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Calibration standards for digital modulation error based on CW, AM or PM signal

机译:基于CW,AM或PM信号的数字调制误差的校准标准

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Digital modulation signal is the main bearer of modern information transmission; modulation error parameters include Error Vector Magnitude (EVM), MagErr and PhaseErr. However, there are problems for metrology of digital modulation error: first, the signal source and vector signal analyzers calibrates each other, and forms a closed-loop, the calibration is not traceable. Second, digital modulation error are set in the “0” point in calibration. To solve the problems, we propose a new method: use combination of two CW, analog AM or PM signal, to construct an “equivalent MPSK signals” with certain modulation error. The equivalent MPSK signals'' EvmRms, EvmPeak, MagErrRms, MagErrPeak, PhaseErrRms and PhaseErrPeak is are solely decided by power ratio of two CW, or by AM depth or PM phase deviation, and can be calculated accurately, and are continuously adjustable within a wide range. Experiment shows that the method is effective. This has established a standard signal with digital modulation error, it''s could be used to calibrate vector demodulation functions of vector signal analyzer (VSA) and wireless communications tester.
机译:数字调制信号是现代信息传输的主要载体。调制误差参数包括误差矢量幅度(EVM),MagErr和PhaseErr。但是,数字调制误差的度量存在一些问题:首先,信号源和矢量信号分析仪会相互校准,并形成闭环,因此无法追溯校准。其次,在校准的“ 0”点设置数字调制误差。为了解决这些问题,我们提出了一种新方法:使用两个连续波(模拟AM或PM信号)的组合来构造具有一定调制误差的“等效MPSK信号”。等效的MPSK信号''EvmRms,EvmPeak,MagErrRms,MagErrPeak,PhaseErrRms和PhaseErrPeak完全由两个CW的功率比或AM深度或PM相位偏差决定,并且可以精确计算,并且可以在很宽的范围内连续调节范围。实验表明该方法是有效的。这建立了具有数字调制误差的标准信号,可用于校准矢量信号分析仪(VSA)和无线通信测试仪的矢量解调功能。

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