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频谱分析仪测量和噪声AgilentSpectrumAnalyzerMeasurementsandNoiseApplicationNote1303MeasuringNoiseandNoise-likeDigitalCommunicationsSignalswithaSpectrumAnalyzerTableofContents333367889101214141416161819192020202020212223232324252728PartI:NoiseMeasurementsIntroductionSimplenoise―Baseband,Real,GaussianBandpassednoise―IandQMeasuringthepowerofnoisewithanenvelopedetectorLogarithmicprocessingMeasuringthepowerofnoisewithalog-envelopescaleEquivalentnoisebandwidthThenoisemarkerSpectrumanalyzersandenvelopedetectorsCautionswhenmeasuringnoisewithspectrumanalyzersPartII:MeasurementsofNoise-likeSignalsThenoise-likenatureofdigitalsignalsChannel-powermeasurementsAdjacent-ChannelPower(ACP)Carrierpower……