Now showing items 139-158 of 345

    Face recognition by means of advanced contributions in machine learning 

    Espinosa Duró, Virginia (Date of defense: 2013-06-14)

    Face recognition (FR) has been extensively studied, due to both scientific fundamental challenges and current and potential applications where human identification is needed. FR systems have the benefits of their non ...

    Fairness Analysis of Wireless Beamforming Schedulers 

    Bartolomé Calvo, Diego (Date of defense: 2005-01-12)

    Aquesta tesi es dedica a l'anàlisi de la justícia a la capa física en entorns de comunicacions amb múltiples antenes i diversos usuaris, cosa que implica un nou punt de vista sobre problemas tradicionals. Malgrat això, el ...

    Feature selection for multimodal: acoustic event detection 

    Butko, Taras (Date of defense: 2011-07-08)

    The detection of the Acoustic Events (AEs) naturally produced in a meeting room may help to describe the human and social activity. The automatic description of interactions between humans and environment can be useful for ...

    Feedback of channel state information in multi-antenna systems based on quantization of channel Gram matrices 

    Sacristán Murga, Daniel Francisco (Date of defense: 2012-07-19)

    This dissertation deals with the proper design of efficient feedback strategies for Multiple-Input Multiple-Output (MIMO) communication systems. MIMO systems outperform single antenna systems in terms of achievable throughput ...

    Feedback-Channel and adaptative mimo coded-modulations. 

    Rey Micolau, Francesc (Date of defense: 2006-05-12)

    (Català) En els sistemes de comunicacions on el transmissor disposa de certa informació sobre l'estat del canal (CSI), es possible dissenyar esquemes lineals de precodificació que assignin la potència de manera òptima ...

    Formulación espectral de la radiación: aplicación al caso cilíndrico 

    Romeu Robert, Jordi (Date of defense: 1991-07-08)

    Formulación espectral de la radiación en coordenadas cartesianas, cilíndricas y esféricas. Aplicación de la formulación a problemas de diagnostico de antenas, análisis del efecto de radomos y transformación campo próximo ...

    Fractal antennas 

    Puente Baliarda, Carles (Date of defense: 1997-06-30)

    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 ...

    From hypothesis testing of quantum channels to secret sharing 

    Salek Shishavan, Farzin (Date of defense: 2020-12-14)

    The present thesis has three major thrusts: the first thrust presents a broad investigation of asymptotic binary hypothesis testing, when each hypothesis represents asymptotically many independent instances of a quantum ...

    Fusing prosodic and acoustic information for speaker recognition 

    Farrús Cabeceran, Mireia (Date of defense: 2008-10-29)

    El reconeixement automàtic del locutor és la utilització d’una màquina per identificar un individu a partir de d’un missatge parlat. Recentment, aquesta tecnologia ha experimentat un increment en l’ús de diverses aplicacions ...

    Gender bias in natural language processing 

    Basta, Christine Raouf Saad (Date of defense: 2022-10-14)

    (English) Gender bias is a dangerous form of social bias impacting an essential group of people. The effect of gender bias is propagated to our data, causing the accuracy of the predictions in models to be different depending ...

    Generalized consistent estimation in arbitrarily high dimensional signal processing 

    Rubio Molina-Prados, Francisco E. (Date of defense: 2008-06-13)

    La teoría del procesado estadístico de la señal halla un amplio abanico de aplicaciones en los campos de las comunicaciones de datos, así como también en el procesado con agrupaciones de sensores. Ciertamente, un gran ...

    Geosynchronous synthetic aperture radar for Earth continuous observation missions 

    Ruiz Rodon, Josep (Date of defense: 2014-11-20)

    This thesis belongs to the field of remote sensing, particularly Synthetic Aperture Radar (SAR) systems from the space. These systems acquire the signals along the orbital track of one or more satellites where the transmitter ...

    GMPLS-based provisioning of ethernet connections over WSON with quality of service 

    Bukva, Anica (Date of defense: 2012-12-10)

    The rapid growth of the data traffic, caused by the ever-growing number of Internet users and the services requiring huge bandwidth (e.g., videoconferences, IPTV, etc.) show that the existing transport network infrastructure ...

    GNSS array-based acquisition: theory and implementation 

    Arribas Lázaro, Javier (Date of defense: 2012-06-28)

    This Dissertation addresses the signal acquisition problem using antenna arrays in the general framework of Global Navigation Satellite Systems (GNSS) receivers. The term GNSS classi es those navigation systems based on a ...

    GNSS reflectometry for land remote sensing applications 

    Egido Egido, Alejandro (Date of defense: 2013-07-05)

    Soil moisture and vegetation biomass are two essential parameters from a scienti c and economical point of view. On one hand, they are key for the understanding of the hydrological and carbon cycle. On the other hand, soil ...

    GNSS Signal processing and spatial diversity exploitation 

    García Molina, José Antonio (Date of defense: 2020-02-14)

    Global Navigation Satellite Systems (GNSS) signals are broadly used for positioning, navigation and timing (PNT) in many different applications and use cases, Athough different PNT technologies are available, GNSS is ...

    GNSS-R as a source of opportunity for remote sensing of the cryosphere 

    Fabra Cervellera, Francisco (Date of defense: 2013-05-13)

    This work evaluates the potential use of signals from the Global Navigation Satellite Systems (GNSS) that scatter off the Earth surface for the retrieval of geophysical information from the cryosphere. For this purpose, ...

    Graph convolutional neural networks for 3D data analysis 

    Mosella Montoro, Albert (Date of defense: 2023-02-22)

    (English) Deep Learning allows the extraction of complex features directly from raw input data, eliminating the need for hand-crafted features from the classical Machine Learning pipeline. This new paradigm brought a boost ...

    Graph-based techniques for compression and reconstruction of sparse sources 

    Ramírez Jávega, Francisco (Date of defense: 2016-01-20)

    The main goal of this thesis is to develop lossless compression schemes for analog and binary sources. All the considered compression schemes have as common feature that the encoder can be represented by a graph, so they ...

    Grapheme-to-phoneme conversion in the era of globalization 

    Polyàkova, Tatyana V. (Date of defense: 2015-03-13)

    This thesis focuses on the phonetic transcription in the framework of text-to-speech conversion, especially on improving adaptability, reliability and multilingual support in the phonetic module. The language is constantly ...