Now showing items 1-20 of 57

  • Adapting fractional frequency reuse to realistic OFDMA cellular networks 

    González González, David; García Lozano, Mario; Ruiz Boqué, Sílvia; Lema, Maria A.; Lee, Dong Seop (2013)
    Conference report
    Restricted access - publisher's policy
    Effective intercell interference (ICI) mitigation has been identified as a key challenge for emerging OFDMA cellular technologies such as Long Term Evolution (LTE). In order to address this issue, mobile operators have ...
  • Advanced techniques for optical access networks based on OFDM 

    Arcas Serrate, Blanca (Universitat Politècnica de Catalunya, 2012-10-05)
    Master thesis
    Open Access
    This Master Thesis aims to review and study the different alternatives for application of OFDM technologies to optical fibre networks and assess their potential as the basis of the next generation PON. New proposals based ...
  • Amping up, saving power 

    López Bueno, David; Wang, Teng; Gilabert Pinal, Pere Lluís; Montoro López, Gabriel (2016-01-01)
    Article
    Open Access
    Fourth-generation (4G) communication systems based on orthogonal frequency division multiplexing (OFDM) and the proposed backwards compatible fifth-generation (5G) variants, like filter-bank multicarrier (FBMC), are based ...
  • Analysis of inter-modulation products and nonlinear distortion in RF OFDM transmitter systems 

    O'Droma, M; Lei, Y; Bertran Albertí, Eduardo; Gilabert Pinal, Pere Lluís (IEEE, 2009)
    Conference report
    Open Access
  • A novel framework for dynamic spectrum management in multiCell OFDMA networks based on reinforcement learning 

    Bernardo Álvarez, Francisco; Agustí Comes, Ramon; Pérez Romero, Jordi; Sallent Roig, José Oriol (2010)
    Conference report
    Open Access
    In this work the feasibility of Reinforcement Learning (RL) for Dynamic Spectrum Management (DSM) in the context of next generation multicell Orthogonal Frequency Division Multiple Access (OFDMA) networks is studied. ...
  • A routing and spectrum assignment problem in optical OFDM networks 

    Klinkowski, Miroslaw; Careglio, Davide (2011)
    Conference report
    Open Access
    Optical Orthogonal Frequency Division Multiplexing (O-OFDM) is a novel and attractive modulation technology enabling flexible sub-wavelength and super-channel transmission in optical networks. In an OFDM-based optical ...
  • A self-organized spectrum assignment strategy in next generation OFDMA networks providing secondary spectrum access 

    Bernardo Álvarez, Francisco; Agustí Comes, Ramon; Pérez Romero, Jordi; Sallent Roig, José Oriol (2009)
    Conference report
    Open Access
    This paper proposes a Self-organized Spectrum Assignment strategy in the context of next generation multicell Orthogonal Frequency Division Multiple Access networks. The proposed strategy is able to dynamically find ...
  • A study of flexible bandwidth allocation in statistical OFDM-based PON 

    Cano Valadéz, Iván Nicolás; Escayola Elias, Francisco Javier; Peralta Gallardo, Ángel; Polo Querol, Víctor; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2013)
    Conference report
    Restricted access - publisher's policy
    The upstream of an OFDM-PON with direct modulated lasers tuned in temperature was experimentally tested. Results demonstrate flexible bandwidth allocation, and show it constitutes an efficient strategy to cope with the ...
  • Cost-effective optical transmission systems based on orthogonal frequency division multiplexing 

    Garcia Villar, Edurne (Universitat Politècnica de Catalunya, 2011-06-30)
    Master thesis
    Open Access
    Orthogonal frequency division multiplexing (OFDM)is becoming increasingly popular in optical fiber applications because as data rates increase, the computational requirements involved in electronic dispersion compensation ...
  • Decentralized weighted sum rate maximization in MIMO-OFDMA femtocell networks 

    Agustín de Dios, Adrián; Vidal Manzano, José; Muñoz Medina, Olga; Rodríguez Fonollosa, Javier (2012)
    Conference report
    Restricted access - publisher's policy
    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 ...
  • Decomposed radio access network over deployed passive optical networks using coherent optical OFDM transceivers 

    Fàbrega Sánchez, Josep Maria; Svaluto Moreolo, Michela; Chochol, Marcin; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2013-04-04)
    Article
    Restricted access - publisher's policy
    In this paper, it is proposed to take advantage of the deployed passive optical network (PON) infrastructure by overlaying a decomposed radio access network (RAN) using a very dense WDM. Coherent optical orthogonal ...
  • Delay bunds for resource allocation in wideband wireless systems 

    Pérez Neira, Ana Isabel; Realp, Marc; Knopp, Raymond (2006)
    Conference report
    Open Access
    In this paper, the problem of resource allocation in multiuser single-antenna wideband OFDM(A) systems is considered from a cross-layer point of view. The main motivation is to show advantages of such systems with respect ...
  • Differential link-loss compensation through dynamic bandwidth assignment in statistical OFDMA-PON 

    Cano Valadéz, Iván Nicolás; Peralta Gallardo, Ángel; Polo Querol, Víctor; Escayola Elias, Francisco Javier; Santos Blanco, M. Concepción; Prat Gomà, Josep Joan (2013)
    Conference report
    Restricted access - publisher's policy
    Flexible bandwidth allocation strategies in a statistical OFDM-PON are experimentally shown to compensate for differential link loss allowing for proper detection of ONUs separated up to 55km (11.4dB)
  • Evaluation of crosstalk robustness of optical OFDM 

    Piera Arrufat, Sergi (Universitat Politècnica de Catalunya, 2016-07-14)
    Bachelor thesis
    Open Access
    The OFDM technology has been highly studied/investigated in the telecommunications field but it is still a relatively new term in the optical communications. OFDM has been evaluated in various studies although the tolerance ...
  • Experimental demonstration of a statistical OFDM-PON with multiband ONUs and elastic bandwidth allocation 

    Cano Valadéz, Iván Nicolás; Escayola Elias, Francisco Javier; Schindler, Philipp C.; Santos Blanco, M. Concepción; Polo Querol, Víctor; Leuthold, Juerg; Tomkos, Ioannis; Prat Gomà, Josep Joan (Institute of Electrical and Electronics Engineers (IEEE), 2015-01-01)
    Article
    Open Access
    The statistical orthogonal frequency division multiplexing passive optical network (OFDM-PON) concept with multiband optical network units (ONUs) is experimentally tested with two users and an optical line terminal at 2.5/5 ...
  • Exploiting the cylic prefix for beamforming in OFDM receivers 

    Pérez Neira, Ana Isabel; Bartolomé Calvo, Diego (2002)
    Conference report
    Open Access
    ­Blind and semiblind antenna array algorithms are proposed for Orthogonal Frequency Division Multiplexing (OFDM) systems in the time domain. A blind technique is proposed for the maximization of the temporal Signal to Noise ...
  • Fairness-based dynamic sub-carrier assignment for real time services in OFDMA networks 

    Bezerra Rodrigues, Emanuel; Casadevall Palacio, Fernando José (VDE Conference Publications, 2014)
    Conference report
    Restricted access - publisher's policy
    Fairness is a crucial aspect for resource allocation in wireless systems, particularly in the downlink of 4G Orthogonal Frequency Division Multiple Access (OFDMA)-based systems. Therefore, it would be interesting for network ...
  • Fiber-based orthogonal frequency division multiplexing transmission systems 

    Heras Miguel, Eduardo (Universitat Politècnica de Catalunya, 2010-11-03)
    Master thesis
    Open Access
  • Gestión inteligente de los recursos radio para redes Ad-hoc de alta velocidad a través del desarrollo de técnicas de lógica Fuzzy, procesado de señal y protocolos de acceso al medio 

    Pérez Neira, Ana Isabel; Pascual Iserte, Antonio; Nájar Martón, Montserrat (2005)
    Conference report
    Open Access
    The general goal of Girafa is to increase throughput and quality of service (QoS) in ad-hoc networks by applying strategies of reconfigurability and PHY/MAC cross-layer design and by developing techniques involving fuzzy ...
  • Implementació en una FPGA d'un sistema de Tx/Rx OFDM 

    Martín Gutiérrez, Francisco (Universitat Politècnica de Catalunya, 2009-04-29)
    Master thesis
    Open Access