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Academic literature on the topic 'Systèmes de communication sans fil – Innovation'
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Journal articles on the topic "Systèmes de communication sans fil – Innovation"
Troël, Arnaud, Frédéric Weis, and Michel Banâtre. "Prise en compte du mouvement dans les systèmes de communication sans fil." Techniques et sciences informatiques 24, no. 1 (January 1, 2005): 65–94. http://dx.doi.org/10.3166/tsi.24.65-94.
Full textGesbert, David. "La 6G : promesses et défis à l’horizon 2030." Annales des Mines - Enjeux numériques 27, no. 3 (September 27, 2024): 59–64. http://dx.doi.org/10.3917/ennu.027.0059.
Full textAymen Labiod, Mohamed, Noureddine Doghmane, Amira Boulmaiz, and Mouhamadou Mansour Gueye. "Initiation aux systèmes embarqués à travers la mise en oeuvre de Réseaux de Capteurs Sans Fil (RCSF)." J3eA 21 (2022): 2054. http://dx.doi.org/10.1051/j3ea/20222054.
Full textFlavia Irene, Santamaria,. "“Un estudio multimodal y dinámico de los conocimientos numéricos de estudiantes de primer grado”." RIDAA Tesis Unicen, September 27, 2021. http://dx.doi.org/10.52278/2850.
Full textDissertations / Theses on the topic "Systèmes de communication sans fil – Innovation"
Claudel, Servane. "Processus d'innovation pour la sécurité des données dans les réseaux sans fil : stratégie d'innovation et valorisation : application à un projet dans l'UWB." Besançon, 2003. http://www.theses.fr/2003BESA2037.
Full textIn this report, we will discuss the need to develop a multidimensional strategy that will allow you to move to a planned, staged approach that will increase your chances of success. We will explain about novel, creative approach to manage an early stage project with another look, less technical. This approach is based on our own risk framework for valuing innovative project that will help scientists who want to create a spin off or a start up from their public or private research. The major hurdle facing the entrepreneurs in the 'real' technology innovation arena today, is how to access funds to finance the Early-Stage R&D. Based on our studies of an early stage project in new wireless technology Ultra Wide Band, we explain the impact of standards, of innovation diffusion process, of intangible assets valuation, of R&D issues on the decision making process. Early stage project in new technologies requires seed funds that will help the founders to convert their ideas to a stage that can attract VC funds and then finance the different stages of development before research is stabilized and can be put to production. Our aim is to show the importance of such factors, epecially in early stage innovative project
Mishra, Debashisha. "Exploiting the synergies of unmanned aerial vehicles (UAVs) and 5G network." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0058.
Full textAs an expanding subject of aerial robotics, Unmanned Aerial Vehicles (UAVs) have received substantial research attention within the wireless networking research community. As soon as national legislations enable UAVs to fly autonomously, we will witness swarms of UAV filling the skies of our smart cities to complete diverse missions: package delivery, infrastructure monitoring, event videography, surveillance, tracking, etc. Fifth generation (5G) and beyond cellular networks can improve UAV communications in a variety of ways and thus benefit the UAV ecosystem. There is a wide variety of wireless applications and use cases that can benefit from the capabilities of these smart devices, including the UAV's inherent characteristics of agile mobility in three-dimensional space, autonomous operation, and intelligent placement. The broad goal of this thesis is to provide a comprehensive analysis of the synergies that may be realized when combining 5G and beyond cellular networks with UAV technology. This thesis presents four types of UAV and cellular ecosystem integration models. "UAV-assisted cellular paradigm" refers to communication scenarios in which UAVs are used as flying (or aerial) base stations or as relays to augment current terrestrial cellular connectivity or to mitigate disaster situations. The "cellular-assisted UAV paradigm" foresees the integration of UAVs into the current cellular network as a new aerial user (flying UE) to serve a wide variety of applications and use cases. The "UAV-to-UAV paradigm" stresses the collective strength of a fleet of UAVs as a swarm and communication amongst UAVs inside the swarm. The "hybrid non-terrestrial paradigm" encompasses satellite and aerial networks, therefore examining the whole spectrum of communication links from the ground to the air to the space in the form of an integrated space-air-ground communication network. Initially, this thesis focuses on aerial base stations, which have gained great academic attention in order to provide flexible, on-demand communication services to ground users. On this occasion, we build and construct a proof-of-concept prototype platform that delineates the design components required to implement such platforms in the real world, and we then explain the necessity for optimal placement of aerial base stations for increasing communication services. To support a heterogeneous class of 5G services from various vertical industries (referred to as tenants of 5G network operators), we propose a slicing-aware aerial base station framework in which ground users with differentiated traffic requirements in terms of data rate, latency, and massive deployment are supported through intelligent resource provisioning. Second, we describe aerial users who are supported by current cellular infrastructure and examine difficulties such as coexistence of aerial users and ground users, handovers, and communication-aware trajectory optimization. The use of a swarm of UAVs is considerably more cost-effective as compared to a single UAV conducting a mission when considering realistic mission goals. A swarm of UAVs opens up new opportunities for new services and applications since the UAVs may independently coordinate their operations and work together to complete a given task. Due to the spatio-temporal dynamics of swarm topology, dependable network development with seamless communication amongst UAVs is essential for any operation to be successful. As part of this thesis, we offer centralized and decentralized network models for UAV-to-UAV (U2U) communication inside swarm and conduct a full investigation of sidelink-assisted U2U communication with performance assessment
Bouyedda, Abdellatif. "Optimisation de la chaîne de transmission radio en bande ISM pour des applications IoT, notamment en agriculture connectée." Electronic Thesis or Diss., Limoges, 2024. http://www.theses.fr/2024LIMO0116.
Full textThis thesis examined innovative solutions to optimize the connectivity and performance of connected objects, particularly focusing on connected agriculture, where ensuring connectivity is crucial. By analyzing LPWAN and satellite technologies, we demonstrated that hybrid connectivity represents a promising approach to covering white zones, especially in isolated rural areas. A satellite communication antenna prototype was designed to ensure effective reception with the Kinéis constellation, while a frequency-reconfigurable antenna was developed to facilitate flexible communications between terrestrial and satellite networks. Additionally, the enhancement of a TPMS system, specifically aimed at agricultural machinery, significantly increased the sensitivity and robustness of the system, thus meeting the requirements of applications in challenging environments. Despite certain challenges related to manufacturing complexity, this research lays a solid foundation for IoT solutions tailored to the specific needs of connected agriculture and opens perspectives for other sectors requiring coverage in remote areas
Haj, Hmida Wafa. "Affectation de pilotes dans la liaison descendante des systèmes de télécommunication sans cellule." Thesis, Limoges, 2020. http://aurore.unilim.fr/theses/nxfile/default/0fd5c3e4-7bba-4783-9a5e-f033b34aa0e9/blobholder:0/2020LIMO0079.pdf.
Full textIn Cell-Free massive Multiple-Input-Multiple-Output (Cell-Free massive MIMO) systems, we distribute in a coverage area a massive number of access points, mastered by central processing units (CPUs), to simultaneously serve much smaller number of user equipments (UEs) over the same time/frequency resources. In contrast to the centralized massive MIMO, cell-free massive MIMO is characterized by a channel hardening not sufficiently accentuated, thus, it will be appropriate to include downlink (DL) pilots to estimate the DL channel. This thesis considers a DL pilot assignment for the cell-free massive MIMO systems by defining a metric, involving the inter-user interference (IUI). This metric gives insights about DL pilot contamination. A threshold is then defined to optimize the number of DL pilots, which maximizes the minimum per-user DL throughput. This approach gives a conflict graph, where each UE is regarded as a vertex of the graph. It consists in a combinatorial optimization problem that can be approximated using a graph coloring algorithm. It is a greedy algorithm whose steps are described as follows. By fixing the adequate threshold, maximizing the minimum per-user DL throughput, a conflict or interference graph is constructed. It models the potential interference among interfering UEs, the UEs between which there is an edge are in conflict, i.e., present a high IUI. Then, the proposed scheme mitigates the potential IUI by appointing different DL pilots to connected UEs with high IUI and same DL pilots to UEs with low IUI in the conflict graph in accordance with some coloring rules. The simulation results validate that the minimum per-user DL throughput based on the proposed approach outperforms the conventional methods, i.e., statistical channel state information, the orthogonal and the random pilot assignment in the DL training. Our analysis underlines also the reduction of the DL pilot overhead ratio using the DL pilot assignment based on our proposed scheme, compared to the conventional methods aforementioned
Khoder, Rami. "Etude de la mobilité et de la qualité de service des communications véhiculaires optiques." Electronic Thesis or Diss., université Paris-Saclay, 2021. http://www.theses.fr/2021UPASG045.
Full textThe thesis topic is a part of the global interest in wireless vehicular networks. Over the past decade, the number of road accidents has increased quickly with the growth of the automotive sector. Statistics have demonstrated that the high number of accidents on the road is primarily due to the high traffic density and the lack of information about other drivers' decisions. Recent studies have shown the importance of vehicular communications, which allow the exchange of real-time traffic safety information between vehicles and thus contribute to accidents avoidance.Through vehicular communication, known as vehicle-to-everything (V2X), which includes vehicle-to-vehicle (V2V) and vehicle-to-infrastructure, vehicles can exchange road safety and traffic management messages with low latency. Platoon formation is considered an interactive option that can improve V2X communication and ensure more safety. The vehicle platoon is defined as a group of vehicles following each other, moving in a straight line with a very short inter-vehicle space. Several vehicle platoon formation strategies have been defined in order to manage the platoon's lifetime and stability. However, none of these strategies has taken into account traffic congestion and speed constraints.The first objective of our work is to propose a new platoon formation algorithm called speed platoon splitting (SPS) where vehicles are grouped according to their destination (the leading vehicle has the farthest destination and the latest vehicle has the nearest destination). The main purpose of SPS is to target alleviating congestion by using a ticket pool and classify platoons according to their velocity in two different lanes. Performance analysis shows that SPS provides platoon stability and reduces highway congestion.V2X communications can be achieved via radio frequency (RF) technologies, especially the 802.11p standard. However, due to the accelerated growth in the number of devices, this technology suffers from several problems such as high latency and channel congestion. An alternative communication solution is provided by visible light communication (VLC). VLC is the usage of visible light as a wireless data transmission technique. VLC reduces complexity and cost, enables high precision positioning and increases network scalability and security.The second objective of this thesis tackles the performance of VLC in V2V among the platoon members. For this purpose, we considered two mathematical models validated by simulations for two different scenarios (we have taken an M/M/1 and an M/GI/1 queues for the first and the second scenarios respectively). The performance evaluations present a detailed study of the VLC in the presence of disruptive vehicles and they are used to derive computations of the Quality of Service parameters. The main conclusion drawn is that VLC technology is considered an efficient technique but it is affected by disruptive vehicles.The third objective of the thesis focuses on proposing a mechanism for vertical handover (VHO) between VLC and RF technologies. This objective is composed of two parts, the first one is based on the threshold value to make a vertical handover decision or by using machine learning techniques. The second part is to choose the appropriate technology after VHO using the utility function or the cooperative game.Throughout the thesis, the performance evaluation of the VLC is based on mathematical modelling. Moreover, the simulation is performed to validate this mathematical modelling
Mouawad, Mina Rady Abdelshahid. "Agile Multi-PHY Wireless Networking." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS462.
Full textThis thesis contributes to the emerging field of agile multi-PHY wireless networking. Industrial wireless networks have relied on a single physical layer for their operation. One example is the standardized IETF 6TiSCH protocol stack for industrial wireless networking, which uses IEEE~802.15.4 O-QPSK radio in the 2.4~GHz band as its physical layer. Advances in radio chip manufacturing have resulted in chips that support a diverse set of long range and short range PHYs. We use the term "PHY'' to refer to any combination of: modulation, frequency band, and coding scheme. In this research, we argue that combining long-range and short-range PHYs can offer balanced network end-to-end performance that no single PHY achieves. We demonstrate how a set of short-range and long-range PHYs can be integrated under one generalized 6TiSCH ("g6TiSCH'') architecture and we evaluate its performance experimentally in a testbed of 36~motes at Inria-Paris. We further demonstrate, experimentally, how a TSCH slotframe can adapt the slot duration on a slot-by-slot basis, as a function of the bitrate of the used PHY ("6DYN''). Finally, we design and evaluate, through simulation, an objective function for RPL that optimizes for network lifetime ("Life-OF''). We demonstrate how Life-OF combines diverse PHYs to boost network lifetime to be up to 470% compared to the IETF standard MRHOF
Chebbi, Samar. "Massive access for 5G networks and beyond." Electronic Thesis or Diss., Limoges, 2025. http://www.theses.fr/2025LIMO0003.
Full textThis thesis addresses the challenges posed by the design and optimization of MIMO-NOMA wireless communication systems in fifth (5G) and sixth-generation (6G) networks. These technologies are pivotal for modern applications requiring Ultra-Reliable Low-Latency Communication (uRLLC), such as autonomous vehicles, industrial automation, and augmented reality systems. The main objective of this thesis is to develop advanced techniques for resource management, delay reduction, and energy efficiency enhancement in a context where a large number of users simultaneously share network resources. First, the thesis presents a comprehensive literature review covering the fundamentals of Non- Orthogonal Multiple Access (NOMA) and MIMO systems, along with recent advancements in uRLLC communication. Next, innovative algorithms for user clustering and power allocation, based on latency and spatial correlation, are proposed. These algorithms prioritize users based on their Quality of Service (QoS) requirements and minimize inter-cluster interference. Additionally, a framework for delay modeling and simulation in MIMO-NOMA systems is developed, incorporating realistic scenarios where data packets are transmitted according to their delay constraints. The simulation results demonstrate significant improvements in reducing average delay, increasing the number of users served, and enhancing energy efficiency compared to existing methods. Moreover, the comparative analysis reveals that leveraging spatial correlation and latency-based clustering approaches better meets the demands of time-critical applications. These findings contribute substantially to the design of 5G/6G networks by offering solutions that address the challenges of massive low-latency communications and high-density user environments
Kelif, Jean-Marc. "Modèles fluides de réseaux sans fil." Paris, ENST, 2008. https://pastel.hal.science/pastel-00004761.
Full textSouilmi, Younès. "Communication sans fil utilisant une signalisation ultra large bande." Paris, ENST, 2005. http://www.theses.fr/2005ENST0033.
Full textUWB is a new emerging technology which promises to bring a real revolution in the field of WLAN communications. UWB is based on a shift in spectrum management paradigm which consists on allowing users to transmit over a shared bandwidth of several GHz rather than allocating private bandwidth to each user. No significant interference is caused to other UWB users nor to other systems coexisting on the same frequency bandwidth thanks to a constrain on the transmitted power spectral density. Given the huge bandwidth used by UWB systems, the latter operates in the low spectral efficiency regime. In our work we investigate the impact of UWB characteristics on the design of adequate signalling and coding schemes. Motivated by the fact that channel knowledge is not required to achieve channel capacity for vanishing spectral efficiency, we consider non-coherent type of detection. We first evaluate the performance of practical non-coherent schemes using on-off signalling. We then investigate the impact of channel estimation, made possible by channel stationary, on system performance and show at which extinct practical coherent UWB systems can outperform non-coherent ones. Later we introduce a multi-carrier UWB signalling scheme which generalizes the concept of on-off signalling to the time-frequency 2-dimentional signalling space. We analyze the performance of this signalling scheme by deriving lower and upper bounds on its achievable data rates over the set of all frequency taps correlation profiles. We then consider UWB on-off signalling in the context of peer-to-peer multiple access networks. We propose a quantized threshold-based non-coherent receiver whose performance is shown
Tlais, Mazen. "Architecture sans fil discontinue : problématiques, conception et évaluation." Rennes 1, 2008. ftp://ftp.irisa.fr/techreports/theses/2008/tlais.pdf.
Full textDans le domaine des réseaux mobiles, les progrès en matière de technologie de communication sans fil permettent d'envisager la mise en oeuvre d'applications réclamant des débits importants. Le plus souvent, les utilisateurs sont maintenant équipés de terminaux munis d'interface de communication sans fil et de fonctions de captures numériques (comme un appareil photo par exemple), avec lesquels ils souhaitent pouvoir regarder des films, ou bien encore capturer et stocker des photos et des séquences vidéo. De telles applications peuvent rapidement consommer la bande passante disponible dans l'infrastructure de communication. Dans ce contexte, les débits fournis par les réseaux mobiles actuels, en plus d'être d'un coût élevé, ne sont pas, le plus souvent, suffisants pour servir un grand nombre d'utilisateurs. L'objectif de cette thèse est de proposer et d'évaluer une architecture de réseau mobile offrant un haut débit, et ce pour un faible coût de déploiement. Cette architecture doit permettre à une densité élevée d'utilisateurs d'échanger des quantités importantes de données avec des serveurs applicatifs, et ce sans dégrader la qualité de service. Notre contribution repose sur trois parties. Dans un premier temps, nous proposons une architecture en mesure de fournir des transferts haut débit, pour des faibles coûts de déploiement. Cette architecture s'appuie sur une interconnexion de cellules radio de tailles réduites et n'offrant pas une couverture continue. On parle alors de réseau à couverture discontinue. Dans un deuxième temps, nous validons le fonctionnement de cette architecture pour les flux descendants et montants. Dans un troisième temps, nous décrivons les problèmes posés par un déploiement grande échelle du réseau proposé, et nous présentons des solutions adaptées
Books on the topic "Systèmes de communication sans fil – Innovation"
Banlue, Srisuchinwong, Surakampontorn Wanlop, and Tantaratana Sawasd, eds. Circuits for wireless communications: Selected readings. Piscataway, NJ: IEEE, 2001.
Find full textVincent, Poor H., ed. Wireless communication systems: Advanced techniques for signal reception. Upper Saddle River, NJ: Prentice Hall PTR, 2004.
Find full text1954-, Golio John Michael, ed. Microwave and RF product applications. Boca Raton: CRC Press, 2003.
Find full textM, Correia Luis, and European Cooperation in the Field of Scientific and Technical Research (Organization), eds. Mobile broadband multimedia networks: Techniques, models and tools for 4G. Amsterdam: Elsevier/Academic Press, 2006.
Find full textPrasad, Ramjee. Universal wireless personal communications. Boston, Mass: Artech House, 1998.
Find full text1970-, Holma Harri, and Toskala Antti, eds. WCDMA for UMTS: Radio access for third generation mobile communications. Chichester, Eng: Wiley, 2000.
Find full textSyed, Ahson, and Ilyas Mohammad 1953-, eds. The WiMAX handbook. Boca Raton, Fla: CRC Press, 2008.
Find full textLu, Yan, ed. The Internet of things: From RFID to the next-generation pervasive networked systems. Boca Raton, FL: Taylor & Francis, 2008.
Find full textCavalcanti, Francisco Rodrigo Porto, and Sören Andersson. Optimizing Wireless Communication Systems. Springer, 2009.
Find full textCavalcanti, Francisco Rodrigo Porto, and Sören Andersson. Optimizing Wireless Communication Systems. Springer, 2014.
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