Browsing by Subject "Signal theory (Telecommunication)"

Now showing items 1-20 of 340

    • 60GHz channel characterization using a Scatterer Mapping Technique 

      Papió, Anna; Grau, Alfred; Balcells Ventura, Jordi; Romeu Robert, Jordi; Jofre Roca, Lluís; Flaviis, Franco de (2010)
      Conference report
      Open Access
      In this paper, a Scatterer Mapping Technique based on a Multi-Frequency Bi-focusing operator with good imaging capabilities is used to characterize the 60GHz wireless channel in an office environment. The measurement data ...

    • A BPSK superregenerative receiver. Preliminary results 

      Palà Schönwälder, Pere; Moncunill Geniz, Francesc Xavier; Bonet Dalmau, Jordi; Águila López, Francisco del; Giralt Mas, Ma. Rosa (IEEE Press. Institute of Electrical and Electronics Engineers, 2009-05)
      Conference report
      Open Access
      This paper describes a bit-synchronous superregenerative receiver suitable for BPSK demodulation. The output of the superregenerative oscillator (SRO), which reproduces the phase information of the input signal, is ...

    • A calibration method for fully polarimetric microwave radiometers 

      Lahtinen, J..; Gasiewski, A.J.; Klein, M.; Corbella Sanahuja, Ignasi (IEEE Press. Institute of Electrical and Electronics Engineers, 2003-03)
      Article
      Open Access
      A technique for absolute end-to-end calibration of a fully polarimetric microwave radiometer is presented. The technique is based on the tripolarimetric calibration technique of Gasiewski and Kunkee, but is extended to ...

    • A channel allocation algorithm for OSA-Enabled IEEE 802.11 WLANs 

      Novillo Parales, Francisco Vicente; Churchman, Mathew; Ferrús Ferré, Ramón Antonio; Agustí Comes, Ramon (2009-09)
      Conference report
      Open Access
      Channel allocation problem is a major challenge in wireless local area networks (WLANs), especially in dense deployments of access points (APs) where congestion of the unlicensed spectrum bands (i.e., ISM bands) could ...

    • A cross-layer scheduling strategy for the downlink of a MIMO-OFDMA system with heterogeneous traffic 

      Tralli, V.; Pérez Neira, Ana Isabel; Henarejos Hernández, Pol (2009)
      Conference report
      Open Access
      in this paper we propose and investigate a cross-layer multiuser scheduling strategy for the support of heterogeneous traffic in the downlink of a MIMO-OFDMA system. It jointly considers different objectives: maximize ...

    • A field study on satellite and cellular 

      Gete-Alonso Roldán, Óscar; Martín Escalona, Israel; Barceló Arroyo, Francisco (IEEE Press. Institute of Electrical and Electronics Engineers, 2010)
      Conference report
      Restricted access - publisher's policy
      This article presents a statistical study on the availability of location sources. In particular, it rates the availability of cellular network base stations and GPS satellites in urban scenarios. Individual and joint ...

    • A field study on the fusion of terrestrial and satellite location methods in urban cellular networks 

      Barceló Arroyo, Francisco; Martín Escalona, Israel; Manente, Cyrille (2010-05-01)
      Article
      Restricted access - publisher's policy
      This work studies the improvement in service coverage obtained by three different approaches to combining two triangulation (terrestrial and satellite) location methods for cellular networks in an urban environment. The ...

    • A graph-based strategy to streamline translation quality assessments 

      Pighin, Daniele; Formiga Fanals, Lluís; Màrquez Villodre, Lluís (2012)
      Conference report
      Open Access
      We present a detailed analysis of a graph- based annotation strategy that we employed to annotate a corpus of 11,292 real-world En- glish to Spanish automatic translations with relative (ranking) and absolute ...

    • A linear transform for spectral estimation 

      Lagunas Hernandez, Miguel A.; Figueiras Vidal, Aníbal R.; Mariño Acebal, José Bernardo; Carol Vilanova, Antonio (1981-10)
      Article
      Open Access

    • A long Saharan dust event over the western Mediterrranean: Lidar, Sun photometer observations and regional dust modeling 

      Pérez, Carlos; Nickovic, S.; Baldasano Recio, José María; Sicard, Michaël; Rocadenbosch Burillo, Francisco; Cachorro, V.E. (2006-08-31)
      Article
      Open Access
      A long Saharan dust event affected the western Mediterranean in the period 12– 28 June 2002. Dust was present mainly between 1- and 5-km height affecting most parts of the Iberian Peninsula and reaching western/central ...

    • A maximum approach for robust MIMO design: combining OSTBC and beamforming with minimum transmission power requirements 

      Pascual Iserte, Antonio; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2004)
      Conference report
      Open Access
      In this paper we address the problem of the design of a transmitter in a Multi-Input-Multi-Output (MIMO) space diversity system. We consider a design which is robust to errors in the channel estimate available at the ...

    • A miniaturized two axis sun sensor for attitude control of nano-satellites 

      Angulo, M.; Gras, Ana; Ortega Villasclaras, Pablo Rafael; López Rodríguez, Gema; Ricart Campos, Jordi; Domínguez Pumar, Manuel; Castañer Muñoz, Luis María; Quero, J.M.; Tarrida, C. L.; Reina, M. (2010-10-10)
      Article
      Open Access
      This paper describes the design, fabrication, characterization, and satellite integration of a miniaturized two axis sun sensor which has been used in the attitude control system of the Spanish nano-satellite NANOSAT-1B. ...

    • A new subtree-transfer approach to syntax-based reordering for statistical machine translation 

      Khalilov, Maxim; Rodríguez Fonollosa, José Adrián; Dras, Mark (2009-05)
      Conference lecture
      Open Access
      In this paper we address the problem of translating between languages with word order disparity. The idea of augmenting statistical machine translation (SMT) by using a syntax-based reordering step prior to translation, ...

    • A novel autonomous RAT selection algorithm for non real time services 

      Pérez Romero, Jordi; Sallent Roig, José Oriol (2009)
      Conference report
      Open Access
      This paper proposes a new solution for autonomous decision-making in the RAT selection process in multi-service multi-access network scenarios. It is based on exploiting the time dimension in the RAT selection, so that, ...

    • A novel framework for dynamic spectrum management in multiCell OFDMA networks based on reinforcement learning 

      Bernardo Álvarez, Francisco; Agustí Comes, Ramon; Pérez Romero, Jordi; Sallent Roig, José Oriol (2010)
      Conference report
      Open Access
      In this work the feasibility of Reinforcement Learning (RL) for Dynamic Spectrum Management (DSM) in the context of next generation multicell Orthogonal Frequency Division Multiple Access (OFDMA) networks is studied. ...

    • A novel strategy for radar imaging based on compressive sensing 

      Tello Alonso, Mª Victoria; López Dekker, Francisco J.; Mallorquí Franquet, Jordi Joan (2010-07-08)
      Article
      Open Access
      This paper aims at introducing the recent theory of compressive sensing to radar imaging systems in order to retrieve the imaged scene with better resolution and a reduced amount of collected samples. As a result of ...

    • A rain and scintillation Ka-band channel simulator 

      Rodríguez, E; Sala Álvarez, José; Lamarca Orozco, M. Meritxell; López, J. A.; Rey Micolau, Francesc; Riba Sagarra, Jaume; Vázquez Grau, Gregorio; Villares Piera, Nemesio Javier; Jalón, A (ESA, 2008)
      Conference report
      Open Access
      This paper describes the implementation of a Ka-band satellite channel simulator with emphasis on the synthesis of scintillation processes. The problem becomes one of generating a given probability density function, ...

    • A real-time FPGA-based mobile WiMAX transceiver supporting multi-antenna configurations 

      Bartzoudis, Nikolaos; Font Bach, Oriol; Pascual Iserte, Antonio; López Bueno, David (IEEE, 2011)
      Conference report
      Restricted access - publisher's policy
      This paper presents the design, implementation and experimental validation of a real-time FPGA-based mobile WiMAX baseband transceiver. Three different antenna configuration schemes were implemented and tested, namely ...

    • A remote laboratory to promote the interaction between university and secondary education 

      Casany Guerrero, María José; Cabrera-Bean, Margarita; Bragós Bardia, Ramon; Pérez, Marimar; Sánchez Terrones, Benjamín; Guasch Petit, Antonio; Garófano, F.; Gomis Bellmunt, Oriol; Rius Casals, Juan Manuel (Universidad Politécnica de Madrid (UPM), 2010)
      Conference report
      Open Access
      iLabRS is a remote laboratory developed in Telecom BCN, the Telecom and Electronics Engineering School of the UPC with the key participation of a Secondary Education Technology teacher. Students and teachers can access ...

    • A robust maximin approach for MIMO communications with imperfect channel state information based on convex optimization 

      Pascual Iserte, Antonio; Pérez Palomar, Daniel; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2006-01)
      Article
      Open Access
      This paper considers a wireless communication system with multiple transmit and receive antennas, i.e., a multiple-input-multiple-output (MIMO) channel. The objective is to design the transmitter according to an imperfect ...