A partir de 14h00
Amphithéâtre – Espace Conférences Inria
Centre de recherche Inria Rennes- Bretagne Atlantique
Campus de Beaulieu
« Coding for heterogeneous networks »
Résumé : The use of multiple interfaces in wireless systems promises improved resilience to impairments on any single wireless system and the ability to use effectively spare capacity in a real-time fashion. However, temporal aspects can render coordination across systems difficult. In particular, wide disparities in loss probabilities and RTTs must be accommodated. In this talk, we present three case studies of how network coding can be used to manage such temporal issues. The first setting presents the differentiated use of two wireless networks for progressive video download, whereby the more expensive system is called upon opportunistically to avoid a buffer under-run. The second scenario considers the use of two networks to manage delay-throughput trade-off, through coding, when networks are serving multiple devices. The final example presents the management of multi path coded TCP (CTCP), wherein coding is used across and within flows. We present common traits of these algorithms and highlight the design choices that arise from the different characteristics of the scenarios. This is joint work with Jason Cloud, Flavio du Pin Calmon, Chris Ng, Asuman Ozdaglar, Ali ParandehGheibi, Weifei Zeng.
« Wearable Sensors in Sport »
Résumé : In this talk I will present an overview of the work done in the CLARITY centre on using sensors in various sports applications. The presentation will include our use of off-the-shelf sensors which are freely available and used to measure aspects of the individual sportsperson – aspects like heart rate, respiration, galvanic skin response. I will also include a description of the novel sensors we have developed within CLARITY for measuring things like the composition of human perspiration (pH, sodium content, etc.) and the new sensing technologies we have for measuring respiration, movement and others. Finally, I will describe the work we are doing which is using sensors for measuring aspects of team sports, covering things like the locations of the players, the ball, an analysis of tactics or various « plays » in the game. To illustrate this I will present examples of work we do in CLARITY including solo sports like golf, archery or ultra-distance cycling, sports for pairs of players like tennis and boxing, and sports for teams of players like field hockey. These show the variety of the work in using sensors in sports in that some are contact and others non-contact, some are team and others individual, some are field and others indoor.
« Passive and Reconfigurable Integrated Antennas and Systems at Millimeter Waves »
Résumé : The millimetre-wave band (30-GHz – 300GHz) is about ten times broader than the centimetre wave one (3-GHz – 30-GHz). This large available bandwidth is thus favourable for many high data rate or high resolution communication and radar systems like broadband high data-rate indoor (smart home, gigabit offices) and outdoor wireless communication systems, wireless personal area networks in the 60-GHz band, radio over fibre systems, intelligent transport systems, and passive or active imaging / sensing, security and surveillance systems. Due to this very wide diversity of applications, many different kinds of mm-wave passive, active and integrated antenna modules and systems (e.g. systems on chip, systems in package) have been introduced over the last decade together with the development of new micro-technologies (e.g. MEMS). During the presentation, we will review some recent achievements on passive and reconfigurable planar / volumetric integrated antennas and systems at millimetre waves, with emphasis for operating frequencies below 100 GHz. A particular attention will be paid to several emerging applications (short range communications and Body Area Networks in the 60-GHz band, SatCom on the move in Ka-band, short range and long range automotive radars in the 77/79 GHz band).