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.

Map-aided indoor mobile positioning system using particle filter

Abstract: A framework for positioning and tracking problems in indoor environments using particle filters has been developed and applied to a WLAN location determination technique. The use of particle filtering represents an interesting way to handle the variations of the signal strength measurements. It can also aggregate in a simple way different information like signal strength and the map of a building. This type of information is very useful to obtain correct trajectories without wall-crossings. Constraining this filter on a Voronoi diagram of the building decreases the complexity of the method and improves its stability as the particles cannot be trapped in a room. In this paper, particle filtering and its constraint on a Voronoi diagram are presented, with their performances in indoor environments by combining WLAN signal strength and fingerprinting.

AnyBody: a self-organization protocol for body area networks

Abstract: Self-organization for wireless multi-hop systems can be divided into two categories: proactive cluster-based solutions and reactive on-demand solutions. Whereas the former have been studied for ad-hoc networks, the latter seem more adapted to low-energy low-traffic wireless sensor networks. We show that, despite the relative high cost to build and maintain a topology, a cluster-based approach is particularly suited for Body Area Networks. We present AnyBody, a self-organization protocol in which sensors attached to a person are grouped into clusters.

A new direction for quality of service: flow-aware networking

Abstract: In this paper we present the architectural implications of flow-aware networking, or FAN, a new approach for realizing QoS guarantees. FAN performs traffic control based on user-defined flows using implicit admission control and per-flow scheduling. This allows adequate performance guarantees for streaming and elastic flows without requiring class of service distinction or relying on signalled traffic specifications. We argue that FAN is a new direction for Internet quality of service that is arguably necessary as an alternative to flawed classical architectures and sufficient to meet user performance requirements in a cost-effective way.

Cross-protect: implicit service differentiation and admission control

Abstract: In this paper we present Cross-protect, a combination of router mechanisms allowing quality of service differentiation while maintaining the simple user-network interface of the best effort Internet. By associating implicit flow level admission control and per-flow fair queuing in a router it is possible to distinguish streaming and elastic flows and meet their respective quality requirements without requiring specific packet marking. We describe the implied mechanisms and justify the claimed performance and scalability properties by means of simulation and analysis.

ITU-T G.729.1: AN 8-32 Kbit/S Scalable Coder Interoperable with G.729 for Wideband Telephony and Voice Over IP

Abstract: This paper describes the scalable coder - G.729.1 - which has been recently standardized by ITU-T for wideband telephony and voice over IP (VoIP) applications. G.729.1 can operate at 12 different bit rates from 32 down to 8 kbit/s with wideband quality starting at 14 kbit/s. This coder is a bitstream interoperable extension of ITU-T G.729 based on three embedded stages: narrowband cascaded CELP coding at 8 and 12 kbit/s, time-domain bandwidth extension (TDBWE) at 14 kbit/s, and split-band MDCT coding with spherical vector quantization (VQ) and pre-echo reduction from 16 to 32 kbit/s. Side information - consisting of signal class, phase, and energy - is transmitted at 12, 14 and 16 kbit/s to improve the resilience and recovery of the decoder in case of frame erasures. The quality, delay, and complexity of G.729.1 are summarized based on ITU-T results.