Recursos de colección

Archivo Digital UPM (121.743 recursos)

This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Telecomunicaciones

Mostrando recursos 1 - 20 de 523

  1. Proyecto CITIZ@MOVE. Informe final de los trabajos realizados por la Universidad Politécnica de Madrid

    Hojas Hojas, Luis Ignacio
    El Ayuntamiento de Sevilla lidera un proyecto de la Iniciativa UrbACT para la participación ciudadana. Nuestro grupo de trabajo desarrolla una plataforma para la participación activa de los ciudadanos en la red Europea UrbACT Citiz@Move. El convenio se firma con Oficina de Transferencia de Tecnología (OTT) de la UPM con el número P-065815201

  2. Proyecto Toledo Telecomunicaciones (TOTEL) : Informe final

    Hojas Hojas, Luis Ignacio
    Informe Final del Proyecto Toledo Telecomunicaciones de la Iniciativa ADAPT II (1998-2000) financiada por el Fondo Social Europeo. El documento describe las actividades realizadas en el proyecto.

  3. Bética Telecomunicaciones (BETEL) : [Informe final del proyecto]

    Hojas Hojas, Luis Ignacio
    Informe final del proyecto Europeo denominado Béticqa Telecomunicaciones (BETEL). Este proyecto fue una propuesta competitiva presentada al Fondo Social Europeo Iniciativa ADAPT II (1998-2000) y orientado a la difusión de las tecnologías de comunicaciones basadas en Internet. El Informe describe las actividades realizadas en el proyecto.

  4. Análisis de la eficiencia de transferencia inalámbrica de energía en la banda NFC

    Herrero Sebastián, Iván
    El rápido crecimiento en el uso de dispositivos móviles ha hecho que aparezca un nuevo problema en la sociedad moderna: La duración de las baterías y la carga de las mismas. A esto hay que añadir que, cada vez más, los usuarios reclaman soluciones lo más prácticas y cómodas posibles, como la eliminación de los cables. El objetivo de este trabajo ha sido realizar un estudio sobre la transferencia inalámbrica de energía entre antenas en la frecuencia libre de NFC. Para ello, previamente, se han diseñado un conjunto de antenas que funcionan en dicha banda, mediante un análisis de sus parámetros...

  5. Reduced basis approximations in microwave filters and diplexers: Inf-sup constant behavior

    García Salgado, Sara; Rubia Hernández, Valentin de la; Mrozowski, Michal
    In this work, a model order reduction technique for fast frequency sweep in microwave filters and diplexers via the Reduced Basis Method is detailed. The Finite Element Method is used to solve the time-harmonic Maxwell's equations in these resonant circuit problems. Taking into account the electromagnetic field varies smoothly as a function of the frequency parameter, a low dimension system parameter manifold is identified. Thus, the original frequency-dependent Finite Element problem can be approximated by a model of reduced size using a Reduced Basis approximation. Based on the field frequency behavior in these resonant structures, the Reduced Basis space where...

  6. Loewner matrix approach for circuit modelling in FEM analysis of microwave filters

    Young, David; Rubia Hernández, Valentín de la
    A circuit description of the electromagnetic behavior in microwave filters by means of the data provided by FEM analysis in the frequency band of interest is detailed. Loewner matrix approach is used to carry out a tangential interpolation of the simulation data, giving rise to a linear dynamical system description fitting the simulation results. The FEM solver is then used as a black box unlike other model-order reduction techniques. As a result, from this linear dynamical system, a transversal coupling matrix gathering all electromagnetic phenomena within a frequency band is found.

  7. Desempeño de los sistemas MU-MIMO basados en la GMD con precodificación Tomlinson-Harashima (THP)

    Allán Ibarra, David Alejandro
    El uso de la GMD (Descomposición en Media Geométrica) sobre la matriz del canal MIMO (Multiple Entrada/Multiple Salida) y la implementación de técnicas DPC (Precodificación Costa), permite descomponer el canal en múltiples subcanales SISO (Simple Entrada/Simple Salida) con igual SNRs, habilitando para que el mismo MCS (Esquema de Modulación y Codificación) sea desplegado en todas las capas activas del sistema. Este trabajo de Fin de Master analiza el comportamiento de la BER (Tasa de Error de Bit) y la sum-rate que alcanzan los sistemas MU-MIMO (MIMO Multiusuario) basados en la GMD y que hacen uso de la THP (Precodificación Tomlinson-Harashima)...

  8. Influence of typical railway objects in mmWave propagation channel

    He, Danping; Bo, Ai; Guan, Ke; Moreno García-Loygorri, Juan; Li, Tian; Zhong, Zhangdui; Hrovat, Andrej
    In the future railway services, wireless communication is the fundamental part and millimeter wave (mmWave) is foreseen to be a key enabler towards the smart railway. An accurate understanding of the propagation environment can assist designing both systems and railway infrastructures for better communication services. In this paper, the influence of typical objects to the mmWave propagation channel are analyzed for ?Train-to-infrastructure? and ?Intra-wagon? railway scenarios with various configurations. Propagation measurements are conducted in the mmWave band for the 12 most common railway materials. The corresponding electromagnetic parameters are obtained and a 3D ray tracing (RT) simulator is calibrated. The...

  9. Traffic estimation for dynamic capacity adaptation in load adaptive network operation regimes

    Ahrens, Andreas; Lange, Christoph; Benavente Peces, César
    The energy demand of telecommunication equipment and networks has been identified to be significant. In the information society such networks are vital for societal and economic welfare as well as for the people’s private lives. Therefore an improved energy efficiency of telecommunication networks is essential in the context of sustainability and climate change. Load-adaptive regimes are a promising option for energy-efficient and sustainable network operation. As the capacity is adapted to temporally fluctuating traffic demands, they require a robust traffic demand estimation. As a potential solution to mitigate this problem, a method for reliable traffic demand forecasting on relevant time scales using...

  10. Context-aware prediction of access points demand in Wi-Fi networks

    Rodríguez-Lozano, David; Gómez-Pulido, Juan A.; Lanza-Gutiérrez, José M.; Durán-Domínguez, Arturo
    We present a methodology based on matrix factorization and gradient descent to predict the number of sessions established in the access points of a Wi-Fi network according to the users’ behavior. As the network considered in this work is monitored and controlled by software in order to manage users and resources in real time, we may consider it as a cyber-physical system that interacts with the physical world through access points, whose demands can be predicted according to users’ activity. These predictions are useful for relocating or reinforcing some access points according to the changing physical environment. In this work...

  11. First results of total attenuation distributions and fade dynamics from the Alphasat propagation experiment in Madrid

    Pimienta del Valle, Domingo; Benarroch Vila, Ana; Riera Salis, José Manuel; García del Pino, Pedro
    Abstract: Experimental results in satellite propagation on millimeter-wave band have an important role in the development of propagation channel models for these frequencies. Two full years of measurements of the Q-band beacon from the Alphasat satellite are available in Madrid, Spain, as part of a propagation study carried out by Universidad Politécnica de Madrid. In this paper, the main objective is to present the first results of these two years, specifically total attenuation distributions and fade dynamics. Results of fade dynamics are compared with prediction models. Experiment characteristics and data processing details are also presented. When compared with the results of...

  12. Semantic Filtering for Video Stabilization

    Karageorgos, K.; Dimou, A.; Axenopoulos, A.; Daras, P.; Álvarez García, Federico
    Moving objects pose a challenge to every video stabilization algorithm. We present a novel, efficient filtering technique that manages to remove outlier motion vectors caused from moving objects in a per-pixel smoothing setting. We leverage semantic information to change the calculation of optical flow, forcing the outliers to reside in the edges of our semantic mask. After a `content-preserving warping' and a smoothing step we manage to produce stable and artifact-free videos.

  13. Prone to supine surface-based registration for surgical planning in breast cancer treatment

    Alfano, Felicia; Pérez García, F.; Ortuño Fisac, Juan Enrique; Herrero Conde, Mercedes; Bueno Zamora, O.; Calvo, Felipe A.; Lizarraga, Serafín; Santos Lleo, Andrés; Pascau González-Garzón, Javier; Ledesma Carbayo, María Jesús
    Breast cancer is the most common invasive cancer in women worldwide. Many women with breast cancer have their malignant tumors detected before the lesions become clinically palpable. Occult lesions must be marked for the surgeon to ensure that they can be effectively resected. Image-guided wire localization (WGL) is the current standard of care for the excision of non-palpable carcinomas during breast conserving surgery. The integration of the information from multimodal imaging may be especially relevant in surgical planning as complement or an alternative to WGL. The combination of information from images in different positions is especially difficult due to large...

  14. Regeneración de campus para la creación de un laboratorio vivo de sostenibilidad ("living lab") en el Campus de Excelencia Internacional de Moncloa

    Mataix Aldeanueva, Carlos; Romero Muñoz, Sara; Moreno Serna, Jaime; Sánchez Reséndiz, Jorge Adán; Pesternikova, Elizaveta; Zamora Riesco, R.; Sobrino, F.; Olivieri, Francesca; Briz Escribano, Julian; Masaguer Rodríguez, Alberto; Gutiérrez, A.; Sicilia, J.; Soberón Mas, Miguel Ángel; Ramil, X.; De Felipe, I.; Rodríguez, L.; Borrella Alonso de la Torre, María Inmaculada; Moral, M. del; Sierra Castañer, Manuel; Lumbreras Martin, Julio; Caamaño Martín, Estefanía; Pereira Jerez, David; De la Sota Sández, Candela; Hernández, C.G.; Cianci, A.
    La Universidad Politécnica de Madrid (UPM) a través de su Centro de Innovación en Tecnología para el Desarrollo Humano (itdUPM) está propiciando la generación de conciencia, conocimiento y soluciones innovadoras que contribuyen al cumplimiento de los Objetivos de Desarrollo Sostenible a través de un edificio que sirve como laboratorio de prueba para nuevas tecnologías verdes y como plataforma de ideación colaborativa y activación social.

  15. Subjective assessment of super multiview video with coding artifacts

    Recio Nogales, Rocío; Carballeira López, Pablo; Gutierrez Sanchez, Jesus; García Santos, Narciso
    The subjective assessment of super multiview (SMV) video considers two main perceptual factors: image quality and visual comfort at the viewpoint transition. While previous works only covered raw content with high levels of visual comfort, this work supersedes them by targeting the subjective assessment of SMV content with coding artifacts. The outcome of this analysis yields important conclusions regarding the relationship between these two factors, indicating that 1) the perceived image quality is independent from the view point change speed, and 2) the perceived visual comfort at the view point transition is independent from the image quality. These conclusions facilitate...

  16. Detection of anomalies in surveillance scenarios using mixture models

    Tomé Alonso, Adrián; Salgado Álvarez de Sotomayor, Luis
    In this paper we present a robust and simple method for the detection of anomalies in surveillance scenarios. We use a “bottom-up” approach that avoids any object tracking, making the system suitable for anomaly detection in crowds. A robust optical flow method is used for the extraction of accurate spatio-temporal motion information, which allows to get simple but discriminative descriptors that are employed to train a Gaussian mixture model. We evaluate our system in a publicly available dataset, concluding that our method outperforms similar anomaly detection approaches but with a simpler model and low-sized descriptors.

  17. MultiView perceptual disparity model for super multiView video

    Carballeira López, Pablo; Gutiérrez Sánchez, Jesús; Morán Burgos, Francisco; Cabrera Quesada, Julian; Jaureguizar Núñez, Fernando; García Santos, Narciso
    Super MultiView (SMV) video display is the most promising technology for 3-D glasses-free visualization. Although only a few prototypes are currently available, the research on tech- nical and perceptual factors related to this approach is crucial. This paper presents a novel model to capture the subjective per- ception of SMV, called the MultiView Perceptual Disparity Model (MVPDM), by means of a parametrization of the relation between: 1) capture and scene settings, and 2) perception of speed comfort and smoothness in the viewpoint transition. The MVPDM is based on a novel parameter: the perceptual disparity, that captures ap- propriately the perceptual...

  18. Application-layer FEC scheme configuration optimization via hybrid simulated annealing

    Díaz Martín, César; Cabrera Quesada, Julian; Jaureguizar Nuñez, Fernando; García Santos, Narciso
    An optimization technique based on an adapted combination of simulated annealing (SA) and tabu search (TS) is presented. This method aims at finding near-optimal unequal error protection (UEP) application-layer FEC code configurations. This approach is intended to smartly protect audio and video transmission over IP networks when hard time restrictions apply. The considered code is a UEP version of the widely-used Pro-MPEG COP3 codes enabling the use of several matrices of dissimilar size and thus of unequal recovery capability. Finding the optimal configuration frequently requires the evaluation of a large solution space. So, to fulfill the imposed constraints, SA is...

  19. Detecting exercise-induced fatigue using thermal imaging and deep learning

    Bordallo López, Miguel; Blanco Adán, Carlos Roberto del; García Santos, Narciso
    Fatigue has adverse effects in both physical and cognitive abilities. Hence, automatically detecting exercise-induced fatigue is of importance, especially in order to assist in the planning of effort and resting during exercise sessions. Thermal imaging and facial analysis provide a mean to detect changes in the human body unobtrusively and in variant conditions of pose and illumination. In this context, this paper proposes the automatic detection of exercise-induced fatigue using thermal cameras and facial images, analyzing them using deep convolutional neural networks. Our results indicate that classification of fatigued individuals is possible, obtaining an accuracy that reaches over 80% when...

  20. Detection of stationary foreground objects using multiple nonparametric background-foreground models on a finite state machine

    Cuevas Rodríguez, Carlos; Martínez Sanz, Raquel; Berjón Díez, Daniel; García Santos, Narciso
    There is a huge proliferation of surveillance systems that require strategies for detecting different kinds of stationary foreground objects (e.g., unattended packages or illegally parked vehicles). As these strategies must be able to detect foreground objects remaining static in crowd scenarios, regardless of how long they have not been moving, several algorithms for detecting different kinds of such foreground objects have been developed over the last decades. This paper presents an efficient and highquality strategy to detect stationary foreground objects, which is able to detect not only completely static objects but also partially static ones. Three parallel nonparametric detectors with...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.