Nonlinear Digital Cancellation in Full-Duplex Devices using Spline-Based Hammerstein Model

Pablo Pascual Campo, Dani Korpi, Lauri Anttila, Mikko Valkama

    Tutkimustuotos: KonferenssiartikkeliScientificvertaisarvioitu

    8 Sitaatiot (Scopus)
    14 Lataukset (Pure)

    Abstrakti

    In this paper, a novel digital self-interference canceller based on a Hammerstein adaptive filter is proposed and examined. The proposed system consists of a spline-interpolated lookup table to model the nonlinear power amplifier, followed by a linear filter accounting for the impulse response of the linear self-interference channel. The gradient descent based parameter learning algorithms are derived, which estimate the spline control points and the filter coefficients in a decoupled manner. The proposed digital canceller leads to a complexity reduction of 77% when compared to the existing state-of-the-art solutions. Performance evaluations using measured data from a complete inband full-duplex prototype system operating at 2.4 GHz ISM band show the effectiveness of the proposed technique, demonstrating that it obtains similar cancellation performance as the existing state-of-the-art canceller, regardless of its lower complexity. The measured digital self-interference cancellation values are 45 dB, 43 dB and 38 dB with 20 MHz, 40 MHz and 80 MHz channel bandwidths, respectively. These results indicate that the complexity-accuracy trade-off of the proposed decoupled spline-based cancellation approach is very favorable. Owing to the resulting decrease in the computational complexity, the proposed digital cancellation technique brings inband full-duplex transceivers one step closer to commercial deployments.
    AlkuperäiskieliEnglanti
    Otsikko2018 IEEE Globecom Workshops (GC Wkshps)
    KustantajaIEEE
    ISBN (elektroninen)978-1-5386-6977-8
    ISBN (painettu)978-1-5386-4920-6
    DOI - pysyväislinkit
    TilaJulkaistu - 2018
    OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
    TapahtumaIEEE Globecom Workshops -
    Kesto: 1 tammik. 2000 → …

    Conference

    ConferenceIEEE Globecom Workshops
    Ajanjakso1/01/00 → …

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