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Novel Digital Compensation Approaches for Envelope Tracking Amplifiers

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Abstract

This paper considers the compensation of the envelope tracking (ET) amplifier. In particular, we propose a new predistortion architecture for the ET amplifier. In addition, we develop new algorithms for time misalignment compensation between the input signals of the ET amplifier and compare the methods to a previously presented method. Our results indicate that using the proposed architecture with optimal predistorter, we achieve over 40 dB better adjacent channel power than using a previously presented architecture. In addition, the time misalignment compensation methods give very accurate timing estimates. The time misalignment compensation with the predistortion reduces spectral regrowth due to the nonlinear ET amplifier and improves the power efficiency of the ET amplifier.

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Authors and Affiliations

  1. VTT Technical Research Centre of Finland, P.O. Box 1100, 90571, Oulu, Finland

    Atso Hekkala, Adrian Kotelba, Mika Lasanen, Pertti Järvensivu & Aarne Mämmelä

Authors
  1. Atso Hekkala
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  2. Adrian Kotelba
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  3. Mika Lasanen
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  4. Pertti Järvensivu
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  5. Aarne Mämmelä
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Corresponding author

Correspondence to Atso Hekkala.

Additional information

Parts of this paper reprinted, with permission, from the IEEE International Symposium on Spread Spectrum Technologies and Application, Bologna, Italy, August, 2008 and the IEEE Personal, Indoor, and Mobile Communication Symposium, Cannes, France, September, 2008. ©IEEE 2008.

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Hekkala, A., Kotelba, A., Lasanen, M. et al. Novel Digital Compensation Approaches for Envelope Tracking Amplifiers. Wireless Pers Commun 62, 55–77 (2012). https://doi.org/10.1007/s11277-010-0038-0

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  • DOI: https://doi.org/10.1007/s11277-010-0038-0

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