Novel digital compensation approaches for envelope tracking amplifiers

Atso Hekkala (Corresponding Author), Adrian Kotelba, Mika Lasanen, Pertti Järvensivu, Aarne Mämmelä

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)

    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.
    Original languageEnglish
    Pages (from-to)55-77
    Number of pages23
    JournalWireless Personal Communications
    Volume62
    Issue number1
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Adaptive compensation
    • Polynomial predistorter
    • Predistorter architecture
    • Time misalignment

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