Digital signal error vector magnitude testing method, digital signal error vector magnitude testing device and digital signal error vector magnitude testing system

Abstract

The invention discloses a digital signal error vector magnitude testing method, a digital signal error vector magnitude testing device and a digital signal error vector magnitude testing system, wherein the digital signal error vector magnitude testing method includes the following steps: filtering down-sampled digital signals to obtain digital signals to be tested; obtaining standard modulation signals corresponding to the digital signals to be tested; according to the standard modulation signals and the digital signals to be tested, determining the error vector magnitude deviation of each symbol of the digital signals to be tested, and according to the error vector magnitude deviation of each symbol and the standard modulation signals, determining error vector magnitude. Since the embodiment of the invention integrates the test and calculation of error vector magnitude, the efficiency of obtaining error vector magnitude can be increased.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of communications, and in particular to a digital signal error vector magnitude test method, device and system. Background technique [0002] Error Vector Magnitude (EVM for short) refers to the vector difference between the test waveform and the ideal modulation waveform, expressed by the root mean square of the ratio of the average error vector signal power to the average reference signal power. [0003] figure 1 is a schematic diagram of an existing wireless terminal baseband downlink structure, such as figure 1 As shown, after the antenna receives the high-frequency wireless communication signal, it enters the radio frequency (Radio Frequency; referred to as: RF) and down-converts it to a zero-IF analog signal, and the analog baseband (Analog Baseband; referred to as: ABB) performs modulus ( Analog Digital (abbreviation: AD) conversion, and digital baseband (Digital Baseband; ...

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a digital signal error vector magnitude test method, device and system, which are used to solve the defect of separation of EVM test and calculation in the prior art, realize the combination of EVM test and calculation, and improve the efficiency of obtaining EVM

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