EVM: The Heart of Everything Wireless
应用文章
Want to achieve greater data capacity? Optimize signal-to-noise ratio (SNR).
Want to increase power efficiency? Improve your digital predistortion algorithm.
Want to increase your communication signal’s power? Minimize the wideband distortion.
How are all these connected? Error vector magnitude, or EVM.
To optimize SNR, first look in-band. By definition, EVM is the measure of in-band SNR. Improving your digital predistortion algorithm improves signal linearity, which in turn improves EVM. At the core of characterizing and minimizing wideband distortion is a traditionally challenging and expensive residual EVM measurement.
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