Exploració per tema "Orthogonal frequency division multiplexing"

Ara es mostren els items 1-20 de 64

    • 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, Oriol (2010)
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      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)
      Text en actes de congrés
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      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, Oriol (2009)
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      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)
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      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 ...

    • A technique for OFDM symbol slicing 

      Pérez Neira, Ana Isabel; Lagunas Hernandez, Miguel A. (Institute of Electrical and Electronics Engineers (IEEE), 2021)
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      This work presents an orthonormal transform that splits the Orthogonal Frequency Division Multiplex (OFDM) symbol into slices with ranked rate and decoding complexity. The advantage over the existing carrier or time ...

    • 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)
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      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)
      Projecte Final de Màster Oficial
      Accés obert
      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
      Accés obert
      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)
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    • Asymmetrical clipping optical filter bank multi-carrier modulation scheme 

      Ibrahim Mohamed Badr, Asmaa; Prat Gomà, Josep Joan; Ismail, Tawfik (2021-05)
      Article
      Accés obert
      Filter bank multi-carrier (FBMC) is considered a promising alternative to the Orthogonal Frequency Division Multiplexing (OFDM) scheme. It improves spectral efficiency by eliminating the need for cyclic prefix while ...

    • Cost-effective optical transmission systems based on orthogonal frequency division multiplexing 

      Garcia Villar, Edurne (Universitat Politècnica de Catalunya, 2011-06-30)
      Projecte Final de Màster Oficial
      Accés obert
      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)
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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 ...

    • 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
      Accés restringit per política de l'editorial
      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)
      Text en actes de congrés
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      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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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)
      Treball Final de Grau
      Accés obert
      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
      Accés obert
      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)
      Text en actes de congrés
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      ­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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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)
      Projecte Final de Màster Oficial
      Accés obert