Contents
Academic literature on the topic 'Capteurs Wi-Fi'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Capteurs Wi-Fi.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Capteurs Wi-Fi"
Lemos, André. "Pervasive Computer Games and Processes of Spatialization: Informational Territories and Mobile Technologies." Canadian Journal of Communication 36, no. 2 (August 4, 2011). http://dx.doi.org/10.22230/cjc.2011v36n2a2187.
Full textDissertations / Theses on the topic "Capteurs Wi-Fi"
Ta, Viet-Cuong. "Smartphone-based indoor positioning using Wi-Fi, inertial sensors and Bluetooth." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAM092/document.
Full textWith the popularity of smartphones and tablets in daily life, the task of finding user’s position through their phone gains much attention from both the research and industry communities. Technologies integrated in smartphones such as GPS, Wi-Fi, Bluetooth and camera are all capable for building a positioning system. Among those technologies, GPS has approaches have become a standard and achieved much success for the outdoor environment. Meanwhile, Wi-Fi, inertial sensors and Bluetooth are more preferred for positioning task in indoor environment.For smartphone positioning, Wi-Fi fingerprinting based approaches are well established within the field. Generally speaking, the approaches attempt to learn the mapping function from Wi-Fi signal characteristics to the real world position. They usually require a good amount of data for finding a good mapping. When the available training data is limited, the fingerprinting-based approach has high errors and becomes less stable. In our works, we want to explore different approaches of Wi-Fi fingerprinting methods for dealing with a lacking in training data. Based on the performance of the individual approaches, several ensemble strategies are proposed to improve the overall positioning performance. All the proposed methods are tested against a published dataset, which is used as the competition data of the IPIN 2016 Conference with offsite track (track 3).Besides the positioning system based on Wi-Fi technology, the smartphone’s inertial sensors are also useful for the tracking task. The three types of sensors, which are accelerate, gyroscope and magnetic, can be employed to create a Step-And-Heading (SHS) system. Several methods are tested in our approaches. The number of steps and user’s moving distance are calculated from the accelerometer data. The user’s heading is calculated from the three types of data with three methods, including rotation matrix, Complimentary Filter and Madgwick Filter. It is reasonable to combine SHS outputs with the outputs from Wi-Fi due to both technologies are present in the smartphone. Two combination approaches are tested. The first approach is to use directly the Wi-Fi outputs as pivot points for fixing the SHS tracking part. In the second approach, we rely on the Wi-Fi signal to build an observation model, which is then integrated into the particle filter approximation step. The combining paths have a significant improvement from the SHS tracking only and the Wi-Fi only. Although, SHS tracking with Wi-Fi fingerprinting improvement achieves promising results, it has a number of limitations such as requiring additional sensors calibration efforts and restriction on smartphone handling positions.In the context of multiple users, Bluetooth technology on the smartphone could provide the approximated distance between users. The relative distance is calculated from the Bluetooth inquiry process. It is then used to improve the output from Wi-Fi positioning models. We study two different combination methods. The first method aims to build an error function which is possible to model the noise in the Wi-Fi output and Bluetooth approximated distance for each specific time interval. It ignores the temporal relationship between successive Wi-Fi outputs. Position adjustments are then computed by minimizing the error function. The second method considers the temporal relationship and the movement constraint when the user moves around the area. The tracking step are carried out by using particle filter. The observation model of the particle filter are a combination between the Wi-Fi data and Bluetooth data. Both approaches are tested against real data, which include up to four different users moving in an office environment. While the first approach is only applicable in some specific scenarios, the second approach has a significant improvement from the position output based on Wi-Fi fingerprinting model only
Fabre, Léa. "Contributions and Opportunities of Wi-Fi Data to Improve Transport Demand Knowledge / Utilisation de données Wi-Fi, quels apports pour la connaissance de la demande de transport?" Electronic Thesis or Diss., Lyon 2, 2024. http://www.theses.fr/2024LYO20011.
Full textDue to its social, environmental and economic importance, mobility plays a key role in urban landscapes. In particular, public transportation is critical to the smooth functioning of cities. Therefore, public transportation systems must be planned to operate properly and efficiently. To this end, it is of paramount importance to have a great knowledge of the mobility demand, especially in an evolving world. The world today is facing a significant demographic growth along with urban sprawl, which implies an increasing demand for transportation in the cities. In addition, travel patterns are diversifying and becoming less regular, mainly due to the emergence of new modes of transport. The data traditionally used for public transportation planning are inadequate to reflect these changes in mobility behaviors. The development of information technologies, digitization and the data science boom can bring interesting benefits to the forecasting of transport demand. The development of new tools and algorithms, such as artificial intelligence, contributes to the diversification and complexity of models to improve the prediction of mobility behaviors. In parallel, we are currently witnessing the diversification of data sources used in mobility analyses. Among them, Wi-Fi data are very promising. These data have significant advantages when used in transportation planning (they provide information on Origin-Destination trips, they are collected continuously and passively…). However, Wi-Fi data also have some drawbacks. Therefore, they require further processing to be used in demand forecasting models. As a new way of collecting mobility data, questions remain about the quality of the data, their contribution, and how they can be used. The objective of this thesis is to provide a data-driven approach to the use of Wi-Fi data for mobility behaviors. In this thesis, we therefore propose solutions to process this interesting data source. A methodology is presented to filter the parasite signals detected by Wi-Fi sensors in order to keep only the passenger signals and construct relevant Origin-Destination matrices. Scaling of the Wi-Fi data to avoid errors in the predicted total number of trips due to undetected Wi-Fi devices is also handled. In the end, we provide Origin-Destination matrices that are relevant to the structure of the trips and complete in trip volumes. In addition, we propose a modeling to quantify the error between the Origin-Destination matrix produced by Wi-Fi data and real Origin-Destination trips, despite the non-continuous availability of the latter. Some applications of the use of Wi-Fi data are also presented. In conclusion, the results of this thesis show that interesting insights into mobility behaviors can be derived from Wi-Fi data, continuously and at low cost
Mahfoudi, Mohamed Naoufal. "Libérer le potentiel de détection sans fil dans les réseaux Wi-Fi et IoT." Thesis, Côte d'Azur, 2019. http://www.theses.fr/2019AZUR4063.
Full textWireless sensing has evolved since the discovery of radio wave echo detection and radar in 1886. Analyzing electromagnetic reflections from objects opened the way for a wide range of applications spanning from locating long-range targets for navigation and military to monitoring wind and precipitation for weather-forecasting to velocity detection for public safety. However, for the longest time, its usefulness was seldom for human-centric applications because of technical limitations, impracticality or costliness. Introducing wireless networks awakened a newfound interest in developing new wireless sensing services for their seamlessness and versatility. Integrating such functionalities would contribute to resolving some prominent societal issues. Localization, motion detection, and vital signs monitoring have great potential for promoting healthy aging, public safety, and retail. Contactless sensing offers an appreciable degree of freedom, enabling remote monitoring of the isolated elderly without hampering their daily lives. It could assist public safety services for crowd counting and detection of survivors inside buildings during emergencies. Retail and public facilities would benefit from passive and active localization to offer an enhanced experience to their visitors and to help their logistical efforts. This thesis addresses the problem of leveraging commercial off-the-shelf wireless networks for sensing applications: One challenge for wireless monitoring is to detect the attitude of a person accurately. While other works provide coarse-grained solutions for resolving such issues, we use MIMO radar techniques to provide an accurate orientation estimation system for Wi-Fi infrastructures. To be more precise, we analyze the phase information of signals received on the antenna array to compute the heading of a Wi-Fi terminal. A second challenge is to provide an accurate positioning system for LPWAN systems to maintain the information consistency of deployed sensors. Current solutions are complex, costly, or not energy-efficient. To address this problem, we introduce MIMO capabilities to LoRa LPWAN systems that provide accurate localization with limited startup costs. We enable the angle of arrival estimation by leveraging a second antenna on the LoRaWAN gateway. We also prove the usefulness of such information for wireless communication efficiency. A third challenge for wireless localization is the inefficiency of current model-based approaches in case of non-line-of-sight conditions and the rigidity of data-driven approaches in case of propagation environment changes. To address this challenge, we propose a new data-driven solution for passive localization to address the limitations of model-based localization techniques. To give life to such systems and provide them with a chance of impacting our everyday lives, we should promote reusability and reproducibility. For that, we focus on the challenge of reproducibility in wireless networking by surveying the current state, performing a case study, and presenting the engendered lessons
Maudet, Sébastien. "Analyse et modélisation énergétiques des réseaux de communications pour l’IoT." Electronic Thesis or Diss., Nantes Université, 2024. http://www.theses.fr/2024NANU4002.
Full textIoT is an innovative concept that enables objects to exchange data over communications networks. These objects are typically deployed with limited energy resources, and IoT communication protocols must take these constraints into account. In this thesis, we analyzed and modeled the energy consumption of two of the most prominent IoT communication protocols. First, we focused on Wi-Fi HaLow. After a descriptive presentation of this protocol and its mechanisms, performance was studied and characterized. Measurement campaigns showed that it performs well in terms of range, throughput and latency. Analysis of the protocol and measurements of the energy consumed on hardware have enabled us to establish an initial consumption model. This takes into account the exchanges required to establish a communication. The model was then refined to obtain a model based on an absorbing Markov chain that takes into account the environment and network density. This study validates the use of this technology in various IoT domains.We then turned our attention to the LoRaWAN protocol. Measurements of the energy consumed on hardware enabled us to propose a new energy consumption model that takes into account the node’s environment (retransmissions, errors and collisions). Finally, a comparison of the metrics and energy consumption of these two protocols was carried out, in order to open a discussion on the prospects for use cases
Lethien, Christophe. "Étude et réalisation d'un transducteur et d'un système de transmission fibre multimode - radio à 850nm pour applications GSM, UMTS et WIFI." Lille 1, 2004. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/893b3cd1-ae6a-4f03-95cf-442695977ddc.
Full text