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Ara es mostren els items 21-40 de 252

    • Advanced interference mitigation techniques for the forward link of multi-beam broadband satellite systems 

      Devillers, Bertrand; Pérez Neira, Ana Isabel (2011)
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      High throughput satellite systems are expected to rely in the user link on multi-beam architectures with small beam footprints and strong frequency reuse among beams, and will therefore operate in an interference limited ...

    • Advanced signal processing techniques for fixed and mobile satellite communications 

      Henarejos Hernández, Pol; Pérez Neira, Ana Isabel; Mazzali, N.; Mosquera Nartallo, Carlos (Institute of Electrical and Electronics Engineers (IEEE), 2016)
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      Enabling ultra fast systems has been widely investigated during recent decades. Although polarization has been deployed from the beginning in satellite communications, nowadays it is being exploited to increase the throughput ...

    • 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 ...

    • An innovative interference mitigation approach for high throughput satellite systems 

      Caus, Marius; Pérez Neira, Ana Isabel; Angelone, Martina; Ginesi, Alberto (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      This paper investigates how to boost the forward link capacity in multibeam satellite systems. Since co-channel interference is the main inhibitor to achieve the full potential of frequency reuse, we propose to mitigate ...

    • Analog network coding in the multiple access relay channel: error rate analysis and optimal power allocation 

      Ntontin, Konstantinos; Di Renzo, Marco; Pérez Neira, Ana Isabel; Verikoukis, Christos (2015-06-01)
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      In this paper, we consider Analog Network Coding (ANC) in the Multiple Access Relay Channel (MARC) with multiple relays, and provide the following three-fold contribution: 1) we introduce a tractable mathematical framework ...

    • Analysis and evaluation of decentralized multiaccess Mac for ad-hoc networks 

      Pérez Neira, Ana Isabel; Realp, Marc (2003)
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      In mobile ad-hoc radio networks, terminals are mobile and heterogeneous, the architecture of the network is continuously changing, communication links are packet oriented and radio resources are scarce. Therefore, ...

    • 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)
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      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 ...

    • Analysis of orthogonal transmit beamforming using statistical channel information 

      Xu, Hongji; Liu, Ju; Rubio, Francisco; Pérez Neira, Ana Isabel (2005-12)
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      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)
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      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)
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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)
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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 ...

    • Assymptotic performance of hierarchical fuzzy interference cancellers for CDMA 

      Pérez Neira, Ana Isabel; Bas, J. (2003)
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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)
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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)
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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)
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      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 ...