Now showing items 21-40 of 175

    • An improved maximum likelihood method for power spectral density estimation 

      Lagunas Hernandez, Miguel A.; Gasull Llampallas, Antoni (1984-02)
      Article
      Open Access
    • Analysis of information and power transfer in wireless communications 

      Caspers, Erick; Ho Yeung, Sai; Sarkar, Tapan K.; Garcia-Lamperez, Alejandro; Salazr, Magdalena; Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel (2013-06)
      Article
      Restricted access - publisher's policy
      An analysis of wireless information compared to power transfer over the same channel, consisting of a transmitting and receiving antenna system, is discussed. This frequency-selective additive-white-Gaussian-noise channel ...
    • Aplicación del algoritmo de Kalman al estudio de la ritmicidad ultradiana en el comportamiento expontáneo de sujetos humanos aislados 

      Carol Vilanova, Antonio; Gasull Llampallas, Antoni; Lagunas Hernandez, Miguel A. (E.T.S.I.I.T, 1981)
      Conference report
      Open Access
      Este trabajo explora la posible existencia de ritmos ultradianos (período comprendido entre 30 minutos y 20 horas) en el comportamiento espontáneo vigil del hombre, analizando espectralmente las señales con el filtra ...
    • Aplicación del muestreo enfatizado a la evaluación de transmisiones digitales 

      Figueiras Vidal, Aníbal R.; Mariño Acebal, José Bernardo; Lagunas Hernandez, Miguel A.; García Gómez, Ramón (1980)
      Conference report
      Open Access
      The Importance Sampling Technique is a method for reducing the computational effort in Montecarlo simulations for obtaining the relative frequency of an event having a very low probability. While this method is well known ...
    • ARMA model maximum entropy power spectral estimation 

      Lagunas Hernandez, Miguel A.; Santamaría Pérez, María Eugenia; Figueiras Vidal, Aníbal R. (1984-10)
      Article
      Open Access
    • Array covariance error measurement in adaptive parameter estimation 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (. WORKSHOP ON ADAPTIVE ALGORITHMS IN COMMUNICATIONS, 1992)
      Conference report
      Open Access
      The small error approximation is used to derive a linear relationship between the source parameters (i.e. power levels and directions of arrival) and a measurement of the covariance error matrix, defined as the difference ...
    • Array covariance error measurement in adaptive source estimation 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (1994)
      Conference report
      Open Access
      The small error approximation is used to derive a linear relationship between the source parameters (i.e. power levels and directions of arrival) and a measurement of the covariance error matrix, defined as the difference ...
    • Array covariance error measurement in adaptive source parameter estimation 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (1992)
      Conference report
      Open Access
      The small error approximation is used to derive a linear relationship between the source parameters (i.e. power levels and directions of arrival) and a measurement of the covariance error matrix, defined as the difference ...
    • Autonomous design for the MISO interference channel 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A.; Vázquez, Miguel Ángel (2011)
      Conference report
      Restricted access - publisher's policy
      This paper investigates the power control and beamforming design in the MISO-IC (Multiple Input Single Output-Interference Channel) when constraints are placed at the receivers’ input power. In this way regulatory ...
    • Blind beamforming for DS-CDMA systems 

      Pérez Palomar, Daniel; Lagunas Hernandez, Miguel A. (Servicio de Publicaciones Universidad de Vigo, 1999)
      Conference report
      Open Access
      Code Division Multiple Access (CDMA) has been proposed as an efficient access method for cellular and personal communication systems outperforming the classical FDMA and TDMA techniques. But, in contrast to them, CDMA ...
    • Blind wideband source separation 

      Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A.; Bonet, I (1994)
      Conference report
      Open Access
      This paper deals with the general problem of separating two independent wideband sources when they are mixed by unknown filters. In order to solve this problem, a backward framework is proposed which is composed of two ...
    • Candidate spectral estimation for cognitive radio 

      Rojas, Miguel A.; Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel (2007)
      Conference report
      Open Access
      Introducing a different view point of traditional filter bank approach for spectral estimation it is derived a spectral estimation method able to detect a given spectral shape forming part or contributing to a given data ...
    • Capacity results on frequency-selective Rayleigh MIMO channels 

      Pérez Palomar, Daniel; Lagunas Hernandez, Miguel A.; Rodríguez Fonollosa, Javier (European Commission, 2000)
      Conference report
      Open Access
    • Cellular internet service: advanced front-end for FDSS 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (1999)
      Conference report
      Open Access
    • Cepstrum constraints in ME spectral estimation 

      Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1983)
      Conference report
      Open Access
      Current trends in spectral estimation techniques follow basicaly two guidelines; by introducing modifications in the objctive function to be minimized or, keeping the objetive, by modifying the set of constraints in the ...
    • CMA algoritmos de módulo constante en ecualización adaptativa 

      Cabrera-Bean, Margarita; Lagunas Hernandez, Miguel A. (Consejo Superior de Investigaciones Científicas (CSIC), 1986)
      Conference report
      Open Access
      An adaptative digital filtering algorithm that can compensate for both frequency-selective multipath and interference on constant envelope modulated signals is presented. The reported algorithm adapts the coefficients of ...
    • Comments on and extensions of wolf's signal-to-channel noise formulas for delta-modulated systems 

      Figueiras Vidal, Aníbal R.; Mariño Acebal, José Bernardo; Lagunas Hernandez, Miguel A. (1980-01)
      Article
      Open Access
    • Confidential communication in downlink beamforming 

      Vázquez, Miguel Ángel; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2012)
      Conference report
      Restricted access - publisher's policy
      This paper deals with the problem of secure transmission in downlinkbeamforming. In this scenario, a base station, which usually serves information to an amount of users, wants to transmit a confidential message to one ...
    • Conformación de haz con referencia de espectro ensanchado 

      Lagunas Hernandez, Miguel A. (1993)
      Conference report
      Open Access
      The multipath propagation is a problem in many communication systems. The adaptive array beamforming is able to reject the interferences when they are decorrelated with the source of information. Therefore, this kind of ...
    • Conformación de haz con señal de test como referencia temporal 

      Corbera Busquets, Lourdes; Lagunas Hernandez, Miguel A. (1991)
      Conference report
      Open Access
      This paper presents a procedure for CIR beamforming that avoids SVD-like procedures, and is derivad from !he classic CINR solution. The resulting nulls along the direction of the impinging interferers, are of the sama ...