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    Item type:Publication, Access status: with files ,
    Acoustic backscatter communication in metal structures
    (2024)
    Oppermann, Peter
    ;
    Renner, Bernd-Christian
    This dissertation investigates batteryless sensor nodes embedded in metal structures, focusing on acoustic backscatter, active communication, and wireless power transfer. In particular, it analyzes the nonlinear through-metal channel, derives channel models, and proposes in situ channel estimation techniques. Several methods are demonstrated to increase data rates despite reverberation and to improve power-transfer efficiency. In addition to simulation, custom prototypes are designed to verify the method's practical applicability.
    Publicationtype: Doctoral Thesis
      129  260
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    Simulation of traveling-wave tubes for analysis and optimization in modulated back-off
    (2020)
    Safi, Djamschid
    ;
    Jacob, Arne
    In this work, modeling approaches for the simulation of traveling-wave tubes in modulated operation are developed and characterized regarding their computational effort, their practicability, and the accuracy of the results. The impact of the nonlinearities on typical communication characteristics is evaluated, with the purpose of enhancing the understanding of the relationship between classical and effective modulated characteristics. Based on the gathered insights, an automated optimization routine is proposed, including modulated operation to improve the traveling-wave tube's behavior in modulated back-off.
    Publicationtype: Doctoral Thesis
      382  2789