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Analisis De Interferencias En Un Sistema Mc Cdma Para Comunicaciones Moviles De Tercera Generacion
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Book Synopsis Análisis de interferencias en un sistema MC-CDMA para comunicaciones móviles de tercera generación by : Marta Mundo Cid
Download or read book Análisis de interferencias en un sistema MC-CDMA para comunicaciones móviles de tercera generación written by Marta Mundo Cid and published by . This book was released on 2001 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Principios de comunicaciones móviles by : Oriol Sallent Roig
Download or read book Principios de comunicaciones móviles written by Oriol Sallent Roig and published by Univ. Politèc. de Catalunya. This book was released on 2003 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: En este libro se presentan los aspectos fundamentales que intervienen en los sistemas de comunicaciones móviles, al objeto de facilitar la comprensión de los principios de funcionamiento y los requerimientos tanto actuales como futuros de dichos sistemas. Se hace hincapié en el componente conceptual y se intenta evitar en lo posible los desarrollos matemáticos. Con ello se pretende que los temas tratados permitan al lector una mejor asimilación de los mecanismos que intervienen en los sistemas de comunicaciones móviles. El texto se acompaña de ejemplos de aplicación sobre sistemas como GSM, DECT, Bluetooth, WLAN o UMTS, que ayudan a afianzar los conceptos expuestos y a conocer algunos parámetros concretos de diseño. Se asume que el lector tiene conocimientos previos de probabilidad y fundamentos de comunicaciones digitales.
Book Synopsis Contribución al estudio de técnicas de acceso aleatorio y al análisis de la calidad de servicio en sistemas de transmisión por paquetes para comunicaciones móviles basadas en CDMA. by :
Download or read book Contribución al estudio de técnicas de acceso aleatorio y al análisis de la calidad de servicio en sistemas de transmisión por paquetes para comunicaciones móviles basadas en CDMA. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: RESUMEN La presente tesis doctoral se enmarca dentro del sector de las comunicaciones móviles, y en particular de los denominados sistemas de tercera generación, que se plantean como objetivo el poder ofrecer una gran diversidad de servicios multimedia bajo unas ciertas garantías de calidad de servicio que difieren sustancialmente de las habitualmente consideradas para los servicios de voz. Bajo esta perspectiva, los sistemas de transmisión por paquetes basados en la técnica de acceso múltiple por división en código CDMA son capaces de llevar a cabo este cometido gracias a la flexibilidad que aportan y a la eficiencia en el uso de los recursos radio. El planteamiento del trabajo ha consistido en identificar un conjunto de funcionalidades en el nivel de acceso al medio MAC para gestionar la calidad de servicio a ofrecer. Éstas son las siguientes: - Protocolo de acceso múltiple: permite a los usuarios acceder al sistema y poder notificar sus necesidades de transmisión. - Algoritmo de gestión de recursos: encargado de ordenar las diferentes transmisiones a la vez que de determinar sus parámetros de transmisión (ganancia de procesado, niveles de potencia ...). - Estrategia de asignación dinámica de canales (DCA): permite discernir cuales de los recursos son más apropiados para cada uno de los usuarios en términos de interferencia recibida y generada hacia el resto, y presenta interés en un esquema de acceso híbrido por división en tiempo y en código. - Control de admisión: en base a la evaluación conjunta de las anteriores funcionalidades, se determina el límite máximo de usuarios de cada clase de servicio para mantener las garantías de todos ellos. A partir de aquí, el control de admisión es el responsable de garantizar que el número de usuarios en cada caso no supere el máximo establecido. Las diferentes funcionalidades a nivel MAC se sustentan en estrategias de retransmisión apropiadas a nivel de enlace lógico LLC para garantizar la integridad de la transmisión de l.
Book Synopsis Técnicas de acceso y gestión de recursos para garantizar calidad de servicio en sistemas de comunicaciones moviles basados en CDMA. by :
Download or read book Técnicas de acceso y gestión de recursos para garantizar calidad de servicio en sistemas de comunicaciones moviles basados en CDMA. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Resumen de Tesis Título: Técnicas de Acceso y Gestión de Recursos para Garantizar Calidad de Servicio en Sistemas de Comunicaciones Móviles basados en CDMA Autor: Luis Gonzaga Alonso Zárate Director: Ramón Agustí Comes En la presente tesis doctoral se ha realizado una serie de aportaciones para contribuir al desarrollo de los sistemas de comunicaciones móviles de tercera generación. Esta nueva generación de sistemas utilizará una técnica de acceso del tipo CDMA y pretende poder garantizar una cierta calidad de transmisión en las comunicaciones. En este sentido, esta tesis presenta nuevas propuestas tanto para el protocolo de acceso al medio (MAC) como para los algoritmos de gestión de los recursos radio (RRM). Las propuestas han sido presentadas, estudiadas y analizadas en diferentes entornos representativos de trabajo y se ha demostrado su validez para su utilización en un sistema real de comunicaciones. Además, por su sencillez de implementación y alta eficiencia en la utilización de los recursos, se ha comprobado que todas ellas son candidatas muy adecuadas para poder formar parte de los estándares en formación para los citados sistemas. Glosando los aspectos desarrollados en la presente tesis doctoral, cabe destacar los siguientes puntos:? Se han estudiado en profundidad las necesidades y requerimientos del interfaz radio en los sistemas de comunicaciones móviles de tercera generación, centrando el estudio en las transmisiones en modo paquete para entornos con acceso CDMA.? Se ha propuesto un nuevo protocolo MAC para trabajar en este entorno de operación. Asimismo, se ha realizado un modelo teórico del protocolo para el análisis de su rendimiento en sistemas genéricos con tráfico homogéneo. Se ha analizado con detalle el modelo para demostrar las propiedades cuasi-óptimas del protocolo, tanto en retardo como en throughput y estabilidad. El protocolo además introduce un concepto nuevo de control distribuido que minimiza la información de control necesaria, mejo.
Book Synopsis Mobile Fading Channels by : Matthias Pätzold
Download or read book Mobile Fading Channels written by Matthias Pätzold and published by Wiley-Blackwell. This book was released on 2002-04 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobile channel fading is a loss in transmission intensity caused by changes in the transmission medium. By dealing with the modelling, analysis and simulation of mobile fading channels this text provides a fundamental understanding of many issues in the area of mobile fading channel modelling.; The main topics addressed in the volume are: fundamentals of stochastic and deterministic channel models and modelling and simulation of frequency-nonselective and frequency-selective fading channels. The guide also features methods for the design and realization of efficient channel simulators and fast channel simulators and MATLAB-programs for the evaluation and simulation of mobile fading channels.
Book Synopsis Radio Spectrum Management by : Haim Mazar (Madjar)
Download or read book Radio Spectrum Management written by Haim Mazar (Madjar) and published by John Wiley & Sons. This book was released on 2016-08-29 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the fundamentals of wireless communications and services, explaining in detail what RF spectrum management is, why it is important, which are the authorities regulating the use of spectrum, and how is it managed and enforced at the international, regional and national levels. The book offers insights to the engineering, regulatory, economic, legal, management policy-making aspects involved. Real-world case studies are presented to depict the various approaches in different countries, and valuable lessons are drawn. The topics are addressed by engineers, advocates and economists employed by national and international spectrum regulators. The book is a tool that will allow the international regional and national regulators to better manage the RF spectrum, and will help operators and suppliers of wireless communications to better understand their regulators.
Book Synopsis Building Wireless Community Networks by : Rob Flickenger
Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.
Book Synopsis Medical Image Analysis Methods by : Lena Costaridou
Download or read book Medical Image Analysis Methods written by Lena Costaridou and published by CRC Press. This book was released on 2005-07-13 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: To successfully detect and diagnose disease, it is vital for medical diagnosticians to properly apply the latest medical imaging technologies. It is a worrisome reality that due to either the nature or volume of some of the images provided, early or obscured signs of disease can go undetected or be misdiagnosed. To combat these inaccuracies, diagno
Download or read book Smart Antennas written by Thomas Kaiser and published by Hindawi Publishing Corporation. This book was released on 2005 with total page 891 pages. Available in PDF, EPUB and Kindle. Book excerpt: Smart Antennas—State of the Art brings together the broad expertise of 41 European experts in smart antennas. They provide a comprehensive review and an extensive analysis of the recent progress and new results generated during the last years in almost all fields of smart antennas and MIMO (multiple-input multiple-output) transmission. The following represents a summarized table of content.Receiver: space-time processing, antenna combining, reduced rank processing, robust beamforming, subspace methods, synchronization, equalization, multiuser detection, iterative methods Channel: propagation, measurements and sounding, modelling, channel estimation, direction-of-arrival estimation, subscriber location estimation Transmitter: space-time block coding, channel side information, unified design of linear transceivers, ill-conditioned channels, MIMO-MAC strategies Network Theory: channel capacity, network capacity, multihop networks Technology: antenna design, transceivers, demonstrators and testbeds, future air interfaces Applications and Systems: 3G system and link level aspects, MIMO HSDPA, MIMO-WLAN/UMTS implementation issues This book serves as a reference for scientists and engineers who need to be aware of the leading edge research in multiple-antenna communications, an essential technology for emerging broadband wireless systems.
Book Synopsis Biometric Systems by : James L. Wayman
Download or read book Biometric Systems written by James L. Wayman and published by Springer Science & Business Media. This book was released on 2005-09-20 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biometric Systems provides practitioners with an overview of the principles and methods needed to build reliable biometric systems. It covers three main topics: key biometric technologies, design and management issues, and the performance evaluation of biometric systems for personal verification/identification. The four most widely used technologies are focused on - speech, fingerprint, iris and face recognition. Key features include: in-depth coverage of the technical and practical obstacles which are often neglected by application developers and system integrators and which result in shortfalls between expected and actual performance; and protocols and benchmarks which will allow developers to compare performance and track system improvements.
Book Synopsis Advances in Computer Science and Engineering by : Dehuai Zeng
Download or read book Advances in Computer Science and Engineering written by Dehuai Zeng and published by Springer Science & Business Media. This book was released on 2012-01-26 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book includes the proceedings of the second International Conference on Advances in Computer Science and Engineering (CES 2012), which was held during January 13-14, 2012 in Sanya, China. The papers in these proceedings of CES 2012 focus on the researchers’ advanced works in their fields of Computer Science and Engineering mainly organized in four topics, (1) Software Engineering, (2) Intelligent Computing, (3) Computer Networks, and (4) Artificial Intelligence Software.
Book Synopsis Fraud and Corruption by : Peter C. Kratcoski
Download or read book Fraud and Corruption written by Peter C. Kratcoski and published by Springer. This book was released on 2018-09-14 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook provides an overview of the major types of fraud and corrupt activities found in private and public agencies, as well as the various methods used to prevent fraud and corruption. It explores where opportunities for fraud exist, the personal characteristics of those who engage in fraud, as well as their prevention and control. This work covers fraud in the financial sector, insurance, health care, and police organizations, as well as cybercrime. It covers the relationship between fraud, corruption, and terrorism; criminal networks; and major types of personal scams (like identity theft and phishing). Finally, it covers the prevention and control of fraud, through corporate whistle blowing, investigative reporting, forensic accounting, and educating the public. This work will be of interest to graduate-level students (as well as upper-level undergraduates) in Criminology & Criminal Justice, particularly with a focus on white collar and corporate crime, as well as related fields like business and management.
