Now showing items 101-120 of 353
Nadal Reixats, Laia (Date of defense: 2014-11-21)
Due to the increasing global IP traffic and the exponential growing demand for broadband services, optical networks are experimenting significant changes. Advanced modulation formats are being implemented at the Digital ...
Sarmiento Hernández, Samael (Date of defense: 2020-03-26)
The Internet data traffic constant growth caused by the popularization of cloud services, mobile and social networks, demand changes to the networks in order to enable scalable growth in traffic volume, while supporting a ...
Pascual Biosca, Daniel (Date of defense: 2020-12-21)
GNSS reflectometry (GNSS-R) is a set of techniques that uses the reflected GNSS signals over the Earth’s surface as opportunity signals for remote sensing applications. In 1993, the European Space Agency (ESA) suggested ...
Imbert Villà, Marc (Date of defense: 2016-07-29)
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 ...
Mekikis, Prodromos-Vasileios (Date of defense: 2017-11-13)
Undeniably, the progress in wireless networks during the last two decades is extraordinary. However, the ever-increasing upward trend in the numbers of wireless devices that will overwhelm every field of our everyday life, ...
Niotaki, Kyriaki (Date of defense: 2014-12-15)
In the future communication systems, it is of key importance that the transceivers are capable of operating in multiple frequency bands and with complex signals. In this context, the power amplifier is a critical component ...
Bousia, Alexandra (Date of defense: 2016-02-18)
The rapid expansion of mobile services and the emerging demand for multimedia applications have led to an impressive traffic growth. To this end, Mobile Network Operators (MNOs) seek to extend their infrastructure by ...
Díaz Tapia, Edgar (Date of defense: 2013-10-28)
The advances in the communications systems has brought new requirements and challenges in terms of compactness and efficient systems that looking for increase the signal coverage area. The reconfigurable antennas are a ...
Ibarra Fusté, José Antonio (Date of defense: 2014-02-03)
Electro-optical traveling wave modulators (EO-TWM) are basic building blocks of the optical communications industry which is leading a revolution in the way we communicate, work and live. As a result, the demand for ...
Zelenák, Martin (Date of defense: 2012-01-31)
For the last several years, speaker diarization has been attracting substantial research attention as one of the spoken language technologies applied for the improvement, or enrichment, of recording transcriptions. ...
Muñoz Martin, Joan Francesc (Date of defense: 2021-06-17)
Earth Observation using satellites has helped to better model our planet. The goal of such systems is to provide large data sets to help to understand the effects of our actions on the climate, to predict storms in near ...
Font Bach, Josep Oriol (Date of defense: 2013-07-26)
The goal of this Ph.D. dissertation is to address a number of challenges encountered in the digital baseband design of modern and future wireless communication systems. The fast and continuous evolution of wireless ...
Zewoudie, Abraham Woubie (Date of defense: 2017-09-20)
Speaker diarization has received several research attentions over the last decade. Among the different domains of speaker diarization, diarization in meeting domain is the most challenging one. It usually contains spontaneous ...
Pradell, Lluís (Date of defense: 1989-11-16)
Sin tener en cuenta introducción y conclusiones, la tesis doctoral esta dividida en 6 capítulos. Los dos primeros tratan del ruido eléctrico asociado a los dispositivos activos (transistores Gaas Fet y Hemt) utilizados en ...
Brezmes Llecha, Jesús (Date of defense: 2001-12-11)
La monitorización del grado de maduración es un tema de gran relevancia en la industria frutícola. En esta tesis doctoral se ha estudiado la viabilidad de utilizar una nariz electrónica como instrumento para monitorizar ...
Játiva Espinoza, René (Date of defense: 2017-04-06)
Mobile subscriber positioning is an issue in permanent revision due to the new possibilities of relation that the knowledge of the position introduces, among users and an increasing number of devices. This problem is boarded ...
Espinosa Espinosa, Moisés Isaac (Date of defense: 2015-11-23)
This thesis presents reconfigurable microwave discriminators used for the development of reconfigurable measurement circuits with high miniaturization, low power consumption, reduced weight and cost. The concept is ...
Silva Pereira, Silvana (Date of defense: 2012-01-26)
Wireless sensor networks are developed to monitor areas of interest with the purpose of estimating physical parameters or/and detecting emergency events in a variety of military and civil applications. A wireless sensor ...
Atzeni, Italo (Date of defense: 2014-07-08)
The modern power grid is facing major challenges in the transition to a low-carbon energy sector. The growing energy demand and environmental concerns require carefully revisiting how electricity is generated, transmitted, ...
Pons Freixes, Sergi (Date of defense: 2016-01-28)
Water is the most important resource for living on planet Earth, covering more than 70% of its surface. The oceans represent more than 97% of the planet total water and they are where more than the 99.5% of the living ...