Now showing items 1-20 of 75

  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Dimensionality constraints imposed by highly frequency selective channels on MIMO-FBMC / OQAM systems 

    Pérez Neira, Ana Isabel; Caus, Marius (VDE Conference Publications, 2015)
    Conference report
    Restricted access - publisher's policy
    This paper investigates the application of MIMO to the FBMC/OQAM scheme in highly frequency selective channels. The system model that is considered in this work does not make any assumption about the flatness of the channel. ...
  • Distributed inter-cluster interference management for CoMP-based cellular networks 

    Lagén Morancho, Sandra; Agustín de Dios, Adrián; Vidal Manzano, José (2013)
    Conference report
    Restricted access - publisher's policy
    This paper proposes distributed inter-cluster interference management procedures for 1 Coordinated Multi-Point (CoMP) Time Division Duplexing (TDD) cellular networks, in which a set of base stations (BSs), that form a ...