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Littérature scientifique sur le sujet « Bande WiFi »

Auteur : Grafiati

Publié le 12 avril 2025

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Articles de revues sur le sujet "Bande WiFi"

Picheta, L., et V. Hoël. « Conception, réalisation et caractérisation d’un transposeur abaisseur de fréquence en bande X ». J3eA 23 (2024) : 1015. http://dx.doi.org/10.1051/j3ea/20241015.

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Ces travaux de projet technique ont été menés à l’Université de Lille, sur les plateformes de CAO et de caractérisation du PLFM (Pôle Lillois pour la Formation en Microélectronique et en nanotechnologies), par des étudiants en 2ème année du master Réseaux & Télécommunications parcours Systèmes électroniques communicants (https://master-electronique.univ-lille.fr/master-reseaux-et-telecommunication). Ce parcours de formation ouvert à l’alternance forme les étudiants aux fonctions d’ingénieur expert dans la conception et la caractérisation électronique haute fréquence (Radio et hyperfréquences) utilisée dans tous les systèmes actuels de communication : objets connectés IoT, bluetooth, WIFI, téléphonie cellulaire (4G,5G), identification sans contact (étiquette RF, RFID, NFC). Les compétences fournies permettent à nos diplômés de répondre aux développements de ces applications et de s’adapter aux futures technologies dans un domaine en constante mutation et un marché en pleine expansion.

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Cho, In-Kyoung, Tae-Youn Kim, Jae-Woong Jang, Kyung-Duk Jang et Guee-Won Moon. « Analysis on Compatibility between wireless headset and WiFi in ISM bands ». Journal of the Korea Institute of Information and Communication Engineering 19, n^o 2 (28 février 2015) : 272–78. http://dx.doi.org/10.6109/jkiice.2015.19.2.272.

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Paul, Liton Chandra, Sarker Saleh Ahmed Ankan, Tithi Rani, Md Tanvir Rahman Jim, Muharrem Karaaslan, Sk A. Shezan et Lulu Wang. « Design and Characterization of a Compact Four-Element Microstrip Array Antenna for WiFi-5/6 Routers ». International Journal of RF and Microwave Computer-Aided Engineering 2023 (17 août 2023) : 1–13. http://dx.doi.org/10.1155/2023/6640730.

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The WiFi-5 band was the most popular WiFi band until the Federal Communications Commission (FCC) announced a new spectrum of 6 GHz WiFi (5.925–7.125 GHz) for unlicensed users. Our proposed work is about to cover both the 5 GHz and 6 GHz WiFi bands. These two bands have a great impact in the wireless communication field. A low-loss Rogers RT 5880 material is used as the substrate layer, which helps us to make the antenna compact ( 23 × 40 × 0.79 mm3) keeping a good performance profile over the latest high-speed WiFi-5/6 band. The proposed antenna covers a huge bandwidth (simulated BW: 2.85 GHz ranging from 4.50 to 7.35 GHz and measured BW: 2.83 GHz ranging from 4.50 to 7.33 GHz), which can be used for the latest WiFi-5 and WiFi-6 routers. The antenna also has omnidirectional properties. Besides that, the gain and directivity of the antenna are quite good, and the measured results buttress the simulated results. The presented different detail parametric studies indicate the antenna’s optimization level, which is excellent. The minimum values of reflection coefficient and voltage standing wave ratio make it a compatible candidate for the implementation of high-speed WiFi-5/6 routers.

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Tang, Chunju, et Yanping Liu. « Machine Learning Approaches for Sharing Unlicensed Millimeter-Wave Bands in Heterogeneously Integrated Sensing and Communication Networks ». Electronics 12, n^o 20 (10 octobre 2023) : 4193. http://dx.doi.org/10.3390/electronics12204193.

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Due to the increasing demand of high data rate, spectrum scarcity is a key problem for providing unprecedented capacity in diversified applications for future wireless networks. Therefore, the efficiently shared use of unlicensed bands is one of the promising solutions for addressing the spectrum scarcity issue. We study decentralized machine learning approaches using the paradigm of integrated sensing and communication (ISAC) for the shared use of unlicensed millimeter-wave bands. We first present a 5G–WiFi fusion protocol stack for sharing unlicensed millimeter-wave bands, and then design an ISAC-based access protocol and an ISAC based coexistence protocol integrated with decentralized learning function to achieve the efficiently shared use of unlicensed bands. Using the coexistence protocol, we propose promising decentralized machine learning approaches to share unlicensed millimeter-wave bands. Finally, simulations are provided to verify the performance of the proposed scheme, where the results have shown that the proposed scheme greatly reduces the search space of the solution and effectively protects the communication performance of the WiFi system compared to traditional schemes, which indicates that simultaneous transmissions of 5G-U and WiFi at the 60 GHz band are feasible under the proposed scheme.

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Milosevic, Nenad, Bojan Dimitrijevic, Dejan Drajic, Zorica Nikolic et Milorad Tosic. « LTE and WiFi co-existence in 5 GHz unlicensed band ». Facta universitatis - series : Electronics and Energetics 30, n^o 3 (2017) : 363–73. http://dx.doi.org/10.2298/fuee1703363m.

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Since the future mobile networks will require significantly higher data throughput, and the Long-Term Evolution (LTE) licensed bands are already occupied, the frequency band extension and the data rate increase may be achieved by using some of the available unlicensed bands. The most appropriate unlicensed band for this purpose lies in 5 GHz frequency range. However, this unlicensed band is already occupied by WiFi networks and a special attention has to be paid to coordinate these two different networks in the shared spectrum usage. Therefore, this paper considers the shared access co-existence in 5 GHz unlicensed band between uncoordinated LTE and WiFi networks. More precisely, it considers the influence of the LTE downlink transmission on the performance of the WiFi networks. The experimental results show that the LTE significantly degrades the WiFi network performance, which means that some of the coordination algorithms have to be employed.

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Hemsy, Axel, Juan Eduardo Ise, Fernando Alberto Miranda Bonomi, Miguel Ángel Cabrera et Mariano Fagre. « Miniaturización con metamaterial de una antena PIFA de triple banda para comunicación Wi-Fi ». Elektron 8, n^o 2 (15 décembre 2024) : 77–81. https://doi.org/10.37537/rev.elektron.8.2.192.2024.

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En este trabajo se diseñó y modeló una antena F invertida plana (PIFA) de triple banda en las frecuencias de WiFi no licenciadas (2.4, 5 y 6 GHz). En la propuesta realizada se utilizó una celda unitaria de metamaterial que se replicó en el plano de tierra obteniendo una reducción en el tamaño de la antena con respecto a otras ya publicadas. La geometría de la celda se basa en la de un fractal de Minkowski. En el parche se realizó una ranura en forma de J que permitió ajustar las frecuencias de resonancias a las de WiFi. Se obtuvo una eficiencia de radiación del orden del 23% para la banda de 2.4 GHz, superior al 74% en la banda de 5 GHz y del 96% en la banda de 6 GHz.

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Adame, Toni, Marc Carrascosa-Zamacois et Boris Bellalta. « Time-Sensitive Networking in IEEE 802.11be : On the Way to Low-Latency WiFi 7 ». Sensors 21, n^o 15 (21 juillet 2021) : 4954. http://dx.doi.org/10.3390/s21154954.

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A short time after the official launch of WiFi 6, IEEE 802.11 working groups along with the WiFi Alliance are already designing its successor in the wireless local area network (WLAN) ecosystem: WiFi 7. With the IEEE 802.11be amendment as one of its main constituent parts, future WiFi 7 aims to include time-sensitive networking (TSN) capabilities to support low latency and ultra-reliability in license-exempt spectrum bands, enabling many new Internet of Things scenarios. This article first introduces the key features of IEEE 802.11be, which are then used as the basis to discuss how TSN functionalities could be implemented in WiFi 7. Finally, the benefits and requirements of the most representative Internet of Things low-latency use cases for WiFi 7 are reviewed: multimedia, healthcare, industrial, and transport.

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Chang, Ray-I., Ying-Chen Chen, Chi-Cheng Chuang et Chia-Hui Wang. « Design and Implementation of an IoT Gateway for Zigbee and WiFi ». WSEAS TRANSACTIONS ON COMMUNICATIONS 21 (2 juillet 2022) : 225–29. http://dx.doi.org/10.37394/23204.2022.21.27.

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This paper proposed a framework called IAPA (Integrated Access Point Architecture) that applied an off-the-shelf AP (Access Point) device on WLAN (Wireless Local Area Network) as an IoT (Internet-of-Things) gateway to integrate Zigbee and Wifi. This Wifi-Zigbee AP (called WiZAP) has the advantages of low cost, small size and low power consumption. However, the coexistence of Wifi and Zigbee in unlicensed bands will introduce a serious data collision problem. In this paper, we propose a linear-time balance-first configuration strategy to adjust Wifi parameters to reduce data collision. A strategy to dynamically configure these parameters for MAC layer communication is also proposed. Experiments test the influence of network transmission in real application scenarios. Results show that our WiZAP can work efficiently with the coexistence of Wifi and Zigbee.

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Pusuluri, Vinod Babu, A. M. Prasad et Naresh K. Darimireddy. « Optimization of 5G Sub Band Antenna Design Using Machine Learning Techniques for WiFi & ; WiMAX Application ». Indian Journal Of Science And Technology 18, n^o 2 (15 janvier 2025) : 160–67. https://doi.org/10.17485/ijst/v18i2.3681.

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Objectives: This article presents the design of a 5G-n78 sub-band frequency antenna for WiMAX and WLAN applications, along with its design optimization using four supervised machine learning models: Polynomial Regression (PR), Decision Tree (DT), Random Forest (RF), and Extreme Gradient Boosting (XGBoost). The performance of the machine learning models is evaluated using the Root Mean Square Error (RMSE) metric for both the test and train datasets. Furthermore, the dimensions obtained from the most efficient model, XGBoost, are utilized for fabrication and verification purposes. Method: The proposed patch antenna, designed on an FR-4 substrate with a relative dielectric constant of 4.4, a thickness of 1.6 mm, and a loss tangent of 0.002, is modeled in the High-Frequency Structural Simulator (HFSS) at a frequency of 3.3 GHz. The design dimensions are analyzed over a wide range to generate the dataset required for machine learning implementation to optimize the dimensions. Polynomial regression models of orders 2 and 7 are verified, with better accuracy in terms of RMSE obtained from all four ML models. Findings: The proposed metal patch antenna, with dimensions of (0.304λ0×0.238λ0) mm², resonates at 3.3 GHz, achieving a return loss (S11) of -37.4 dB, a standing wave ratio (SWR) of 1.03, and a gain of 4.06 dBi. A dataset of 2000 records was generated using a full-wave electromagnetic simulator for training and testing purposes across all four ML models. The Root Mean Square Error (RMSE) values obtained for training and testing were 4.42 and 4.44 for the Decision Tree model, 2.04 and 3.17 for the seventh-order Polynomial Regression model, 0.81 and 2.20 for the Random Forest model, and 0.72 and 1.14 for the XGBoost model. The dimensions obtained from the XGBoost model (18 mm in length and 28.5 mm in width) were used for fabrication. The proposed, ML-based simulated, and fabricated return loss values were verified, further, the computational time required for ML simulation is 0.0578s against 9.05m in HFSS simulator. Novelty: Present work reveals the introduction of ML techniques in conventional electromagnetic solvers for better optimization in less time with more efficiency and reachable to antenna engineers. Keywords: High Frequency Structural Simulator, Machine Learning Algorithm, Microstrip Patch Antenna, Return loss, Root Mean square error

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Mushunuri, Visali, Bighnaraj Panigrahi, Hemant Kumar Rath et Anantha Simha. « Efficient listen before technique for LTE-WiFi co-existence in unlicensed bands ». International Journal of Space-Based and Situated Computing 7, n^o 2 (2017) : 108. http://dx.doi.org/10.1504/ijssc.2017.086825.

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Thèses sur le sujet "Bande WiFi"

Zaraket, Elie. « Réalisation d’une 'méta-peau' récupératrice d’énergie électromagnétique pour des applications WBAN ». Electronic Thesis or Diss., Bordeaux, 2025. http://www.theses.fr/2025BORD0035.

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Les progrès récents dans le domaine des technologies biomédicales et de la santé connectée ont considérablement accéléré le développement de dispositifs flexibles et portables pour une surveillance continue de la santé. Le marché de l'Internet des Objets Médicaux (IoMT) devrait connaître une croissance rapide avec un taux annuel de 38.5% entre 2024 et 2032, largement porté par les Réseaux de Capteurs Corporels Sans Fil (WBAN). Cependant, la conception de dispositifs IoT portables, miniaturisés et biocompatibles, capables de fonctionner de manière autonome, reste un défi majeur, en particulier pour les capteurs physiologiques. Cette thèse propose le développement d’un système portable de récupération d'énergie sous la forme d’un dispositif appliqué sur la peau, destiné à la surveillance de l'état physiologique. L’un des principaux défis de ce travail réside dans l’impact du corps humain sur les performances des antennes, qui sont directement influencées lorsqu’elles sont positionnées sur la peau. Les Conducteurs Magnétiques Artificiels (AMC) apparaissent comme une solution prometteuse en tant que réflecteurs pour des antennes à faible profil fonctionnant dans les bandes GSM et WiFi. Grâce à leurs propriétés de réflexion à phase nulle, les AMCs permettent d’améliorer les performances des antennes tout en éliminant la nécessité d’un plan de masse volumineux de type quart d’onde. Les tests expérimentaux réalisés sur une antenne à double bande équipée d’un AMC ont démontré une distorsion minimale des performances pour les applications WBAN. Enfin, l’intégration d’un convertisseur RF-DC permet à la rectenna de fonctionner comme un collecteur d’énergie portable et autonome, tout en fournissant une tension redressée de 1V à environ -17.5 dBm, ce qui est suffisant pour alimenter certains capteurs physiologiques
Recent advancements in remote healthcare and biomedical technologies are rapidly accelerating the development of flexible, wearable devices for continuous health monitoring. The Internet of Medical Things (IoMT) market is projected to grow at a Compound Annual Growth Rate (CAGR) of 38.5% between 2024 and 2032, with Wireless Body Area Networks (WBAN) serving as a critical driver of this growth. Thus far, the expansion of IoT devices has faced challenges in designing wearable, miniaturized, and biocompatible prototypes with power-autonomous operation for physiological sensors. Therefore, this thesis aims to develop a wearable Energy-Harvesting (EH) system, in the form of a skin-applied device, designed for monitoring physiological conditions. The primary challenge of this research is the impact of the human body on the antenna system's performance when positioned directly on the skin. The body absorbs part of the radiation, which significantly reduces the efficiency of the EH system. In this context, Artificial Magnetic Conductors (AMC)s present a promising solution as reflectors for low-profile antennas, in the GSM and WiFi bands. By leveraging their inherent zero-phase reflection properties, AMCs improve antenna performance while eliminating the need for a bulky quarter-wave backplane. The real-world tests of the dual-band AMC-backed antenna showed minimal performance distortion for WBAN applications. Finally, the integration of a designed RF-to-DC converter enables the rectenna to function as an autonomous wearable energy harvester, providing a rectified voltage of 1V at approximately -17.5 dBm, suitable for powering certain physiological sensors

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Šrajbr, Michal. « Šroubovicová dvoupásmová anténa pro WiFi pásmo ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219857.

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This master’s thesis is focused on the properties and types of helical antennas. The helical antenna work in the different modes. These modes are described in this thesis. There are also discussed possibility for design a dual-band helical antennas. The main aim of this work is the selection of a suitable solution and design a dual-band helical antenna for the WiFi band working at resonance frequencies of 2,4 GHz and 5 GHz. The simulation of this antenna was performed in the program CST Microwave studio.

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Hamouda, Hafedh. « Conception d'antennes miniatures intégrées à leur support pour applications en télémédecine mobile ». Thesis, Nice, 2014. http://www.theses.fr/2014NICE4062.

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La télémédecine et plus particulièrement la télémédecine mobile semble représenter l’avenir en termes de soins médicaux. Ce concept nécessite cependant pour sa viabilité, de disposer d’éléments rayonnants miniatures, fortement efficaces, et capables de communiquer sur plusieurs bandes. Ce mémoire présente la méthodologie de conception et l’optimisation d’antennes miniatures intégrées, dédiées à un dispositif spécifique permettant de réaliser une liaison radiofréquence entre un implant médical et le téléphone portable d’un patient. Cependant, la miniaturisation des antennes, éléments clés de ce concept, s’accompagne généralement d’une dégradation de son efficacité et de sa bande passante, ce qui rend délicat leur mise en œuvre sur au moins deux des points essentiels recherchés. La conception de ce type d'antennes nécessite donc une analyse très fine des phénomènes physiques mis en jeu dont notamment la limite théorique en termes de performances que l'on peut atteindre pour une antenne circonscrite à un volume donné. De plus, ces performances radioélectriques sont fortement dépendantes de l'environnement dans lequel est placée l’antenne. Par conséquent, l'influence de chaque partie constituant cet environnement doit être prise en compte lors de l'intégration, ce que nous décrivons également dans ce manuscrit à travers différentes solutions d’éléments rayonnants
This thesis presents the design and the optimization of miniature antennas integrated in specific devices dedicated to ensure communications between medical implants and a mobile phone in the context of telemedicine applications. However, the miniaturization of antennas necessarily implies a degradation of efficiency and bandwidth, which makes it difficult for implementation. Then, the design of electrically small antennas requires a very good understanding of the physical phenomena such as the theoretical limits of performance in terms of bandwidth and efficiency that can be expected for a radiating element with given dimensions. Furthermore, the performance of an electrically small antenna is also highly dependent on the environment in which it is mounted. Therefore, its interaction with each part of its close environment was highlighted and analyzed

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Vallet, Mathieu. « Synthèse de fréquence multi-bandes couvrant les ondes millimétriques pour les applications WiFi-WiGig ». Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0407/document.

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L’ensemble des travaux présentés au sein de manuscrit porte sur la réalisation d’un synthétiseur de fréquences millimétriques capable de répondre aux besoins de la convergence WiFi-WiGig. Une première étude est réalisée dans le but de définir une architecture de synthétiseur de fréquence faible consommation adaptée aux standards du WiFi et du WiGig. L’ensemble des éléments composants la PLL sont par la suite détaillés, mettant en avant les avantages offerts par la technologie 28 nm FDSOI CMOS. Une étude plus approfondie des VCO millimétriques large bande et faible consommation est ensuite présentée, permettant de mettre en avant une réelle méthodologie de conception en lien avec la technologie 28 nm FDSOI CMOS. Finale-ment, diverses solutions sont proposées dans le but d’améliorer les performances de la PLL, avec l’incorporation de VCO millimétriques à ondes lentes, ou d’oscillateurs à anneaux synchronisés
The works presented in this manuscript focus on the realization of a millimeter frequency synthesizer meeting the needs of the WiGig-Fi convergence. A first study was conducted to define a suitable low-power frequency synthesizer archi-tecture for WiFi and WiGig standards. All of the PLL components are subsequently detailed, highlighting the 28nm CMOS FDSOI technology benefits. Then, a study of low power millimeter broadband VCO is presented, highlighting a design methodology related to the 28nm CMOS FDSOI technology. Finally, various solutions are proposed in order to improve the PLL performances, with the incorporation of slow wave VCO, or injection locked ring oscillators

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Malvaceda, Rojas Daysy. « Diseño de una red inalámbrica de banda ancha para el mejoramiento de la red wifi del Napo ». Bachelor's thesis, Pontificia Universidad Católica del Perú, 2014. http://tesis.pucp.edu.pe/repositorio/handle/123456789/5374.

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En el presente proyecto de tesis se desarrolló el diseño para el mejoramiento de la Red WiFi de larga distancia del Napo, que fue implementada por el Grupo de Telecomunicaciones Rurales de la PUCP. Para lo cual, se evaluó el estado actual de la red y las limitaciones que esta presenta y de acuerdo a ello, se plantearon los requerimientos técnicos de la red, los cuales permitieron establecer los parámetros de diseño para la nueva red. Los problemas sobre la calidad de los servicios que brinda la red se presentan principalmente en los enlaces de backhaul, dado que no existe suficiente capacidad y por la ausencia de políticas de calidad de servicio. En esta tesis se desarrolló un nuevo diseño de los enlaces de backhaul de la Red del Napo; por lo cual, se evaluaron las distintas tecnologías recientes de banda ancha, asimismo los equipos disponibles en el mercado. Se eligió el equipo WiMAX Modelo LNK-LU150-N de la marca Albentia como la mejor opción; dicho equipo cumplió con los requerimientos técnicos planteados. Los enlaces del backhaul trabajarán en la frecuencia libre de 5.8 GHz con un ancho de banda de canal de 10MHz, y se utilizarán sistemas fotovoltaicos en las zonas donde no se dispone de energía eléctrica comercial para poder energizar los equipos. Asimismo, en esta tesis, se plantea un estudio de las diferentes políticas de calidad de servicio con la finalidad de cumplir los requisitos establecidos preliminarmente. Esto dio como resultado la selección de tipo de calidad de servicio Unsolicited Grant Service (UGS) para voz, Real-time Polling Service (rtPS) para vídeo y Best Effort (BE) para datos. Luego, se presentó la propuesta económica de la implementación de la nueva red. El resultado principal del presente trabajo es una propuesta de ampliación de la capacidad de la red y el establecimiento de políticas de calidad de servicio en el backhaul, lo cual permitiría mejorar los servicios de voz, datos y vídeo que utiliza los centros de salud que son interconectados por la Red del Napo.
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Žiška, Jiří. « Srovnání použití bezdrátových sítí 802.11 a/b/g/n a E-band v praxi ». Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2010. http://www.nusl.cz/ntk/nusl-237198.

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This master's thesis compares wireless technologies which they are used at current time. The most of information in this thesis are obtained from my practical experiences with design and realization of wireless network during last four years. The thesis briefly describes standards and security of WiFi. More time is devoted to the description of new standard 802.11n and the E-Band. The use of E-Band is allowed in Czech Republic from a year 2008. The thesis describes a practical evaluation of wireless network 802.11a/b/g/n and E-Band. Examples of the use are described in case studies of high-speed point-to-point wireless bridge, coverage of a logistic warehouse and wireless network with location in a hospital.

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Saldanha, Carlos Alberto. « Analisando a viabilidade da aplica??o triple play para a inclus?o digital, utilizando a tecnologia Wimax ». Pontif?cia Universidade Cat?lica de Campinas, 2007. http://tede.bibliotecadigital.puc-campinas.edu.br:8080/jspui/handle/tede/486.

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Made available in DSpace on 2016-04-04T18:31:19Z (GMT). No. of bitstreams: 1 CARLOS SALDANHA.pdf: 2117803 bytes, checksum: 2021a031c03613d9b6c2df0e8e8aba68 (MD5) Previous issue date: 2007-06-28
Digital Inclusion is currently a concerning subject especially in those urgent countries. In Brazil there have been various initiatives and experiences regarding this subject, both from government parts (Federal, State and Urban) and through Non-Profitable Organizations and private companies. The approach to low-cost Broadband Internet has been one of the main barriers to the effectiveness on these initiatives. The goal of this current work is to find new concepts and connection management and voice services, data and video (triple play) in a unique wireless connection focusing on digital inclusion. The used wireless technology is the World Interoperability for Microwave Access (WiMAX), whose frequency is of 5,8 GHZ, which permission is not required for its usage along with National Telecommunication Agency (ANATEL) and to the access point, the wireless fidelity technology (Wifi). Some main convergent WiMAX technology characteristics are described in this work with new Triple Play services to hold a multipoint-point enlacement, causing an establishment to link a case study between the School and PUC-Campinas in order to investigate the performance and application factors. The results on the efficiency of metropolitan wireless network (WMAN) as well as the Triple Play services were profitable, defining a new method on prediction of coverage area and user s quantity.
Inclus?o Digital ? hoje um tema de muita preocupa??o, principalmente nos pa?ses denominados emergentes. No Brasil existem diversas iniciativas e experi?ncias relativas a esse assunto, tanto por parte dos governos (Federal, Estadual e Municipal), como tamb?m por parte de ONG s e empresas privadas. O acesso ? Internet Banda Larga a baixo custo tem sido uma das principais barreiras para a efetiva??o dessas iniciativas. O prop?sito do presente trabalho ? definir novos conceitos e par?metros de conex?o e servi?os de voz, dados e v?deo (triple play) em uma ?nica conex?o sem fio com foco na inclus?o digital. A tecnologia de conex?o sem fio (wireless) utilizada ? o World Interoperability for Microwave Acess (WiMAX), de freq??ncia 5.8 GHz, que n?o requer licenciamento para a sua utiliza??o junto a Ag?ncia Nacional de Telecomunica??es (ANATEL) e para o ponto de acesso, a tecnologia wireless fidelity (WiFi). Neste trabalho est?o descritas as principais caracter?sticas da tecnologia WiMAX convergentes, com os novos servi?os Triple Play para a realiza??o de um enlace ponto-multiponto, estabelecendo-se um link para estudo de caso entre a Escola e a PUC-Campinas, para a investiga??o dos fatores de desempenho e aplica??es. Os resultados de efici?ncia da rede sem fio metropolitana (WMAN) com os servi?os Triple Play foram satisfat?rios, definindo-se um novo m?todo de predi??o da ?rea de cobertura e do n?mero de usu?rios.

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Junior, Dagoberto Carvalio. « Uma plataforma para avaliar a degradação da vazão causada por interferência espectral em redes sem fio padrão IEEE 802.11 ». Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-30032011-091330/.

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A interferência espectral gera patologias nos sistemas de comunicação sem fio (wireless), como por exemplo, quedas na comunicação e degradação na vazão. O espectro de RF (rádio frequência) é fiscalizado e controlado por órgãos governamentais, no entanto as redes sem fio padrão IEEE 802.11, conhecidas por WLANs (Wireless Local Area Networks), trabalham em faixas espectrais não licenciadas, conhecidas por ISM. Estas redes estão cada vez mais presentes nos ambientes comerciais e residenciais, contribuindo para questões de ubiquidade e acesso à Internet. Com este aumento expressivo, a cobertura espectral está cada vez mais densa. A densidade elevada de sinais aponta para a saturação do espectro ISM, causando interferências mútuas das redes IEEE 802.11. O objetivo deste trabalho é analisar a cobertura do espectro, por redes WLANs, e avaliar quedas de vazão ocasionadas por interferências espectrais, variando no espaço e no tempo. Dois cenários foram mapeados para analisar as degradações, um com baixa a média e outro com alta densidade e complexidade. O objetivo da criação desses cenários foi comparar as degradações causadas pelas interferências em ambientes diferentes, na ocupação, na utilização e na propagação de sinais de redes WLANs. Através dos resultados obtidos, um ciclo de vida de gerenciamento do espectro de redes padrão 802.11 foi proposto. Este ciclo contribui para avaliar e classificar o estado de uma rede em densa, não densa, complexa e não complexa, visto que alterações de ocupação do espectro no espaço e no tempo são plausíveis de ocorrerem. Conclui-se que os impactos da sobreposição total do canal, por fontes 802.11, não são suficientes para a substancial degradação da vazão em ambientes de baixa a média complexidade. Em ambientes com alta densidade e complexidade as degradações são mais evidentes, principalmente quando ocorrem perturbações vindas de duas fontes adjacentes
The spectral interference generates pathologies in wireless communication systems (wireless), such as declines in communication and degradation in flow. The spectrum of RF (radio frequency) is supervised and controlled by government agencies, however the wireless standard IEEE 802.11, known as WLANs (Wireless Local Area Networks), work in unlicensed spectrum bands, known as ISM. These networks are increasingly involved in commercial and residential environments, contributing to issues and ubiquity of Internet access. With the significant increase in these networks, the spectral coverage is increasingly dense. The high density of signals pointing to the saturation of the ISM spectrum, causing mutual interference of IEEE 802.11 networks. The aim of this study is to analyze the coverage of the spectrum, for WLANs, and evaluate the flow falls caused by spectral interferences, varying in space and time. Two scenarios were mapped to examine the degradations, with a low to medium and one with high density and complexity. The purpose of creating these scenarios was to compare the degradation caused by interference in different environments, occupation, use and spread of signals WLANs. Through the results, a life cycle management of the spectrum of standard 802.11 networks was proposed. This cycle helps to evaluate and classify the state of a dense network, not dense, complex and not complex, since changes in occupation of the spectrum - in space and time - are plausible to occur. It is concluded that the impacts of the complete overlap of the channel, sources 802.11, are not sufficient to the substantial degradation of the flow in low to medium complexity. In environments with high density and complexity of the degradation is more evident, especially when there are disturbances coming from two adjacent sources

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Choi, Junsung. « Feasibility Study and Performance Evaluation of Vehicle-to-Everything (V2X) Communications Applications ». Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/97248.

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Vehicular communications are a major subject of research and policy activity in industry, government, and academia. Dedicated Short-Range Communications (DSRC) is currently the main protocol used for vehicular communications, and it operates in the 5.9 GHz band. In addition to DSRC radios, other potential uses of this band include Wi-Fi, LTE-V, and communication among unlicensed devices. This dissertation presents an architecture and a feasibility analysis including field measurements and analysis for vehicle-to-train (V2T) communications, a safety-critical vehicular communication application. The dissertation also presents a survey of research relevant to each of several possible combinations of radio-spectrum and vehicular-safety regulations that would affect use of the 5.9 GHz band, identifies the most challenging of the possible resulting technical challenges, and presents initial measurements to assess feasibility of sharing the band by DSRC radios and other devices that operate on adjacent frequencies using different wireless communication standards. Although wireless technology is available for safety-critical communications, few applications have been developed to improve railroad crossing safety. A V2T communication system for a safety warning application with DSRC radios can address the need to prevent collisions between trains and vehicles. The dissertation presents a V2T early warning application architecture with a safety notification time and distance. We conducted channel measurements at a 5.86�"5.91-GHz frequency and 5.9-GHz DSRC performance measurements at railroad crossings in open spaces, shadowed environments, and rural and suburban environments related to the presented V2T architecture. Our measurements and analyses show that the DSRC protocol can be adapted to serve the purpose of a V2T safety warning system. The 5.9 GHz band has been sought after by several stakeholders, including traditional mobile operators, DSRC proponents, unlicensed Wi-Fi proponents and Cellular-Vehicle-to-Everything (C-V2X) proponents. The FCC and National Highway Traffic Safety Administration (NHTSA), the two major organizations that are responsible for regulations related to vehicular communications, have not finalized rules regarding this band. The relative merits of the above mentioned wireless communication standards and coexistence issues between these standards are complex. There has been considerable research devoted to understanding the performance of these standards, but in some instances there are gaps in needed research. We have analyzed regulation scenarios that FCC and NHTSA are likely to consider and have identified the technical challenges associated with these potential regulatory scenarios. The technical challenges are presented and for each a survey of relevant technical literature is presented. In our opinion for the most challenging technical requirements that could be mandated by new regulations are interoperability between DSRC and C-V2X and the ability to detect either adjacent channel or co-channel coexisting interference. We conducted initial measurements to evaluate the feasibility of adjacent channel coexistence between DSRC, Wi-Fi, and C-V2X, which is one of the possible regulatory scenarios. We set DSRC at Channel 172, Wi-Fi at Channel 169 for 20 MHz bandwidth and at Channel 167 for 40 MHz, and C-V2X at Channel 174 with almost 100% spectrum capacity. From the measurements, we observed almost no effects on DSRC performance due to adjacent channel interference. Based on our results, we concluded that adjacent channel coexistence between DSRC, C-V2X, and Wi-Fi is possible. DSRC systems can provide good communication range; however, the range is likely to be reduced in the presence of interference and / or Non-Line-of-Sight (NLoS) conditions. Such environmental factors are the major influence on DSRC performance. By knowing the relationship between DSRC and environmental factors, DSRC radios can be set up in a way that promotes good performance in an environment of interest. We chose propagation channel characteristics to generate DSRC performance modelling by using estimation methods. The conducted DSRC performance measurements and propagation channel characteristics are independent; however, they share the same distance parameters. Results of linear regression to analyze the relationship between DSRC performance and propagation channel characteristics indicate that additional V2T measurements are required to provide data for more precise modeling.
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Zhao, Jincheng. « Novel Reconfigurable Folded-Slot Antenna Application ». University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1589197436703822.

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Livres sur le sujet "Bande WiFi"

Warfield, Patrick. A Presidential Musician. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252037795.003.0005.

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This chapter examines the first part of John Philip Sousa's tenure as leader of the United States Marine Band and shows how he worked to stabilize that ensemble's membership and modernize its repertoire. The following day after Sousa and his wife arrive in Washington in 1880, he enlisted in the Marine Corps for the third time, now as the band's seventeenth director, its youngest leader, and its first American-born conductor. Given the nature of Sousa's later fame, his appointment to the Marine Band seems only natural. But at this stage of his career he had never led a band or military ensemble. He was a published composer, but very little of his music was for ensembles of winds alone, and marches were not yet an important part of his output. Despite this lack of experience, Sousa's new appointment was little more than a fine-tuning of his career.

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Riccardi, Ricky. Stomp Off, Let's Go. Oxford University PressNew York, 2025. https://doi.org/10.1093/oso/9780197614488.001.0001.

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Abstract Stomp Off, Let’s Go provides an overview of iconic trumpeter Louis Armstrong and his meteoric rise to fame. It examines Armstrong’s musical and personal development, including his initial trip to Chicago to join Joe “King” Oliver’s band, his first to New York to meet Fletcher Henderson, and his eventual return to Chicago. Moreover, Armstrong changed the course of music following his recordings with Hot Five and Hot Seven. Stomp Off, Let’s Go presents several snippets from the autobiography of Armstrong’s second wife, Lillian “Lil” Hardin Armstrong. The book, Stomp Off, Let’s Go explores Armstrong’s personal and professional relationships, while providing essential insights into how Armstrong evolved into one of America’s most beloved icons.

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Game Freaks 365's Wii Review Guide. Smashwords, 2010.

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Penfold, Rosalind B. Dragonslippers : This Is What an Abusive Relationship Looks Like. Grove/Atlantic, Incorporated, 2007.

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Penfold, Rosalind B. Dragonslippers : This Is What an Abusive Relationship Looks Like. Penguin Books Canada, 2005.

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Dragonslippers : This Is What an Abusive Relationship Looks Like. HarperCollins Publishers Limited, 2006.

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Dragonslippers : This is what an abusive relationship looks like. New York : Black Cat/Grove Press, 2006.

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Chapitres de livres sur le sujet "Bande WiFi"

Rojas, Javier, Nataly Valencia Pavón, David Atupaña et José Campos. « Greinacher Rectifier Evaluation for WiFi Band Energy Harvesting ». Dans Emerging Research in Intelligent Systems, 135–47. Cham : Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-52255-0_10.

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Czerwinski, Dariusz, Jaroslaw Nowak et Slawomir Przylucki. « Evaluation of the Jammers Performance in the WiFi Band ». Dans Computer Networks, 171–82. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-92459-5_14.

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Kim, Jongwoo, Suwon Park, Seung Hyong Rhee, Yong-Hoon Choi et HoYoung Hwang. « Energy Efficient Coexistence of WiFi and WiMAX Systems Sharing Frequency Band ». Dans Future Generation Information Technology, 164–70. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-17569-5_18.

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Zhu, Lei, Haijun Zhang et Xuebin Li. « Energy Efficient Resource Allocation in Small Cells with WiFi Unlicensed Bands Sharing ». Dans Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 141–51. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-17513-9_10.

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Mathivannan, S., S. Srinath, R. Shashank, R. Aravindh et Vidhya Balasubramanian. « A Dynamic Weighted Trilateration Algorithm for Indoor Localization Using Dual-Band WiFi ». Dans Web and Wireless Geographical Information Systems, 174–87. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-17246-6_14.

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Varshney, Atul, Vipul Sharma, T. Mary Neebha et N. Prasanthi Kumari. « A Tri-band Meander Line Fed Alpha-Numeric Antenna for Military Band, WiFi, and 5G Wireless Green Communications ». Dans 5G Green Communication Networks for Smart Cities, 167–86. New York : Apple Academic Press, 2024. https://doi.org/10.1201/9781003560357-9.

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Alcalá Garrido, Hassel Aurora, Víctor Barrera Figueroa et Mario Eduardo Rivero-Ángeles. « Design and Simulation of Antennas for Energy Harvesting Systems in the WiFi Band ». Dans Communications in Computer and Information Science, 45–55. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03763-5_5.

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Duong, Thi Thanh Tu, Minh Duc Hoang et Thi Thu Nga Nguyen. « Optimizing Penta-Band Vivaldi Antenna for 5G, WiFi 6, Radar and Satellite Applications ». Dans Intelligent Systems and Networks, 309–19. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3394-3_36.

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Khabba, Asma, Layla Wakrim, Saida Ibnyaich et Moha M’Rabet Hassani. « Multi-band Planar-Inverted-F-Antenna Design for WIFI WIMAX and WLAN Applications ». Dans Digital Technologies and Applications, 1013–20. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73882-2_92.

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Zhang, Quanqi, Shuhui Yan et Hongzhou Tan. « A Dual-Band Cross-Coupled Bandpass Filter with CPW Trapezoid Resonator for WIFI Frequencies ». Dans Wireless Communications, Networking and Applications, 439–47. New Delhi : Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2580-5_40.

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Actes de conférences sur le sujet "Bande WiFi"

Singh, Sweta, Arun Prakash, Rudra Caculo et Rajeev Tripathi. « Design of Dual Band WiFi PCB Antenna ». Dans 2024 Second International Conference on Microwave, Antenna and Communication (MAC), 1–6. IEEE, 2024. https://doi.org/10.1109/mac61551.2024.10837122.

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Iqbal, Sohail, Syed Tamoor Shah, Mazhair Hussain, Arooba Barakat, Inam Ullah, Ahsan Javed et Adnan Nadeem. « Compact Dual-Band Antenna for WiFi/WiMAX Applications ». Dans 2023 20th International Bhurban Conference on Applied Sciences and Technology (IBCAST), 404–6. IEEE, 2023. http://dx.doi.org/10.1109/ibcast59916.2023.10712824.

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Chung, Ming-An, Min-Yu Chen, Chia-Chun Hsu, Chih-Wei Yang, Chia-Wei Lin et Zhi-Xuan Zhang. « A 2 × 2 MIMO Antenna System for Wireless Handheld Devices Applicable to WiFi 2.4 GHz, WiFi 6E and Sub-6G Frequency Bands ». Dans 2024 IEEE International Workshop on Electromagnetics : Applications and Student Innovation Competition (iWEM), 1–2. IEEE, 2024. http://dx.doi.org/10.1109/iwem59914.2024.10649047.

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Ali, Ayyaz, Maryam Rasool, Falak Naz, Saleem Shahid et Syed Muzahir Abbas. « A Dual Band Pole Shaped Planar Antenna for WLAN and WiFi 5G Applications ». Dans 2024 IEEE International Symposium on Antennas and Propagation and INC/USNC‐URSI Radio Science Meeting (AP-S/INC-USNC-URSI), 2521–22. IEEE, 2024. http://dx.doi.org/10.1109/ap-s/inc-usnc-ursi52054.2024.10686474.

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Song, Jae-Hyeok, Jeong-Taek Lim, Jae-Eun Lee, Jeong-Taek Son, Joon-Hyung Kim, Min-Seok Baek, Byeong Chan Lee et al. « CMOS Power Amplifiers with Symmetrical IMD3 Performance for 802.11ac 5G-band WiFi Applications ». Dans 2024 Asia-Pacific Microwave Conference (APMC), 955–57. IEEE, 2024. https://doi.org/10.1109/apmc60911.2024.10867450.

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Noghanian, Sima. « Effects of Dust, Sweat, and Moisture on a Dual-Band Wearable WiFi Antenna ». Dans 2025 IEEE International Workshop on Antenna Technology (iWAT), 1–3. IEEE, 2025. https://doi.org/10.1109/iwat64079.2025.10931168.

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Li, Lei, Ruifeng Xu, Jingxu Cao et Xue Li. « A compact dual-band rectenna for WIFI bands ». Dans 2023 3rd International Conference on Intelligent Power and Systems (ICIPS). IEEE, 2023. http://dx.doi.org/10.1109/icips59254.2023.10405288.

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Song, Hyok J., James H. Schaffner, Timothy Talty, Duane Carper et Eray Yasan. « Dual-Band WiFi Applique Antenna ». Dans 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting. IEEE, 2019. http://dx.doi.org/10.1109/apusncursinrsm.2019.8888306.

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Rida, Amin, George Shaker, Farzad Nasri, Trevale Reynolds, Symeon Nikolaou et Manos Tenzeris. « Inkjet printing of dual band conformal antenna for use in wifi frequency bands ». Dans 2010 IEEE Radio and Wireless Symposium (RWS). IEEE, 2010. http://dx.doi.org/10.1109/rws.2010.5434212.

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Chae, Yoon, et Song Min Kim. « Safeguarded ZigBee via WiFi Guard Band ». Dans SenSys '18 : The 16th ACM Conference on Embedded Networked Sensor Systems. New York, NY, USA : ACM, 2018. http://dx.doi.org/10.1145/3274783.3275180.

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