Ara es mostren els items 28-47 de 252

    • Analysis of orthogonal transmit beamforming using statistical channel information 

      Xu, Hongji; Liu, Ju; Rubio, Francisco; Pérez Neira, Ana Isabel (2005-12)
      Article
      Accés restringit per política de l'editorial
      The multiple-access interference (MAI) is one of the major factors threatening the performance of multiuser systems. Transmit beamforming is a powerful strategy to increase the system capacity and mitigate interference. ...
    • Antenna array configurations for massive MIMO outdoor base stations 

      Artiga Campos, Xavier; Perruisseau Carrier, Julien; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      Massive MIMO predicts unprecedented capacity and energy efficiency improvements in future networks, by the use of base stations with hundreds of antennas. However the crucial question of determining suitable, or even ...
    • Antenna subset selection for spatial modulation: a novel and energy efficient single RF technique 

      Ntontin, Konstantinos; Di Renzo, Marco; Pérez Neira, Ana Isabel; Verikoukis, Christos (2013)
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      In this paper, we propose a closed-loop and single RF multiple-input-multiple-output (MIMO) method, particularly suitable for the Uplink of cellular systems, which is based on the low-complexity and recently devised method ...
    • Array antennas for packet transmission networks 

      Pascual Iserte, Antonio; Ahmed, Nada; Pérez Neira, Ana Isabel (2002)
      Text en actes de congrés
      Accés obert
      In the last two decades, adaptive antennas have been applied widely to wireless communication networks with preexisting infrastructure ,i.e networks with base stations. A wide variety of adaptive algorithms has been ...
    • Array covariance error measurement in adaptive parameter estimation 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (. WORKSHOP ON ADAPTIVE ALGORITHMS IN COMMUNICATIONS, 1992)
      Text en actes de congrés
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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 estimation 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (1994)
      Text en actes de congrés
      Accés obert
      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)
      Text en actes de congrés
      Accés obert
      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 ...
    • Assymptotic performance of hierarchical fuzzy interference cancellers for CDMA 

      Pérez Neira, Ana Isabel; Bas, J. (2003)
      Text en actes de congrés
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      This paper presents a hierarchical fuzzy logic canceller that suppresses digital and/or analog interference from a CDMA signal. The optimum filter to remove them is the Conditional Mean Estimator (CME) or the MAP detector ...
    • Autonomous design for the MISO interference channel 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A.; Vázquez, Miguel Ángel (2011)
      Text en actes de congrés
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      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 ...
    • Bluetooth: circuits, sistemes i aplicacions en l'entorn de les TIC 

      Aragonès Cervera, Xavier; González, José Luis; Pérez Neira, Ana Isabel; Casadevall Palacio, Fernando José; Paradells Aspas, Josep (Universitat Politècnica de Catalunya. Institut de Ciències de l'Educació, 2005-02)
      Text en actes de congrés
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      En el projecte s'han implementat uns mòduls formatius, que inclouen tant una vessant teòrica com una part experimental, que permetin a un estudiant de segon cicle de la ETSETB conèixer i desenvolupar aplicacions sobre un ...
    • Candidate spectral estimation for cognitive radio 

      Rojas, Miguel A.; Lagunas Hernandez, Miguel A.; Pérez Neira, Ana Isabel (2007)
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      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 analysis of index modulations over spatial, polarization and frequency dimensions 

      Henarejos Hernández, Pol; Pérez Neira, Ana Isabel (2017-08-23)
      Article
      Accés obert
      IEEE Determining the capacity of a modulation scheme is a fundamental topic of interest. Index Modulations (IM), such as Spatial Modulation (SMod), Polarized Modulation (PMod) or Frequency Index Modulation (FMod), are ...
    • Capacity analysis of WCC-FBMC/OQAM systems 

      Cans, Marius; Pérez Neira, Ana Isabel; Kliks, Adrian; Bodinier, Quentin; Faouzi, Bader (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      This paper evaluates the capacity of weighted circularly convolved FBMC/OQAM systems. A rigorous mathematical model is derived to calculate the increase of capacity that can be obtained thanks to the lattice structure of ...
    • Cellular internet service: advanced front-end for FDSS 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (1999)
      Text en actes de congrés
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    • Centralized vs distributed resource allocation in multi cell OFDMA systems 

      Cicalò, Sergio; Tralli, Velio; Pérez Neira, Ana Isabel (2011)
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      Radio Resource Management with Inter-cell Interference Coordination (ICIC), is a key issue under investigation for next generation wireless systems such as Long Term Evolution (LTE). Although centralized resource allocation ...
    • Challenges in open spectrum systems 

      Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
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      Authorised Shared Access/Licensed Shared Access (ASA/LSA) are a key enabler for an efficient use of the available spectrum in 5G and beyond networks, which will become absolutely compulsory in order to cope with the ...
    • Channel dependent mutual information in index modulations 

      Henarejos Hernández, Pol; Pérez Neira, Ana Isabel; Tato, Anxo; Mosquera Nartallo, Carlos (Institute of Electrical and Electronics Engineers (IEEE), 2018)
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      Mutual Information is the metric that is used to perform link adaptation, which allows to achieve rates near capacity. The computation of adaptive transmission modes is achieved by employing the mapping between the Signal ...
    • Channel norm-bases user scheduling in coordinated multi-point systems 

      Han, Shengqian; Yang, Chenyang; Bengtsson, Mats; Pérez Neira, Ana Isabel (2009)
      Text en actes de congrés
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      In this paper, we address the problem of user scheduling in downlink coordinated multi-point transmission (CoMP) systems, where multiple users are selected and then served with zero forcing beamformer simultaneously by ...
    • Characterization of the effects of multi-tap filtering on FBMC/OQAM systems 

      Caus, Marius; Pérez Neira, Ana Isabel; Kliks, Adrian (HINDAWI, 2014-06-05)
      Article
      Accés obert
      The filter bank multicarrier modulation based on offset quadrature amplitude modulation (FBMC/OQAM) is being considered as an eligible technology for future wireless communications. However, the orthogonality may be destroyed ...
    • Closed form expressions for maximum delay and jitter in multibeam opportunistic beamforming 

      Zorba, Nizar; Pérez Neira, Ana Isabel (2007)
      Text en actes de congrés
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      Scheduling in a broadcast (BC) channel based on partial channel state information at the transmitter (CSIT) is carried out through a multibeam opportunistic beamforming technique. Within a more practical perspective, this ...