Browsing by Subject "Iterative methods"
Now showing items 120 of 23

A family of iterative methods that uses divided differences of first and second orders
(20151101)
Article
Restricted access  publisher's policyThe family of fourthorder Steffensentype methods proposed by Zheng et al. (Appl. Math. Comput. 217, 95929597 (2011)) is extended to solve systems of nonlinear equations. This extension uses multidimensional divided ... 
An improvement of Ostrowski rootfinding method
(200602)
Article
Restricted access  publisher's policyAn 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
(IEEEINST ELECTRICAL ELECTRONICS ENGINEERS INC, 20000531)
Article
Open AccessA 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
(IEEEINST ELECTRICAL ELECTRONICS ENGINEERS INC, 20020331)
Article
Open AccessThe 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 ... 
Higher order multistep iterative method for computing the numerical solution of systems of nonlinear equations: Application to nonlinear PDEs and ODEs
(20151015)
Article
Restricted access  publisher's policyIn the present study, we consider multistep 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, ... 
Hybrid sparse linear array synthesis applied to phased antenna arrays
(20140116)
Article
Restricted access  publisher's policyIn 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 ... 
Iterative method of moments solution of problems involving electrically large and concave geometries
(Institute of Electrical and Electronics Engineers (IEEE), 2013)
Conference report
Restricted access  publisher's policyThis 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
(IEEEINST ELECTRICAL ELECTRONICS ENGINEERS INC, 200705)
Article
Open AccessIn 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 prefractal antennas
(IEEEINST ELECTRICAL ELECTRONICS ENGINEERS INC, 20030831)
Article
Open AccessThe 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
(Universitat Politècnica de Catalunya, 20120628)
Master thesis (preBologna period)
Open AccessEl 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
(Universitat Politècnica de Catalunya, 2010)
Article
Open Access 
ML estimator and hybrid beamformer for multipath and interference mitigation in GNSS receivers
(IEEEINST ELECTRICAL ELECTRONICS ENGINEERS INC, 20050531)
Article
Open AccessThis paper addresses the estimation of the codephase(pseudorange) and the carrierphase of the direct signal received from a directsequence spreadspectrum satellite transmitter. The signal is received by an antenna ... 
Multiuser resource allocation optimization using bandwidthpower product in cognitive radio networks
(201303)
Article
Restricted access  publisher's policyIn this paper, the problem of resource allocation optimization is studied for a singlecell multiuser cognitive radio network in the presence of primary user networks. The spectral access of the cognitive radio network is ... 
Nonlinear actuation model for lateral electrostaticallyactuated DCcontact RF MEMS series switches.
(JOHN WILEY & SONS INC, 20070601)
Article
Open AccessIn this work, a nonlinear model to predict actuation characteristics in lateral electrostaticallyactuated DCcontact MEMS switches is proposed. In this case a parallelplate approximation cannot be applied. The model ... 
Practical algorithms for a family of waterfilling solutions
(IEEEINST ELECTRICAL ELECTRONICS ENGINEERS INC, 20050228)
Article
Open AccessMany engineering problems that can be formulated as constrained optimization problems result in solutions given by a waterfilling structure; the classical example is the capacityachieving solution for a frequencyselective ... 
Preconditioning techniques in the analysis of finite metamaterial slabs
(IEEEINST ELECTRICAL ELECTRONICS ENGINEERS INC, 20060131)
Article
Open AccessIn the method of moments (MoM) electric field integral equation (EFIE) analysis of slabs of metamaterials, we show that a leftpreconditioning scheme by blocks gathering interactions between basis functions belonging to ... 
Quantitative images of large biological bodies in microwave tomography by using numerical and real data
(IEEINST ELEC ENG, 19961101)
Article
Open AccessA new inverse microwave imaging algorithm is presented which has the ability to obtain quantitative dielectric maps of large biological bodies. By using a priori information, obtained with a first order algorithm, the final ... 
Secondorder parameter estimation
(IEEEINST ELECTRICAL ELECTRONICS ENGINEERS INC, 20050731)
Article
Open AccessThis work provides a general framework for the design of secondorder blind estimators without adopting any approximation about the observation statistics or the a priori distribution of the parameters. The proposed ... 
Selfsimilar prefractal frequency selective surfaces for multiband and dualpolarized applications
(IEEEINST ELECTRICAL ELECTRONICS ENGINEERS INC, 20030131)
Article
Open AccessFrequencyselective surfaces (FSS) that have been designed using the iterative techniques of fractals have been fabricated and measured. Fractals contain many scales of the starting geometry, each of which acts as a ... 
Spectral iterative algorithm for RCS computation in electrically large or intermediate perfectly conducting cavities
(IEEEINST ELECTRICAL ELECTRONICS ENGINEERS INC, 19940601)
Article
Open AccessA novel algorithm designed to compute efficiently and accurately the highfrequency electromagnetic scattering from openended waveguide cavities is presented. The cavity is converted into a steppedwaveguide model so that ...