简介：未预见到的活动数据爆炸象一样光谱资源姿势少见对今天的性能的主要挑战在新奇解决方案的迫切需要处理如此的多卷的活动数据的细胞的网络。长期进化放纵(LTE-U)，它扩大给没有执照的乐队动手术的LTE标准，被建议了改进系统产量。在LTE-U系统，到达用户们将与无线忠实(WiFi)竞争放纵的光谱资源播送数据信息的用户。不过，至于用为LTE用户的没有执照的乐队的传播的好处没有清楚的一致。到这个目的，在这份报纸，一个分析模型基于一个队列系统被介绍理解考虑服务(QoS)和LTE-U用户行为的质量的放纵的基于的LTE系统完成的性能。获得队列系统的替代状态答案，一个矩阵几何方法被用来解决它。然后，为LTE-U用户的没有执照的乐队的平均延期和利用被使用排队模型导出。LTE-U共存的表演用建议模型与WiFi被评估并且在实践至于LTE-U的优点提供一些起始的卓见。

简介：Globalpositioningsystem(GPS)forvehicleapplicationsintheurbanareaischallengedbylowsignalintensity.ThecarrierloopbasedonfastFouriertransform(FFT)canobtainahighsignaltonoiseratio(SNR)gainbyincreasingtheobservationtime.However,thisleadstoamajorproblemthattheaccelerationcannotbeignored.TheperformanceoftheFFT-basedloopwilldeclinewiththeaccelerationincreasing.ThispaperdiscussestheeffectofthedynamiconFFTfirst.ThenahighperformancecarriertrackingloopforweakGPSL5signalsisproposed.Itcombinesdiscretechirp-Fouriertransform(DCFT)andthephasefittingmethodtoestimateDopplerfrequencyandDopplerratesimultaneously.First,asequenceofintegrationresultsisusedtoperformDCFTtoestimatecoarseDopplerfrequencyandDopplerrate.Second,thephaseofthesequenceiscalculatedandusedtoperformlinearfitting.Bythephasefittingmethod,thefineDopplerfrequencyandDopplerratecanbeestimated.ThecomputationcostissmallbecausetheintegrationresultsareusedandthephasefittingmethodneedsonlycoarseestimatesofDopplerfrequencyandDopplerrate.ComparedwithFFTandDCFT,theprecisionofthephasefittingmethodisnotlimitedbytheresolution.Thustheproposedloopcangethighprecisionandlowcarriertonoiseratio(C/N0)trackingthreshold.Simulationresultsshowthisloophasagreatimprovementthanconventionalloopsforurbanweak-signalapplications.

简介：A2D-directionofarrivalestimation(DOAE)formultiinputandmulti-output(MIMO)radarusingimprovedmultipletemporal-spatialsubspacesinestimatingsignalparametersviarotationalinvariancetechniquesmethod(TS-ESPRIT)isintroduced.InordertorealizetheimprovedTS-ESPRIT,theproposedalgorithmdividestheplanararrayintomultipleuniformsub-planararrayswithcommonreferencepointtogetaunifiedphaseshiftsmeasurementpointforallsub-arrays.TheTS-ESPRITisappliedtoeachsub-arrayseparately,andinthesametimewiththeotherstorealizetheparallellytemporalandspatialprocessing,sothatitreducesthenon-linearityeffectofmodelanddecreasesthecomputationaltime.Then,thetimedifferenceofarrival(TDOA)techniqueisappliedtocombinethemultiplesub-arraysinordertoformtheimprovedTS-ESPRIT.Itisfoundthattheproposedmethodachieveshighaccuracyatalowsignaltonoiseratio(SNR)withlowcomputationalcomplexity,leadingtoenhancementoftheestimatorsperformance.

简介：12月6日，希捷科技旗下的高端品牌LaCie在北京举办“LaCie，畅想创作之美”智慧媒体存储解决方案暨新品发布会，发布了专门面向专业媒体人士的新一代产品——LaCie2bigDockThunderbolt3，为广大摄影师、视频制作人等媒体工作者提供超大容量、超快速度的两盘位RAID存储，优化创意工作流。

简介：UnipolarresistiveswitchingbehaviorsoftheZnOandAl2O3/ZnOfilmsfabricatedonflexiblesubstratesbypulselaserdepositionwerestudiedinthispaper.Thefilmsweredepositedatroomtemperaturewithoutpost-annealingtreatmentduringtheprocess.XraydiffractionresultsindicatedthatZnOfilmhasadominantpeakat(002).ScanningelectronmicroscopyobservationshowedacolumnargrainstructureoftheZnOfilmtothesubstrate.ThebilayerdeviceofAl2O3/ZnOfilmshadstableresistiveswitchingbehaviorswithagoodenduranceperformanceofmorethan200cycles,highresistiveswitchingratioofover103atareadvoltageof0.1V,whichisbetterthanthatofthesingleoxidelayerdeviceofZnOfilm.Apossibleresistiveswitchingfilamentarymodewasdemonstratedinthispaper.TheconductionmechanismsofhighandlowresistancestatescanbeexplainedbyspacechargelimitedconductionandOhmic’sbehaviors.Theenduranceofthebilayer(BL)devicewasnotdegradeduponbendingcycles,whichindicatesthepotentialoftheflexibleresistiveswitchingrandomaccessmemoryapplications.

简介：Qorvo推出满足LTE2级功率要求的RF前端产品组合，也称作高性能用户设备（HPUE）。集成QorvoRFFE设备的智能手机可兼具高频段频谱的速度与容量优势和中频段频谱的覆盖范围优势。

简介：在2016年NAB展览会上,索尼专业推出了4K摄影机新品PXW-FS7M2（下称FS7M2）。作为FS7的升级版,FS7M2增加了无级可调电子ND系统、锁杆型E卡口镜头座、可直接拍摄4K标准色域BT2020、手柄延长臂调整方式改进、标配显示屏遮光罩、增加了电源LED灯等功能,可以看出索尼在FS7M2的细节改进上是非常用心的,充分汲取了大家对前代FS7的使用经验，瞄准痛点，精确改进。DVClub产品测评室就着重为大家测试FS7M2的新亮点。

简介：本文探讨了M~2W型中波发射机自动控制系统的硬件设计原理。