Exploració per autor "Pérez Neira, Ana Isabel"Més informacióMés informació

Ara es mostren els items 80-99 de 252

    • Edge computing and communication for energy-efficient earth surveillance with LEO satellites 

      Martínez Gost, Marc; Leyva-Mayorga, Israel; Pérez Neira, Ana Isabel; Vázquez Oliver, Miguel Ángel; Soret, Beatriz; Moretti, Marco (Institute of Electrical and Electronics Engineers (IEEE), 2022)
      Comunicació de congrés
      Accés obert
      Modern satellites deployed in low Earth orbit (LEO) accommodate processing payloads that can be exploited for edge computing. Furthermore, by implementing inter-satellite links, the LEO satellites in a constellation can ...

    • Efficient margin adaptive scheduling for MIMO-OFDMA systems 

      Moretti, Marco; Pérez Neira, Ana Isabel (2013-01)
      Article
      Accés restringit per política de l'editorial
      In this paper we address the problem of margin adaptive scheduling in the downlink of an orthogonal frequency division multiple access (OFDMA) multiple-input multiple-output (MIMO) system. Optimal resource allocation in ...

    • Energy efficiency communications over the AWGN relay channel 

      Gómez Vilardebó, Jesús; Pérez Neira, Ana Isabel; Nájar Martón, Montserrat (2010)
      Article
      Accés restringit per política de l'editorial
      This paper addresses the energy efficiency analysis of the relay channel under additive white Gaussian noise. We consider the rate bounds given by decode and forward and the cut set bound and assume that resources are ...

    • Energy efficient communications over the AWGN relay channel 

      Gómez Vilardebó, Jesús; Pérez Neira, Ana Isabel; Nájar Martón, Montserrat (2010-01-08)
      Article
      Accés obert
      This paper addresses the energy efficiency analysis of the relay channel under additive white Gaussian noise. We consider the rate bounds given by decode and forward and the cut set bound and assume that resources are ...

    • Enhancing cell-free massive MIMO networks through LEO satellite integration 

      Riera Palou, Felip; Femenias Nadal, Guillem; Caus López, Màrius; Shaat, Musbah; García Morales, Jan; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Text en actes de congrés
      Accés obert
      This paper proposes a hybrid network architecture combining a cell-free Massive MIMO terrestrial layout with a low Earth orbit satellite segment jointly targeting the maximization of the minimum per-user rate in the coverage ...

    • ENN: a neural network with DCT adaptive activation functions 

      Martínez Gost, Marc; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 2024-02-01)
      Article
      Accés obert
      The expressiveness of neural networks highly depends on the nature of the activation function, although these are usually assumed predefined and fixed during the training stage. Under a signal processing perspective, in ...

    • Error rate analysis and optimal power allocation in multiple access relay channels with analog network coding 

      Ntontin, Konstantinos; Di Renzo, Marco; Pérez Neira, Ana Isabel; Verikoukis, Christos (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper, we examine multi-source multi-relay systems that employ Analog Network Coding for which we provide a two-fold contribution: i) We derive a closed-form upper bound of the average symbol error rate (SER) ...

    • Estimación recursiva simultánea de potencia y DOA por ajuste de la matriz de covarianza asociada a la apertura 

      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 or DOA's) and a measurement of the covariance error matrix, defined as the ...

    • Evaluation of spectrum opportunities in the GSM band 

      Carniani, Andrea; Giupponi, Lorenza; Verdone, Roberto; Pérez Neira, Ana Isabel (2009)
      Text en actes de congrés
      Accés obert
      In this paper we explore the possibility of exploiting underutilized channels in the GSM bands. The secondary (unlicensed) users of the spectrum are the nodes of an overlay cognitive ad-hoc network, which opportunistically ...

    • Evolution of spatial and multicarrier scheduling: towards multi-cell scenario 

      Henarejos Hernández, Pol; Pérez Neira, Ana Isabel; Tralli, Velio; Moretti, Marco; Dimitriou, Nikos; Dainelli, Giulio (2010)
      Text en actes de congrés
      Accés obert
      OFDMA systems are considered as the promising multiple access scheme of next generation multi-cellular wireless systems. In order to ensure the optimum usage of radio resources, OFDMA radio resource management algorithms ...

    • Examen Final 

      Pérez Neira, Ana Isabel (Universitat Politècnica de Catalunya, 2019-01-08)
      Examen
      Accés restringit a la comunitat UPC

    • Examen Final 

      Pascual Iserte, Antonio; Pérez Neira, Ana Isabel; Riba Sagarra, Jaume (Universitat Politècnica de Catalunya, 2021-06-17)
      Examen
      Accés restringit a la comunitat UPC

    • Examen Final 

      Pérez Neira, Ana Isabel (Universitat Politècnica de Catalunya, 2014-06-06)
      Examen
      Accés restringit a la comunitat UPC

    • Examen Final 

      Cabrera-Bean, Margarita; Pascual Iserte, Antonio; Pérez Neira, Ana Isabel (Universitat Politècnica de Catalunya, 2020-06-16)
      Examen
      Accés restringit a la comunitat UPC

    • Experimental performance bounds of MIMO-FBMC/OQAM systems 

      Caus López, Marius; Pérez Neira, Ana Isabel (2010)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper addresses the application of filter bank multicarrier (FBMC) systems to multiple-input-multiple-output (MIMO) channels. In particular, it is investigated the FBMC modulation based on OQAM, known as FBMC/OQAM. ...

    • Experimental performance evaluation of a MAC protocol for cooperative ARQ scenarios 

      Verikoukis, Christos; Pérez Neira, Ana Isabel; Alonso Zárate, Jesús; Skiannis, Ch. (2009)
      Text en actes de congrés
      Accés obert
      This paper provides details and performance evaluation of the implementation of the Persistent Relay Carrier Sensing Multiple Access (PRCSMA) protocol for Cooperative ARQ (C-ARQ) scenarios using off-the-shelf wireless ...

    • Exploiting transmission spatial diversity in frequency selective systems with feedback channel 

      Pérez Neira, Ana Isabel; Pascual, T.; Lagunas Hernandez, Miguel A. (2003)
      Text en actes de congrés
      Accés obert
      In this paper we address the design of a multiple transmit antenna system in which the Channel State Information (CSI) at the transmitter is not perfect. Two different approaches are analyzed one based on the Minimization ...

    • Exploiting the cylic prefix for beamforming in OFDM receivers 

      Pérez Neira, Ana Isabel; Bartolomé Calvo, Diego (2002)
      Text en actes de congrés
      Accés obert
      ­Blind and semiblind antenna array algorithms are proposed for Orthogonal Frequency Division Multiplexing (OFDM) systems in the time domain. A blind technique is proposed for the maximization of the temporal Signal to Noise ...

    • Exploiting transmission spatial diversity in frequency selective systems with feedback channel 

      Pascual Iserte, Antonio; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 2003)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this paper we address the design of a multiple transmit antenna system in which the Channel State Information (CSI) at the transmitter is not perfect. Two different approaches are analyzed: one based on the Minimization ...

    • Exploratory analysis of superposition coding and rate splitting for multibeam satellite systems 

      Caus, Marius; Pastore, Adriano; Navarro Rodero, Mònica; Ramirez, Tomás; Mosquera Nartallo, Carlos; Noels, Nele; Alagha, Nader; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The adoption of aggressive frequency reuse schemes along with interference management techniques has become the leading paradigm in satellite communications to increase the spectral efficiency. In general terms, one cannot ...