitenavigationsoftwarereceivers.

简介：Weaddnewmodulesforreceiverlunction(RF)analysisinSplitLabtoolbox,whichincludesthemanualRFanalysismodule,automaticRFanalysisandrelatedqualitycontrolmodules,andH-kstackingmodule.Theupdatedtoolbox(namedSplitRFLabtoolbox),especiallyitsautomaticRFanalysismodule,couldcalculatetheRFsquicklyandefficiently,whichisveryusefulinRFanalysiswithhugeamountofseismicdata.ChinaisnowconductingtheChinArrayprojectthatplanstodeploythousandsofportablestationsacrossChinesemainland.OurSplitRFLabtoolboxmayobtainreliableRFresultsquicklyatthefirsttime,whichprovideessentiallynewconstrainttothecrustalandmantlestructures.

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简介：在里面常规多乐队直角的频率部门multiplexing极端宽带(MB-OFDMUWB)接收装置，快Fourier变换(快速傅里叶变换)算法被昂贵、消费力量的数字信号处理器(DSP)认识到芯片。在这篇文章，更低的力量，更低的费用，和更低的复杂性即时模拟表面声学的波浪(锯)啁啾Fouriertransform设备被用来代替DSP部分。MB-OFDMUWB接收装置基于M-C-MSAWchirpFourier变换被介绍，并且从输入信号的信号转变的步也被描绘。当在环境由IEEE802.15SG3a建议了的隧道使用了时，模拟结果证明建议接收装置与充分数字的接收装置相比提供类似的位错误性能。

简介：新奇接收装置在这份报纸被建议使用盲目适应多用户察觉(泥)以高速度处理多重存取的干扰(MAI)和内部标志的干扰(ISI)的存在的技术跳跃时间极端宽带(TH-UWB)系统。接收装置第一采用抑制递归的最少的广场常数模量算法(RLS-CMA)为消除MAI和ISI进行适应decorrelation，然后使用设计近似subspace与放气(PASTd)追踪发射隧道评价的算法，做联合的最大的比率(MRC)并且加噪音比率(SINR)改进信号到干扰。建议接收装置能在所有四IEEE的UWB隧道下面很快去集中的模拟结果表演当模特儿，位错误比率(BER)性能比传统的接收装置和耙子接收装置的好。

简介：Inthispaper,wepresentathreedimensionalnumericalinvestigationofheattransferinaparabolictroughcollectorreceiverwithlongitudinalfinsusingdifferentkindsofnanofluid,withanoperationaltemperatureof573Kandnanoparticleconcentrationof1%involume.Theoutersurfaceoftheabsorberreceivesanon-uniformheatflux,whichisobtainedbyusingtheMonteCarloraytracingtechnique.Thenumericalresultsarecontrastedwithempiricalresultsavailableintheopenliterature.AsignificantimprovementofheattransferisderivedwhentheReynoldsnumbervariesintherange2.57×104≤Re≤2.57×105,thetube-sideNusseltnumberincreasesfrom1.3to1.8times,alsothemetallicnanoparticlesimproveheattransfergreatlythanothernanoparticles,combiningbothmechanismsprovidesbetterheattransferandhigherthermo-hydraulicperformance.

简介：Inthisarticle,weanalyzethecharactersofSV-componentreceiverfunctionofteleseismicbodywavesanditsadvantagesinmappingtheS-wavevelocitystructureofcrustindetail.Similartoradialreceiverfunction,SV-componentreceiverfunctioncanbeobtainedbydirectlydeconvolvingtheP-componentfromtheSV-componentofteleseismicrecordings.OuranalysesindicatethatthechangeofamplitudeofSV-componentreceiverfunctionagainstthechangeofepicentraldistanceislessthanthatofradialreceiverfunction.Moreover,thewaveformofSV-componentreceiverfunctionissimplerthantheradialreceiverfunctionandgivesprominencetothePSconvertedphasesthatarethemostsensitivetotheshearwavevelocitystructureintheinversion.ThesynthetictestsshowthattheconvergenceofSV-componentreceiverfunctioninversionisfasterthanthatoftheradialreceiverfunctioninversion.Asanexample,weinvestigatetheS-wavevelocitystructurebeneathHIAstationbyusingtheSV-componentreceiverfunctioninversionmethod.

简介：Thewide-swathmethodbasedonmulti-receiverisanovelandhighlyaccuratewide-swathmethod,whichrequiresaverypreciseviewangle.Theestimatedanglehaserrorbecauseoftheatmosphererefraction,angleerrorofviewandtargetheight.Amethodisproposedinthispapertoestimatetheangleerrorfromthereturnsignal.Themethodmakesuseoftherelationshipbetweentheviewangleerrorandthesignalcorrelationofthesubswathstoestimatetheangleerror.Theprecisionofthismethodisanalyzedbythelawofgreatnumberanditturnsouttobeindirectproportiontotherootsquarenumberofaveraging.Thesimulationresultisgivenandtheangleprecisionis0.025°.

简介：P-waveandS-wavereceiverfunctionanalyseshavebeenperformedalongaprofileconsistedof27broadbandseismicstationstoimagethecrustalanduppermantlediscontinuitiesacrossNortheastChina.TheresultsshowthattheaverageMohodepthvariesfromabout37kmbeneaththeDaxing’anlingorogenicbeltinthewesttoabout33kmbeneaththeSongliaoBasin,andtoabout35kmbeneaththeChangbaimountainregionintheeast.OurresultsrevealthattheMohoisgenerallyflatbeneaththeDaxing’anlingregionandaremarkableMohooffset(about4km)existsbeneaththebasin-mountainboundary,theDaxing’anling-TaihangGravityLine.BeneaththeTanlufaultszone,whichseperatestheSongliaoBasinandChangbairegion,theMohoisupliftandthecrustalthicknesschangesrapidly.WeinterpretthisfeatureasthattheTanlufaultsmightdeeplypenetrateintotheuppermantle,andfacilitatethemantleupwellingalongthefaultsduringtheCenozoicera.Theaveragedepthofthelithosphereasthenosphereboundary(LAB)is*80kmalongtheprofilewhichisthinnerthananaveragethicknessofacontinentallithosphere.TheLABshowsanarc-likeshapeinthebasin,withtheshallowestpartapproximatelybeneaththecenterofthebasin.TheupliftLABbeneaththebasinmightberelatedtotheextensivelithosphericstretchingintheMesozoic.Inthemantletransitionzone,astructurallycomplicated660kmdiscontinuitywithamaximum35kmdepressionbeneaththeChangbairegionisobserved.The35kmdepressionisroughlycoincidentwiththelocationofthestagnantwesternpacificslabontopofthe660kmdiscontinuityrevealedbytherecentPwavetomography.

简介：新接收装置被建议，它使用纤维在光代码分割的光参量的放大器(FOPA)在空间上的多重存取(OCDMA)眼(FSO)通讯系统。在这接收装置的表演索引被导出的噪音忍耐。接收装置不能仅仅改进噪音忍耐而且为在一个复杂、快速变化的天气条件下面适应编码顺序的长度变化方便地改变泵数据。噪音忍耐上的不同因素的影响被分析，并且当泵力量和编码顺序的长度是5W时，为噪音忍耐的大约18.77dB的重要改进能被完成并且256分别地。

简介：ThispaperpresentsanRFreceiverofzero-IntermediateFrequency(IF)architectureforCognitiveRadio(CR)communicationsystems.Zero-IFarchitecturereducetheimagerejectfilterandIFfilter,soitisexcellentinlowcost,compactvolume,andlowpowerdissipation.Thereceiveremploysthreedigitalattenuatorandahighgain,highlinearitylownoiseamplifiertoachievewidedynamicrangeof70dBandhighreceivingsensitivityof-81dBm.AfullybalancedI/QdemodulatorandadifferentialLocalOscillator(LO)chipsareusedtominimizethenegativeeffectscausedbysecond-orderdistortionandLOleakage.Inordertoselectan8MHz-channelfrom14continuousoneslocatedinUHFband(694-806MHz)accurately,approachofchannelselectivitycircuitsisproposed.TheRFreceiverhasbeendesigned,fabricated,andtest.Themeasuredresultshowsthatthenoisefigureis3.4dB,andtheerrorvectormagnitudeis7.5%whentheinputpoweris-81dBm.

简介：新涡轮反复的接收装置结构为uplink被建议多重输入的多重产量的直角的频率分割多重存取(MIMO-OFDMA)系统。轮流出现空间的概括期望最大化(半自动地面防空系统)算法自然地在反复的接收装置的框架被嵌入用涡轮察觉者产量执行同步和察觉。在每次重复，期望步打算移开多重存取另外的异步的用户引起的干扰(MAI)，和最大化步被利用估计要求的参数(即，预定偏移量，搬运人频率偏移量，隧道状态信息，等等)顺序为每个用户。模拟结果证明建议算法能仔细接近理想的接收装置的表演，当处理复杂性比常规察觉者相当低时。