Spectral Effects of Discrete-Time Amplitude Levels in Digital-Intensive Wideband Radio Transmitters

Mikko Martelius, Kari Stadius, Jerry Lemberg, Enrico Roverato, Marko Kosunen, Jussi Ryynänen, Lauri Anttila, Mikko Valkama

    Tutkimustuotos: KonferenssiartikkeliScientificvertaisarvioitu

    2 Sitaatiot (Scopus)
    3 Lataukset (Pure)

    Abstrakti

    This paper examines one source of spectral degradation in polar and multilevel outphasing transmitters. The degradation is caused by the amplitude signal appearing at the transmitter output as a baseband component, in addition to the desired RF signal. This baseband component contains sampling images and quantization noise across the spectrum. Thus, it adds noise at the signal band where it cannot be filtered and limits the achievable ACLR, particularly in wideband LTE and 5G systems. We analyze the origin of this phenomenon and related effects of system and signal parameters, and propose three design solutions for eliminating or alleviating the problem. Our analysis and simulations demonstrate that using a voltage-subtracting power combiner cancels the described degradation, potentially leading to significant improvement in spectral performance.

    AlkuperäiskieliEnglanti
    Otsikko2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018
    KustantajaIEEE
    ISBN (elektroninen)9781538648810
    DOI - pysyväislinkit
    TilaJulkaistu - 26 huhtik. 2018
    OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
    TapahtumaIEEE International Symposium on Circuits and Systems - Florence, Italia
    Kesto: 27 toukok. 201830 toukok. 2018

    Julkaisusarja

    Nimi
    ISSN (elektroninen)2379-447X

    Conference

    ConferenceIEEE International Symposium on Circuits and Systems
    Maa/AlueItalia
    KaupunkiFlorence
    Ajanjakso27/05/1830/05/18

    Julkaisufoorumi-taso

    • Jufo-taso 1

    !!ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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