Ara es mostren els items 64-83 de 115

    • Minimum channel spacing in an ofdm cpfsk optical coherent system 

      Prat Gomà, Josep Joan; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (1998-03)
      Article
      Accés restringit per política de l'editorial
      Channel spacing in optical frequency-division multiplexed (OFDM) coherent optical systems with continuous-phase frequency-shift-keying (CPFSK) is obtained both theoretically and experimentally. The bit error ratio is derived ...
    • Modelling and performance evaluation of a national scale switchless based network 

      Careglio, Davide; Solé Pareta, Josep; Junyent Giralt, Gabriel; Spadaro, Salvatore; Masip Torne, Jaume; Noguera Serra, Juan José (Springer, 2000)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In a packet switching based scenario, optical technologies can not completely overcome the problem of insufficient network capacity, due to limitations produced by the presence of electronic switches and regenerators in ...
    • Modelo estadístico del láser amplificador en un sistema de transmisión digital por fibra óptica monomodo 

      Ruiz Moreno, Sergio; Junyent Giralt, Gabriel (Fundación Universidad-Empresa, 1986)
      Text en actes de congrés
      Accés obert
      En este trabajo se obtiene un modelo estadístico del laser amplificador semiconductor y se desarrolla la metodología y el software necesarios para poder obtener resultados analíticos. En definitiva, se consigue conocer ...
    • NORMA: Network Operator Revenues Maximization 

      Velasco Esteban, Luis Domingo; Ruiz Ramírez, Marc; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE, 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A great part of core network operators’ gross profit comes from the provisioned connectivity services. In this work, we analyze the provisioning of differentiated services in current Shared Path Protection (SPP) environments. ...
    • Novel power efficient optical OFDM based on Hartley transform for intensity-modulated direct-detection systems 

      Svaluto Moreolo, Michela; Muoz, R.; Junyent Giralt, Gabriel (2010-03)
      Article
      Accés obert
      We present a novel optical orthogonal frequency division multiplexing (O-OFDM) scheme, suitable for intensity-modulated direct-detection systems, where the modulation/demodulation processing takes advantage of the fast ...
    • On the benefits of multi-path recovery in flexgrid optical networks 

      Castro Casales, Alberto; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (2014-12-01)
      Article
      Accés restringit per política de l'editorial
      We propose a new recovery scheme, called multi-path recovery (MPR), specifically designed for flexgrid-based optical networks. It combines protection and restoration schemes to jointly recover, in part or totally, the ...
    • On the performance of dynamic source aggregation of sub-wavelength connections in EONs 

      Sayyad Khodashenas, Pouria; Comellas Colomé, Jaume; Perelló Muntan, Jordi; Spadaro, Salvatore; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In elastic optical networks, heterogeneous traffic demands are typically supported by a single type of bandwidth-variable transmitters, which is not always spectrum and cost efficient. In light of this, we recently proposed ...
    • Optical filter cascading effects in a phase modulated coherent optical OFDM transmission system based on Hartley transform 

      Chochol, M.; Fàbrega Sánchez, Josep Maria; Svaluto Moreolo, Michela; Junyent Giralt, Gabriel (IEEE, 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Effects of cascading optical filters are investigated for a phase modulated coherent optical OFDM system based on Hartley transform. The evaluation is performed by means of numeric simulations in a 10 Gb/s system with a ...
    • Optical interconnection for datacenters: To switch or not to switch 

      Comellas Colomé, Jaume; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2023)
      Text en actes de congrés
      Accés obert
      Optical interconnection is seen as a promising solution to alleviate the congestion problems inside datacenters. Previously reported studies focus solely on optical circuit switching to establish connections. In this work ...
    • Optical monitoring system for scalable all-optical networks 

      Amrani, Abdelhafid; Roldán Andrade, Jesús; Junyent Giralt, Gabriel (THE INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, INC., 1997)
      Text en actes de congrés
      Accés obert
      High traffic and high capacity communications are believed to become cost-effective with the use of all-optical networks based on OFDM (optical frequency division multiplexing). In such networks, new strategies for OA and ...
    • Optical network net present value optimization in shared path protection environments 

      Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Comellas Colomé, Jaume; Junyent Giralt, Gabriel (IEEE Press. Institute of Electrical and Electronics Engineers, 2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Network operators are facing hard competition for opportunities in the telecommunications market, thus network investments must be carefully evaluated from the costs and revenues viewpoint before the decision making ...
    • Optimizing link spectrum occupancy in elastic optical networks 

      Comellas Colomé, Jaume; Ruiz Ramírez, Marc; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This work focuses on spectrum assignment in Elastic Optical Networks. The accurate study about spectrum occupancy in a flexgrid link is carried out. As a result, the probability values of finding different connection sizes ...
    • Path-based recovery in flexgrid optical networks 

      Castro Casales, Alberto; Ruiz Ramírez, Marc; Velasco Esteban, Luis Domingo; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (IEEE, 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      With the advent of flexgrid optical networks, the rigid wavelength-division multiplexing (WDM) technology will be enhanced by providing better spectrum efficiency and flexibility. In those future flexible optical networks, ...
    • Performance evaluation of a hybrid OBS/OCS network with QoS differentiation based on packet loss/delay requirements 

      Perelló Muntan, Jordi; Guinea, Nuria de; Spadaro, Salvatore; Junyent Giralt, Gabriel; Comellas Colomé, Jaume (2010)
      Text en actes de congrés
      Accés obert
      This paper introduces and evaluates a hybrid OBS/OCS switch for Quality of Service (QoS) differentiation in next-generation all-optical transport networks. Depending on their QoS requirements, incoming IP packets are ...
    • Performance monitor for all-optical networks based on homodyne spectroscopy 

      Amrani, A.; Junyent Giralt, Gabriel; Prat Gomà, Josep Joan; Comellas Colomé, Jaume; Ramdani, I.; Sales Zaragozá, Vicente; Rafel, A. (2000-11)
      Article
      Accés obert
      The ability to transparently detect performance degradations in all-optical networks is highly desirable. We present an optical signal monitor, based on a frequency supervision system, which can participate in some tasks ...
    • Performance of a FH multilevel FSK for mobile radio in the presence of nonsynchronous users 

      Agustí Comes, Ramon; Junyent Giralt, Gabriel (Institute of Electrical and Electronics Engineers (IEEE), 1982)
      Text en actes de congrés
      Accés obert
      This paper considers a Frequency Hopped Multilevel Frequency Shif Keying (FH-MFSK) spread spectrum communication system applied to mobile radio-telephony. We present a mobile-to-base transmission model that allows to study ...
    • Performance of an FH multilevel FSK for mobile radio in an interference environment 

      Agustí Comes, Ramon; Junyent Giralt, Gabriel (1983-06)
      Article
      Accés obert
    • Performance of FH-MFSK cellular mobile radio in the presence of nonsynchronous users 

      Agustí Comes, Ramon; Casadevall Palacio, Fernando José; Junyent Giralt, Gabriel (Institution of Electrical Engineers, 1983-12-08)
      Article
      Accés obert
    • Performance of FH-MFSK serial search synchroniser for mobile radio 

      Agustí Comes, Ramon; Junyent Giralt, Gabriel (Institution of Electrical Engineers, 1982-04-29)
      Article
      Accés obert
    • Performance of optical amplifier-fiber chains in coherent optical fiber transmission links 

      Junyent Giralt, Gabriel; Ruiz Moreno, Sergio (1987)
      Text en actes de congrés
      Accés obert
      This paper deals with the performances of a coherent optical fiber transmission link with linear optical amplifiers chains in which identical sections of attenuating fiber alternate with identical amplifiers. The overall ...