Browsing Universitat Politècnica de Catalunya by Title

Contributions to the routing of traffic flows in multi-hop IEEE 802.11 wireless networks

Catalán Cid, Miguel (Date of defense: 2016-02-10)

The IEEE 802.11 standard was not initially designed to provide multi-hop capabilities. Therefore, providing a proper traffic performance in Multi-Hop IEEE 802.11 Wireless Networks (MIWNs) becomes a significant challenge. ...

Contributions to the security of cognitive radio networks

León Abarca, Olga (Date of defense: 2012-01-31)

The increasing emergence of wireless applications along with the static spectrum allocation followed by regulatory bodies has led to a high inefficiency in spectrum usage, and the lack of spectrum for new services. In this ...

Contributions to TOA-based location with wlan

Ciurana Adell, Marc (Date of defense: 2010-07-15)

Location techniques that satisfy the requirements of advanced Location-Based Services (LBS) in environments where GPS fails are needed, therefore accurate indoor positioning is becoming increasingly important. This PhD ...

Contributions to topology discovery, self-healing and VNF placement in software-defined and virtualized networks

Ochoa Aday, Leonardo (Date of defense: 2019-01-30)

The evolution of information and communication technologies (e.g. cloud computing, the Internet of Things (IoT) and 5G, among others) has enabled a large market of applications and network services for a massive number of ...

Contributions towards softwarization and energy saving in passive optical networks

Khalili, Hamzeh (Date of defense: 2018-09-20)

Ths thesis is a result of contributions to optimize and improve the network management systme and power consumption in Passive Optical Network (PON). Passive Optical Network elements such as Optical Line Terminal (OLT) and ...

Contributrion to the improvement of the soil moisture and ocean salinity (SMOS) sea surface salinity retrieval algorithm

Talone, Marco (Date of defense: 2010-11-22)

The European Space Agency's Soil Moisture and Ocean Salinity (SMOS) satellite was launched on November, 2, 2009 from the Russian cosmodrome of Plesetsk. Its objective is to globally and regularly collect measurements ...

Control activo de ruido de baja frecuencia de maquinaria industrial en un campo de baja densidad modal, mediante el encapsulado de sus fuentes de ruido

Salueña Berna, Xavier (Date of defense: 2013-09-30)

Normally, there are in use certain technologies of reduction of noise named passive, in the cancellation of the noise produced by industrial machinery. These technologies can be applied directly on the source (use of ...

Control adaptativo por modelo de referencia con síntesis de controlador mínima en sistemas con incertidumbre y sujetos a perturbaciones

Larco Barros, Ciro Mauricio (Date of defense: 2021-12-15)

In this research work, a non-linear technique called Minimum Controller Synthesis (MCS) is presented. This is a variant of the Model Reference Adaptive Control (MRAC), which has the main advantage of requiring very little ...

Control and design of pem fuel cell-based systems

Feroldi, Diego Hernán (Date of defense: 2009-05-19)

Las pilas de combustible son muy ventajosas debido a su alta eficiencia en la conversión de energía y nula contaminación. En esta tesis se realiza un extenso estudio sobre el control y diseño de sistemas de generación ...

Control and management of energy storage systems in microgrids

Unnikrishnan Raveendran, Nair (Date of defense: 2020-07-23)

The rate of integration of the renewable energy sources in modern grids have significantly increased in the last decade. These intermittent, non-dispatchable renewable sources, though environment friendly tend to be ...

Control and modulation of modular multilevel converters

Picas Prat, Ricard (Date of defense: 2016-12-22)

The integration of renewable energy sources in the electrical grid is reducing our dependence on fossil fuels. However, to ensure feasibility and reliability of distributed energy generation, more efficient and higher power ...

Control and operation of multi-terminal VSC-DC networks

Gavriluţă, Cătălin (Date of defense: 2015-03-04)

For the past century, ac networks have been established as the standard technology for electrical power transmission system s. However, the de technology has not disappeared completely from this picture. The capability of ...

Control and operation of wind power plants connected to DC grids

Schönleber, Kevin (Date of defense: 2018-02-09)

Remote offshore wind power plants (WPPs) are being linked through high-voltage de voltage-source converter (VSC-HVdc) transmission to the main grids. The current deployments of HVdc grid connections for offshore WPPs are ...

Control contributions to AC microgrid inverters

Heredero Peris, Daniel (Date of defense: 2017-03-24)

This thesis is focused on the microgrid control framework. Specifically, it is concentrated on alternative current microgrids. As a result of the author involvement in different industrial projects concerning microgrids ...

Control de congestión multipunto en redes IP y ATM. Diseño de protocolos de transporte multipunto fiable

Solera Delgado, Marta (Date of defense: 2006-11-13)

Las comunicaciones multipunto ofrecen, tanto a usuarios como a proveedores, mayor eficiencia, permitiendo desarrollar e implantar nuevos servicios. Para poder desplegarlos adecuadamente sobre la redes de comunicaciones, ...

Control de convertidores trifásicos mediante imposición de dinámica y estimadores

Guzmán Solà, Ramon (Date of defense: 2016-10-14)

The present thesis is focused on the control of three-phase power converters using sliding-mode control (SMC) in abc frame. This work has been based on previous publications about the SMC applied to three-phase power ...

Control de tráfico aéreo y marítimo. Identificación de idiosincrasias y aportaciones al contexto de la seguridad marítima

Marí Sagarra, Francisco (Date of defense: 2000-06-27)

Comparación técnica de la operatividad entre los servicios de control de tráfico aéreo y marítimo, a fin de identificar las ventajas y disfunciones de cada uno y de ambos conjuntamente. <br/>Analizar las interacciones que ...