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Institution

Orange S.A.

CompanyParis, France
About: Orange S.A. is a company organization based out in Paris, France. It is known for research contribution in the topics: Terminal (electronics) & Signal. The organization has 6735 authors who have published 9190 publications receiving 156440 citations. The organization is also known as: Orange SA & France Télécom.


Papers
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Journal ArticleDOI
TL;DR: It is shown how several performance evaluation and optimization problems within this framework can actually be posed and solved by computing the mathematical expectation of certain functionals of point processes.
Abstract: This paper proposes a new approach for communication networks planning based on stochastic geometry. We first summarize the state of the art in this domain, together with its economic implications, before sketching the main expectations of the proposed method. The main probabilistic tools are point processes and stochastic geometry. We show how several performance evaluation and optimization problems within this framework can actually be posed and solved by computing the mathematical expectation of certain functionals of point processes. We mainly analyze models based on Poisson point processes, for which analytical formulae can often be obtained, although more complex models can also be analyzed, for instance via simulation.

367 citations

Journal ArticleDOI
TL;DR: The spin dynamics in self-organized InAs/GaAs quantum dots by time-resolved photoluminescence performed under strictly resonant excitation demonstrates that the carrier spins are totally frozen on the exciton lifetime scale.
Abstract: We have studied the spin dynamics in self-organized InAs/GaAs quantum dots by time-resolved photoluminescence performed under strictly resonant excitation. At low temperature, we observe strictly no decay of both the linear and the circular luminescence polarization. This demonstrates that the carrier spins are totally frozen on the exciton lifetime scale.

361 citations

Proceedings ArticleDOI
21 Mar 1999
TL;DR: It is proved that fixed size window control can achieve fair bandwidth sharing according to any of these criteria, provided scheduling at each link is performed in an appropriate manner.
Abstract: This paper concerns the design of distributed algorithms for sharing network bandwidth resources among contending flows. The classical fairness notion is the so-called max-min fairness; Kelly (see Europ. Trans. Telecom. vol.8 p.33-37, 1997) has previously introduced the alternative proportional fairness criterion; we introduce a third criterion, which is naturally interpreted in terms of the delays experienced by ongoing transfers. We prove that fixed size window control can achieve fair bandwidth sharing according to any of these criteria, provided scheduling at each link is performed in an appropriate manner. We next consider a distributed random scheme where each traffic source varies its sending rate randomly, based on binary feedback information from the network. We show how to select the source behaviour so as to achieve an equilibrium distribution concentrated around the considered fair rate allocations. This stochastic analysis is then used to assess the asymptotic behaviour of deterministic rate adoption procedures.

355 citations

Journal ArticleDOI
TL;DR: The feasibility of the KEOPS concept is assessed by modeling, laboratory experiments, and testbed implementation of optical packet switching nodes and network/node interfacing blocks, including a fully equipped demonstrator.
Abstract: This paper reviews the work carried out in the ACTS KEOPS (Keys to Optical Packet Switching) project, describing the results obtained to date. The main objective of the project is the definition, development, and assessment of optical packet switching and routing networks, capable of providing transparency to the payload bit rate, using optical packets of fixed duration and low bit rate headers in order to enable easier processing at the network/node interfaces. The feasibility of the KEOPS concept is assessed by modeling, laboratory experiments, and testbed implementation of optical packet switching nodes and network/node interfacing blocks, including a fully equipped demonstrator. The demonstration relies on advanced optoelectronic components, developed within the project, which are described.

354 citations

Patent
Didier Marquet1
08 Nov 2002
TL;DR: In this article, a portable device for electric power supply comprising of a power supply circuit (6, 16) and a battery (10) is described. But the battery is not connected to the power supply.
Abstract: The invention concerns a portable device for electric power supply comprising: connection means ( 8 ) for connecting an appliance ( 1 ) to be powered; and a power supply circuit ( 6; 16 ) supplying in output a supply voltage for the appliance when the circuit is selectively connected to a mains supply or to a low-voltage electric power source. It may also comprise a battery ( 10 ). In that case, the circuit ( 6, 16 ) can charge the power storage means when the circuit is connected to an appropriate electric power source, the connection means ensuring power supply to the appliance ( 1 ) from the power storage means ( 10 ).

354 citations


Authors

Showing all 6762 results

NameH-indexPapersCitations
Patrick O. Brown183755200985
Martin Vetterli10576157825
Samy Bengio9539056904
Aristide Lemaître7571222029
Ifor D. W. Samuel7460523151
Mischa Dohler6835519614
Isabelle Sagnes6775318178
Jean-Jacques Quisquater6533518234
David Pointcheval6429819538
Emmanuel Dupoux6326714315
David Gesbert6345624569
Yonghui Li6269715441
Sergei K. Turitsyn6172214063
Joseph Zyss6143417888
Jean-Michel Gérard5842114896
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20238
20225
20215
20205
201915
201814