Exploració per tema "Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica"

Ara es mostren els items 1-20 de 910

    • 1.25–2.5 Gb/s simple nyquist transmitters for coherent UDWDM-PON with enhanced spectral efficiency 

      Velásquez Micolta, Juan Camilo; Tabares Giraldo, Jeison; Cano Valadez, Iván Nicolás; Prat Gomà, Josep Joan (2018-04-19)
      Article
      Accés obert
      We present a coherent ultra-dense wavelength division multiplexing passive optical network (UDWDM-PON) with enhanced spectral efficiency. The benefit of using Gaussian or Nyquist pulse-shaping filters at the transmitter ...

    • 60GHz material characterization and waveguide antenna array design 

      Papio Toda, Anna (Universitat Politècnica de Catalunya, 2009-01-08)
      Projecte/Treball Final de Carrera
      Accés obert
      Cálculo de la permitividad compleja de materiales usados en PCB y diseño de una agrupación de antenas para la banda de 60GHz.

    • A belief-based decision-making framework for spectrum selection in cognitive radio networks 

      Pérez Romero, Jordi; Raschellà, Alessandro; Sallent Roig, Oriol; Umbert Juliana, Anna (2015-12-17)
      Article
      Accés obert
      This paper presents a comprehensive cognitive management framework for spectrum selection in cognitive radio networks. The framework uses a belief vector concept as a means to predict the interference affecting the different ...

    • A channel characterization technique for HF communications 

      Delgado Penin, José Antonio (1985)
      Text en actes de congrés
      Accés obert
      A wideband channel sounder to characterize the HF radio channel is described. Based on a pseudorandom sequence technique it allows the measurement of the complex impulsional response of the channel with time and frequency ...

    • A compact noise model for carbon nanotube FETs 

      Landauer, Gerhard Martin; González Jiménez, José Luis (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper focuses on the development of a compact noise model for radiofrequency (RF) carbon nanotube field-effect transistors (CNFET). The noise mechanisms in these devices are discussed and the impact of the different ...

    • A comparison of analytical models for resonant inductive coupling wireless power transfer 

      Bou Balust, Elisenda; Alarcón Cot, Eduardo José; Gutiérrez Cabello, Jordi (The Electromagnetics Academy, 2012)
      Text en actes de congrés
      Accés obert
      Recent research in wireless power transfer (WPT) using resonant inductive coupling has demonstrated very high e±ciencies (above 40%) at large distances compared to the antenna dimensions, which has exponentially increased ...

    • A comparison of phase unwrapping techniques in synthetic aperture radar interferometry 

      Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1999)
      Text en actes de congrés
      Accés obert
      A comparison of different phase unwrapping techniques based on the least mean square error is presented. A testing environment based on simulated interferograms has been created in order to assess the methods described in ...

    • A context-aware service architecture for the integration of body sensor networks and social networks through IP multimedia subsystem 

      Domingo Aladrén, Mari Carmen (2011-01-01)
      Article
      Accés restringit per política de l'editorial
      In this article a new context-aware architecture is proposed for the integration of body sensor networks and social networks through the IP Multimedia Subsystem. Its motivating application scenarios are described. The ...

    • A discrete bit loading algorithm for FBMC/OQAM 

      Caus López, Marius; Pérez Neira, Ana Isabel; García Armada, Ana (2012-06)
      Article
      Accés restringit per política de l'editorial
      In this letter the discrete rate maximization problem is investigated for FBMC/OQAM. The analysis reveals that if there is crosstalk certain bit allocations violate the power constraints. Aiming at ensuring the feasibility ...

    • A distributed energy-aware routing protocol for underwater wireless sensor networks 

      Domingo Aladrén, Mari Carmen (2011-04-01)
      Article
      Accés restringit per política de l'editorial
      The design of routing protocols for Underwater Wireless Sensor Networks (UWSNs) poses many challenges due to the intrinsic properties of underwater environments. In this paper we present DUCS (Distributed Underwater ...

    • A downscaling approach to combine SMOS multi-angular and full-polarimetric observations with MODIS VIS/IR data into high resolution soil moisture maps 

      Piles Guillem, Maria; Vall-Llossera Ferran, Mercedes Magdalena; Laguna, Laia; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A downscaling algorithmfor SMOS which combines MODIS Visible/Infrared data and SMOS horizontal brightness temperatures at 42.5◦ incidence angle into high-resolution soil moisture maps has been shown to nicely reproduce ...

    • A fittingness factor-based spectrum management framework for cognitive radio networks 

      Bouali, Faouzi; Sallent Roig, Oriol; Pérez Romero, Jordi; Agustí Comes, Ramon (2013-03)
      Article
      Accés restringit per política de l'editorial
      In order to increase cognitive radios (CRs) operation efficiency, there has been an increasing interest in strengthening awareness level about spectrum utilisation. In this respect, this paper proposes to exploit the ...

    • A general electromagnetic simulation tool to predict the microwave nonlinear response of planar, arbitrarily-shaped HTS structures 

      Parrón Granados, Josep; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Rius Casals, Juan Manuel; Duffo Ubeda, Núria; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-03-31)
      Article
      Accés obert
      This work describes a simulation tool being developed at UPC to predict the microwave nonlinear behavior of planar superconducting structures with very few restrictions on the geometry of the planar layout. The software ...

    • A high dynamic-range RF programmable-gain front end for G.hn RF-Coax in 65-nm CMOS 

      Trulls Fortuny, Xavier; Mateo Peña, Diego; Bofill, Adrià (IEEE Microwave Theory and Techniques Society, 2012-10)
      Article
      Accés restringit per política de l'editorial
      A high-dynamic-range programmable-gain inductorless RF front end suitable for the RF-coax bandplan of the G.hn recommendation is presented. A double-input RF programmable gain amplifier (DI-RFPGA) with switchable capacitive ...

    • A hybrid modal-boundary element method for electromagnetic scattering from arbitrary conducting wedges 

      Cruellas Ibarz, Juan Carlos; Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1990)
      Text en actes de congrés
      Accés obert
      A hybrid technique is used to determine the electromagnetic scattering contribution of arbitrary conducting wedges in electrically large objects. The boundary integral equation is discretized in a fictitious contour, and ...

    • A hydrodynamic model for particle beam-driven plasmon wakefield in carbon nanotubes 

      Martín-Luna, Pablo; Resta-López, Javier; Perera, Aravinda (Universitat Politècnica de Catalunya. Remote Sensing, Antennas, Microwaves and Superconductivity Group (CommSensLab), 2022)
      Text en actes de congrés
      Accés obert
      Charged particles moving through a carbon nanotube may be used to excite electromagnetic modes in the electron gas produced by π and σ orbitals in the cylindrical graphene shell that makes up a nanotube wall [1]. This ...

    • A margin adaptive scheduling algorithm for FBMC/OQAM systems 

      Caus López, Marius; Pérez Neira, Ana Isabel; Moretti, Marco; Kliks, Adrian (2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper addresses the margin adaptive problem for the filter bank multicarrier (FBMC) modulation based on the offset QAM (OQAM), referred to as FBMC/OQAM. The analysis conducted in this paper reveals that due to the ...

    • A measure of flow vorticity with twisted beams of light 

      Belmonte Molina, Aniceto; Rosales Guzmán, Carmelo; Pérez Torres, Juan (Curran, 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The measurement of vorticity, a parameter providing local measurements of rotation at every point in a flow, would greatly assist research fields as diverse as biology microfluidics, complex motions in the oceanic and ...

    • A method for real-time generation of slew-rate limited envelopes in envelope tracking transmitters 

      Montoro López, Gabriel; Gilabert Pinal, Pere Lluís; Bertran Albertí, Eduardo; Berenguer Sau, Jordi (2010-02)
      Text en actes de congrés
      Accés obert

    • A microstrip low cost, high performance, intruder radar detector 

      de los Reyes, Elías; Elias Fusté, Antoni; Ferrando, Miguel; Corbella Sanahuja, Ignasi (Institute of Electrical and Electronics Engineers (IEEE), 1986)
      Text en actes de congrés
      Accés obert
      Doppler Radars operatinq as conventional intruder detectors at X band have been used in several security applications. However, almost all of them utilize heavy and bulky microwave subsystems in wavequide technoloqy. This ...