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(上接第15期)3S/N测量3.1引言本测量方法适用于采用PSK,QAM格式的数字调制信噪比(S/N或SNR)测量。由于调制信号类似于频道带宽内分配的噪声,本测量以使用适当的频谱分析仪为基础,频谱仪应能够调谐到被测频道的频率范围,并且显示全部带宽,也可以使用矢量信号分析仪。在加到被测
(On the 15th) 3S / N measurement 3.1 Introduction This measurement method is applicable to the digital modulation signal-to-noise ratio (S / N or SNR) measurement using PSK, QAM format. Since the modulated signal is similar to the noise distributed in the channel bandwidth, the measurement should be based on an appropriate spectrum analyzer that should be able to tune to the frequency range of the channel under test and show the full bandwidth, as well as a vector signal analyzer. Added to the test