Dynamic Range by Design in OTA EVM measurements

Published by National Institute of Standards and Technology | National Institute of Standards and Technology | Metadata Last Checked: August 02, 2025 | Last Modified: 2023-04-22 00:00:00

We present an experimental approach to design an over-the-air (OTA) millimeter-wave system for measuring error vector magnitude (EVM) with associated uncertainties that include correlations and nonlinearities. Our approach uses a variable waveguide attenuator at the output of a modulated-signal source at 44 GHz and provides traceable measurements on a calibrated equivalent-time sampling oscilloscope. The conductor-based EVM measurements and associated uncertainties presented here serve as a baseline for the eventual OTA-based EVM. We also discuss a noise based EVM estimation technique as a simple tool for planning OTA EVM measurements, but without a complete knowledge of measurement uncertainties.

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Complete Metadata

bureauCode	[ "006:55" ]
identifier	ark:/88434/mds2-2938
issued	2024-01-03
landingPage	https://data.nist.gov/od/id/mds2-2938
language	[ "en" ]
programCode	[ "006:045" ]
theme	[ "Advanced Communications:Wireless (RF)" ]