Departament de Teoria del Senyal i Comunicacions: Envíos recientes
Mostrando ítems 121-140 de 355
Large vocabulary continuous speech recognition for the transcription of Catalan broadcast news and conversations : towards analysis and modelling of acoustic reduction in spontaneous speech
The transcription of spontaneous speech still poses a challenge to state-of-the-art methods for automatic speech recognition. The present thesis describes the comprehensive development of a large vocabulary continuous ...
Robust indoor positioning in WLAN networks
Navigation and location technologies have been reaching in a major interest where Global Navigation Satellite System (GNSS) is mostly adopted. The limitation of this technology is that direct sky view is needed for reliable ...
Orbital differential SAR interferometry with polarimetric data
Space-borne Synthetic Aperture Radar (SAR) systems have demonstrated great effectiveness to survey wide areas, independently of the weather conditions and the day/night cycle. One of the most exploited applications is ...
Coordination strategies for interference management in MIMO dense cellular networks
The envisioned rapid and exponential increase of wireless data traffic demand in the next years imposes rethinking current cellular networks due to the available spectrum scarcity. In this regard, 3 main drivers are ...
Region-based particle filter leveraged with a hierarchical co-clustering
In this thesis, we exploit the hierarchical information associated with images to tackle two fundamental problems of computer vision: video object segmentation and video segmentation. In the first part of the thesis, we ...
Energy-aware service provisioning in P2P-assisted cloud ecosystems
Energy has been emerged as a first-class computing resource in modern systems. The trend has primarily led to the strong focus on reducing the energy consumption of data centers, coupled with the growing awareness of the ...
Shrinkage corrections of sample linear estimators in the small sample size regime
We are living in a data deluge era where the dimensionality of the data gathered by inexpensive sensors is growing at a fast pace, whereas the availability of independent samples of the observed data is limited. Thus, ...
Contributions to land, sea, and sea ice remote sensing using GNSS-reflectometry
This PhD thesis researches the use of passive remote sensing techniques using signals transmitted from the navigation satellites (GNSS) in order to retrieve different geophysical parameters. The thesis consists of two ...
Earth remote sensing with SMOS, Aquarius and SMAP missions
The first three of a series of new generation satellites operating at L-band microwave frequencies have been launch in the last decade. L-band is particularly sensitive to the presence of water content in the scene under ...
Self organisation for 4G/5G networks
Nowadays, the rapid growth of mobile communications is changing the world towards a fully connected society. Current 4G networks account for almost half of total mobile traffic, and in the forthcoming years, the overall ...
Simulation, detection, and classification of vessels in maritime SAR images
Over the last decades, environmental and socio-economic factors have generated interest on the observation of the ocean. Thus, the monitoring of maritime human activity has become crucial for the protection of the marine ...
Ocean surface currents reconstruction from microwave radiometers measurements
Ocean currents are a key component to understanding many oceanic and climatic phenomena and knowledge of them is crucial for both navigation and operational applications. Therefore, a key problem in oceanography is the ...
Fractal antennas
Las antenas son dispositivos esencialmente de banda estrecha; es decir, su comportamiento es altamente dependiente de la frecuencia de operación. La relación entre la longitud de onda de trabajo y el tamaño de la antena ...
Visual object analysis using regions and local features
The first part of this dissertation focuses on an analysis of the spatial context in semantic image segmentation. First, we review how spatial context has been tackled in the literature by local features and spatial ...
Towards zero-power wireless machine-to-machine networks
This thesis aims at contributing to overcome two of the main challenges for the deployment of M2M networks in data collection scenarios for the Internet of Things: the management of massive numbers of end-devices that ...
Privacy-preserving energy management techniques and delay-sensitive transmission strategies for smart grids
The smart grid (SG) is the enhancement of the traditional electricity grid that allows bidirectional flow of electricity and information through the integration of advanced monitoring, communication and control technologies. ...
Automatic analysis of the acoustic environment of a preterm infant in a neonatal intensive care unit
Most preterm newborns must be admitted to a Neonatal Intensive Care Unit (NICU) where they receive a specialized medical care, what, in many cases, is crucial for their survival. The acoustic environment of a typical NICU ...
On the design of high-efficiency RF Doherty power amplifiers
Power amplifiers (PAs) are one of the most crucial elements in wireless standards becasue they are the most power hungry subsystems. These elements have to face an important issue, which is the power efficiency, a fact ...
Towards a cloud enabler : from an optical network resource provisioning system to a generalized architecture for dynamic infrastructure services provisioning
This work was developed during a period where most of the optical management and provisioning system where manual and proprietary. This work contributed to the evolution of the state of the art of optical networks with new ...
Design and performance evaluation of millimeter-wave flat lens antennas for communications, radar and imaging applications
Millimeter-wave systems introduce a set of particular severe requirements from the antenna point of view in order to achieve specific performances. In this sense, high directive antennas are required to overcome the huge ...
