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  • 1.
    Beek, Jaap van de
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    OFDM Spectral Precoding with Protected Subcarriers2013In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 17, no 12, p. 2209-2212Article in journal (Refereed)
    Abstract [en]

    A new precoder structure reduces an OFDM signal's out-of-band emission by tens of decibels while allowing a receiver to employ a classical OFDM channel estimator.

  • 2. Beek, Jaap van de
    Orthogonal multiplexing in a subspace of frequency well-localized signals2010In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 14, no 10, p. 882-884, article id 5558995Article in journal (Refereed)
    Abstract [en]

    multiplexing scheme onto K OFDM subcarriers arranges M ≤ K dimensions to shape the signal's transmit spectrum while the remaining K - M dimensions are used to orthogonally multiplex data symbols. This results in a new class of basis functions along with an equivalent precoder structure. In particular, N-continuous OFDM signals are realized as an orthogonal multiplex

  • 3. Beek, Jaap van de
    Sculpting the multicarrier spectrum: a novel projection precoder2009In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 13, no 12, p. 881-883Article in journal (Refereed)
    Abstract [en]

    A novel spectrum-sculpting precoder flexibly suppresses emitted power in predefined parts of the spectrum by tens of decibels. The precoder is particularly suitable in cognitive OFDM systems where the emitted signal's spectrum is adapted to time-varying reigning radio circumstances

  • 4. Beek, Jaap van de
    et al.
    Berggren, Fredrik
    Huawei Technologies Sweden.
    N-continuous OFDM2009In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 13, no 1, p. 1-3Article in journal (Refereed)
    Abstract [en]

    In this letter we report a new OFDM signalling format characterized by a precoder that renders the emitted signal's phase and amplitude continuous. It achieves superior outof- band power characteristics at the price of a slightly reduced receiver sensitivity

  • 5. Beek, Jaap van de
    et al.
    Berggren, Fredrik
    Huawei Technologies Sweden.
    Out-of-band power suppression in OFDM2008In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 12, no 9Article in journal (Refereed)
    Abstract [en]

    In this letter we show that judicious modulation of non-data subcarriers renders a transmitted OFDM signal and a few of its higher-order derivatives continuous at the OFDM symbol boundaries. This novel approach results in reduced out-of-band emission: typically, it achieves over 30 dB power suppression at adjacent-channel center-frequencies

  • 6.
    Lyamin, Nikita
    et al.
    Halmstad University, Sweden.
    Kleyko, Denis
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Computer Science.
    Quentin, Delooz
    Technische Hochschule Ingolstadt, Germany and Halmstad University, Sweden.
    Vinel, Alexey
    Halmstad University, Sweden.
    Real-time jamming DoS detection in safety-critical V2V C-ITS using data mining2019In: IEEE Communications Letters, ISSN 1089-7798, E-ISSN 1558-2558, Vol. 23, no 3, p. 442-445Article in journal (Refereed)
    Abstract [en]

    A data mining-based method for real-time detection of radio jamming Denial-of-Service (DoS) attacks in IEEE 802.11p vehicle-to-vehicle (V2V) communications is proposed. The method aims at understanding the reasons for losses of periodic cooperative awareness messages (CAM) exchanged by vehicles in a platoon. Detection relies on a knowledge of IEEE 802.11p protocols rules as well as on historical observation of events in the V2V channel. In comparison to the state-of-theart method, the proposed method allows operating under the realistic assumption of random jitter accompanying every CAM transmission. The method is evaluated for two jamming models: random and ON-OFF.

1 - 6 of 6
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