最新LTE 射频测试及仪器仪表课件PPT.ppt

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1、LTE射频测试及仪器仪表3GPPTimeline3GPP标准版本时间表InnovationsonLTERFTechnologyLTE射频技术的革新OFDMModulationOFDM调制方式SmartAntenna智能天线MIMO多输入多输出+Freq–FreqBandwidthExtensionApplicationofSpaceDivisionandEqualizationInPhaseRealPartQuadraturePhaseImaginaryPartSignalAModulationDescriptionTool-VectorChart调制的描述－矢

2、量图V(t)=A(t)*Sin(2fct+(t))=A(t)Cos(t)Sin(2fct)+A(t)Sin(t)Cos(2fct)RFsignalcanberepresentasaVectoratanytimepoint任意时间点RF信号可以表示为一个矢量TrailofthevectordescribesthetimevariantRFmodulationsignal矢量变化的轨迹可描述时变RF调制信号90oRFModSignal矢量调制信号fcMixerQ(t)=A(t)Sin(t)IQModulation–RFARBWaveFormGenerato

3、rIQ调制–RF任意波形发生器I(t)=A(t)Cos(t)MixerA(t)Cos(t)Sin(2fct)A(t)Sin(t)Cos(2fct)D/AD/AQ(n)I(n)FromAnalogtoDigital从模拟到数字0degIQ180degAtSampleTimePoints，SignalPossibleVectorPoints采样时间点，信号可能的矢量点AtTransitionTime，SignalTransitionTrace转换时间，信号转换轨迹BPSKDQPSKandQPSKDQPSK16QAMMSK32QAM8PSKConst

4、ellation星座图RFVSA－TestResponseofRFSignalRF矢量信号信号分析仪－RF信号响应测试RFSignalPowerResponseTest射频信号功率响应测试RFSignalSpectrumResponseTest射频信号频谱响应测试RFSignalModulationQualityResponseTest射频信号调制质量响应测试FrequencyAmplitudeTime90oPhaseShift2sin2fctQuadratureComponentIn-PhaseIncidentDemodCondition：fc=fLO.x1(t

5、)=2MQAM(t)xsin2fct=[I(t)sin2fct+Q(t)cos2fct]2sin2fct=I(t)-I(t)cos4fct+Q(t)sin4fctx2(t)=Q(t)+Q(t)cos4fctt+I(t)sin4fcts(t)=I(t)sin2fct+Q(t)cos2fctfforx2(t)x1(t)2cos2fctLORFSignal=tan-1ImagRealA=RealImag+22IQDemod–VectorSignalAnalyzeIQ解调–矢量信号分析Trigger，ControlRFResponseTestBased

6、onIQ基于IQ的RF响应测试A/DA/DI(t)Q(t)Q(n)I(n)MemorySpaceCPUDSPFPGATimeDomainProcessFFT&FreqDomainProcessDemodulationProcessRFSignalPowerResponseTest射频信号功率响应测试RFSignalSpectrumResponseTest射频信号频谱响应测试RFSignalModulationQualityResponseTest射频信号调制质量响应测试FundamentalRequirementon3GLTERFTest13GLTE对基本射频测试

7、仪器的基本需求1FrequencyRangeandRFChannelBandwidth频率范围和射频信道带宽RefertoTechTrendFundamentalRequirementon3GLTERFTest23GLTE对基本射频测试仪器的基本需求2EmulationofMulti-Stream&ChannelResponse多通道和信道响应模拟Signal=S1(t)H1(t)+S2(t)H2(t)+…+Sn(t)Hn(t)S–SignalStreamH–ChannelResponseVSGwithARBGeneralorDedicateWav