简介:当前,简易数字信号传输性能分析仪得到了市场的广泛认可与应用,其是数字通信系统设计和检测设备中的最佳通信测试仪器之一,在数字传输系统的工程施工和日常维护过程中发挥着重要的作用。本文所提及的简易数字信号传输性能分析仪的设计是以STM32F103微处理器为技术支持,从而实现了系统的设计、实现与仿真,为进一步提高简易数字信号传输性能分析仪的功能性提供了可能。
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简介:广泛的室内的隧道大小与宽带在北京被进行多重输入多重产量(MIMO)在5.25GHz更健全。line-of-sight(LOS)和non-line-of-sight(NLOS)繁殖在室内的办公室和热点情形里被测量。根据测量数据,统计隧道特征在这篇文章被介绍,包括损失(PL)建模的实验路径,三个过量延期参数,圆形的方位角传播(CAS),和圆形的举起传播了(CES)。在二种情形的不同繁殖机制的比较分析被进行。这些值为国际活动电信进展(IMT进展)为室内的范围和MIMO和直角的频率部门multiplexing(OFDM)的技术研究是重要的系统。
简介:Withrapiddevelopmentcommunicationsystem,highsignaltonoiseratio(SNR)systemisrequired.Inhighfrequencybandwidth,highloss,lowQinductorsandhighnoisefigureisasignificantchallengewithon-chipmonolithicmicrowaveintegratedcircuits(MMICs).Toovercomethisproblem,highQ,lowlosstransmissionlinecharacteristicswasanalyzed.Comparedwiththesameinductorvalueofthelumpedcomponentandthetransmissionline,ithasahigherQvalueandlowerlossperformanceinhighfrequency,anda2-stagecommon-sourcelownoiseamplifier(LNA)waspresented,whichemployssourceinductorfeedbacktechnologyandhighQlowlosstransmissionlinematchingnetworktechniquewithover17.6dBsmallsignalgainand1.1dBnoisefigurein15GHz–18GHz.TheLNAwasfabricatedbyWINsemiconductorscompany0.15μmgalliumarsenide(GaAs)Phighelectronmobilitytransistor(P-HEMT)process.Thetotalcurrentis15mA,whiletheDCpowerconsumptionisonly45mW.
简介:Afullydifferentialcomplementarymetaloxidesemiconductor(CMOS)lownoiseamplifier(LNA)for3.1–10.6GHzultra-wideband(UWB)communicationsystemsispresented.TheLNAadoptscapacitivecross-couplingcommon-gate(CG)topologytoachievewidebandinputmatchingandlownoisefigure(NF).Inductiveseries-peakingisusedfortheLNAtoobtainbroadbandflatgaininthewhole3.1–10.6GHzband.Designedin0.18μmCMOStechnology,theLNAachievesanNFof3.1–4.7dB,anS11oflessthan–10dB,anS21of10.3dBwith±0.4dBfluctuation,andaninput3rdinterceptionpoint(IIP3)of–5.1dBm,whilethecurrentconsumptionisonly4.8mAfroma1.8Vpowersupply.ThechipareaoftheLNAis1×0.94mm2.
简介:Inthisarticle,resultsobtainedfromwidebandmultiple-inputmultiple-outputchannelmeasurementsat4.9GHzarepresented.Measurementswereperformedinanindoorhotspotscenariowithbothline-of-sightandnon-line-of-sightpropagationconditions.Verticalpolarizeduniformlineararrays(ULAs)withdifferentantennaspacingandorientationwereutilizedforinvestigatingtheimpactofantennaconfigurationsonthesystemperformance.Basedonmeasuredchannelimpulseresponses,thespatialcorrelationofULAisanalyzedandcomparedwiththetheoreticalvaluescalculatedfromthepowerazimuthspectrum.Followingthat,theeigenvaluestatisticsandcapacitywithrespecttoantennaspacingandorientationaregivenandcompared.Thediversity-multiplexingtradeoff(DMT)ofmeasuredchannelsatoperationalsignal-to-noiseratio(SNR)isalsopresented.ThereasonwhytheDMTofmeasuredchannelsismuchlowerthanthatofi.i.d.Rayleighchannelsisspecified.
简介:Arraygainwouldbewellexploitedtoimprovepowercoverageifsomepowerfulmultipathcomponentsfromdifferentradiolinkscancoherentlycombineatthereceiver(Rx).Thus,inthispaper,analgorithmisproposedfortransmissioninsimulcastsystem,wherepartialchannelstateinformation(CSI)isneeded.Basedonmeasuredmultipathchannel,performanceoftheproposedalgorithmisevaluated.Accordingtosimulationresults,theproposedalgorithmoutperformsthedirectionsummation(DS)schemeandmultipathantennadiversity(MAD)algorithm,with2~4dBadvantageoverthelatters.Especiallyinlineofsight(LOS)scenario,theadvantageismoreobvious.Besides,theproposedalgorithmbringsmoregainwithincreasingnumberoftransmitantennaswithoutadditionalpower.Finally,robustnessoftheproposedalgorithmisexaminedwithimperfectCSI.