Method and system for metering digital demodulating error parameter based on amplitude modulation method or phase modulation method

Abstract

The present invention discloses a method and a system for metering a digital demodulating error parameter based on an amplitude modulation method or a phase modulation method, wherein the metering method can comprise the following steps: generating an amplitude modulation (AM) signal the carrier frequency of which is the summation or the subtraction of a first frequency and a second frequency and the amplitude modulation frequency of which is a third frequency and an amplitude modulation depth D, wherein the first frequency is larger than the second frequency; the second frequency is over 30 times than the third frequency; VSA sample sequence persistence length is equal to integral multiple of amplitude period; using the generated AM signal as an equivalent digital modulation signal input to the input end of a VSA, wherein the carrier frequency of the VSA is set to be the first frequency; a demodulating mode is set to be MPSK; the symbol rate is set to be M times of the second frequency; and the error parameter of the equivalent MPSK signal is calculated. The error parameter which is generated by the method and used for correcting the equivalent digital modulation signal of the VSA can be precisely set and calculated, thus the invention can simultaneously solve two problems of the parameter traceability of the digital demodulating error parameter and error setting.

Description

technical field [0001] The invention relates to the measurement of digital demodulation error parameters, in particular to a digital demodulation error parameter measurement method based on amplitude modulation or phase modulation method and a digital demodulation error parameter measurement system. Background technique [0002] At present, digital modulation signals are the main carrier of information transmission and have become an important cornerstone of the information society. Among them, error vector magnitude root mean square value (hereinafter referred to as EvmRms), error vector magnitude peak value (hereinafter referred to as EvmPeak), amplitude error root mean square value (hereinafter referred to as MagErrRms), amplitude error peak value (hereinafter referred to as MagErrPeak), phase error mean square The root value (hereinafter referred to as PhaseErrRms) and the phase error peak value (hereinafter referred to as PhaseErrPeak) are important error parameters to ...

AI Technical Summary

Problems solved by technology

That is to say, the error parameters obtained by the current digital modulation error parameter measurement are not traceable, which makes it difficult to ensure the accuracy and reliability of the measurement process

[0004] 2. The digital modulation signal used to calibrate VSA lacks the setting of error parameters

However, the current calibration method does not set the error parameter, which deviates from the practical requirements of digital modulation error parameter measurement

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