CITI Talk: “Two Channels with Almost No Benefit from CSI”, by Ligong Wang, on 27th March

The next CITI talk will take place on 27th March at 3 pm in room TD-C.

This talk entitled “Two Channels with Almost No Benefit from CSI” will be presented by Ligong Wang.


For many communication channels, causal or noncausal channel-state information (CSI) at the transmitter can help to significantly increase their communication capacity. In this talk we discuss two channels for which this is not the case. The first is the very noisy channel. We show that noncausal CSI at the transmitter provides little additional capacity improvement over causal CSI. The second channel is the Poisson channel with random, time-varying dark current. On this channel, capacity improvement from both causal and noncausal CSI is shown to be negligible.

Speaker biography

Ligong Wang received the B.E. degree in electronic engineering from Tsinghua University, Beijing, China, in 2004 and the M.Sc. and Ph.D. degrees in electrical engineering from ETH Zurich, Switzerland, in 2006 and 2011 respectively. In the years 2011-2014, he was a Postdoctoral Associate at the Department of Electrical Engineering and Computer Science at the Massachusetts Institute of Technology, Cambridge, MA, USA . He is now a researcher (chargé de recherche) with CNRS, France, and is affiliated with ETIS laboratory in Cergy-Pontoise. His research interests include classical and quantum information theory, and digital, in particular optical communications.

CITI Talk: “Broadcasting with delayed CSIT: finite SNR analysis and heterogeneous feedback”, by Chao HE, on 15th March

The next CITI talk will take place on 15th March at 11 am in Amphi Chappe.

This talk entitled “Broadcasting with delayed CSIT: finite SNR analysis and heterogeneous feedback” will be presented by Chao HE.


One of the key techniques for future wireless networks, namely state-feedback enabled interference mitigation, is explored with information theoretical tools under some realistic settings. In order to verify the usefulness of delayed CSIT in harsh situations, we investigate it with finite SNR and/or feedback heterogeneity in a broadcast communication setup. In the first part of this talk, we are mainly interested in showing the finite SNR performance of delayed CSIT and the similarity between the results in Gaussian and erasure channels. Several relatively simple schemes are proposed in multi-user broadcast channels when states are assumed to be fully known at the destinations but only strictly causally at the transmitter. Enhancement in terms of higher symmetric rates and more input alphabet options are then characterized when analyzing the corresponding regions in Gaussian/erasure cases. In the second part of this talk, algorithms adapted to heterogeneous feedback are targeted as only part of communication nodes are involved in the feedback process. In particular, we concentrate on 1) broadcast channel with feedback from partial receivers, 2) broadcast relay channel with feedback at the relay. Improvements on achievable rates are justified in either cases via analysis and some examples.

Speaker biography

Chao He received his B.E. degree in Electrical Engineering from Southeast University in 2012, and the M.Sc. degree in SAR from Supélec in 2013. He obtained the Ph.D. degree from CentraleSupélec of Université Paris Saclay in 2016. His current research interests lie in the areas of multi-user information theory and limited feedback.

CITI Talk: “​​Challenges of a Reflective Platform”, by Stéphane Ducasse, on 24th November

The next CITI talk will take place on 24th November at 11 am in Amphi Chappe.

This talk entitled “Challenges of a Reflective Platform” will be presented by Stéphane Ducasse directeur de recherche at Inria-Lille..


Pharo is a live programming reflective dynamic language and environment. His tools are delivering an excellent programmer experience and are heavy user of its reflective abilities.
In this talk we will present briefly Pharo an immersive reflective platform and programming language ( and focused on:
(1) the problems we encounter daily (how to update core libraries while they are used to execute the updater itself, how can we get VM execution benefit from hot state right at system startup and without warming up, how can we isolate reflective parts of the system, what are the code representations we need to make happy the VMs and IDE)
(2) the infrastructure that we would like to have: since we are able to bootstrap the core of the system under 80 k, we can start thinking about multiple versions of the system coexisting, the question of the memory model is then important. Another question is how can we build a system where users can decide when they want to move code from one version to the other ones. Similarly, we would like to resume work on PharoNoOS and work on Xen hypervisor to gain benefit of hot hotspot and fast boot time.

Speaker biography

Stéphane is directeur de recherche at Inria. He has more than 20 years of experience in software maintenance. He leads the RMoD ( team. He is expert in two domains: object-oriented language design and reengineering.  He worked on traits, composable groups of methods. Traits have been introduced in  Pharo, Perl, PHP and  under a variant into Scala, Fortress of SUN Microsystems.  He is also expert on software quality, program understanding, program visualizations, reengineering and metamodeling. He is one of the developer of Moose, an open-source software analysis platform  He created a company building dedicated tools for advanced software analysis. He is one of the visionary core developers behind Pharo a new exciting reflective and immersive dynamically-typed language. According to google, his h-index is 49 for about 10 K citations. He is writing some new books around Pharo and having fun building a great and exciting system.

CITI Talk: “​​Who will drive cars ? Public Vehicles for Future Urban Transportation”, by Min-You Wu, on 8th November

The next CITI talk will take place on 8th November at 10.30 am in Amphi Chappe.

This talk entitled “Who will drive cars ? Public Vehicles for Future Urban Transportation” will be presented by Min-You Wu, from Shangai Jiao-Tong, China.


Urban transportation is undergoing a dramatic change. Conventional transportation consisting of private vehicles, taxis and buses will be substituted by trip service with autonomous vehicles. Transition from owning private vehicles to purchasing trip service is one of the most revolutionary changes in this century.
In this talk we discuss issues of autonomous trip services. We will discuss cost reduction of trip services. Three most important factors for low-cost trip services are manpower, energy and ridesharing. We focus on the ridesharing problem. We will discuss various techniques to increasing the sharing factor including passenger transfer, incentive mechanism and advanced booking.
We propose a new paradigm of transportation system for future smart cities, namely, Public Vehicles (PVs). With PVs, the number of vehicles as well as the required parking space will be significantly reduced. There will be less traffic congestion, less energy consumption and less pollution. The key issue of implementing an effective PV system is to design efficient planning and scheduling algorithms. We compare the PV system with conventional systems.

Speaker biography

Min-You Wu is a Professor in the Department of Computer Science and Engineering at Shanghai Jiao Tong University. He serves as the Chief Scientist at Grid Center of Shanghai Jiao Tong University. He is a research professor of the University of New Mexico, USA. His research interests include wireless and sensor networks, vehicular networks, multimedia networking, parallel and distributed systems, and compilers for parallel computers. He has published over 200 journal and conference papers in the above areas. His research has been supported by National Science Foundation, DoD, DoE, DARPA, China 863 program, China 973 program, Ministry of Education of China and Natural Science Foundation of China. He is a Vice Chair of Technical Committee of Computer Architecture, CCF. He is a senior member of IEEE and CCF.

CITI Talk: “​​Research presentation”, by Mohammad Rmayti, on 21st October

Mohammad RMAYTI, nouvel ATER IF/CITI, va présenter ses travaux de recherche dans le cadre d’un séminaire d’équipe DYNAMID, vendredi 21 octobre à 10h dans le pot de yaourt.


Avec l’évolution des besoins d’utilisateurs, plusieurs technologies de réseaux sans fil ont été développées. Parmi ces technologies, nous trouvons les réseaux mobiles ad hoc (MANETs) qui ont été conçus pour assurer la communication dans le cas où le déploiement d’une infrastructure réseaux est coûteux ou inapproprié. Dans ces réseaux, le routage est une fonction primordiale où chaque entité mobile joue le rôle d’un routeur et participe activement dans le routage. Cependant, les protocoles de routage ad hoc tel qu’ils sont conçus manquent de contrôle de sécurité. Sur un chemin emprunté, un nœud malveillant peut violemment perturber le routage en bloquant le trafic. Dans cette thèse, nous proposons une solution de détection des nœuds malveillants dans un réseau MANET basée sur l’analyse comportementale à travers les filtres Bayésiens et les chaînes de Markov. L’idée de notre solution consiste à évaluer le comportement d’un nœud en fonction de ses échanges avec ses voisins d’une manière complètement décentralisée. Par ailleurs, un modèle stochastique est utilisé afin de prédire la nature de comportement d’un nœud et vérifier sa fiabilité avant d’emprunter un chemin. Notre solution a été validée via de nombreuses simulations sur le simulateur NS-2. Les résultats montrent que la solution proposée permet de détecter avec précision les nœuds malveillants et d’améliorer la qualité de services de réseaux MANETs.


Après une Licence en Informatique à la Faculté des Sciences de l’Université Libanaise, j’ai fait mon Master 2 Recherche en Gestion des Risques dans les systèmes d’information à l’Ecole Doctorale de l’Université Libanaise. Intéressé par la sécurité de réseaux informatiques, j’ai effectué mon stage de recherche à l’Utt-Troyes sur la détection d’attaques DoS dans les réseaux VoIP. J’ai commencé ma thèse à l’UTT en codirection avec le Groupe Sécurité de Réseaux à Télécom ParisTech, qui portait sur la détection d’attaques DoS dans les réseaux mobiles ad hoc (MANETs). J’ai soutenu mes travaux de recherche le 30 septembre 2016.

CITI Talk: “​​Structured Interference Management: Fundamentals and Algorithms”, by Xinping Yi, on 19th October

The next CITI talk will take place on 19th October at 10 am in Amphi Chappe.

This talk entitled “Structured Interference Management: Fundamentals and Algorithms” will be presented by Xinping Yi,  research and teaching associate at Technische Universität Berlin.


In the future large-scale wireless internet of things, spectrum sharing calls for interference management techniques with low-complexity, low signaling overhead and flexible scalability. A pragmatic strategy is to focus on the underlying interference networks, exploiting the structural property of network topologies and the optimality of the simplest techniques of practical interest. In this talk, we focus on the fundamentals and algorithms of two practical interference management techniques — Treating Interference as Noise (TIN) and Topological Interference Management (TIM). The fundamental structural properties for their information-theoretic optimality in terms of (generalized) Degrees-of-Freedom (DoF) are revealed. The insights are also translated into the principles of algorithm design for spectrum sharing mechanisms in device-to-device communications, and edge caching in Fog-RAN under the TIM setting.


Xinping Yi has been a postdoctoral research associate in Technical University of Berlin, Berlin, Germany, since November 2014. He joined EURECOM, Sophia Antipolis, France in 2011 and received his Ph.D. degree from Telecom ParisTech, Paris, France, in October 2014. From 2009 to 2011, he was a research engineer at Huawei Technologies, Shenzhen, China. His research interests include information theory, signal processing, and machine learning, as well as their applications in wireless communications, content delivery networks and data analytics. X. Yi was a recipient of the 2014 Chinese Government Award for Outstanding Students Abroad.

CITI Talk: “Next Generation of Cellular Wireless Networks: Some Preliminary Results on QoE Consistency and Multiple Cell Selection”, by Catherine Rosenberg, on 12th July.

The next CITI talk will take place on 12th July at 11 am in TD-C.

This talk entitled “Next Generation of Cellular Wireless Networks: Some Preliminary Results on  QoE Consistency and Multiple Cell Selection” will be presented by Catherine Rosenberg, professor at the University of Waterloo.


Catherine will present preliminary results in next generation of cellular wireless networks on two topics.

The first topic is on the challenges of offering consistent Quality of Experience (QoE) in an environment where due to mobility, arrival and departures and time varying channels, the system state is highly stochastic.The second topic is on multiple cell selection. We aim at answering two questions: 1) how is performance improved? 2) how can it be implemented?

This work was done in collaboration with Fidan Mehmeti and Ararat Shaverdian.


Catherine Rosenberg is a Professor in Electrical and Computer Engineering at the University of Waterloo. Since June 2010, she holds the Tier 1 Canada Research Chair in the Future Internet. From 1999 to 2004, Prof. Rosenberg was a Professor in the School of Electrical and Computer Engineering at Purdue University.

Prof. Rosenberg is the President of the Scientific Advisory Board of Orange (formerly France-Telecom).  She was elected an IEEE Fellow for contributions to resource management in wireless and satellite networks on 2011 and a Fellow of the Canadian Academy of Engineering in 2013. Her research interests are mainly in three areas: the Internet, Wireless Networks, and Energy Systems.

CITI Tutorial: “Simultaneous Energy and Information Transmission”, by Selma Belhadj Amor and Samir Perlaza, on 17th June

This CITI tutorial will take place on 17th June from 3 to 5 pm in Amphi Chappe.

The talk entitled “Simultaneous Energy and Information Transmission” will be presented by Selma Belhadj Amor, postdoctoral researcher at Inria, and Samir Perlaza, researcher at Inria.

Selma and Samir have already presented this tutorial in ICT 2016 (Thessaloniki, Greece), European Wireless 2016 (Oulu, Finland), and CROWNCOM 2016 (Grenoble, France).


This tutorial aims to familiarize the attendees with the new communication paradigm of simultaneous energy and information transmission (SEIT) in wireless networks. It is divided into four parts:

In the first part, the relevance of SEIT is highlighted as a powerful technique to ensure a more efficient energy utilization in future “green” communication systems, e.g, 5G networks, small cells, Wi-Fi networks, sensor networks and ad hoc networks. 

In the second part, particular attention is paid to existing techniques for implementing SEIT in point-to-point wireless communications. In particular, power allocation and beamforming techniques are reviewed. At the same time, strong emphasis is put on the fundamental limits of this technology using basic notions from information theory. 

In the third part, multi-user scenarios are studied and the key aspects of the energy-information trade-off are studied in both centralized networks, e.g, cellular networks and decentralized networks, e.g., sensor networks and ad hoc networks. In the latter, basic notions of game theory are studied to model the stable operating points of these networks. 

In the final part, practical aspects are tackled putting an emphasis on the main future challenges of SEIT in the context of 5G. For instance, front-end architectures allowing both energy-harvesting and information decoding are studied. At the same time, aspects regarding in-band and out-band energy transmission as well as co-located and non-cololated receivers and energy harvesters are discussed.

CITI Talk: “A new approach for secure personal cloud” by Nicolas Anciaux, on 26th May

The next CITI talk will take place on 26th May at 11 am in Amphi Chappe. This seminar entitled “A new approach for secure personal cloud” will be presented by Nicolas Anciaux, researcher at INRIA, in the SMIS project.


In the current Web model, individuals delegate the management of their data to online applications, each storing and exploiting the data into their own Web data silo. No concrete guarantee is offered to the individual regarding the usage and dissemination of their personal information, which often lack of transparency and depend on the underlying business models.
Today, a large economical and political consensus emerges to reestablish the control of the individuals on their data and improve trust. The current centralized approach seems by essence incapable of closing the gap. The SMIS team addresses this issue through the paradigm of “Personal Data Stores”, where individuals manage their digital life from a secure and personal hardware platform. Our research focus on several important prerequisites. In particular, we design embedded data management techniques for tamper resistant components, we work on Privacy-by-Design architectures based on an ecosystem of smart objects, and we study privacy preserving data dissemination models and distributed computations for such architectures. The presentation will present architectural considerations, embedded data management techniques, and application examples, that we consider emblematic in this work.


Nicolas Anciaux is a researcher at INRIA, in the SMIS project which focuses on secured and mobile information systems. He received his PhD in 2004 and his French Habilitation in 2014 from University of Versailles. Before joining Inria, Nicolas was a post-doc researcher at University of Twente and studied database implementations of the “right-to-be-forgotten” in ambient intelligent environments. Since he joined INRIA in 2006, his research interests lie in the area of data management on specific hardware architecture, and more precisely on secure chips and embedded systems. He proposes architectures using secure hardware, and data structures and algorithms to manage personal data with strong privacy guarantees using tamper resistant hradware. He is a co-designer of PlugDB, a secure and personal database device. Since 2015, Nicolas co-animates the research activities of the privacy cluster of the Digital Society Institute which brings together economists, jurists and computer scientists.

CITI Talk: “Visible Light Communication for the Internet-of-Things” by Stefan Mangold, on 29th April

The next CITI talk will take place on the 29th of April at 11 am. This talk entitled “Visible Light Communication for the Internet-of-Things” will be presented by Stefan Mangold, founder of Lovefield Wireless (Switzerland) and associate professor with ETH Zurich.


Visible Light Communication (VLC) with Light Emitting Diodes (LEDs) as transmitters and receivers enables low bitrate wireless adhoc networking, which is an interesting approach for consumer electronics such as toys and related applications in the entertainment industry. LED-to-LED VLC networks with VLC devices communicating over free-space optical links achieve a throughput of a few kilobit per second at distances of up to ten meters. LED-to-LED VLC networks are useful for combining light bulbs and illumination with low-complex networking. In this talk, we present recent research achievements in this field, address open challenges, and demonstrate the performance of a software-based VLC physical layer and a VLC medium access control layer that retain the simplicity of the LED-to-LED approach.

Speaker biography

Stefan Mangold owns the Swiss tech company Lovefield Wireless, which assists the industry with product innovation and technology transfers. Stefan Mangold has been with Disney Research until 2016, where he guided a team to contribute to The Walt Disney Company’s wireless research (toys, theme parks, mobile networks). Before joining Disney in 2009, Stefan worked at Swisscom in Switzerland and before that, at Philips Research, NY, USA. His research covers many aspects of wireless communication, for example, protocols and system aspects for wireless LAN, visible light communication, and the Internet-of-Things. Other research interests include smart toys and play patterns, and magical experience designs for the entertainment industry. Stefan teaches a course at the ETH Zurich, publishes, and generates IPR in related areas. He received his Dr.-Ing. / PhD. degree in electrical engineering / telecommunications from RWTH Aachen University in Germany.