Ara es mostren els items 12-31 de 46

    • Expectation–maximisation based distributed estimation in sensor networks 

      López Valcarce, Roberto; Pagès Zamora, Alba Maria (Institution of Engineering and Technology, 2019-03-01)
      Capítol de llibre
      Accés restringit per política de l'editorial
      Estimating the unknown parameters of a statistical model based on the observations collected by a sensor network is an important problem with application in multiple fields. In this setting, distributed processing, by which ...
    • Higher order multi-step iterative method for computing the numerical solution of systems of nonlinear equations: Application to nonlinear PDEs and ODEs 

      Ullah, Malik Zaka; Serra Capizzano, Stefano; Ahmad, Fayyaz; Alaidarous, Eman (2015-10-15)
      Article
      Accés restringit per política de l'editorial
      In the present study, we consider multi-step iterative method to solve systems of nonlinear equations. Since the Jacobian evaluation and its inversion are expensive, in order to achieve a better computational efficiency, ...
    • Higher order multi-step Jarratt-like method for solving systems of nonlinear equations: application to PDEs and ODEs 

      Ahmad, Fayyaz; Tohidi, Emran; Ullah, Malik Zaka; Carrasco, Juan A. (2015-08-01)
      Article
      Accés obert
      This paper proposes a multi-step iterative method for solving systems of nonlinear equations with a local convergence order of 3m - 4, where in (>= 2) is the number of steps. The multi-step iterative method includes two ...
    • Hybrid sparse linear array synthesis applied to phased antenna arrays 

      Yepes, Leonardo Fabio; Covarrubias, David; Alonso, Miguel A.; Ferrús Ferré, Ramón Antonio (2014-01-16)
      Article
      Accés restringit per política de l'editorial
      In this letter, a new hybrid technique to synthesize sparse linear arrays is proposed. This technique is based on the combination of two methods. As a first method, a deterministic synthesis algorithm is used to resolve ...
    • Impact of bias field screening and dipole length in terahertz photoconductive antennas 

      Schönenberger, David; López Menchón, Héctor; Santos Blanco, M. Concepción; Rius Casals, Juan Manuel (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A numerical approach for the modelling of dipole Photoconductive Antennas (PCAs) is presented, based on the classical Drude model with extension to include the bias field screening due to both the space charge and the THz ...
    • Inverse Kinematics Using a Converging Paths Algorithm 

      Heidari, Omid; Pérez Gracia, Alba (Springer Nature, 2020)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This article presents a numerical method for the inverse kinematics of serial chains by utilizing dual quaternion formulation of the robot kinematics within a converging paths algorithm. The method is inspired by iterative ...
    • Iterative method of moments solution of problems involving electrically large and concave geometries 

      Heldring, Alexander; Rius Casals, Juan Manuel; Úbeda Farré, Eduard (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents a study of the scaling with frequency (computational complexity) of preconditioned iterative solution, using the Multilevel Fast Multipole Method, of a class of radiation and scattering problems that ...
    • Maximum likelihood estimation of position in GNSS 

      Closas Gómez, Pau; Fernández Prades, Carlos; Fernández Rubio, Juan Antonio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-05)
      Article
      Accés obert
      In this letter, we obtain the Maximum Likelihood Estimator of position in the framework of Global Navigation Satellite Systems. This theoretical result is the basis of a completely different approach to the positioning ...
    • Method of moments enhancement technique for the analysis of Sierpinski pre-fractal antennas 

      Parrón Granados, Josep; Romeu Robert, Jordi; Rius Casals, Juan Manuel; Mosig, Juan R. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-08-31)
      Article
      Accés obert
      The numerical analysis of highly iterated Sierpinski microstrip patch antennas by method of moments (MoM) involves many tiny subdomain basis functions, resulting in a very large number of unknowns. The Sierpinski ...
    • Mètodes iteratius per a la resolució d'equacions no lineals 

      Fernández Sánchez, Marc (Universitat Politècnica de Catalunya, 2012-06-28)
      Projecte/Treball Final de Carrera
      Accés obert
      El projecte consisteix en un estudi tant teòric com pràctic d'alguns dels mètodes iteratius sense memòria, emprats per la resolució d'equacions no lineals. Es plantegen i analitzen els cinc mètodes següents: Newton, Txebixev, ...
    • Un método simplificado de Newton para calcular la raíz cuadrada de una matriz real simétrica definida positiva 

      Mendoza Mexía, Alfredo; Gómez Aldama, Óscar Rubén (Universitat Politècnica de Catalunya, 2010)
      Article
      Accés obert
    • Microwave imaging techniques for biomedical applications 

      Joisel, A; Mallorquí Franquet, Jordi Joan; Broquetas Ibars, Antoni; Geffrin, J M; Joachimowicz, N; Vall·Llossera, M; Vall-Llossera Ferran, Mercedes Magdalena; Jofre Roca, Lluís; Bolomey, Jean Charles (Vincenzo Piuri and Mario Savino, 1999)
      Text en actes de congrés
      Accés obert
      Microwaves have been considered for medical applications involving the detection of organ movements and changes in tissue water content. More particularly cardiopulmonary interrogation via microwaves has resulted in various ...
    • ML estimator and hybrid beamformer for multipath and interference mitigation in GNSS receivers 

      Seco Granados, Gonzalo; Fernández Rubio, Juan Antonio; Fernández Prades, Carlos (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-05-31)
      Article
      Accés obert
      This paper addresses the estimation of the code-phase(pseudorange) and the carrier-phase of the direct signal received from a direct-sequence spread-spectrum satellite transmitter. The signal is received by an antenna ...
    • Multiresolution hierarchy co-clustering for semantic segmentation in sequences with small variations 

      Varas González, David; Alfaro Vendrell, Mónica; Marqués Acosta, Fernando (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents a co-clustering technique that, given a collection of images and their hierarchies, clusters nodes from these hierarchies to obtain a coherent multiresolution representation of the image collection. We ...
    • Multiuser resource allocation optimization using bandwidth-power product in cognitive radio networks 

      Tachwali, Yahia; Lo, B.F.; Akyildiz, Ian; Agustí Comes, Ramon (2013-03)
      Article
      Accés restringit per política de l'editorial
      In this paper, the problem of resource allocation optimization is studied for a single-cell multiuser cognitive radio network in the presence of primary user networks. The spectral access of the cognitive radio network is ...
    • Negative learning ant colony optimization for network alignment 

      Rodríguez Corominas, Guillem; Blum, Christian; Blesa Aguilera, Maria Josep (Association for Computing Machinery (ACM), 2022)
      Text en actes de congrés
      Accés obert
      The Network Alignment problem is a hard Combinatorial Optimization problem with a wide range of applications, especially in computational biology. Given two (or more) networks, the goal is to find a mapping between their ...
    • Nonlinear actuation model for lateral electrostatically-actuated DC-contact RF MEMS series switches. 

      Lázaro Guillén, Antoni; Girbau Sala, David; Pradell i Cara, Lluís; Nebot Serra, Àlvar (JOHN WILEY & SONS INC, 2007-06-01)
      Article
      Accés obert
      In this work, a nonlinear model to predict actuation characteristics in lateral electrostatically-actuated DC-contact MEMS switches is proposed. In this case a parallel-plate approximation cannot be applied. The model ...
    • On fairness optimization for NOMA-enabled multi-beam satellite systems 

      Wang, Anyue; Lei, Lei; Lagunas Targarona, Eva; Pérez Neira, Ana Isabel; Chatzinotas, Simeon; Ottersten, Bjorn (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Text en actes de congrés
      Accés obert
      In a multi-beam satellite communication system, traffic requests are typically asymmetric across beams and highly heterogeneous among terminals. In practical operations, it is important to achieve a good match between the ...
    • Practical algorithms for a family of waterfilling solutions 

      Pérez Palomar, Daniel; Rodríguez Fonollosa, Javier (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-02-28)
      Article
      Accés obert
      Many engineering problems that can be formulated as constrained optimization problems result in solutions given by a waterfilling structure; the classical example is the capacity-achieving solution for a frequency-selective ...
    • Preconditioning techniques in the analysis of finite metamaterial slabs 

      Úbeda Farré, Eduard; Rius Casals, Juan Manuel; Romeu Robert, Jordi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-01-31)
      Article
      Accés obert
      In the method of moments (MoM) electric field integral equation (EFIE) analysis of slabs of metamaterials, we show that a left-preconditioning scheme by blocks gathering interactions between basis functions belonging to ...