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Letteratura scientifica selezionata sul tema "Bande GSM"

Autore: Grafiati

Pubblicato: 12 aprile 2025

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Articoli di riviste sul tema "Bande GSM"

ALEXANDRU, Marian, e Dorin NICULESCU. "COMPARATIVE STUDY OF SAR VALUES FOR THE GSM 900 AND GSM 1800 FREQUENCY BANDS". Review of the Air Force Academy 13, n. 3 (16 dicembre 2015): 117–22. http://dx.doi.org/10.19062/1842-9238.2015.13.3.20.

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Chang, The-Nan, e Yu-Chou Chuang. "Antenna covering GSM/PCN/bluetooth and GPS bands". Microwave and Optical Technology Letters 53, n. 1 (22 novembre 2010): 34–40. http://dx.doi.org/10.1002/mop.25664.

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Martínez Quintero, Juan Carlos, José de Jesús Rugeles Uribe e Edith Paola Estupiñán Cuesta. "Análisis de ocupación espectral banda GSM 850 en Bogotá". Visión electrónica 12, n. 1 (29 giugno 2018): 5–13. http://dx.doi.org/10.14483/22484728.14801.

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Este artículo presenta un análisis de uso de canales y la medición de ocupación espectral sobre la banda GSM-850 para el enlace downlink mediante dos escenarios de medición; Se definió un sector de Bogotá, Zona norte, sobre el cual se trazó una trayectoria de sensado; identificando parámetros como BSIC, NCC, LAI, MNC, LAC, CI, canal BCCH, frecuencia Uplink, nivel de potencia entre otros; a través del equipo Qualipoc. Se evidenció una cobertura con 17 celdas a lo largo del recorrido de 2.96 Km, con reconexión en dos de las celdas identificadas, resaltando la modulación GMSK como predominante y niveles de potencia aceptables para las estaciones móviles según la norma 3GPP GSM05.05. Posteriormente se realizó la captura del espectrograma en esta misma banda identificando la convivencia de diferentes tecnologías de telefonía móvil y el uso de GSM en varios canales de frecuencias y espacios temporales, con ocupación espectral del 95.2%

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Bakır, Mehmet, Muharrem Karaaslan, Olcay Altıntaş, Mehmet Bagmancı, Volkan Akdogan e Feyzullah Temurtaş. "Tunable energy harvesting on UHF bands especially for GSM frequencies". International Journal of Microwave and Wireless Technologies 10, n. 1 (10 dicembre 2017): 67–76. http://dx.doi.org/10.1017/s1759078717001325.

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Metamaterial-based energy harvesting structures operating at GSM 900 and GSM 1800 frequency bands have been proposed. The basic structure is composed of four nested U-shaped elements on the front and back side of the dielectric substrate, with a 180° relationship between the front and back resonators. As energy harvesting capability is directly related to the quality of absorption, with the aim being perfect absorption, there is an air gap to allow tuning of the resonance frequency, and copper plate follows the air gap to facilitate the perfect absorption of electromagnetic waves, which is verified by means of simulation and experimental tests. A set of simulations and experimental study were further carried out to demonstrate incident and polarization angle dependency, the effects of Schottky diodes, and the optimal orientation of the U-shapes. Spectrum analysis and DC voltage measurements across the HSMS 2860 Schottky diode are also presented to test the energy harvesting capability: the spectrum analyzer shows a 40 dBm difference, while 81.7 mV maximum DC voltage is observed at 900 MHz. The simulation and experimental study results, while displaying several differences, do suggest that the proposed design can be used for running low-energy consumption devices such as sensors and switches.

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Owiredu, Solomon Amoah, Shem Otoi Onyango, Eun-A. Song, Kwang-Il Kim, Byung-Yeob Kim e Kyoung-Hoon Lee. "Enhancing Chub Mackerel Catch Per Unit Effort (CPUE) Standardization through High-Resolution Analysis of Korean Large Purse Seine Catch and Effort Using AIS Data". Sustainability 16, n. 3 (4 febbraio 2024): 1307. http://dx.doi.org/10.3390/su16031307.

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Accurate determination of fishing effort from Automatic Identification System (AIS) data improves catch per unit effort (CPUE) estimation and precise spatial management. By combining AIS data with catch information, a weighted distribution method is applied to allocate catches across various fishing trajectories, accounting for temporal dynamics. A Generalized Linear Model (GLM) and Generalized Additive Model (GAM) were used to examine the influence of spatial–temporal and environmental variables (year, month, Sea Surface Temperature (SST), Sea Surface Salinity (SSS), current velocity, depth, longitude, and latitude) and assess the quality of model fit for these effects on chub mackerel CPUE. Month, SST, and year exhibited the strongest relationship with CPUE in the GLM model, while the GAM model emphasizes the importance of month and year. CPUE peaked within specific temperature and salinity ranges and increased with longitude and specific latitudinal bands. Month emerged as the most influential variable, explaining 38% of the CPUE variance, emphasizing the impact of regulatory measures on fishery performance. The GAM model performed better, explaining 69.9% of the nominal CPUE variance. The time series of nominal and standardized indices indicated strong seasonal cycles, and the application of fine-scale fishing effort improved nominal and standardized CPUE estimates and model performance.

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Zapata Ochoa, Edison Andres, Francisco López e Germán Góez. "Antenas monopolo de doble banda para captación de energía de radiofrecuencia del medio ambiente". MASKAY 12, n. 1 (10 novembre 2021): 10. http://dx.doi.org/10.24133/maskay.v12i1.2283.

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Este artículo presenta dos rectennas (Rectifying Antennas) de bajo costo y de doble banda para recolectar energía de RF de las bandas GSM-850, GSM-1900 y UMTS-2100 MHz. Ambas rectennas se basan en antenas monopolos con plano de tierra de tipo Defected Grounded Structure (DGS). La primera está diseñada con un anillo resonador cuadrado, el ancho de banda se encuentra entre 73.4 y 145 MHz, con una ganancia de 2.29 y 3.53 dBi. La segunda presenta un ancho de banda de 86 y 124.8 MHz con una ganancia de 1 y 3.8 dBi. Además, un rectificador de triple banda con un diodo Schottky HSMS-286C para mejorar la eficiencia de conversión de potencia de RF a CC. Los resultados de la medición muestran que se ha logrado recolectar entre 150 y 308 mV de CC durante 8 horas a 50 metros de una estación base de telefonía, en un total de 86 horas continuas de exposición a esta estación se ha obtenido un voltaje de CC que varía entre 4 y 4.50 voltios de energía de RF ambiental.

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Feng, Wenjie, Xin Gao e Wenquan Che. "Microstrip diplexer for GSM and WLAN bands using common shorted stubs". Electronics Letters 50, n. 20 (settembre 2014): 1486–88. http://dx.doi.org/10.1049/el.2014.2500.

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Bakır, Mehmet, Muharrem Karaaslan, Faruk Karadağ, Emin Ünal, Oguzhan Akgöl, Fatih Ö. Alkurt e Cumali Sabah. "Metamaterial-based energy harvesting for GSM and satellite communication frequency bands". Optical Engineering 57, n. 08 (31 agosto 2018): 1. http://dx.doi.org/10.1117/1.oe.57.8.087110.

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Foudazi, Ali, Hamid Reza Hassani e Sajad Mohammad ali nezhad. "Small UWB Planar Monopole Antenna With Added GPS/GSM/WLAN Bands". IEEE Transactions on Antennas and Propagation 60, n. 6 (giugno 2012): 2987–92. http://dx.doi.org/10.1109/tap.2012.2194632.

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Low, T. K. William, Zhi Ning Chen e Ning Yang. "Bent planar monopole operating at GSM/DCS/PCS/IMT2000 quad-bands". Microwave and Optical Technology Letters 40, n. 2 (2003): 170–72. http://dx.doi.org/10.1002/mop.11319.

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Più fonti

Tesi sul tema "Bande GSM"

Kowlgi, Srinivasan Sandeep. "Etude des émetteurs radiofréquences multistandards destinés aux stations de base GSM/WCDMA/LTE". Thesis, Paris, ENST, 2013. http://www.theses.fr/2013ENST0018/document.

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Les stations de base de télécommunications contemporaines pour les réseaux GSM / EDGE, WCDMA / HSPA et LTE sont de plus en plus complexes et à forte intensité énergétique. La solution privilégiée est un émetteur véritablement multi-standard. Modernes émetteurs des stations de base sont souvent multi-standard, en ce qu'ils peuvent supporter différentes normes ou de modes air-interface. Cependant, ce n'est pas réalisé par le fonctionnement simultané des normes différentes ou des «modes», mais par des moyens de reconfiguration, qui sont inefficaces et coûteux. Nous envisageons un émetteur entièrement multi-mode pratique capable de supporter simultanément GSM / EDGE, WCDMA / HSPA et LTE transporteurs. L'évolution des normes 3GPP vers un fonctionnement multi-mode est au stade embryonnaire. Pour contribuer à cet effort, notre travail revisite l'architecture traditionnelle de l'émetteur de station de base macro-cellule afin d'analyser et de définir les exigences de performance pour une plate-forme de radio cellulaire multi-standard. Notre analyse et la conception du système identifie également un goulot d'étranglement potentiel dans la chaîne multi-mode proposé, dont l'analyse est présentée. En conséquence, et enfin, nous proposons la conception d'un gain variable analogique modulateur en quadrature qui contourne le goulot d'étranglement, en soulignant la portée pour le développement futur et la validation de ce travail. Ce travail apporte également en avant quelques problèmes au niveau du système et met également en lumière les défis dans le fonctionnement des stations de base multi-standard
Contemporary telecommunication Base-Stations for GSM/EDGE, WCDMA/HSPA and LTE are increasingly complex and energy intensive. The favoured solution is a truly multi-standard transmitter known as a single Radio Access Network (single-RAN). Modern base station transmitters are often multi-standard, in that they can support different air-interface standards or modes. However, this is achieved not through concurrent operation of the different standards or 'modes', but by means of reconfiguration, which is inefficient and expensive. We envision a practical, fully multi-mode transmitter capable of simultaneously supporting GSM/EDGE, WCDMA/HSPA and LTE carriers. The evolution of 3GPP standards towards multi-mode operation is in the nascent stage. To contribute to this effort, our work revisits the architecture of the traditional macro-cell Base-Station transmitter in order to analyse and define performance requirements for a multi-standard cellular radio platform. Our system analysis and design also identifies a potential bottleneck in the proposed multi-mode chain, for which analysis is presented. Consequently and lastly, we propose the conceptual design of a variable-gain Analog Quadrature Modulator that bypasses the bottleneck, highlighting scope for future development and validation of this work. This work also brings forth some system-level issues and also highlights challenges in the operation of multi-standard Base-Stations. Some of these include multi-mode signal crest-factor reduction, carrier-to-carrier interference mitigation, per-carrier power-control, etc

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Kowlgi, Srinivasan Sandeep. "Etude des émetteurs radiofréquences multistandards destinés aux stations de base GSM/WCDMA/LTE". Electronic Thesis or Diss., Paris, ENST, 2013. http://www.theses.fr/2013ENST0018.

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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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Colin, Elizabeth. "Architecture reconfigurable pour la numérisation du signal radio de récepteurs mobiles multistandards". Paris, ENST, 2003. http://www.theses.fr/2003ENST0040.

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L'explosion de la téléphonie cellulaire et des normes de communications mobiles de couverture réduite (Wide, Local, Personal Area Networks, WAN, LAN et PAN), motivent de nombreuses études avec des approches très différentes. C'est dans ce contexte que s'inscrit ce travail de thèse qui propose une architecture reconfigurable pour la numérisation du signal radio de récepteurs mobiles multistandards. La première phase du travail cherche à déterminer la chaîne la mieux adaptée à la réception de différentes normes. Les récepteurs à conversion directe sont particulièrement adaptés à cette application car ils allient forte intégration et implémentation multi-standard. La deuxième phase propose une architecture reconfigurable GSM/UMTS pour la bande de base analogique. La troisième phase présente une méthode qui permet de définir un cahier de charges à partir des spécifications techniques d'une norme pour les différents blocs de la bande de base analogique. Cette méthode met en évidence les compromis entre les différentes fonctions. La quatrième décrit un convertisseur analogique-numérique GSM/UMTS et enfin, la conception d'un filtre anti-repliement GSM/UMTS
The mobile communications evolution requires receivers architectures ablle to process existing standards facilities, emerging services, and applications related to tne next generations. This Ph. D. Thesis presents a Reconfiguable Architecture for Analog-to-Digital Conversion of Multistandard Mobile RF receiver signals. It proposes the architecture best suited to handle various mobile standards. Homodyne receivers are particularly adapted because they combine strong integration and multistandard implementation. It presents an anlog baseband reconfigurable GSM/UMTS architectureIt shows a method to define specifications for each analog baseband block from the standard technical specifications. This method highlights the trade-off between the performed functions. It describes a GSM/UMTS analog-to-digital converter and finally, the design of a GSM/UMTS antialiasing filter

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Colin, Elizabeth. "Architecture reconfigurable pour la numérisation du signal radio de récepteurs mobiles multi-standards". Phd thesis, Télécom ParisTech, 2003. http://pastel.archives-ouvertes.fr/pastel-00000856.

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L'explosion de la téléphonie cellulaire et le déferlement de normes de communication mobiles de couverture réduite (Wide, Local, Personal Area Networks, WAN, LAN et PAN), motivent de nombreuses études avec des approches très différentes. C'est dans ce contexte que s'inscrit ce travail de thèse qui propose une architecture reconfigurable pour la numérisation du signal radio de récepteurs mobiles multistandards. De la transition progressive du GSM vers l'UMTS en Europe découle le besoin de terminaux bi-mode GSM/UMTS dans un futur proche. Pour cette raison nous avons appliqué cette étude à ces deux normes. La première phase du travail cherche à déterminer la chaîne la mieux adaptée à la réception de différentes normes. Les récepteurs à conversion directe ou homodynes sont particulièrement adaptés à cette application car ils allient forte intégration et implémentation multi-standard. Mais la flexibilité d'un tel système impose des contraintes sévères pour le traitement analogique en bande de base. En effet, la bande de réception dans son intégralité (60MHz pour l'UMTS) se retrouve en bande de base. La deuxième phase propose une architecture reconfigurable GSM/UMTS pour la bande de base analogique. Une fois l'architecture du récepteur choisie, nous avons défini les fonctions assurées par le traitement du signal en bande de base ainsi que les blocs qui la constituent. Puis nous avons déduit l'architecture qui répond le mieux au cahier des charges fixé, notamment en ce qui concerne la reconfigurabilité. Nous avons privilégié une architecture qui nous permette de réutiliser telle quelle ou de reconfigurer, le maximum de blocs afin qu'ils servent aussi bien pour le GSM que pour l'UMTS. La troisième phase présente une méthode qui permet de définir un cahier de charges à partir des spécifications techniques d'une norme, pour les différents blocs de la bande de base analogique, à savoir amplificateurs à gain variable, filtre anti-repliement et convertisseur analogique-numérique. Ceci sera fait en termes de dynamique et de linéarité pour tous les éléments de la bande de base. Pour les filtres, nous définirons en plus leurs gabarits. Cette méthode met en évidence les compromis entre les fonctions de filtrage anti-repliement, conversion analogique - numérique et amplification à gain variable. La quatrième décrit un convertisseur analogique-numérique GSM/UMTS et enfin, la conception d'un filtre anti-repliement reconfigurable GSM/UMTS. Lors de cette phase du travail notre réflexion s'est portée sur le degré de reconfigurabilité de ce bloc et sur la recherche du meilleur compromis entre flexibilité, performance et surface. Enfin, une conclusion récapitule les principaux résultats obtenus et présente les perspectives.

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Paiva, João Manuel Lima. "Análise da QoS na perspectiva do utilizador dos serviços mais comuns em sistemas celulares GSM e UMTS". Master's thesis, Universidade de Aveiro, 2007. http://hdl.handle.net/10773/1877.

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Mestrado em Engenharia Electrónica e Telecomunicações
O aparecimento da tecnologia GSM mudou significativamente o panorama das telecomunicações. Desde que surgiram as primeiras redes comerciais,em 1991, o número de utilizadores tem aumentado continuamente. Mais recentemente, os sistemas celulares de terceira geração, entre osquais o UMTS, vieram colmatar algumas insuficiências do GSM aopermitirem acessos de alto débito para suporte de serviços de banda larga,tais como, acesso à Internet e aplicações multimédia. Actualmente, face às elevadas taxas de penetração e de utilização dos sistemas GSM e UMTS, a qualidade de serviço na perspectiva do utilizador assume-se como uma das principais vantagens competitivas dosoperadores presentes no mercado.Cada vez mais os consumidores procuram nos serviços simplicidade de utilização e qualidade superior, ininterruptamente e em qualquer lugar. Nesta dissertação são definidos indicadores de qualidade de serviço eperfis de medida que permitem avaliar o desempenho dos serviços de telefonia (voz e videotelefonia), mensagens (SMS e MMS) e dados (HTTPbrowsing, FTP upload/download e E-Mail send/receive) suportados em sistemas de comunicações móveis GSM e UMTS. Para validação dos indicadores de desempenho e perfis de medida,apresentam-se os resultados de uma análise aos serviços de telefonia, mensagens e dados, de dois operadores GSM/UMTS portugueses. ABSTRACT: The advent of GSM has changed significantly the telecommunications landscape. Since the launch of the first commercial network, in 1991,the number of subscribers has increased continuously. More recently, third generation cellular systems, in particular UMTS, went beyond GSM limitations, leveraging high-speed access and broadband services, such as internet and multimedia applications. Nowadays, due to high penetration and usage of GSM and UMTS systems, the quality of service built upon the user’s point of view is one ofcornerstones where operators seek to take competitive advantages. Consumers increasingly search for ease-of-use and superior quality, anytime and anywhere. This dissertation provides quality of service indicators and measurement profiles that allow a performance evaluation, on telephony (voice and video), messaging (SMS and MMS) and data (HTTP browsing, FTPupload/download and E-mail send/receive) services, of the GSM and UMTS mobile communications systems. To validate the performance indicators and the measurement profiles, the results of an analysis on telephony, messaging and data services,of two Portuguese GSM/UMTS operators, are provided.

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Bachhav, Pramod. "Explicit memory inclusion for efficient artificial bandwidth extension". Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS492.

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La plupart des algorithmes ABE exploitent les informations contextuelles ou la mémoire capturée via l'utilisation de caractéristiques statiques ou dynamiques extraites de trames de parole voisines. L'utilisation de la mémoire entraîne des caractéristiques dimensionnelles plus élevées et une complexité informatique accrue. Lorsque les informations provenant de trames de prévisualisation sont également utilisées, la latence augmente également. Les travaux antérieurs montrent l'avantage pour ABE d'exploiter la mémoire sous la forme d'entités dynamiques avec un modèle de régression standard. Même dans ce cas, la littérature manque d'une analyse quantitative de l'avantage relatif de l'inclusion de mémoire explicite. La recherche présentée dans cette thèse évalue dans quelle mesure la mémoire explicite est utile et rapporte en outre un certain nombre de techniques différentes qui permettent son inclusion sans augmentation significative de la latence et de la complexité de calcul. Les avantages sont démontrés à la fois par une analyse quantitative avec une mesure basée sur la théorie de l'information et par des tests d'écoute subjectifs. Les principales contributions concernent la préservation de l'efficacité des calculs grâce à l'utilisation de la réduction de dimensionnalité sous la forme d'une analyse en composantes principales, d'auto-encodeurs superposés semi-supervisés et d'auto-encodeurs variationnels conditionnels. Les deux dernières techniques optimisent la réduction de la dimensionnalité pour offrir une performance ABE supérieure
Most ABE algorithms exploit contextual information or memory captured via the use of static or dynamic features extracted from neighbouring speech frames. The use of memory leads to higher dimensional features and increased computational complexity. When information from look-ahead frames is also utilised, then latency also increases. Past work points toward the benefit to ABE of exploiting memory in the form of dynamic features with a standard regression model. Even so, the literature is missing a quantitative analysis of the relative benefit of explicit memory inclusion. The research presented in this thesis assesses the degree to which explicit memory is of benefit and furthermore reports a number of different techniques that allow for its inclusion without significant increases to latency and computational complexity. Benefits are shown through both a quantitative analysis with an information-theoretic measure and subjective listening tests. Key contributions relate to the preservation of computational efficiency through the use of dimensionality reduction in the form of principal component analysis, semisupervised stacked autoencoders and conditional variational auto-encoders. The two latter techniques optimise dimensionality reduction to deliver superior ABE performance

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Park, Yunseo. "Direct Conversion RF Front-End Implementation for Ultra-Wideband (UWB) and GSM/WCDMA Dual-Band Applications in Silicon-Based Technologies". Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7563.

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This dissertation focuses on wideband circuit design and implementation issues up to 10GHz based on the direct conversion architecture in the CMOS and SiGe BiCMOS technologies. The dissertation consists of two parts: One, implementation of a RF front-end receiver for an ultra-wideband system and, two, implementation of a local oscillation (LO) signal for a GSM/WCDMA multiband application. For emerging ultra-wideband (UWB) applications, the key active components in the RF front-end receiver were designed and implemented in 0.18um SiGe BiCMOS process. The design of LNA, which is the critical circuit block for both systems, was analyzed in terms of noise, linearity and group delay variation over an extemely wide bandwidth. Measurements are demonstrated for an energy-thrifty UWB receiver based on an MB-OFDM system covering the full FCC-allowed UWB frequency range. For multiband applications such as a GSM/WCDMA dual-band application, the design of wideband VCO and various frequency generation blocks are investigated as alternatives for implementation of direct conversion architecture. In order to reduce DC-offset and LO pulling phenomena that degrade performance in a typical direct conversion scheme, an innovative fractional LO signal generator was implemented in a standard CMOS process. A simple analysis is provided for the loop dynamics and operating range of the design as well as for the measured results of the factional LO signal generator.

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Otárola, Correa Diego Antonio, e Gonzales Frank Campos. "Modernización de la red de acceso de un operador móvil para el caso de Lima Metropolitana". Bachelor's thesis, Universidad Ricardo Palma, 2015. http://cybertesis.urp.edu.pe/handle/urp/1277.

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La presente tesina titulada “Modernización de la red de acceso de un operador móvil para el caso de Lima Metropolitana” expone una propuesta para un operador que tiene como objetivo poder incrementar su cobertura de servicio de segunda y cuarta generación, para esto se definen conceptos teóricos en base a lo que son las tecnologías de telefonía móvil celular de tipo GSM, UMTS y LTE y se compararan con las características técnicas de los equipos que se plantean usar demostrándose que estos pueden optimizar la red de acceso del operador en cobertura y funcionamiento para brindar un mejor servicio en base a 2G y 4G. Para lograr el objetivo propuesto, esta tesina describe el diseño y dimensionamiento de proyecto, pasos para su ejecución, especificaciones técnicas de los equipos, procedimiento para la puesta en servicio y resultados en base a pruebas del servicio y KPI. The current thesis entitled “Modernización de la red de acceso de un operador móvil para el caso de Lima Metropolitana” exposes a proposal for a mobile operator that has as a target increase their second and fourth generator coverage. For achieve this we have to defined theoric concepts based on the mobile telecommunication technology GSM, UMTS and LTE and compare with the features of equipment proposed to use proving that the coverage and performance of the access network of the operator can be improved for provide a better 2G and 4G service. For achieve this target proposed, this thesis describes the design and sizing of Project, steps for execution, technical features of equipment, on air procedure and results base on the testing service and KPI.

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Ahmed, Mamun. "Adaptive Sub band GSC Beam forming using Linear Microphone-Array for Noise Reduction/Speech Enhancement". Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6174.

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This project presents the description, design and the implementation of a 4-channel microphone array that is an adaptive sub-band generalized side lobe canceller (GSC) beam former uses for video conferencing, hands-free telephony etc, in a noisy environment for speech enhancement as well as noise suppression. The side lobe canceller evaluated with both Least Mean Square (LMS) and Normalized Least Mean Square (NLMS) adaptation. A testing structure is presented; which involves a linear 4-microphone array connected to collect the data. Tests were done using one target signal source and one noise source. In each microphone’s, data were collected via fractional time delay filtering then it is divided into sub-bands and applied GSC to each of the subsequent sub-bands. The overall Signal to Noise Ratio (SNR) improvement is determined from the main signal and noise input and output powers, with signal-only and noise-only as the input to the GSC. The NLMS algorithm signiﬁcantly improves the speech quality with noise suppression levels up to 13 dB while LMS algorithm is giving up to 10 dB. All of the processing for this thesis is implemented on a computer using MATLAB and validated by considering different SNR measure under various types of blocking matrix, different step sizes, different noise locations and variable SNR with noise.
Mamun Ahmed E-mail: mamuncse99cuet@yahoo.com

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Libri sul tema "Bande GSM"

Page, Phil, e Todd Ellenbecker. Strength Band Training. 3^a ed. Human Kinetics, 2020. http://dx.doi.org/10.5040/9781718225565.

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The top resource on strength band training is now expanded, updated, and better than ever! Whether you are training in the gym, at home, or on the road, Strength Band Training will show you how to maximize strength, speed, and flexibility. Featuring more than 160 exercises and 27 fitness and sport-specific workouts, you will discover why strength bands are the ultimate tool for targeting, isolating, rehabilitating, and developing every major muscle group. In this third edition, you will find a strength assessment index to measure your progress, new chapters on training for older adults and rehabilitation, training tips connecting research to specific exercises, and injury prevention recommendations. Full-color photo sequences accompany the detailed descriptions of each exercise, ensuring safe and proper execution. The exercises allow you to add resistance in multiple directions for routines that simulate sport-specific demands, improve strength, enhance movement, or target muscles to help prevent or recover from common injuries. Whether you are using flat bands or tubing, seeking performance gains or muscle mass, Strength Band Training provides authoritative advice, the most effective exercises, and proven workouts to achieve your goals.

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Hein, Kerstin, Cathleen Heil, Silke Ruwisch e Susanne Prediger, a cura di. Beiträge zum Mathematikunterricht 2021 - vom GDM-Monat 2021 der Gesellschaft für Didaktik der Mathematik (GDM) (1.-25. März 2021). WTM-Verlag Münster, 2021. http://dx.doi.org/10.37626/ga9783959871846.0.

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Der Band enthält die Beiträge des GDM-Monats 2021, der statt der alljährlichen GDM-Tagung online vom 1.-25. März 2021 stattfand. Dabei handelt es sich um die Hauptvorträge und die Beiträge aus den Minisymposien bzw. die Zusammenfassung einer Podiumsdiskussion.

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Sturm, Nina, Benjamin Rott e Lukas Baumanns, a cura di. Mit Abstand die beste Tagung. Tagungsband der Herbsttagung des GDM-Arbeitskreises Problemlösen 2020. WTM-Verlag Münster, 2021. http://dx.doi.org/10.37626/ga9783959871945.0.

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Auch im Herbst 2020 hat sich der GDM-Arbeitskreis Problemlösen – trotz oder gerade wegen der im Hinblick auf Treffen im Allgemeinen und Tagungen im Speziellen schwierigen Situation aufgrund der Corona-Pandemie – zusammengefunden, um sich über aktuelle Erkenntnisse und Überlegungen aus dem Themenfeld des Problemlösens und -stellens auszutauschen. Aufgrund der Maßnahmen zur Bekämpfung der Pandemie wurde diese Herbsttagung – anders als sonst – nicht in Präsenz, sondern auf Distanz abgehalten: Am 7. und 8. Oktober 2020 haben sich Interessierte des mathematischen Problemlösens online zusammengefunden. Diese Umstände haben aber keineswegs die Qualität der Inhalte und Diskussionen beeinträchtigt. Aus den Vorträgen und Diskussionen während der Herbsttagung haben acht Beiträge ihren Weg in den vorliegenden Tagungsband gefunden: Neben Überlegungen zum Rückwärtsarbeiten, dem Verständnis problemhaltiger Aufgaben in zentralen Abschlussprüfungen und Überlegungen im Hinblick auf Heurismen, sind in diesem Band auch Praxisbeträge enthalten, in denen das Problemlösen mittels digitaler Werkzeuge beleuchtet wird.

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Thiele, Clemens. GGV und HMA Österreichisches und Europäisches Design- und Musterschutzrecht - Band 2. Verlag Österreich, 2020. http://dx.doi.org/10.33196/9783704686596.

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Systematischer Praxiskommentar zum Musterschutzrecht Dieses Werk vervollständigt den auf zwei Bände angelegten "Österreichischen und Europäischen Designrechtskommentar". Das Gesamtwerk bietet Anwenderinnen und Anwendern einen systematischen Praxiskommentar für einen schnellen Zugriff auf Lösungen, die mit der Rechtsprechung und den unionsrechtlichen Vorgaben im Einklang stehen. Kernstück von Band II bildet die Kommentierung der Gemeinschaftsgeschmacksmusterverordnung (GGV). Diese hat vor fast zwanzig Jahren ein unionsweites Recht des geistigen Eigentums, das sogenannte Gemeinschaftsgeschmacksmuster (GGM) oder - moderner ausgedrückt - das Unionsdesign geschaffen. Ein auf die einzelne Regelung abgestimmtes Literaturverzeichnis sowie ein klares Gliederungsschema erleichtern den raschen Zugriff auf Tatbestandelemente und Rechtsfolgen. Ein verfahrensrechtlicher Abschnitt rundet die Kommentierung ab. Der zweite Teil des Werkes enthält die durchgängige Erläuterung des Haager Musterabkommens (HMA). Über 1.200 Entscheidungen von EuGH, EuG, EGMR, OGH, BGH, BPatG, österr und dt OLG sowie LG, BK-EUIPO und NA-EUIPO wurden in das Werk systematisch eingearbeitet und verständlich gemacht.

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Gomez, Jeff. Math Rock. Bloomsbury Publishing Inc, 2024. http://dx.doi.org/10.5040/9798765103401.

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Math rock sounds like blueprints look: exact, precise, architectural. This trance-like progressive metal music with indie rock and jazz influences has been captivating and challenging listeners for decades. Bands associated with the genre include King Crimson, Black Flag, Don Caballero, Slint, American Football, Toe, Elephant Gym, Covet, and thousands more. In an online age of bedroom producers and sampled beats and loops, math rock is music that is absolutely and resolutely played: men and woman in rooms with instruments creating chaos, beauty, and beautiful chaos. This is the first book-length look at the global phenomenon. Containing interviews with prominent musicians, producers, and critics spanning the globe, Math Rock will delight longtime fans while also serving as a primer for those who want to delve deeper. It shows why and how an intellectually complex, largely faceless, and almost entirely instrumental form of music has been capturing the attention of listeners for 50 years—and counting.

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Beyerl, Maria, Julia Fritz, Ana Kuzle, Meike Ohlendorf e Benjamin Rott, a cura di. Mathematische Problemlösekompetenzen fördern – Tagungsband der Herbsttagung des GDM-Arbeitskreises Problemlösen in Braunschweig 2016. WTM-Verlag Münster, 2017. http://dx.doi.org/10.37626/ga9783959870627.0.

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Das (mathematische) Problemlösen ist und bleibt ein hochaktuelles Thema der Bildungswissenschaften, der Psychologie und – nicht zuletzt – der Fachdidaktik (Mathematik). Es ist allgemeiner Konsens, dass das Problemlösen zu den Schlüsselkompetenzen gehört, die von Lernenden in allen Jahrgangsstufen der Schulausbildung und im Studium erworben werden sollten. Ebenfalls unumstritten ist, dass insbesondere die Mathematikausbildung einen wichtigen Beitrag hierzu leisten kann. Aber wie kann dies erfolgen? Unter dem Motto „Mathematische Problemlösekompetenzen fördern“ fand am 14. und 15.10.2016 an der TU Braunschweig die dritte Herbsttagung des Arbeitskreises Problemlösen der Gesellschaft für Didaktik der Mathematik statt. Die beiden Hauptaktivitäten der Tagung, in denen Maßnahmen und Projekte zur Förderung der Problemlösekompetenz vorgestellt und diskutiert wurden, waren ein Vortrag von Harald Schaub aus der psychologischen und ein Workshop aus der mathematikdidaktischen Perspektive. Die zugehörigen Beiträge im vorliegenden Buch bieten einen guten Überblick über den derzeitigen Stand der deutschsprachigen Problemlöseforschung. Des Weiteren fanden neun Präsenta-tionen – vorwiegend von Nachwuchswissenschaftlerinnen und Nachwuchswissenschaftlern – zu verschiedenen Aspekten des Lernens und Lehrens über, von und durch Problemlösen statt. Die zugehörigen Ausarbeitungen in diesem Band bieten einen Blick in brandaktuelle Forschung und wichtige (Zwischen-) Ergebnisse laufender Forschungsprojekte.

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Steinweg, Anna Susanne. Blick auf Schulcurricula Mathematik: Empirische Fundierung? : Tagungsband des AK Grundschule in der GDM 2021. University of Bamberg Press, 2021. http://dx.doi.org/10.20378/irb-51936.

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Mathematische Bildung in der Grundschule ist eine herausfordernde und langfristige Aufgabe und unterliegt curricularen Wandlungen. Mit Fokus auf Erkenntnisse aus empirischen Forschungen werden im Rahmen von drei Hauptvorträgen aus verschiedenen Inhaltsperspektiven curriculare Wandlungen im Mathematikunterricht der Grundschule betrachtet und diskutiert. Zusätzlich setzten sich sieben Arbeitsgruppen mit den Themenfeldern ‚Arithmetik‘, ‚Geometrie‘, ‚Daten, Zufall und Wahrscheinlichkeit‘, ‚Kommunikation & Kooperation‘, ‚Lernen, Lehren und Forschen mit digitalen Medien‘, ‚Frühe mathematische Bildung‘ sowie ‚Lehrer:innenbildung‘ intensiv mit aktuellen Forschungs- und Praxisfragen auseinander. Die zentralen Inhalte der Arbeitsgruppen sind in diesem Band ebenfalls dokumentiert. The Proceedings of the 2021 Conference of the Research Group on Primary Mathematics Education (Arbeitskreis Grundschule in der GDM) focus on empirical foundation of curricula in mathematics education in primary school. Three invited talks addressed the main theme in plenum. Additionally, workings groups on the research areas arithmetic, geometry, data & probability, as well as groups on early mathematics education, communication & co-operation, ICT education, and last not least on teacher education offered discussions on current research issues.

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Fischer, Hans, e Tilman Sauer, a cura di. Exkursionen in die Geschichte der Mathematik und ihres Unterrichts. WTM-Verlag Münster, 2021. http://dx.doi.org/10.37626/ga9783959871860.0.

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Mathematikgeschichte verbindet Mathematik, Naturwissenschaften und Geisteswissenschaften. Die Entwicklung der Mathematik ist immer auch eine Veränderung einer gesellschaftlichen Praxis, Mathematik zu betreiben und diese durch stabile Formen wie Institutionen, mathematische Werkzeuge und mathematische Sprache zu etablieren. Besonders die jüngere Geschichte der Vermittlung von Mathematik in Schule und Universität baut weitere Brücken zu Themen, die in der Psychologie, den Sozial- und Politikwissenschaften angesiedelt sind. Die integrative Sicht auf Geschichte der Mathematik prägt die gemeinsamen, im zweijährigen Turnus stattfindenden Tagungen der Fachsektion Geschichte der Mathematik der DMV und des Arbeitskreises Mathematikgeschichte und Unterricht der GDM. Dieser Tagungsband zur Mainzer Tagung, welche vom 29. Mai bis 2. Juni 2019 im Erbacher Hof stattfand, zeigt den fachübergreifenden und durch Perspektivenvielfalt geprägten Charakter dieser Tagungsreihe. Das gemeinsame Anliegen der Teilnehmerinnen und Teilnehmer, die Vorstellungen von einer oft als unveränderlich und fertig wahrgenommenen Wissenschaft Mathematik zu bereichern und zu erweitern, wird in dem vorliegenden Band auf mannigfaltige Art verwirklicht.

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McCall, Pete. Smarter Workouts. Human Kinetics, 2019. http://dx.doi.org/10.5040/9781718225527.

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What are the biggest obstacles to sticking to a workout plan? You don’t have enough time? It costs too much? You don’t have enough equipment? You don’t know how to get the results you want? Now you can set those excuses aside. Smarter Workouts gives you the solution you need with efficient and effective workout programs that use only one piece of equipment. You can work out in a short period of time without spending a lot of money on expensive equipment or gym memberships—all while targeting your personal goals. Fitness expert Pete McCall explains the effects of exercise on your body so you can identify what will work best for you. He gives you access to fat-burning workouts that help you work smarter to produce real results. First, choose your target: improving mobility for better balance and coordination, amping up your metabolism with sweat-inducing conditioning work, or strengthening your core for better functional movement. Then select one of seven equipment options: • Bodyweight • Dumbbell • Kettlebell • Medicine ball • Stability ball • Sandbag • Resistance band Armed with a variety of exercises and organized plans, you’ll flow quickly through your workouts, saving precious time and experiencing real results. Put an end to your frustration and let Smarter Workouts be your go-to guide for smart, effective workouts. Need continuing education? A companion continuing education exam is available for purchase. See the back page for details.

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Broussal-Derval, Aurélien. Training and Conditioning for Judo. Human Kinetics, 2019. http://dx.doi.org/10.5040/9781718225732.

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“Whether you’re training for judo, mixed martial arts, or wrestling, the diverse programming options in Training and Conditioning for Judo will help you meet the constantly changing demands of your physical, mental, and technical training.” —Colton Brown, U.S. Judo Athlete and Olympian “Aurélien’s strength and conditioning methodology was so specific that it helped me transfer my power from the gym to the mat.” —Gemma Gibbons, Silver Medal Winner at the 2012 Olympics “Training and Conditioning for Judo goes beyond training and straight to the heart of winning. It will train, prepare, and inspire you to excel. Truly a must-have.” —Alex Turner, U.S. Judo Athlete and Olympian Long one of the world’s most popular sports, judo is also one of the most physically demanding. Success requires hard work, dedication, support, and a no-nonsense, comprehensive training program—one specific to the sport as well as the individual attributes of the athletes who compete in it. Enter Training and Conditioning for Judo. A blend of science and tradition, Training and Conditioning for Judo delivers comprehensive, yet practical, programming for serious judokas and their senseis, instructors, and trainers. This integrated approach merges strength, speed, agility, and endurance training with judo-specific drills and activities, ensuring total preparation for combat, competition, and all-around excellence. With diverse programming options that will help you avoid performance plateaus, you’ll find training methodologies to incorporate into daily workouts: Muscle strengthening exercises for balance control, increased power, and improved kumikataEndurance training through running, power and lactic circuits, and uchi-komi to improve overall conditioningPlanning strategies for recovery cycles and tapering to time peak performance with competitionsRecovery and prevention protocols to keep the body resilient and to avoid injury You’ll use bodyweight, machines, medicine and stability balls, ropes, bands, and straps to keep training options fresh. Whether you’re a young or senior judoka, male or female, lightweight or heavyweight, you will develop the physical abilities needed to take down your opponent with force and confidence. With a black belt in both judo and Brazilian jujitsu and experience that includes training the British and Russian Olympic judo teams, Aurélien Broussal-Derval is uniquely qualified to help judokas—from beginners to competitive black belts—develop the balance, coordination, and power needed for success on the mat.

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Capitoli di libri sul tema "Bande GSM"

Marsan, Marco Ajmone, Michela Meo e Matteo Sereno. "GSPN Models of Dual-Band GSM Networks". In Communication-Based Systems, 1–15. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9608-4_1.

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Raj, Dhivya, e C. V. Anil Kumar. "Double-Band Coplanar Antenna for GSM and UWB Applications". In Lecture Notes in Electrical Engineering, 443–51. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3992-3_37.

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Zaidi, Aijaz M., Syed A. Imam e Binod K. Kanaujia. "A Compact Dual-Band N-Way Wilkinson Power Divider for GSM". In Advances in Power Systems and Energy Management, 263–74. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4394-9_27.

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Suresh, B., Satyanarayana Murthy e B. Alekya. "Frequency Reconfigurable of Quad-Band MIMO Slot Antenna for Wireless Communication Applications in LTE, GSM, WLAN, and WiMAX Frequency Bands". In Intelligent Sustainable Systems, 271–87. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2894-9_21.

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Singh, Vishal, Vinay Shankar Pandey e Vivek Shrivastava. "A Wideband Star-Shaped Rectenna for RF Energy Harvesting in GSM Band". In Lecture Notes in Mechanical Engineering, 163–73. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5463-6_15.

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Bidwai, Sandeep, Shilpa Mayannavar e Uday V. Wali. "Performance Comparison of Markov Chain and LSTM Models for Spectrum Prediction in GSM Bands". In Machine Learning for Predictive Analysis, 289–98. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7106-0_29.

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Passi, Abhiruchi, e Vimlesh Singh. "Design and Analysis of New Dual-Channel Microstrip Diplexer for GSM and WLAN Band Applications". In Lecture Notes in Networks and Systems, 283–92. Singapore: Springer Nature Singapore, 2024. https://doi.org/10.1007/978-981-97-1943-3_25.

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Ansal, K. A., Akhila Ann Kuruvilla, S. Keerthana, Keerthi Mariam Harries, Varsha Susan Johns e Anu Raj. "A Dual Band Metamaterial Loaded CPW-Fed Antenna for GSM, WLAN, LTE and RFID Applications". In Futuristic Communication and Network Technologies, 461–68. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4625-6_45.

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Meo, Michela, e Marco Ajmone Marsan. "Accurate Approximate Analysis of Dual-Band GSM Networks with Multimedia Services and Different User Mobility Patterns". In Lecture Notes in Computer Science, 315–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-540-46642-0_46.

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Roy, Avisankar, Sunandan Bhunia, Debasree Chanda Sarkar e Partha Pratim Sarkar. "Compact Dual Band Microstrip Antenna Using Square Loop Slot for GSM 1800 and HiperLAN-2 Applications". In Lecture Notes in Electrical Engineering, 35–43. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0829-5_4.

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Atti di convegni sul tema "Bande GSM"

Ersöz, Mehmet Sami, Feza Turgay Çelik e Kâmil Karaçuha. "Dual Band Dual Polarized Antenna Design for GSM and 5G Applications". In 2024 15th National Conference on Electrical and Electronics Engineering (ELECO), 1–5. IEEE, 2024. https://doi.org/10.1109/eleco64362.2024.10847093.

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Begg, Mirza Wazed Ahmed, e Sudipta Maity. "Analysis of a Concave Cylindrical Rectangular Microstrip Antenna for GSM-band Application". In 2024 IEEE Microwaves, Antennas, and Propagation Conference (MAPCON), 1–4. IEEE, 2024. https://doi.org/10.1109/mapcon61407.2024.10923592.

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Das, Hangsa Raj, Rajesh Dey e Sumanta Bhattacharya. "DESIGN OF RECTANGULAR SHAPED SLOTTED MICRO STRIP ANTENNA FOR TRIPLE FREQUENCY OPERATION FOR WIRELESS APPLICATION". In Topics in Intelligent Computing and Industry Design. Volkson Press, 2021. http://dx.doi.org/10.26480/etit.02.2020.169.172.

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This Paper represents the designing of the Tri- Band Rectangular Printed micro strip Antenna. One amongst the simplest feeding technique is employed i.e. coaxial feeding technique for feeding the antenna Tri band antenna is obtained by etching two quarter wavelength rectangular shaped slots inside the patch at the proper position to resonate over GSM, Bluetooth and Wi- MAX. The proposed antenna is realized on FR-4 dielectric substrate having a dielectric constant of 4.4 and loss tangent of 0.02, with dimensions of 46x38x1.6mm3. The design calculations are done for the frequency of 2.4 GHz. The designed antenna is simulated using EM simulation software CAD FEKO suite (7.0). The antenna covers the three bands of operation i.e. GSM (1.834-1.858GHz), Bluetooth (2.422- 2.487GHz), Wi-Max (3.519-3.583GHz) with reflection coefficient ≤-10dB. The overall simulation results shows that the antenna gives good impedance matching at desired frequencies with VSWR≤2.Also the radiation pattern, efficiency,gain and impedance for all four frequencies are investigated using simulation results.

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Loutridis, Abraham, Kansheng Yang, Matthias John e Max J. Ammann. "Dual band printed antenna for M2M applications in ISM and GSM bands". In 2015 Loughborough Antennas & Propagation Conference (LAPC). IEEE, 2015. http://dx.doi.org/10.1109/lapc.2015.7366052.

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Bonefacic, D., B. Rapinac e J. Bartolic. "Slotted PIFA for GSM band". In 2nd European Conference on Antennas and Propagation (EuCAP 2007). Institution of Engineering and Technology, 2007. http://dx.doi.org/10.1049/ic.2007.0959.

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Venneri, Francesca, e Sandra Costanzo. "A dual-band compact metamaterial absorber for RF energy harvesting at GSM bands". In 4th URSI Atlantic RadioScience Conference. Gent, Belgium: URSI – International Union of Radio Science, 2024. http://dx.doi.org/10.46620/ursiatrasc24/ikhf7275.

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Díaz Zayas, Almudena, Pedro Merino Gómez e Francisco Javier Rivas Tocado. "3GPP NB-IoT, tecnología y herramientas de medida". In XIII Jornadas de Ingenieria Telematica - JITEL2017. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/jitel2017.2017.6577.

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La primera versión de los estándares 3GPPNarrow Band-IoT (NB-IoT) se finalizó en Junio de 2016como parte de la Release 13. NB-IoT es una nueva tecnologíade acceso radio que puede coexistir con los desplieguesactuales de GSM, UMTS y LTE. De hecho, la especificaciónde NB-IoT se ha integrado en los estándares LTE. NBIoTva un paso más allá que la especificación de MTC(Machine Type Communication), enfocándose en dispositivosde extremadamente bajo coste, despliegues masivos y tasas detransmisión reducidas con un ancho de banda de solamente200 kHz (de ahí su nombre). En este artículo realizaremosuna revisión en detalle de las especificaciones 3GPP destacandolas modificaciones necesarias sobre los despliegues LTEtradicionales para proporcionar conectividad a dispositivosde usuario (UEs) Cat-NB1. Asimismo, introduciremos unaperspectiva novedosa sobre las ventajas de usar de nuevasherramientas y soluciones para el análisis y medida decomunicaciones NB-IoT, como el UXM E7515A de KeysightTechnologies, proporcionando también lecciones aprendidasen el incipiente uso de esta nueva tecnología.

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Mazurek, Pawel A., e Oleksandr M. Naumchuk. "Electromagnetic emission testing in GSM band". In 2017 International Conference on Electromagnetic Devices and Processes in Environment Protection with Seminar Applications of Superconductors (ELMECO & AoS). IEEE, 2017. http://dx.doi.org/10.1109/elmeco.2017.8267730.

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Njoku, Chinwe C., William Whittow e Chinthana Panagamuwa. "Printable windscreen quad-band GSM antenna". In Propagation Conference (LAPC). IEEE, 2009. http://dx.doi.org/10.1109/lapc.2009.5352528.

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Santosh, Sourabh, e Sushrut Das. "A GSM Band RF Sensor Antenna". In 2022 International Symposium on Antennas and Propagation (ISAP). IEEE, 2022. http://dx.doi.org/10.1109/isap53582.2022.9998693.

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Rapporti di organizzazioni sul tema "Bande GSM"

Edeh, Henry C. The Effect of the Liberian Government’s Taxation Policies on Poverty and Inequality. Institute of Development Studies, ottobre 2024. http://dx.doi.org/10.19088/ictd.2024.102.

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Abstract (sommario):

Many low- and middle-income countries engage in tax policy reforms. This is usually motivated by efforts to increase tax revenue collection, and also sometimes to improve equity by reducing the burden of taxation on relatively poorer taxpayers. However, little is known about the extent to which these tax policy reforms affect poverty and inequality, especially at the household level. This study exhaustively analyses the progressivity and effect of taxation policies on poverty and inequality in Liberia, a low-income country, for the first time. After accounting for the informal sector, personal income tax (PIT) was found to be progressive in the pre-2011 tax scheme. However, it is more progressive in the post-2011 tax scheme. The pre-2011 PIT reduced inequality, but increased poverty. The post-2011 PIT also reduced inequality, but there was no incremental change on poverty. A simulated scheme, with a 75 per cent reduction in tax rates for lower taxable income bands, and 75 per cent increase in tax rates for higher taxable income bands, was found to be even more progressive. The simulation also confirmed the reduction in inequality and zero increase in poverty found in the current scenario. Goods and services tax (GST) was found to be progressive in both the pre-2016 and post-2016 GST schemes – implying that the rich pay more GST through their higher purchase of non-food taxable items. GST marginally reduced inequality but increased poverty in the pre-2016 scheme. The post-2016 GST scheme marginally increased inequality and substantially increased poverty. A simulated scheme, with a lower effective GST rate on taxable expenditure below a predefined threshold, and a higher rate on taxable expenditure above the threshold, was found to be more progressive. In addition, the simulation led to a greater reduction in inequality and limited increase in poverty. We suggest that increasing the current rate of PIT by 75 per cent for top income earners, and setting differentiated GST rates (5 per cent of effective GST on lower taxable expenditure and 95 per cent on higher taxable expenditure) will help to boost the equity of, and redistribution from, the Liberian tax system.

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Tóth, Z., B. Dubé, B. Lafrance, V. Bécu, K. Lauzière e P. Mercier-Langevin. Whole-rock lithogeochemistry of the banded iron-formation-hosted gold mineralization in the Geraldton area, northwestern Ontario. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331919.

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This report releases 235 runs of whole-rock geochemical and assay results of 235 samples/subsamples from the Archean banded iron formation-hosted gold mineralization in the Geraldton area, eastern Wabigoon subprovince, northwestern Ontario. The samples were collected during the 2012, 2013, 2014 and 2016 field seasons as part of a PhD study by the senior author (T�th, 2018) at Laurentian University in Sudbury. Geochemical analyses were paid in part by the GSC for the 2012, 2013 samples, while the 2014 and 2016 samples were graciously paid by the second author, Bruno Lafrance and Greenstone Gold Mines, respectively. Research on gold mineralization hosted in banded iron formation BIF was conducted under the Lode Gold project of TGI4. The geochemical data is presented in a format easily importable in a geographic information system (GIS). Samples were collected from drill core and outcrops to document host units, the alteration halo, and the mineralized zones. Preliminary interpretations about the auriferous mineralization and its geological setting are presented in Lafrance et al. (2012) and in T�th et al. (2013a, 2013b, 2014, 2015a, 2015b). The final interpretation of the geological setting of the gold mineralization was published in T�th and others (2022, 2023). Sample information and geochemical results are presented in Appendices 1 and 2 (worksheet "Results"), respectively. The results worksheet combines 5 reports produced between 2012 and 2016.

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Farahbod, A., e J. F. Cassidy. Spatial and temporal variations in seismic coda Q attenuation in the lower St. Lawrence region, southeastern Quebec. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/332027.

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We investigate seismic attenuation characteristics of the Lower St. Lawrence seismic zone in southeastern Quebec. This zone is located ~400 km downstream from Quebec City and is between the Quebec North Shore and the Lower St. Lawrence. We used earthquake recordings from 5 broadband and 5 short period seismograph stations of the Canadian National Seismic Network (CNSN) across the region. Our dataset is comprised of 847 earthquakes recorded between 1985 and 2022 with magnitudes ranging from 2.0 to 5.1, depths from 0 to 30 km and epicentral distances of 5 to 100 km. This gives a total of 446 high signal-to-noise (S/N) traces (S/N?5.0) useful for QC calculation (with a maximum ellipse parameter, a2, of 100) across the region. Coda windows were selected to start at tc = 2tS (two times the travel time of the direct S wave), and were filtered at center frequencies of 2, 4, 8, 12 and 16 Hz. Our study reveals a consistent pattern. We find that the lowest overall average of Q0 (Q at 1 Hz) values are at the three stations (GSQ, ICQ and SMQ) within 100 km of a moderate earthquake of mN 5.1 in 1999 (e.g., Q0 of 81, 88 and 80, respectively). We determined temporal variations in attenuation following the 1999 earthquake. The overall average of Q0 decreased from 87 (before the mainshock) to 77 (GSQ, D=96 km), from 92 to 85 (ICQ, D=69 km) and from 88 to 82 (SMQ, D=73 km). These results are in agreement with global studies that show a decrease in Q0 following a significant earthquake, (e.g., M &gt; 5) likely the result of increased fracturing and fluids in the epicentral region. An average for all the data results in a Q relationship of QC = 86f1.07 for the frequency band of 2 to 16 Hz for the entire region.

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