Now showing items 21-40 of 174

  • ARMA model maximum entropy power spectral estimation 

    Lagunas Hernandez, Miguel A.; Santamaría Pérez, María Eugenia; Figueiras Vidal, Aníbal R. (1984-10)
    Article
    Open Access
  • A robust maximin approach for MIMO communications with imperfect channel state information based on convex optimization 

    Pascual Iserte, Antonio; Pérez Palomar, Daniel; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2006-01)
    Article
    Open Access
    This paper considers a wireless communication system with multiple transmit and receive antennas, i.e., a multiple-input-multiple-output (MIMO) channel. The objective is to design the transmitter according to an imperfect ...
  • 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 ...
  • A signal subspace framewok of nonlinearly constrained solutions 

    Konyk Jr., Stephen; Amin, Moeness G.; Lagunas Hernandez, Miguel A. (Elsevier, 1990)
    Conference report
    Open Access
  • A unifying approach to transmit beamforming for the MISO interference channel 

    Vázquez, Miguel Angel; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Conference report
    Restricted access - publisher's policy
    This paper addresses the problem of optimal beam- forming in the MISO interference channel. Different approaches are known to obtain the Pareto rate region. In this paper, several frameworks are thoroughly analyzed and ...
  • 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 ...
  • A weighted min-norm method with a recursive implementation 

    Duarte Ortigueira, Manuel; Lagunas Hernandez, Miguel A. (1990)
    Conference report
    Open Access
  • 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 ...