Exploració per tema "Multiplexatge per divisió de freqüència"
Ara es mostren els items 21-40 de 45
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Effective amplification of real WDM burst traffic using optical gain clamping
(2008-05-04)
Text en actes de congrés
Accés obertExperimental studies of real optical burst traffic in WDM systems are performed with optical gain clamping for stabilizing the EDFA amplification. Impairments of power variation due to burst are shown to be negligible. -
Experimental demonstration of a statistical OFDM-PON with multiband ONUs and elastic bandwidth allocation
(Institute of Electrical and Electronics Engineers (IEEE), 2015-01-01)
Article
Accés obertThe 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 ... -
Extending the flexgrid optical core towards the edges
(Institute of Electrical and Electronics Engineers (IEEE), 2013)
Text en actes de congrés
Accés restringit per política de l'editorialNational IP/MPLS network have being designed on top of fixed-grid DWDM optical networks so to spread out covering large areas. Besides, multilayer IP/MPLS-over-DWDM networks take advantage from grooming to achieve high ... -
Fairness-based dynamic sub-carrier assignment for real time services in OFDMA networks
(VDE Conference Publications, 2014)
Text en actes de congrés
Accés restringit per política de l'editorialFairness 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 ... -
Field-Trial of a high-budget, filterless, lambda-to-the-user, UDWDM-PON enabled by an innovative class of low-cost coherent transceivers
(2017-09-01)
Article
Accés obertWe experimentally demonstrate an innovative ultradense wavelength division multiplexing (UDWDM) passive optical networks (PON) that implements the full ¿-to-the-user concept in a filterless distribution network. Key element ... -
Grade of service in UDWDM-PON with statistical wavelength subscribing
(Institute of Electrical and Electronics Engineers (IEEE), 2018)
Text en actes de congrés
Accés restringit per política de l'editorialThe Grade of Service (GoS) or ONU rejection probability in coherent UDWDM-PONs with ONU lasers under limited tunability is evaluated. Each active ONU is assigned an exclusive wavelength channel, which is managed by heuristic ... -
High resolution DFB laser tuning for optical spectrum analysis in access networks
(Universitat Politècnica de Catalunya, 2022-06-16)
Projecte Final de Màster Oficial
Accés obertThe project revolves around the development of a low-cost, high-performance Optical Spectrum Analyzer (OSA) for Passive Optical Networks (PON). From the study of the mathematical model of the laser used for the sweeping ... -
Introduction to IP over WDM
(Springer, 2009-06-01)
Capítol de llibre
Accés restringit per política de l'editorialThe simple idea of having IP traffic directly transported over optical Wavelength Division Multiplexing (WDM) technology (“Internet Protocol (IP) over WDM”) has been envisioned as the future for the telecommunication ... -
Lightpath fragmentation for efficient spectrum utilization in dynamic elastic optical networks
(Institute of Electrical and Electronics Engineers (IEEE), 2012)
Text en actes de congrés
Accés obertThe spectrum-sliced elastic optical path network (SLICE) architecture has been presented as an efficient solution for flexible bandwidth allocation in optical networks. An homologous problem to the classical Routing and ... -
Long-term provisioning of radio resources based on their utilization in dense OFDMA networks
(Institute of Electrical and Electronics Engineers (IEEE), 2016)
Text en actes de congrés
Accés restringit per política de l'editorialThis paper presents long-term resource provisioning schemes for dense multi-cell OFDMA-based networks, where multiple cells with possibly overlapping coverage areas compete for the same set of resources. The optimization ... -
Multi-stream transmission in MIMO-FBMC systems
(Institute of Electrical and Electronics Engineers (IEEE), 2013)
Text en actes de congrés
Accés restringit per política de l'editorialThis paper addresses the design of MIMO precoding and decoding techniques for the filter bank multicarrier (FBMC) modulation. Existing solutions give satisfactory performance in scenarios with high coherence bandwidth ... -
Multilevel direct DFB phase modulation in 6.25 GHz spectrally spaced UDWDM PONs
(2016)
Presentació
Accés restringit per política de l'editorialDirect phase modulation of DFB is demonstrated with DPSK, DQPSK and Duobinary modulation formats and detected with an intradyne receiver based on a 120-degree hybrid. The system is tested in a 50 km fibre link with 6.25 ... -
Optimum carrier to signal power ratio for remote heterodyne DD-OFDM in PONs
(2013-07)
Article
Accés restringit per política de l'editorialThe carrier to signal power ratio (CSPR) in a directdetection optical orthogonal frequency division multiplexing (OFDM) system based on remote heterodyne scheme is optimized in a passive optical network (PON) downlink. ... -
Orthogonal Frequency Division Multiplexed Access for Passive Optical Networks: a hands-on training approach
(Universitat Politècnica de Catalunya, 2012-07-27)
Projecte Final de Màster Oficial
Accés obert[ANGLÈS] Research activities for new alternatives in ultra fast transmission over optical fiber networks are looking towards Orthogonal Frequency Division Multiplexing (OFDM) which is used in different modern communication ... -
Performance degradation of an OFDM-MIMO system with imperfect channel state information at the transmitter
(2003)
Text en actes de congrés
Accés obertIn this paper we analyze the performance degradation of a communications system combining the Orthogonal Frequency Division Multiplexing (OFDM) modulation with the simultaneous use of an array of antennas at both the ... -
Rayleigh backscattering rejection in single-laser homodyne transceiver for UD-WDM using λ-Shifting
(2021-04-01)
Article
Accés obertWith the aim of using a single laser per transceiver in single fiber splitter-based passive optical networks (PON) with coherent homodyne receivers, we apply wavelength shifting in an ultra-dense wavelength division ... -
Real burst traffic amplification in optically gain clamped amplifier
(2008-02-24)
Comunicació de congrés
Accés obertOptical burst amplification in a gain-stabilized amplifier is theoretically investigated using real burst traffic data. The results show that excellent performance are obtained for WDM transmission with negligible interplay ... -
Resource allocation in multi-antenna MAC networks: FBMC vs OFDM
(2011)
Text en actes de congrés
Accés restringit per política de l'editorialThis paper addresses the problem of resource allocation in a multiple access channel where several mobile terminals (MT’s) are transmitting simultaneously to a single receiving base station, all of them with multiple ... -
Restoration in optical cloud networks with relocation and services differentiation
(Institute of Electrical and Electronics Engineers (IEEE), 2016-02-01)
Article
Accés obertOptical cloud networks allow for the integrated management of both optical and IT resources. In this paradigm, cloud services can be provisioned in an anycast fashion; i.e., only the source node asking for a service is ... -
Robust non-linear precoding for downlink multiuser multiple-input multiple-output orthogonal frequency-division multiplexing systems with limited feedback
(2012-08-14)
Article
Accés restringit per política de l'editorialThe authors consider the robust Tomlinson–Harashima precoding (THP) for downlink multiuser multiple-input multiple-output orthogonal frequency-division multiplexing systems with quantised feedback. The authors discuss ...