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Agnostic Envelope Linearization of Dynamically Supplied Power Amplifiers for Mobile Terminals.

Wantao Li1, Gabriel Montoro1, Pere L Gilabert1

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Summary

This study introduces an envelope optimization (EOPT) technique for linearizing envelope tracking (ET) power amplifiers (PAs) in 5G mobile devices. The method effectively reduces nonlinear distortion without output monitoring, ensuring 5G NR linearity and high power efficiency.

Keywords:
RF leakagedigital predistortionenvelope trackingpower amplifier

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Area of Science:

  • Electrical Engineering
  • Wireless Communications
  • Signal Processing

Background:

  • Envelope tracking (ET) power amplifiers (PAs) are crucial for 5G new radio (NR) mobile terminals.
  • Nonlinear distortion in ET PAs degrades signal quality and impacts adjacent channel power ratio (ACPR).
  • Existing linearization techniques often require output monitoring, increasing system complexity.

Purpose of the Study:

  • To propose a novel envelope linearization technique, envelope optimization (EOPT), for ET PAs in 5G NR mobile terminals.
  • To address nonlinear distortion without requiring output monitoring at the envelope tracking modulator (ETM).
  • To validate the EOPT method's performance and efficiency on a system-on-chip (SoC) ET PA.

Main Methods:

  • The EOPT method utilizes an envelope generalized memory polynomial (EGMP) behavioral model for linearization.
  • An iterative nonlinear least squares solution, inspired by the deep deterministic policy gradient (DDPG) algorithm, is employed to extract EGMP model coefficients.
  • The technique is validated on a dedicated SoC ET PA board using 5G NR test signals.

Main Results:

  • The EOPT method successfully compensated for nonlinear distortion in the ET PA.
  • Achieved adjacent channel power ratio (ACPR) below -36 dBc with 16.8% power efficiency for 60 MHz 5G NR signals at 2.55 GHz.
  • Linearization performance is comparable to envelope leakage cancellation (ELC) but avoids the need for an analog-to-digital converter (ADC).

Conclusions:

  • The proposed EOPT method effectively linearizes ET PAs for 5G NR mobile terminals.
  • The technique offers a power-efficient solution that meets stringent linearity requirements.
  • EOPT provides a competitive alternative to existing linearization methods, simplifying system design by eliminating the need for ETM output monitoring.