The Complete Guide to Troubleshoot and Fine Tune Digital Predistortion

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  • Author: Wangning Ge

Digital predistortion (commonly known as DPD) is an algorithm widely used in
wireless communication systems. DPD’s purpose is to suppress the spectral
regrowth on the wide-band signal that is passed through the radio frequency
power amplifier (PA),1 thereby improving the PA’s overall efficiency. In general,
PAs have nonlinear effects and inefficiency when dealing with high power input
signals. The nonlinear effect and the spectral interference's are caused by
the spectral regrowth to the neighbor bands.

This article describes the digital predistortion (DPD) function for the ADRV9002.
Some of the debugging techniques used can also be applied to general DPD
systems. First, background information on DPD is outlined along with some of
the typical issues users may encounter when experimenting with their system.
Lastly, it describes tuning strategies that can be applied to the DPD algorithm
with the help of a DPD software tool to analyze performance.

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