Browsing by Subject "MIMO systems"

Now showing items 1-20 of 125

    • 5G microwave vs. millimeter-wave MIMO wireless mobile systems 

      Ballesteros Sánchez, Christian (Universitat Politècnica de Catalunya, 2018-07)
      Master thesis
      Open Access
      The next generation of wireless systems, 5G, is intended to cover plenty of new emerging applications such as utra-high resolution multimedia systems, industry 4.0, self-driving vehicles and smart cities. All those different ...

    • 5G network planning and optimisation using Atoll 

      Rios, Riviel (Universitat Politècnica de Catalunya, 2019-07)
      Master thesis
      Open Access
      This thesis consists on the study of some 5G NR key features such as massive MIMO and beamforming and how they are modelled by Atoll, a network design and planning software. For this, a single cell was deployed on a sample ...

    • 5G NR small cells deployment using Beamforming 

      Vinyes Marco, Nuria (Universitat Politècnica de Catalunya, 2022-05-24)
      Master thesis
      Open Access
      Covenantee:   Forsk
      5G mobile communication systems should bring significant benefits such as lower latency, higher peak and user data rates, connection density and availability. To achieve such benefits beamforming at the base stations and ...

    • A collaborative statistical actor-critic learning approach for 6G network slicing control 

      Rezazadeh, Farhad; Chergui, Hatim; Blanco Botana, Luis; Alonso Zárate, Luis Gonzaga; Verikoukis, Christos (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Conference lecture
      Open Access
      Artificial intelligence (AI)-driven zero-touch massive network slicing is envisioned to be a disruptive technology in beyond 5G (B5G)/6G, where tenancy would be extended to the final consumer in the form of advanced digital ...

    • A cross-layer scheduling strategy for the downlink of a MIMO-OFDMA system with heterogeneous traffic 

      Tralli, V.; Pérez Neira, Ana Isabel; Henarejos Hernández, Pol (2009)
      Conference report
      Open Access
      in this paper we propose and investigate a cross-layer multiuser scheduling strategy for the support of heterogeneous traffic in the downlink of a MIMO-OFDMA system. It jointly considers different objectives: maximize ...

    • A framework for joint design of pilot sequence and linear precoder 

      Pastore, Adriano; Joham, Michael; Rodríguez Fonollosa, Javier (2016-09-01)
      Article
      Open Access
      Most performance measures of pilot-assisted multiple-input multiple-output systems are functions of the linear precoder and the pilot sequence. A framework for the optimization of these two parameters is proposed, based ...

    • A maximum approach for robust MIMO design: combining OSTBC and beamforming with minimum transmission power requirements 

      Pascual Iserte, Antonio; Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (2004)
      Conference report
      Open Access
      In this paper we address the problem of the design of a transmitter in a Multi-Input-Multi-Output (MIMO) space diversity system. We consider a design which is robust to errors in the channel estimate available at the ...

    • A real-time FPGA-based mobile WiMAX transceiver supporting multi-antenna configurations 

      Bartzoudis, Nikolaos; Font Bach, Oriol; Pascual Iserte, Antonio; López Bueno, David (IEEE, 2011)
      Conference report
      Restricted access - publisher's policy
      This paper presents the design, implementation and experimental validation of a real-time FPGA-based mobile WiMAX baseband transceiver. Three different antenna configuration schemes were implemented and tested, namely ...

    • A tutorial on the characterisation and modelling of low layer functional splits for flexible radio access networks in 5G and beyond 

      Pérez Romero, Jordi; Sallent Roig, Oriol; Gelonch Bosch, Antonio José; Gelabert Doran, Xavier; Klaiqi, Bleron; Kahn, Marcus; Campoy García, David (Institute of Electrical and Electronics Engineers (IEEE), 2023-07-19)
      Article
      Open Access
      The centralization of baseband (BB) functions in a radio access network (RAN) towards data processing centres is receiving increasing interest as it enables the exploitation of resource pooling and statistical multiplexing ...

    • Achievable DoF-delay trade-offs for the K-user MIMO interference channel with delayed CSIT 

      Torrellas, Marc; Agustín de Dios, Adrián; Vidal Manzano, José (2016-12-01)
      Article
      Open Access
      The degrees of freedom (DoFs) of the K-user multiple-input multiple-output (MIMO) interference channel are studied when perfect, but delayed channel state information is available at the transmitter side (delayed CSIT). ...

    • Advances in non-radiative resonant inductive coupling wireless power transfer: a comparison of alternative circuit and system models driven by emergent applications 

      Bou Balust, Elisenda; Sedwick, Raymond; Hu, Patrick; Alarcón Cot, Eduardo José (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Conference report
      Restricted access - publisher's policy
      Recent research in wireless power transfer (WPT) using resonant inductive coupling has demonstrated very high efficiencies at large distances compared to the transmitting element dimensions, thereby increasing the number ...

    • Analysis of Multi-User Uplink Channel with MIMO 

      Pujolar I Bastian, Helena (Universitat Politècnica de Catalunya, 2023-04-11)
      Master thesis
      Open Access
      Covenantee:   Rheinisch-Westfälische Technische Hochschule Aachen
      The increasing number of connected users as well as the availability of new services and mobile applications drive the need for higher data rates. In order to fulfill such expectations different strategies such as spatial ...

    • 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)
      Conference report
      Restricted access - publisher's policy
      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)
      Conference report
      Restricted access - publisher's policy
      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 ...

    • 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
      Open Access
      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 ...

    • Array gain in the DMT framework for MIMO channels 

      García Ordoñez, Luis; Palomar, D.P.; Rodríguez Fonollosa, Javier (2012)
      Article
      Restricted access - publisher's policy
      Following the seminal work by Zheng and Tse on the diversity and multiplexing tradeoff (DMT) of multiple-input multiple-output (MIMO) channels, in this paper, we introduce the array gain to investigate the fundamental ...

    • Asymptotic analysis of multiuser-MIMO networks with battery-constrained receivers 

      Rubio López, Javier; Pascual Iserte, Antonio; García Fernández, Juan José; García Armada, Ana; Font Bach, Oriol; Bartzoudis, Nikolaos (2014)
      Conference report
      Restricted access - publisher's policy
      In this paper, we present an asymptotic analysis of the behavior of a network where the mobile terminals are considered to be battery-powered devices provided with energy harvesting capabilities. The asymptotic analysis ...

    • Capacity of MIMO Channels: asymptotic evaluation under correlated fading 

      Mestre Pons, Francesc X.; Rodríguez Fonollosa, Javier; Pagès Zamora, Alba Maria (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-06-30)
      Article
      Open Access
      This paper investigates the asymptotic uniform power allocation capacity of frequency nonselective multiple-input multiple-output channels with fading correlation at either the transmitter or the receiver. We consider ...

    • Channel norm-bases user scheduling in coordinated multi-point systems 

      Han, Shengqian; Yang, Chenyang; Bengtsson, Mats; Pérez Neira, Ana Isabel (2009)
      Conference report
      Open Access
      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 ...

    • Channel training procedures for MIMO interfering point-to-multipoint channel 

      Agustín de Dios, Adrián; Lagén Morancho, Sandra; Vidal Manzano, José (2014)
      Conference report
      Restricted access - publisher's policy
      A precise knowledge of the MIMO channel between the serving node and the user equipment (UE) is important for attaining good data rates in downlink transmissions (DL) in cellular systems. The interfering point-tomulti ...