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.

Opto-electronic semiconductor device including an integrated mode transformer

Abstract: A semiconductor opto-electronic device including at least one electronic function component (62), at least one optical function component (60) and a mode transformer associated with the optical function component. At least some layers of semiconductor material constituting the electronic function component also form optical layers in the mode transformer zone and, at least in the mode transformer zone, these semiconductor material layers are non-absorbent at the operating wavelength. The mode transformer is preferably etched in the shape of an hourglass.

Traffic load management method, network and device

Abstract: A radiocommunication network includes a core network including primary and secondary nodes and a radio access network including radio controllers. Each primary node connects at least one secondary node, and each secondary node connects at least one radio controller via respective links. In relation to a given primary node, at least one entity in the radiocommunication network calculates respective target load reduction values for the links connecting the given primary node and secondary nodes, depending on an excess value between a current load of the given primary node and a primary node load threshold, and calculates respective target load reduction values for the links connecting said secondary nodes connected to the given primary node and radio controllers, depending on calculated target load reduction values. Actions are taken for changing traffic distribution by taking account of calculated target load reduction values.

A new class of iterative equalizers for space-time BICM over MIMO block fading multipath AWGN channel

Abstract: This paper addresses the issue of advanced equalization methods for space-time communications over multiple-input multiple-output block fading channel with intersymbol interference. Instead of resorting to conventional multiuser detection techniques (based on the straightforward analogy between antennas and users), we adopt a different point of view, and separate time equalization from space equalization, thus introducing a higher degree of freedom in the overall space-time equalizer design. Time-domain equalization relies on minimum mean-square error criterion and operates on multidimensional modulation symbols, whose individual components can be detected in accordance with another criterion. In particular, when the optimum maximum a posteriori criterion is chosen, substantial performance gains over conventional space-time turbo equalization have been observed for different transmission scenarios, at the price of an increased, albeit manageable, computational complexity.

On building hash functions from multivariate quadratic equations

Abstract: Recent advances in hash functions cryptanalysis provide a strong impetus to explore new designs. This paper describes a new hash function MQ-HASH that depends for its security on the difficulty of solving randomly drawn systems of multivariate equations over a finite field. While provably achieving pre-image resistance for a hash function based on multivariate equations is relatively easy, naive constructions using multivariate equations are susceptible to collision attacks. In this paper, therefore, we describe a mechanism--also using multivariate quadratic polynomials--yielding the collision-free property we seek while retaining provable pre-image resistance. Therefore, MQ-HASH offers an intriguing companion proposal to the provably collision-free hash function VSH.

Internet user behavior: compared study of the access traces and application to the discovery of communities

Abstract: With an ever-increasing emphasis on human activity (idea exchange, shopping, gaming, etc.) being mediated through the data network, the understanding of Internet users' behavior has become a rising challenge. Research dealing with the analysis and modeling of Internet user behavior can be roughly split in to two main approaches. The first is based on sociocognitive observation of users' practices in a standardized context. The second approach focuses on the analysis of productions and the traces of users' activity. This paper relates to the latter approach and presents a comparative analysis of Internet navigation traces (URLs versus keywords) to characterize individual or group-of-users' behavior when accessing the Web. The proposed models are based on the study of accesses redundancy seen as global static parameters and from the angle of time evolution. We also study the use of these models, in particular, to categorize a population of users in communities of interests. This study enables us to draw some conclusions on the compared performances of the two kinds of trace exploitation, as raw information, as well as the self-similar properties of the models.