Ara es mostren els items 1-20 de 46

    • A family of iterative methods that uses divided differences of first and second orders 

      Ezquerro, José Antonio; Grau Sánchez, Miguel; Hernández Verón, Miguel Angel; Noguera Batlle, Miquel (2015-11-01)
      Article
      Accés obert
      The family of fourth-order Steffensen-type methods proposed by Zheng et al. (Appl. Math. Comput. 217, 9592-9597 (2011)) is extended to solve systems of nonlinear equations. This extension uses multidimensional divided ...
    • A reduced-complexity and asymptotically efficient time-delay estimator 

      Seco Granados, Gonzalo; Swindlehurst, A L; Fernández Rubio, Juan Antonio; Astély, D (ICASSP, 2000)
      Text en actes de congrés
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      This paper considers the problem of estimating the time delays of multiple replicas of a known signal received by an array of antennas. Under the assumptions that the noise and co-channel interference (CCI) are spatially ...
    • Adaptive Beamforming for High Bit Rate Services in the FDD Mode of UTRA 

      Mestre Pons, Francesc X.; Nájar Martón, Montserrat; Antón Haro, Carles; Rodríguez Fonollosa, Javier (Institute of Electrical and Electronics Engineers (IEEE), 1999)
      Text en actes de congrés
      Accés obert
      Most time-reference beamforming algorithms suffer from severe beampattern distortion effects when applied to high bit rate services in WCDMA, causing serious performance degradation in terms of output BER, especially at ...
    • Adaptive principal component analysis for online reduced order parameter extraction in PA behavioral modeling and DPD linearization 

      Pham, Thi Quynh Anh; López Bueno, David; Montoro López, Gabriel; Gilabert Pinal, Pere Lluís (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      This paper presents a new method, based on the adaptive principal component analysis (APCA) technique, that iteratively creates and updates an orthogonal data matrix used to estimate the parameters of power amplifier (PA) ...
    • AIterative algorithm for microwave imaging using the cgm-fft and the pseudoinverse method 

      Mallorquí Franquet, Jordi Joan; Llorens, V (Institute of Electrical and Electronics Engineers (IEEE), 1994)
      Text en actes de congrés
      Accés obert
      Within biomedical microwave tomography, a spatial iterative method for the reconstruction of the complex permittivity of inhomogeneous lossy dielectric objects with arbitrary shape from their scattered electric field is ...
    • An improvement of Ostrowski root-finding method 

      Grau Sánchez, Miguel; Díaz Barrero, José Luis (2006-02)
      Article
      Accés restringit per política de l'editorial
      An improvement to the iterative method based on the Ostrowski one to compute nonlinear equation solutions, which increases the local order of convergence is suggested. The adaptation of a strategy presented here gives a ...
    • An iterative model for fractal antennas: application to the Sierpinski gasket antenna 

      Puente Baliarda, Carles; Borja Borau, M.Carmen; Navarro Rodero, Mònica; Romeu Robert, Jordi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2000-05-31)
      Article
      Accés obert
      A simple model that explains the behavior of the Sierpinski fractal antenna is presented. This model shows that the multiband behavior of the Sierpinski fractal antenna is a consequence of its fractal nature. The model is ...
    • Application of the multilevel decomposition algorithm to the frequency analysis of large microstrip antenna arrays 

      Parrón Granados, Josep; Rius Casals, Juan Manuel; Mosig, Juan R. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2002-03-31)
      Article
      Accés obert
      The application of integral equation methods based in the method of moments discretization to solve large antenna arrays is difficult due to the fact that the computational requirements increase rapidly with the number ...
    • Comment on: "On the Kung-Traub Conjecture for iterative methods for solving quadratic equations" Algorithms 2016, 9, 1 

      Ahmad, Fayyaz (2016-06)
      Article
      Accés obert
      Kung-Traub conjecture states that an iterative method without memory for finding the simple zero of a scalar equation could achieve convergence order 2(d-1), and d is the total number of function evaluations. In an article ...
    • Distributed multivariate regression with unknown noise covariance in the presence of outliers: an MDL approach 

      López Valcarce, Roberto; Romero Gonzalez, Daniel; Sala Álvarez, José; Pagès Zamora, Alba Maria (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
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      We consider the problem of estimating the coefficients in a multivariable linear model by means of a wireless sensor network which may be affected by anomalous measurements. The noise covariance matrices at the different ...
    • Distributed TLS estimation under random data faults 

      Silva Pereira, Silvana; Pagès Zamora, Alba Maria; López Valcarce, Roberto (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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      This paper addresses the problem of distributed estimation of a parameter vector in the presence of noisy input and noisy output data, as well as data faults, performed by a wireless sensor network in which only local ...
    • 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
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      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)
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      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)
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      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)
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      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 ...