Recent Submissions

  • Performance modeling and shaping function extraction for Dual-input load modulated power amplifiers 

    Li, Wantao; Bogusz, Aleksander; Lees, Jonathan; Quaglia, Roberto; Cripps, Steve C.; Montoro López, Gabriel; Gilabert Pinal, Pere Lluís
    Conference report
    Open Access
    This paper proposes the method of extracting a shaping function for operating a family of Dual Input Power Amplifiers operating with modulated signals such as OFDM-based 5G new radio (NR) signals. The shaping function ...
  • Speech translation with foundation models and optimal transport: UPC at IWSLT23 

    Tsiamas, Ioannis; Gallego Olsina, Gerard Ion; Fonollosa, José A. R.; Ruiz Costa-jussà, Marta (Institute of Electrical and Electronics Engineers (IEEE), 2023)
    Conference lecture
    Open Access
    This paper describes the submission of the UPC Machine Translation group to the IWSLT 2023 Offline Speech Translation task. Our Speech Translation systems utilize foundation models for speech (wav2vec 2.0) and text (mBART50). ...
  • Design and implementation of a GPU-Based digital predistortion linearizer for RF power amplifiers 

    Li, Wantao; Montoro López, Gabriel; Gilabert Pinal, Pere Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2023)
    Conference report
    Restricted access - publisher's policy
    This paper presents an automated process for generating computationally efficient radiofrequency (RF) power amplifier (PA) behavioural models that can be used for digital-predistortion (DPD) linearization. The implementation ...
  • Digital control and predistortion linearization of Dual-input load modulated power amplifiers 

    Li, Wantao; Thompson, William; Montoro López, Gabriel; Cope, Mark; BenArfi, Anis; Outaleb, Noureddine; Chuang, Kevin; Gilabert Pinal, Pere Lluís (European Space Agency (ESA), 2023)
    Conference report
    Open Access
    In a satellite communication system, due to the limited amount of energy that can be obtained through photovoltaic cells, there are some constraints on the downlink capabilities, especially for small satellites. A typical ...
  • Low-Profile UWB probe for precise time-domain functional imaging 

    Akazzim, Youness; El Mrabet, Otman; Jofre Roca, Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2023)
    Conference lecture
    Restricted access - publisher's policy
    In this paper a Double Ridge Waveguide (DRW) antenna fed by a microstrip line covering a frequency band from 0.5GHz to 2.5GHz is designed, fabricated, and measured, for functional microwave imaging. The proposed DRW antenna ...
  • Digital shaping and linearization of a dual-input load-modulated balanced amplifier 

    Li, Wantao; Montoro López, Gabriel; Thompson, William; Chuang, Kevin; Gilabert Pinal, Pere Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2023)
    Conference report
    Restricted access - publisher's policy
    This paper presents shaping and linearization techniques to trade-off linearity and power efficiency in a dual-input pseudo-Doherty load-modulated balanced amplifier (PD-LMBA). The proposed shaping function is defined to ...
  • Efficient speech translation with dynamic latent perceivers 

    Tsiamas, Ioannis; Gallego Olsina, Gerard Ion; Fonollosa, José A. R.; Costajussa, M.R. (Institute of Electrical and Electronics Engineers (IEEE), 2023)
    Conference lecture
    Open Access
    Transformers have been the dominant architecture for Speech Translation in recent years, achieving significant improvements in translation quality. Since speech signals are longer than their textual counterparts, and due ...
  • On the detection and solution of coverage holes in 5G networks through relay user equipment: a combined DBSCAN and deep-Q network approach 

    Hernández Carlón, Juan Jesús; Pérez Romero, Jordi; Sallent Roig, Oriol; Vilà Muñoz, Irene; Casadevall Palacio, Fernando José (Institute of Electrical and Electronics Engineers (IEEE), 2023)
    Conference report
    Open Access
    This paper proposes a model to detect and solve coverage holes in 5G Radio Access Network (RAN) deployments operating with millimeter waves. The proposed model utilizes a DBSCAN-based detector to identify coverage constrained ...
  • Incremental DPD linearization for mobile terminals with non-flat frequency response in dynamic bandwidth Re-allocation scenarios 

    Li, Wantao; Guo, Yan; Montoro López, Gabriel; Gilabert Pinal, Pere Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2023)
    Conference report
    Open Access
    This paper presents a low-complexity open-loop digital linearization system for handset applications with non-flat frequency response when considering a 5G new radio dynamic bandwidth re-allocation scenario. The proposed ...
  • Frequency-Dependent DPD linearization for load-mismatched mobile terminal PAs operating under dynamic resource block allocation 

    Li, Wantao; Montoro López, Gabriel; Guo, Yan; Gilabert Pinal, Pere Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2023)
    Conference report
    Open Access
    This paper presents a novel linearization method to compensate for load-mismatched power amplifiers in 5G new radio mobile terminals. The proposed digital predistortion (DPD) approach is based on a frequency-dependent ...
  • Experimental measurements of radio signal attenuation and Faraday rotation due to electron number density in a plasma flow 

    Felgueiras Luis, Diana Zaida; Fagnani, Andrea; Viladegut Farran, Alan; Helber, Bernd; Camps Carmona, Adriano José; Chazot, Olivier (European Conference for AeroSpace Sciences (EUCASS), 2023)
    Conference report
    Open Access
    Spacecraft entering a planetary atmosphere are surrounded by a plasma layer containing high levels of ionization. The high electron number densities cause attenuation and rotation of the polarization of the emitted signal, ...
  • Realistic colon phantoms for microwave colonoscopy validation 

    Garrido Atienza, Alejandra; Guardiola Garcia, Marta; Romeu Robert, Jordi; Neira Steinfort, Luz Maria (Institute of Electrical and Electronics Engineers (IEEE), 2023)
    Conference lecture
    Open Access
    Colon phantoms that replicate a real colon dielectric properties, shape, and texture are required to verify a microwave colonoscopy system. The realism and accuracy of the phantom are quantified in this study using a method ...

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