Error vector magnitude measurement device and method

Abstract

The invention provides an error vector magnitude measurement device and method. The error vector magnitude measurement method comprises the steps of: 1, carrying out constellation point judgment on acquired receiving constellation points so as to determine ideal constellation points corresponding to the receiving constellation points; 2, carrying out vector division on the ideal constellation points and the receiving constellation points to obtain channel estimation corrected values; 3, repeating the steps 1 and 2, and then aiming at one sub-carrier, carrying out averaging on all the channel estimation corrected values to obtain an average value of the channel estimation corrected values of one sub-carrier; 4, repeating the steps 1, 2 and 3, and obtaining respectively corresponding average values of the channel estimation corrected values of all the sub-carriers; 5, carrying out vector multiplication on the receiving constellation points in the step 1 and the corresponding average values of the channel estimation corrected values to obtain corrected receiving constellation points; and 6, by the ideal constellation points and the corrected receiving constellation points, carrying out error vector magnitude calculation. The EVM (Error Vector Magnitude) measurement method based on feedback decision, which is disclosed by the invention, can overcome influence on EVM measurement, which is caused by channel estimation inaccuracy, and improve accuracy of EVM measurement.

Description

technical field [0001] The invention belongs to the field of wireless communication, in particular to a device and method for measuring error vector magnitude. Background technique [0002] In modern wireless communication systems, due to the modulation error of the modulator, the quality of the radio frequency device cannot reach the ideal situation, the noise of the phase-locked loop, Gaussian white noise and the change of the system design scheme and even the ambient temperature, the digital modulation signal actually received by the receiving end There are certain differences in amplitude, phase, and frequency from the ideal signal, and these differences appear as differences in amplitude and phase between the measured signal and the standard constellation point on the I / Q plane. [0003] Error Vector Magnitude (EVM), which characterizes the modulation accuracy, is a key indicator to measure the quality of digital modulation in wireless communication systems. The error ...

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Problems solved by technology

[0010] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a device and method for measuring error vector magnitude, which is used to solve the problem of inaccurate EVM measurement results caused by inaccurate channel estimation in the prior art

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