Now showing items 1-20 of 80

    • 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 ...
    • 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 real-time FPGA-based implementation of a high-performance MIMO-OFDM transceiver featuring a closed-loop communication scheme 

      Font Bach, Oriol; Bartzoudis, Nikolaos; Pascual Iserte, Antonio; López Bueno, David (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Conference report
      Restricted access - publisher's policy
      In this paper we present the FPGA implementation of a multi-antenna Orthogonal Frequency-Division Multiplexing (OFDM) transmitter and receiver featuring a closed-loop (CL) communication scheme. The PHY-layer development ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...
    • Coexisting linear and widely linear transceivers in the MIMO interference 

      Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (2016-01)
      Article
      Open Access
      Recent results have shown the benefits of widely linear precoding (WLP) in the MIMO interference channel (MIMO IC) assuming that all transmitters can follow the same strategy. Motivated by a transitional scenario where ...
    • Control no lineal del sistema Twin Rotor 

      Badia Martinez, Marc (Universitat Politècnica de Catalunya, 2017-09-13)
      Bachelor thesis
      Open Access
      El Twin Rotor MIMO System és un sistema mecànic amb múltiples entrades i múltiples sortides assimilable a un helicòpter, però d’escala més reduïda. Una diferència destacable entre el Twin Rotor MIMO System i una maqueta ...
    • Control of the twin-rotor system 

      Tien Thinh, Than (Universitat Politècnica de Catalunya, 2010-06)
      Master thesis
      Open Access
      The problem of Multi-Input-Multi-Output (MIMO) control has always been an interesting sub-field within the field of control. Among the systems that require MIMO control, the helicopter stands out as one of the prominent ...
    • Decentralized coordinated precoding for dense TDD small cell networks 

      Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (2015-08-01)
      Article
      Open Access
      Cellular networks need the densification of small eNBs (SeNBs) to face the tremendous data traffic demand growth, implying an interference increase and making transmit coordination a key enabler. This article proposes a ...
    • Decentralized widely linear precoding design for the MIMO interference channel 

      Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (2014)
      Conference report
      Restricted access - publisher's policy
      his paper addresses the interference management in a MIMO interference channel (MIMO-IC) by proposing a decentralized transmit and receive beamformer optimization using improper (or circularly asymmetric complex) Gaussian ...
    • Degrees of freedom of the rank-deficient MIMO X channel 

      Agustín de Dios, Adrián; Vidal Manzano, José (2013)
      Conference report
      Restricted access - publisher's policy
      The multiple-input multiple-output (MIMO) X channel with rank-deficient channels is considered. We characterize the total degrees of freedom (DoF) by defining an outer bound which is attained by the proposed precoding ...
    • Design and Analysis of Superresolution algorithm and signal separation technique for an OFDM-based MIMO radar 

      Nguyen, Thanh Thuy (Universitat Politècnica de Catalunya / Karlsruher Institut für Technology, 2012-10-31)
      Master thesis
      Open Access
      Recently, the concept of MIMO radar has been proposed. MIMO radar has the capability to transmit orthogonal (or incoherent) waveforms at multiple transmit antennas. It offers promising potentials for multipath fading, ...
    • Design of pre-coding and combining in hybrid analog-digital massive MIMO with phase noise 

      Corvaja, Roberto; García Armada, Ana; Vazquez, Miguel Angel; Pérez Neira, Ana Isabel (Institute of Electrical and Electronics Engineers (IEEE), 2017)
      Conference report
      Restricted access - confidentiality agreement
      The design of massive MIMO, especially at millimeter waves, requires a trade-off between cost and power consumption, balancing the complexity and the performance in terms of achievable rate. A recent trend in the design ...
    • Differential Feedback of MIMO Channel Gram Matrices Based on Geodesic Curves 

      Sacristán Murga, Daniel; Pascual Iserte, Antonio (2010-12)
      Article
      Restricted access - publisher's policy
      This paper proposes a differential quantization strategy to be used in the feedback link of a multiple-input multiple-output (MIMO) communication system. This algorithm is applied to the channel Gram matrix using geodesic ...