Enviaments recents

  • Experimental result for a sdma mobile communications antenna array system 

    Goldberg, Jason Matthew; Pagès Zamora, Alba Maria; Lagunas Hernandez, Miguel A.; Rodríguez Fonollosa, Javier; Vázquez Grau, Gregorio (EE PUBL. EE PUBL., 1996)
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    This paper presents experimental results for a Spatial Division Multiple Access cellular mobile communications system. The basestation antenna array testbed used to obtain the results is described in addition to sophisticated ...
  • High performance doa trackers derived from paralell low resolution detectors 

    Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (IEEE IEEE COMPUTER SOCIETY PRESS, 1996)
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    Traditionally, high resolution spectral direction of arrival (DOA) estimation has been associated with algorithms rather than with a processing scheme or architecture. Motivated by previous work on feasible implementations ...
  • High resolution adaptative arrays based on random processing techniques: frequency hopping modulation 

    Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1995)
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    A new architecture for adaptive arrays using frequency hopping modulation is addressed. The resolution of the array and the interference rejection increase substantially applying random processing to the carrier frequency ...
  • An adaptative fuzzy logic enhancer for rejection of narrowband interference in DS-Spread Spectrum 

    Pérez Neira, Ana Isabel; Antón Haro, Carles; Lagunas Hernandez, Miguel A. (1998)
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    This work develops a novel adaptive fuzzy line enhancer that, based on a fuzzy basis function expansion, successfully solves the non-linear problem of narrowband interference estimation and rejection in direct sequence-spread ...
  • Array covariance error measurement in adaptive parameter estimation 

    Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (. WORKSHOP ON ADAPTIVE ALGORITHMS IN COMMUNICATIONS, 1992)
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    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)
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    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 ...
  • Source separation based on coupled single DOA estimation processors 

    Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 1993)
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    The separation of sources from an array of sensors is addressed. Based on Kolmogorov's theorem, an adaptive algorithm is proposed to separate simultaneously all the unknown impinging sources on an aperture of sensors. This ...
  • Simultaneous DOA estimation based on Kolmogorov's theorem 

    Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 1993)
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    The design of a new architecture for signal processing, based on the Kolmogorov's theorem (1957), is addressed. This architecture is applied to solve the problem of source separation. Particularly, an adaptive algorithm ...
  • Blind wideband source separation 

    Nájar Martón, Montserrat; Lagunas Hernandez, Miguel A.; Bonet, I (1994)
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    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 ...
  • Multiuser array beamforming based on a neural network mapping 

    Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (1994)
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    This paper addresses the problem of simultaneous multiuser service. To find a feasible solution to the collision problem, two time reference multibeamformer systems are developed (BPSK TRMB and frequency framing TRMB). ...

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