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Ara es mostren els items 1-20 de 79

    • 3G access network dimensioning in isolated rural areas based on femtocells 

      Olmo Alòs, Jaume del; Pascual Iserte, Antonio; Vidal Manzano, José; Muñoz Medina, Olga; Agustín de Dios, Adrián (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Based on the definition of the access network architecture and the forecast of voice and data traffic evolution, this paper derives engineering rules for radio network dimensioning of 3G femtocell-based access networks in ...

    • A stochastic approach for resource allocation with backhaul and energy harvesting constraints 

      Rubio López, Javier; Muñoz Medina, Olga; Pascual Iserte, Antonio (2016-07)
      Article
      Accés obert
      We propose a novel stochastic radio-resource-allocation strategy that achieves long-term fairness considering backhaul and air-interface capacity limitations. The base station (BS) is powered only with a finite battery ...

    • A tractable closed form approximation of the ergodic rate in Poisson cellular networks 

      Aravanis, Alexios; Tu Lam, Thanh; Muñoz Medina, Olga; Pascual Iserte, Antonio; Di Renzo, Marco (2019-07)
      Article
      Accés obert
      The employment of stochastic geometry for the analysis and design of ultra dense networks (UDNs) has provided significant insights into network densification. In addition to the characterization of the network performance ...

    • Adaptive bitrate and resource allocation for relay-assisted ARQ transmissions 

      Agustín de Dios, Adrián; Vidal Manzano, José; Muñoz Medina, Olga (2009)
      Text en actes de congrés
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      Automatic repeat request (ARQ) protocols deal with the situations where the selected data rate is not supported by the current channel realization. The inappropriate selection is motivated by the limited channel state ...

    • Analysis of blocking in mmWave cellular systems: application to relay positioning 

      García Ruiz, Cristian; Pascual Iserte, Antonio; Muñoz Medina, Olga (2021-02)
      Article
      Accés obert
      Within the framework of 5G, blockage effects occurring in the mmWave band are critical. Previous works describe the effects of blockages in isolated and multiple links for simple blocking objects, modeled with mathematical ...

    • Analysis of blocking in mmWave cellular systems: Characterization of the LOS and NLOS intervals in urban scenarios 

      García Ruiz, Cristian; Pascual Iserte, Antonio; Muñoz Medina, Olga (Institute of Electrical and Electronics Engineers (IEEE), 2020-12)
      Article
      Accés obert
      In the millimeter waves (mmWave) bands considered for 5G and beyond, the use of very high frequencies results in the interruption of communication whenever there is no line of sight between the transmitter and the receiver. ...

    • Analysis of downlink and uplink decoupling in dense cellular networks 

      Aravanis, Alexios; Muñoz Medina, Olga; Pascual Iserte, Antonio; Vidal Manzano, José (Institute of Electrical and Electronics Engineers (IEEE), 2016-12-22)
      Text en actes de congrés
      Accés obert
      Decoupling uplink (UL) and downlink (DL) is a new architectural paradigm where DL and UL are not constrained to be associated to the same base station (BS). Building upon this paradigm, the goal of the present paper is to ...

    • Analytical resource optimization for DF relay-assisted transmission under HARQ 

      Agustín de Dios, Adrián; Vidal Manzano, José; Muñoz Medina, Olga (IEEE Press. Institute of Electrical and Electronics Engineers, 2009)
      Text en actes de congrés
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      Under limited channel state information at the transmitter the communication suffers from the outage events produced by a data rate selection not supported by the current channel realization. Automatic repeat request (ARQ) ...

    • Approximations of the aggregated interference statistics for outage analysis in massive MTC 

      Liesegang Maria, Sergi; Pascual Iserte, Antonio; Muñoz Medina, Olga (Multidisciplinary Digital Publishing Institute (MDPI), 2019-12)
      Article
      Accés obert
      This paper presents several analytic closed-form approximations of the aggregated interference statistics within the framework of uplink massive machine-type-communications (mMTC), taking into account the random activity ...

    • Beamforming and Multiuser Detection in CDMA Systems with External Interferences 

      Muñoz Medina, Olga; Fernández Rubio, Juan Antonio (ICASSP'99, 1999)
      Text en actes de congrés
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      Multiuser detection has been investigated to mitigate the near-far effect in CDMA systems. Antenna arrays have been shown to provide spatial diversity and cancel undesired signals. In this paper we consider the synergy of ...

    • Blind multi-user combining at the base station for asynchronous CDMA systems 

      Muñoz Medina, Olga; Fernández Rubio, Juan Antonio (Institute of Electrical and Electronics Engineers (IEEE), 1996)
      Text en actes de congrés
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      This paper studies the potential benefits of antenna arrays in cellular CDMA communications and proposes a powerful scheme to undertake the array processing at the base station in CDMA mobile systems. The proposed technique ...

    • Blind multiuser adaptive combining for asynchronous cdma systems 

      Muñoz Medina, Olga; Fernández Rubio, Juan Antonio (1996)
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      This paper presents a novel technique to globally estimate and track the direction of arrival (DOA) of different users in an asynchronous CDMA system. The estimates are obtained exploiting the temporal structure of CDMA ...

    • Cancellation of external and multiple access interference in cdma systems using antenna arrays 

      Muñoz Medina, Olga; Fernández Rubio, Juan Antonio (1997-09)
      Article
      Accés restringit per política de l'editorial
      This paper deals with the problem of multisensor-multiuser detection in CDMA systems in the presence of interferences external to the system. The paper presents a new method able to estimate the spatial signature of all ...

    • Cancellation of external and multiple access interference in cdma systems using antenna arrays 

      Muñoz Medina, Olga; Fernández Rubio, Juan Antonio (D. DOCAMPO, A. R. FIGUEIRAS, F. PÉREZ, 1996)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper deals with the problem of multisensor-multiuser detection in CDMA systems in the presence of interferences external to the system. The paper presents a new method able to estimate the spatial signature of all ...

    • Closed-form capacity bounds for downlink and uplink decoupling 

      Aravanis, Alexios; Pascual Iserte, Antonio; Muñoz Medina, Olga (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Comunicació de congrés
      Accés obert
      Downlink (DL) and uplink (UL) decoupling (DUDe) is a new architectural paradigm where DL and UL are not constrained to be associated to the same base station (BS). Thus, a user having access to multiple BSs within a dense ...

    • Compress-and-forward cooperative MIMO relaying with full channel state information 

      Simoens, Sebastien; Muñoz Medina, Olga; Vidal Manzano, José; Coso, Aitor del (2010-02)
      Article
      Accés obert

    • Cooperative linear precoding for multi-user MISO visible light communications 

      Viñals Terrés, Roser; Muñoz Medina, Olga; Agustín de Dios, Adrián; Vidal Manzano, José (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Text en actes de congrés
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      This paper develops and evaluates precoding techniques for coordinated joint transmission in visible light communications (VLC). A multi-user multiple-input single-output (MISO) setup is adopted. Transmitters are equipped ...

    • Coordinated MIMO precoding for power minimization in femtocell systems 

      Muñoz Medina, Olga; Vidal Manzano, José; Agustín de Dios, Adrián; Pascual Iserte, Antonio; Barbarossa, Sergio (IEEE, 2011)
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      Accés restringit per política de l'editorial

    • Decentralized weighted sum rate maximization in MIMO-OFDMA femtocell networks 

      Agustín de Dios, Adrián; Vidal Manzano, José; Muñoz Medina, Olga; Rodríguez Fonollosa, Javier (2012)
      Text en actes de congrés
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      We propose a decentralized strategy for downlink interference management in overlaid MIMO femtocell-macrocell deployments operating in the same band under OFDMA access. The resource allocation, consisting of MIMO precoders ...

    • Deliverable D21 (project TUCAN3G). Socio-economic scenarios, technical specifications and architecture for the proof of concept 

      García Rey, Ana; Prieto Egido, Ignacio; Sánchez, Ernesto; Muñoz Medina, Olga; Vidal Manzano, José; Agustín de Dios, Adrián; Pascual Iserte, Antonio; Simó Reigadas, Javier; Paco Fernández, Juan; Castillo Molina, Yury Yohana; Ramírez, Gustavo; Tupayachi Calderón, Omar (2013-05)
      Report de recerca
      Accés obert
      TUCAN3G aims to develop solutions to provide 3G services in isolated rural areas of developing countries. In order to do so, this document starts by analysing the reference scenarios where TUCAN3G solutions could be applied, ...