Power consumption trade-off between power amplifier OBO, DPD, and clipping and filtering

Sandrine Boumard, Mika Lasanen, Olli Apilo, Atso Hekkala, C. Cassan, J.-P. Verdeil, J. David, L. Pichon

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    5 Citations (Scopus)

    Abstract

    This paper investigates the trade-off between power amplifier (PA) nonlinearity, output power backoff (OBO), digital predistortion (DPD), and clipping and filtering (CF) in terms of energy consumption. The energy efficiency of a PA depends on the OBO of the signal and usually increases as the OBO decreases. Peak to average power ratio (PAPR) reduction methods like CF and PA linearization algorithms like DPD methods allow the use of a smaller OBO. Those algorithms show best results when used together. By studying the trade-off between the power consumed in the CF and DPD circuits versus having a larger OBO for a target bit-error rate (BER), we show that below a certain PA output power the power consumption is not reduced by decreasing the OBO. We also show that the increase in distortion noise when using DPD and CF might defeat the purpose of their use in terms of power consumption. Given the trend toward smaller cells like femtocells, requiring less output power, CF and DPD may not be required at all, leading to a simpler and power saving transmitter design.
    Original languageEnglish
    Title of host publicationProceedings
    Subtitle of host publication26th International Teletraffic Congress, ITC 2014
    PublisherIEEE Institute of Electrical and Electronic Engineers
    Number of pages5
    ISBN (Print)978-0-9883045-0-5
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA4 Article in a conference publication
    Event26th International Teletraffic Congress, ITC 26 - Karlskrona, Sweden
    Duration: 9 Sep 201411 Sep 2014
    Conference number: 26th

    Conference

    Conference26th International Teletraffic Congress, ITC 26
    Abbreviated titleITC 26
    Country/TerritorySweden
    CityKarlskrona
    Period9/09/1411/09/14

    Keywords

    • distortation
    • power amplifirs
    • temtocellular radio
    • digital predistortion
    • peak-to-average-power ratio
    • power efficiency

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