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Modelo de predicción de la ocupación espectral para el análisis y diseño de redes de radio cognitiva
Con la llegada de las aplicaciones multimedia de banda ancha y la creciente demanda de acceso a la red de información de los dispositivos móviles, es esencial mejorar la eficiencia en la utilización del espectro electromagnético para cubrir las necesidades de altas tasas de bits proporcionales a los servicios multimedia. Por tal razón, la radio cognitiva se ha convertido en uno de los paradigmas más investigados en las comunicaciones de radio para optimizar el uso del espectro radioeléctrico.
Modelo de asignación espectral multiusuario para redes de radio cognitiva descentralizadas
El crecimiento de las aplicaciones inalámbricas plantea nuevos desafíos a los futuros sistemas de comunicación, como el uso ineficiente del espectro radioeléctrico. Las redes de radio cognitiva surgen como una solución a los problemas de escasez de espectro y uso ineficiente del recurso espectral, mediante el acceso dinámico al espectro. Estas redes están caracterizadas por percibir, aprender, planificar (toma de decisiones) y actuar de acuerdo con las condiciones actuales de la red. El objetivo general de una red de radio cognitiva consiste en que el usuario secundario acceda de manera oportuna a un canal de frecuencia disponible en una banda licenciada, sin generar interferencia al ...
The High History of the Holy Graal
Reproduction of the original. The publishing house Megali specialises in reproducing historical works in large print to make reading easier for people with impaired vision.
Prevention and Treatment of Childhood Obesity
This volume, containing 24 papers and 19 poster papers, reviews the etiology and epidemiology of childhood obesity. It explores genetic and contributory environmental factors. It also describes recent research and educational efforts in prevention of the condition, including programmes aimed at high-risk minority populations.
Visions of Freedom
Visions of Freedom: Havana, Washington, Pretoria, and the Struggle for Southern Africa, 1976-1991
Naked in Paradise
The original new age nudist movement in Switzerland.
Doing Business in 2006
This publication is the third in a series of annual reports giving a comparative analysis of business regulations and their enforcement across 155 countries and over time. Comparable data indicators are given for 10 topics: starting a business, dealing with licences, hiring and firing workers, registering property, getting credit, investment protection, paying taxes, trading across borders, enforcing contracts, and closing a business. These indicators are used to assess socio-economic outcomes including levels of unemployment and poverty, productivity, investment and corruption; and to identify which regulatory measures enhance business activity and those that work to constrain it. This is a co-publication of the World Bank and the International Finance Corporation.
Henry Adams
This book, first published in 1933, examines the life and achievements of Henry Adams, the American historian and political journalist. It looks at his youth and early development of his ideas, and goes on to look at his time as a diplomat, historian and journalist – and his impact upon American political and intellectual life.
