The mobile communications role in next generation networks: The case of Spain

Next generation access networks (NGAN) will support a renewed electronic communication market where main opportunities lie in the provision of ubiquitous broadband connectivity, applications and content. From their deployment it is - much - expected a wealth of innovations. Within this framework this paper reviews the technical architecture of a mobile network as a candidate for a NGAN deployment, derives a simple method for approcimate cost calculations, and then discusses the results obtained. Data for Spain are used for practical calculations, but the model is applicable with minor modivications to most ot the EU countries. The final part of the paper is devoted to reflect on the technical and economic feasibility of mobile communications as part of NGAN, as well as the adequacy and possible development of the current regulatory framework. --LTE,4G,Mobile communications,Next Generation Networks,Spain

Programación lineal binaria para la planificación de sistemas inalámbricos

Locating access points for Wi-Fi networks in a post-pandemic scenario proposes an application in the planning and restructuring of existing wireless systems. Education strategies such as the flipped classroom, among others, demand the overall performance of the system. In this work, we propose a methodology using binary linear programming as a strategy to achieve the planning of a Wi-Fi system that can have the objectives of coverage, user capacity and channel interference. The results show a better coverage, higher speed per user and optimized the amount of equipment per sector in the laboratories of the University of Magdalena.La localización de puntos de acceso para redes Wi-Fi en un escenario postpandemia propone una aplicación en la planificación y reestructuración de los sistemas inalámbricos existentes. Las estrategias educativas como el aula invertida, entre otras, exigen el desempeño integral del sistema. En este trabajo se propone una metodología utilizando programación lineal binaria como estrategia para lograr la planificación de un sistema Wi-Fi que pueda tener los objetivos de cobertura, capacidad de usuarios e interferencia de canales. Los resultados muestran una mejor cobertura, mayor velocidad por usuario y una cantidad optimizada de equipos por sector en los laboratorios de la Universidad del Magdalena

The mobile communications role in next generation networks: The case of Spain

Next generation access networks (NGAN) will support a renewed electronic communication market where main opportunities lie in the provision of ubiquitous broadband connectivity, applications and content. From their deployment it is - much - expected a wealth of innovations. Within this framework this paper reviews the technical architecture of a mobile network as a candidate for a NGAN deployment, derives a simple method for approcimate cost calculations, and then discusses the results obtained. Data for Spain are used for practical calculations, but the model is applicable with minor modivications to most ot the EU countries. The final part of the paper is devoted to reflect on the technical and economic feasibility of mobile communications as part of NGAN, as well as the adequacy and possible development of the current regulatory framework

A comparison of residual demand models for oligopolistic markets

15th Power Systems Computation Conference August 22-26, 2005 Liège, BelgiumIn many pool-based electricity markets two types of generating companies coexist, namely price-taking and leader companies. In this context, the optimal bidding of a leader company, and consequently the market clearing price, is mainly determined by its residual demand curve, which can be modeled in different ways. In this work, three different residual demand curves have been adopted to simulate the optimal strategy of an oligopolistic company. The influence of these models on the gap between the expected and actual market prices, as well as on the resulting leader company profit is analyzed.Ministerio de Ciencia y Tecnología DPI2001-2612Junta de Andalucía ACC-1021-TIC20

Sistema adaptativo de cancelación de ruido usando filtros de mínimos cuadrados

In this paper, we show an Adaptive Noise Canceller (ANC) that estimate an original audio a signal measured with noise. Adaptive system is implemented using a Recursive Least Squares filter (RLS). Its design parameters consider the filter order, forgetting factor and initial conditions to obtain optimal coefficients through iterations. A medium square error (MSE) around to 10-6  is reached, and with this it makes possible a low-cost implementation.En este artículo, se presenta el diseño de un sistema adaptativo de cancelación de ruido, en el cual se estima una señal medida con ruido. Se implementa este sistema adaptativo utilizando un filtro de mínimos cuadrados (RLS). Este diseño considera parámetros tales como el orden del filtro, factor de olvido y condiciones iniciales para obtener los coeficientes óptimos del filtro a través de iteraciones. Se logró un error cuadrático medio alrededor de 10-6 , y con esto es posible hacer una implementación de bajo costo

Explotación del recurso bidireccional de canal inalámbrico aplicado a conferencias traducidas

Este artículo presenta una solución tecnológica propuesta para una deficiencia identificada en los sistemas de telecomunicaciones empleados para la realización de conferencias en las cuales el ponente y el auditorio difieren en idioma de habla. La propuesta está enfocada a satisfacer la necesidad al momento de realizar intervenciones por parte del auditorio, mediante la implementación de un sistema inalámbrico en modo de transmisión full-dúplex, y de una central de traducción y moderamiento con el fin de lograr una comunicación más efectiva entre el ponente y el auditorio, que la comunicación lograda con los dispositivos inalámbricos en modo de transmisión unidireccional que actualmente se conocen para este tipo de aplicaciones.Palabras clave: ZigBee, radiocomunicación, Frecuencia Modulada FM, bidireccional

25 years of continuous CO2 and CH4 measurements at Izaña Global GAW mountain station: annual cycles and interannual trends

Comunicación presentada en: Symposium on Atmospheric Chemistry and Physics at Mountain Sites (ACP Symposium) celebrado del 8 al 10 de junio de 2010 en Interlaken, Suiza

Self-Adaptative Troubleshooting for to Guide Resolution of Malfunctions in Aircraft Manufacturing

The increasing complexity of systems and the heterogeneous origin of the possible malfunctions bring about the necessity of rede ning the troubleshooting processes. Troubleshooting comprises the set of steps for the systematic analysis of the symptoms after the detection of a malfunction. The complexity of certain systems, such as aircraft, means the origin of that malfunction can be any of several reasons, where diagnosis techniques support engineers in determining the reason for the unexpected behaviour. However, derived from the high number of components involved in an aircraft, the list of possible fault origins can be extremely long, and the analysis of every element on the list, until the element responsible is found, can be very time-consuming and error-prone. As an alternative, certain input/output signals can be read to prevent the substitution of a correctly functioning component, by validating its behaviour in an indirect way. In order to optimise the actions to perform, we have identi ed the relevant parts of the model to propose a troubleshooting process to ascertain the signals to read and the components to substitute, while striving to minimise the action cost in accordance with a combination of structural analysis, the probability of malfunction associated to the components, and the cost associated to each extra signal read and component substituted. The proposal has been validated in a system taken from a real scenario obtained in collaboration with the Airbus Defence and Space company. A statistical analysis of the degree of improvement of the troubleshooting process has also been included.Ministerio de Ciencia e Innovación RTI2018-094283-B-C3