Enviaments recents

  • Technique for generating periodic structured light beams using birefringent elements 

    Terborg, Roland A.; Pérez Torres, Juan; Pruneri, Valerio (2018-10-29)
    Article
    Accés obert
    We put forward a simple, scalable and robust technique for generating periodically structured light beams with intensity patterns, e.g. of the form cos2n(kxx) cos2m(kyy), where kx and ky are real numbers that can be tailored ...
  • Analyses of shallow convection over the amazon coastal region using satellite images, data observations and modeling Análise da Convecção Rasa sobre a Região Costeira Amazônica Usando Imagens de Satélite, Dados Observacionais e Modelagem 

    Pires Bassi Marinho, Luciana; Suselj, Kay; Rossato, Luciana; Teixeira, João (Sociedade Brasileira de Meteorologia, 2018-04-01)
    Article
    Accés obert
    The Belem region of the state of Para, which is located in northern of Brazil and part of the Amazon biome is characterized by high temperatures, strong convection, unstable air conditions and high humidity favoring the ...
  • SDN-based parallel link discovery in optical transport networks 

    Montero Herrera, Rafael; Agraz Bujan, Fernando; Pagès Cruz, Albert; Perelló Muntan, Jordi; Spadaro, Salvatore (Wiley-Blackwell, 2018-01-01)
    Article
    Accés obert
    The use of optical technologies in modern network scenarios has increased in the last decade, mostly due to their support in crucial networking topics (ie, bandwidth and scalability). In parallel, these scenarios have also ...
  • Optimal power control law for equal-rate DS-CDMA networks governed by a successive soft interference cancellation scheme 

    Molina Oliveras, Francesc; Sala Álvarez, José; Villares Piera, Nemesio J.; Rey Micolau, Francesc (Institute of Electrical and Electronics Engineers (IEEE), 2018)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    This paper studies the throughput maximization of a dense multiple access network of low-rate subscribers that share the same practical Forward Error Correction (FEC) code and modulation scheme, and transmit to a central ...
  • Digital pre-emphasis for 10Gb/s with low-cost directly phase-modulated lasers for PONs 

    Tabares Giraldo, Jeison; Napoli, Antonio; Polo Querol, Víctor; Calabro, S.; Sommerkorn-Krombholz, B.; Spinnler, B.; Prat Gomà, Josep Joan (Optical Society of American (OSA), 2018)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    We apply digital pre-emphasis to compensate for the frequency response non-idealities of low-cost optical transmitters. It enables transmission beyond 10Gb/s with 2/4/8-DPSK using directly modulated lasers and coherent ...
  • Simplified carrier recovery for intradyne optical PSK receivers in udWDM-PON 

    Tabares Giraldo, Jeison; Ghasemi, Saeed; Polo Querol, Víctor; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2018-04-28)
    Article
    Accés obert
    We present an optimized carrier recovery architecture based on differential detection for coherent optical receivers that substantially reduces the required DSP hardware resources, aimed at cost-effective transceivers for ...
  • A compact dual-band planar monopole antenna using fractal rings and A Y-shaped feeding transmission line 

    Djafri, Kahina; Challal, Mouloud; Romeu Robert, Jordi (De Gruytr, 2018-01-01)
    Article
    Accés restringit per política de l'editorial
    This paper presents a novel design approach of a compact dual-band monopole antenna with an overall size of 18.9x13x1.6mm3. The proposed antenna is composed of a fractal ring shaped patch fed by a Y-shaped transmission ...
  • Allocating multi-rate requests to single-rate lightpaths in Flexgrid optical networks 

    Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2018)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Some ideas about the effect of appropriately selecting the size of the connections conveyed by multi-rate flexgrid optical networks are discussed. The main focus is on illustrating the relation between spectrum consumption ...
  • A figure of merit to assess the performance of photoconductive antennas at terahertz band 

    Romeu Robert, Jordi; Cea Falcó, Marc de; Jofre Roca, Lluís; Yazgan, Ahmet Utku (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Photoconductive antennas are one of the most efficient ways to radiate and receive EM waves around the 1 THz frequency band. The physical processes involved in photoconductive terahertz signal generation are complex enough ...
  • An anti-jamming system for GNSS timing applications 

    Querol Borràs, Jorge; Camps Carmona, Adriano José; Manfredini, E.G.; Píriz, R. (Institute of Electrical and Electronics Engineers (IEEE), 2018)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Radio-Frequency Interference (RFI) and jamming are increasing problems for timing applications based on Global Navigation Satellite Systems (GNSS). FENIX-lite is a real-time pre-correlation anti-jamming system designed to ...
  • Regions de decisió i cota de la unió 

    Sala Álvarez, José (2018-10-01)
    Report de recerca
    Accés obert
    Aquest document presenta de forma gràfica: - La determinació de la regió de decisió R associada a un símbol complexe s = I + jQ . - La determinació de la seva probabilitat d’error i la d’una cot a superior (Cota de la ...
  • Inhibition of tunneling and edge state control in polariton topological insulators 

    Zhang, Yiqi; Kartashov, Yaroslav V.; Zhang, Yanpeng; Torner Sabata, Lluís; Skryabin, Dmitry V. (2018-12-01)
    Article
    Accés obert
    We address the inhibition of tunneling in polariton condensates confined in a potential landscape created by a honeycomb array of microcavity pillars in the presence of spin- orbit coupling and Zeeman splitting in the ...

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