Effective AM/AM and AM/PM curves derived from EVM simulations or measurements on constellations

Effective AM/AM and AM/PM curves derived from EVM simulations or measurements on constellations

Non-linear amplifiers distort signal constellations through their amplitude (AM/AM) and phase (AM/PM) curves versus input amplitude. This causes an increase in the average Error Vector Magnitude (EVM) of the amplified signal. Most commercial EVM simulation software and measurement devices display th...

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Bibliographic Details
Published in:2022 99th ARFTG Microwave Measurement Conference (ARFTG) pp. 1 - 4
Main Author: Sombrin, Jacques B.
Format: Conference Proceeding
Language:English
Published: IEEE 24-06-2022
Subjects:
AM/AM
AM/PM
Computational modeling
EVM
Measurement uncertainty
Microwave measurement
non-linearity
Nonlinear distortion
Phase measurement
power amplifier
Software
Symbols
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Description
Summary:Non-linear amplifiers distort signal constellations through their amplitude (AM/AM) and phase (AM/PM) curves versus input amplitude. This causes an increase in the average Error Vector Magnitude (EVM) of the amplified signal. Most commercial EVM simulation software and measurement devices display the ideal and distorted constellations. When computing separate EVMs for each value of ideal symbol power, it is possible to obtain a representation of the effect of AM/AM and AM/PM curves on the constellation. A new type of display, with the distorted constellation folded up on the real axis, is proposed to get a direct representation of the amplifier non-linearity. This can also be used for nonlinear equalization of the signal to improve the EVM.
DOI:10.1109/ARFTG54656.2022.9896478