Orange S.A.

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.

Pricing bridges to cross a river

Abstract: We consider a pricing problem in directed, uncapacitated networks. Tariffs must be defined by an operator, the leader, for a subset of $m$ arcs, the tariff arcs. Costs of all other arcs in the network are assumed to be given. There are $n$ clients, the followers, and after the tariffs have been determined, the clients route their demands independent of each other on paths with minimal total cost. The problem is to find tariffs that maximize the operator's revenue. Motivated by applications in telecommunication networks, we consider a restricted version of this problem, assuming that each client utilizes at most one of the operator's tariff arcs. The problem is equivalent to pricing bridges that clients can use in order to cross a river. We prove that this problem is APX-hard. Moreover, we analyze the effect of uniform pricing, proving that it yields both an $m$ approximation and a $(1 + lnD)$-approximation. Here, $D$ is upper bounded by the total demand of all clients. In addition, we consider the problem under the additional restriction that the operator must not reject any of the clients. We prove that this problem does not admit approximation algorithms with any reasonable performance guarantee, unless P = NP, and we prove the existence of an $n$-approximation algorithm.

WDM-PON with colorless ONUs

Abstract: This paper describes the interest of operators for WDM PON and more particularly with colorless ONUs. Operator needs are presented and techniques to obtain colorless ONUs are reviewed.

Multiple-sensor equalization in a radio receiver

Abstract: A method enabling a multiple sensor equalization in a radioelectrical receiver including a specified number of reception antennas, the method including the steps of estimating the transmission channel on each of the antennas; estimating the background noise component plus interference on each of the antennas on the basis of the estimation of the transmission channel; estimating the spatial correlation matrix referenced Rb of the background noise component plus interferences from the received signal; computing a spatial-temporal filter formed for each discrete temporal element of the estimated multiple-sensor channel of a spatial filter; achieving a temporal filtering of the data elements on the different sensors by the spatial-temporal filter; and equalizing the signal at output of the spatial-temporal filter by one-dimensional equalization at a symbol rate deciding the symbols transmitted

Process for the production of thin film transistors

Abstract: Process for the local passivation of a substrate by a hydrogenated amorphous carbon layer and process for producing thin film transistors on said passivated substrate. The local passivation process consists of producing photosensitive resin patterns (3) on the substrate (1), subjecting the structure obtained to a radio-frequency plasma essentially constituted by a hydrocarbon for thus depositing a hydrogenated amorphous carbon layer (6) on the structure and dissolving the resin patterns (3) in order to eliminate the amorphous carbon deposited on the resin, the amorphous carbon deposited on the substrate constituting the said passivation.

Device for representing a multiple-use comsumption ticket by means of a bar code

Abstract: A device for displaying a bar code to represent a multiple-use consumption ticket in respect of a product or service, the device comprising a terminal (10) comprising communications means (11) adapted to receive a message containing order data in respect of said product or service, and graphical output means (12) adapted to represent said multiple-use consumption ticket in the form of a bar code. The terminal (10) further comprises means (21, 22) for storing said order data, an indicator of use of the multiple-use consumption ticket, and data relating to the terminal (10) and to the user, a module (33) for transferring order data received by said communications means (11) to said storage means (21, 22) a bar code generation module (41) adapted to generate a bar code representing the product or service ordered based on the order data, the use indicator, and the data relating to the user, and an image conversion module (42) adapted to supply said consumption ticket to the graphical output means (12) of the terminal (10) by converting the bar code generated by the bar code generation module (41) as a function of the data relating to the terminal (10).