Calibrating transmit error vector magnitude using over-the-air loopback
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United States of America Patent
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Jan 9, 2018
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app pub date -
Feb 1, 2017
filing date -
Feb 3, 2016
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Abstract
Certain aspects relate to methods and apparatus for calibrating transmit error vector magnitude (EVM) using an over-the-air loopback mechanism. An apparatus includes a first radio frequency (RF) module configured to generate first RF signals based on first intermediate frequency (IF) signals and to output the first RF signals via at least a first antenna element, a second RF module configured to process the first RF signals, as obtained via a second antenna element, and to generate second IF signals, and a baseband module configured to determine a transmit performance metric for the first RF module based on the first IF signals and the second IF signals, determine a first transmit power level based on the determined transmit performance metric, and cause the first RF module to output second RF via the first antenna element at the first transmit power level.
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