Digital predistortion for envelope-tracking power amplifiers using decomposed piecewise volterra series

Anding Zhu*, Paul J. Draxler, Chin Hsia, Thomas J. Brazil, Donald F. Kimball, Peter M. Asbeck

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

151 Scopus citations

Abstract

Due to dynamic changes of supply voltage, envelope-tracking (ET) power amplifiers (PAs) exhibit very distinct characteristics in different power regions. It is very difficult to compensate the distortion induced by these amplifiers by employing conventional digital predistortion techniques. In this paper, by introducing a new piecewise Volterra model based on a vector threshold decomposition technique, we first set several thresholds in the input power level according to the PA characteristics, and decompose the input complex envelope signal into several sub-signals by using these thresholds. We then process each sub-signal separately by employing the dynamic deviation reduction-based Volterra series, and finally recombine them together to produce the predistorted output. Experimental results show that by using this new decomposed piecewise digital predistorter model, the distinct characteristics of the ET system at different signal power levels can be accurately modeled, and thus, the distortion, including both static non-linearities and memory effects, caused by the amplifier nonlinear behavior can be effectively compensated.

Original languageEnglish
Article number4631463
Pages (from-to)2237-2247
Number of pages11
JournalIEEE Transactions on Microwave Theory and Techniques
Volume56
Issue number10
DOIs
StatePublished - 10 2008
Externally publishedYes

Keywords

  • Behavioral modeling
  • Envelope tracking (ET)
  • Linearization
  • Power amplifier (PA)
  • Predistorter
  • Volterra series

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