Now showing items 21-40 of 53

    • Conformacion de haz digital en satélites de comunicaciones 

      Fernández Rubio, Juan Antonio (1991)
      Conference report
      Open Access
    • Cramér-Rao lower bound for breakpoint distance estimation in a path-loss model 

      Castro Arvizu, Juan Manuel; Closas Gómez, Pau; Fernández Rubio, Juan Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      This paper addresses the problem of determining the Cramér-Rao lower bound (CRLB) for the parameters and breakpoint distance in a Path-Loss Channel model for Received Signal Strength (RSS) measurements. The path loss model ...
    • Development and implementation of an adaptive digital beamforming network for satellite communication systems 

      Barrett, M; Fernández Rubio, Juan Antonio (1991-09)
      Article
      Open Access
      The use of adaptive digital beamforming techniques has, until recently, been largely restricted to high performance military radar systems. Recent advances in digital technology, however, have enabled the design of single ...
    • Estudio comparativo de las matrices de correlación clásica y cíclica en arrays de banda estrecha 

      Cerquides Bueno, José Ramón; Muñoz Medina, Olga; Fernández Rubio, Juan Antonio (1993)
      Conference report
      Open Access
      The aim of this communication is to study the differences and similarities between the classic and cyclic correlation matrices of the data snapshots sensed by an array. We will focus our study in the comparison of ...
    • Filtros ML en sistemas de detección y seguimiento en líneas 

      Fernández Rubio, Juan Antonio (Fundación Universidad-Empresa, 1986)
      Conference report
      Open Access
      En el presente trabajo se estudia la aplicación del filtrado ML en sistemas de detección Y seguimiento de líneas a través de una familia de estimadores de función de potencia de parámetros q. Con q = 1 se obtiene el ...
    • Frames: a maximum entropy statistical estimate of the inverse problem 

      Rebollo Neira, Laura; Fernández Rubio, Juan Antonio; Plastino, Angel Luís (1997-01)
      Article
      Open Access
      A maximum entropy statistical treatment of an inverse problem concerning frame theory is presented. The problem arises from the fact that a frame is an overcomplete set of vectors that defines a mapping with no unique ...
    • Introducción a las Comunicaciones 

      Fernández Rubio, Juan Antonio (Universitat Politècnica de Catalunya, 2016)
      Lecture notes
      Open Access
    • LAVICAD: LAboratori VIrtual de Comunicacions Analògiques i Digitals 

      Cabrera-Bean, Margarita; Giró Nieto, Xavier; Rey Micolau, Francesc; Gasull Llampallas, Antoni; Casas, Josep; Villares Piera, Nemesio Javier; Fernández Rubio, Juan Antonio; Sala Álvarez, José; Espinosa Fricke, Pedro; Fernández, Carlos Marcos; Cortes, Silvia; Muntanyola, Mireia; Farré, Miquel Angel (2009-02-12T09:27:53Z)
      Conference lecture / Conference report
      Open Access
      Mitjançant el present ajut s’ha ampliat l’aplicació en xarxa LAVICAD (LAboratori VIrtual de COmunicacions Analògiques i Digitals) que s’ofereix de forma integrada dins de la plataforma d’e-learning COM@WEB. LAVICAD és ...
    • LaViCAD: Laboratorio Virtual de Comunicaciones Analógicas y Digitales 

      Cabrera-Bean, Margarita; Fernández Prades, Carles; Vargas Berzosa, Carlos; Vargas Berzosa, Francisco; Fernández Rubio, Juan Antonio; Gasull Llampallas, Antoni (Universitat de Barcelona. Edicions i Publicacions, 2006)
      Conference report
      Open Access
      En este trabajo se presenta tanto el diseño como la experimentación de un Laboratorio Virtual de Comunicaciones Analógicas y Digitales: LaViCAD. Mediante LaViCAD se pueden experimentar y verificar diferentes aplicaciones ...
    • 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
      Open Access
      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 ...
    • Maximum likelihood propagation-delay estimation in unknown correlated noise using antenna arrays: application to Global Navigation Satellite Systems 

      Seco Granados, Gonzalo; Fernández Rubio, Juan Antonio (1998)
      Conference report
      Open Access
      The problem of estimating the propagation-delay of a desired signal in the presence of interferences and multipath propagation is addressed. This paper presents the maximum likelihood (ML) propagation-delay estimator for ...
    • Maximum likelihood time-of-arrival estimation using antenna arrays: Application to global navigation satellite systems 

      Seco Granados, Gonzalo; Fernández Rubio, Juan Antonio (1998)
      Conference report
      Open Access
      The problem of estimating the time-of-arrival (TOA) of a known signal in the presence of interferences and multipath propagation is addressed. This problem, is essential in high precision receivers of the Global Navigation ...
    • Método MLNq para arrays de alta resolución 

      Gasull Llampallas, Antoni; Lagunas Hernandez, Miguel A.; Fernández Rubio, Juan Antonio; Moreno Bilbao, M. Asunción (Universidad de Sevilla, 1984)
      Conference report
      Open Access
      Spectral analysis techniques are used to bearing estimation problem. Each one of this gives a different array beamforming. We show here a generalized normalized Maximum Likehood Method which present a high resolution ...
    • 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
      Open Access
      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 ...
    • Multipath and interference errors reduction in gps using antenna arrays 

      Seco Granados, Gonzalo; Fernández Rubio, Juan Antonio (ESA PUBLICATIONS DIVISION, 1996)
      Conference report
      Open Access
      The Global Positioning System (GPS) is a worldwide satellite based positioning system that provides any user with tridimensional position, speed and time information. The measured pseudorange is affected by the multipath ...
    • Numerical simulation of long path spherical wave propagation in three-dimensional random media 

      Fernández Rubio, Juan Antonio; Belmonte Molina, Aniceto; Comerón Tejero, Adolfo (1999-09)
      Article
      Restricted access - publisher's policy
      A new method to overcome some limitations in the simulation of the propagation of waves originating from a point source through a very long path in a turbulent medium is presented. Existing propagation simulation algorithms ...
    • On the inverse windowed Fourier transform 

      Rebollo Neira, Laura; Fernández Rubio, Juan Antonio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-11-30)
      Article
      Open Access
      The inversion problem concerning the windowed Fourier transform is considered. It is shown that, out of the infinite solutions that the problem admits, the windowed Fourier transform is the "optimal" solution according to ...
    • On the q=1/2 non-extensive maximum entropy distribution 

      Rebollo Neira, Laura; Plastino, Angel Luís; Fernández Rubio, Juan Antonio (1998-01)
      Article
      Open Access
      A detailed mathematical analysis on the q = 1/2 non-extensive maximum entropy distribution of Tsallis' is undertaken. The analysis is based upon the splitting of such a distribution into two orthogonal components. One ...
    • On wideband deconvolution using wavelet transform 

      Rebollo Neira, Laura; Fernández Rubio, Juan Antonio (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1997-07-31)
      Article
      Open Access
      A discussion on the expression proposed in [1]–[3] for deconvolving the wideband density function is presented. We prove here that such an expression reduces to be proportional to the wideband correlation receiver output, ...
    • Positioning and timing in the MIMO-gnss framework 

      García Molina, J. A.; Fernández Rubio, Juan Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2019)
      Conference report
      Restricted access - publisher's policy
      This paper discusses about GNSS-based positioning and timing in challenging propagation conditions for receivers featuring an array of antennas with an arbitrary distribution. In particular, the positioning and timing ...