Digital modulation quality parameter metering method and system based on setting of baseband constellation diagram

Abstract

The invention discloses a digital modulation quality parameter metering method and system based on the setting of a baseband constellation diagram, which are used for solving the problem that a VSA (vector signal analyzer) can not be accurately and completely calibrated because modulation errors can not be stably and accurately set and modulated. When the VSA is calibrated by the invention, the baseband constellation diagram is firstly configured according to the modulation mode and the target modulation error parameters; the constellation diagram is set in a VSG (vector signal generator), and the consistent modulation and demodulation parameters are set for the VSA and the VSG; and finally, the modulation errors are measured in the VSA, and the VSA is calibrated according to the difference value of the modulation errors which are obtained through the measurement with the preset modulation errors. In the invention, the standard signals which are generated based on the baseband constellation diagram are real vector modulation signals, and the modulation errors of the digital modulation signals which are emitted by the VSG can be stably and accurately set and adjusted based on the baseband constellation diagram, thus the integrity and accuracy of the VSA calibration are improved.

Description

technical field [0001] The invention relates to the measurement of digital modulation quality parameters and the calibration of vector signal analyzers. In particular, it relates to a digital modulation quality parameter measurement method and system based on a baseband constellation diagram setting. Background technique [0002] Vector modulation signal is the main carrier of information transmission in modern digital wireless communication systems. In the development and production of wireless communication products, Vector Signal Analyzer (Vector Signal Analyzer, VSA) and Vector Signal Generator (Vector Signal Generator, VSG) must be used ) to measure and test the transmitter and receiver parts respectively. To ensure accurate and reliable measurement and test results in the development and production of related products, the measurement accuracy of the instruments used must be fully guaranteed. One of the tasks of metrology is to trace the measured value of the actuall...

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Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide a digital modulation quality parameter measurement method and system based on the baseband constellation diagram setting, which is used to solve the problem of not being able to accurately set and adjust the modulation error due to the inability to stably and accurately set and adjust the vector signal analyzer. Issues with VSA doing a full calibration

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