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Book Description
Ce rapport de thèse traite d'algorithme de modulation et de démodulation utilisables sur une station de base possédant un réseau d'antennes tant en émission qu'en réception et s'insérant dans un système de radiocommunication mobile utilisant la technique d'accès multiple à répartition par les codes. Dans un premier temps, nous nous attachons à l'élaboration d'un algorithme de réception spatio-temporel tendant à réduire les interférences issues des mobiles autres que d'intérêt. Cet algorithme prend place à côté d'un démodulateur de type Rake2D - algorithme de référence - dans un simulateur permettant de dépouiller des signaux réels. Après une synchronisation en temps et en fréquence des signaux à démoduler, les taux d'erreurs donnés par l'algorithme anti-références sont comparés à ceux de l'algorithme de référence. Le gain de performance en terme de taux d'erreur de l'algorithme de référence. Le gain de performance en terme de taux d'erreur de l'algorithme anti-interférence étant faible vis à vis du récepteur de référence que nous avons choisi, nous proposons un nouveau critère de réception, permettant d'aboutir à un récepteur spatio-temporel, optimal, linéaire et multiulisateur. La structure finalement obtenue est celle du récepteur MLSE validée par un ensemble de simulations numériques sur des signaux synthètiques utilisant des codes d'étalement non cycliques. Par la suite, nous quitterons les algorithmes de réception pour les algorithmes d'émission. Nous proposons alors un algorithme purement spatial calculant au mieux les pondérations d'antennes et les puissances à émettre en direction des différents mobiles d'une cellule. Cet algorithme - dit algorithme de l'obèle - converge vers la valeur optimale des pondérations d'antennes et des puissances émises pour chaque récepteur mobile. Les performances de cet algorithme sont évaluées en terme de puissance émise.
Book Description
Ce rapport de thèse traite d'algorithme de modulation et de démodulation utilisables sur une station de base possédant un réseau d'antennes tant en émission qu'en réception et s'insérant dans un système de radiocommunication mobile utilisant la technique d'accès multiple à répartition par les codes. Dans un premier temps, nous nous attachons à l'élaboration d'un algorithme de réception spatio-temporel tendant à réduire les interférences issues des mobiles autres que d'intérêt. Cet algorithme prend place à côté d'un démodulateur de type Rake2D - algorithme de référence - dans un simulateur permettant de dépouiller des signaux réels. Après une synchronisation en temps et en fréquence des signaux à démoduler, les taux d'erreurs donnés par l'algorithme anti-références sont comparés à ceux de l'algorithme de référence. Le gain de performance en terme de taux d'erreur de l'algorithme de référence. Le gain de performance en terme de taux d'erreur de l'algorithme anti-interférence étant faible vis à vis du récepteur de référence que nous avons choisi, nous proposons un nouveau critère de réception, permettant d'aboutir à un récepteur spatio-temporel, optimal, linéaire et multiulisateur. La structure finalement obtenue est celle du récepteur MLSE validée par un ensemble de simulations numériques sur des signaux synthètiques utilisant des codes d'étalement non cycliques. Par la suite, nous quitterons les algorithmes de réception pour les algorithmes d'émission. Nous proposons alors un algorithme purement spatial calculant au mieux les pondérations d'antennes et les puissances à émettre en direction des différents mobiles d'une cellule. Cet algorithme - dit algorithme de l'obèle - converge vers la valeur optimale des pondérations d'antennes et des puissances émises pour chaque récepteur mobile. Les performances de cet algorithme sont évaluées en terme de puissance émise.
Author: Xavier Begaud Publisher: John Wiley & Sons ISBN: 1118586573 Category : Technology & Engineering Languages : en Pages : 217
Book Description
Ultra Wide Band Technology (UWB) has reached a level of maturity that allows us to offer wireless links with either high or low data rates. These wireless links are frequently associated with a location capability for which ultimate accuracy varies with the inverse of the frequency bandwidth. Using time or frequency domain waveforms, they are currently the subject of international standards facilitating their commercial implementation. Drawing up a complete state of the art, Ultra Wide Band Antennas is aimed at students, engineers and researchers and presents a summary of internationally recognized studies.
Author: Alain Sibille Publisher: Academic Press ISBN: 0123821959 Category : Technology & Engineering Languages : es Pages : 385
Book Description
Foreword from Arogyaswami Paulraj, Professor (Emeritus), Stanford University (USA) - The first book to show how MIMO principles can be implemented in today's mobile broadband networks and components - Explains and solves some of the practical difficulties that arise in designing and implementing MIMO systems - Both theory and implementation sections are written in the context of the most recent standards: IEEE 802.11n (WiFi); IEEE 802.16 (WIMAX); 4G networks (3GPP/3GPP2, LTE)
Author: Roberto Verdone Publisher: Springer Science & Business Media ISBN: 144712314X Category : Computers Languages : en Pages : 696
Book Description
Reporting the findings of COST 2100, a major European intergovernmental project, this volume offers system designers a good source of guidelines based on channel characterization and measurement-based modeling, as well as worthwhile ideas for future research.
Author: Rob Flickenger Publisher: "O'Reilly Media, Inc." ISBN: 9780596005023 Category : Computers Languages : en Pages : 190
Book Description
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.
Author: Rob Flickenger Publisher: "O'Reilly Media, Inc." ISBN: 9780596005597 Category : Computers Languages : en Pages : 310
Book Description
Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
Author: Michael Möser Publisher: Springer Science & Business Media ISBN: 3540927239 Category : Technology & Engineering Languages : en Pages : 540
Book Description
Suitable for both individual and group learning, Engineering Acoustics focuses on basic concepts and methods to make our environments quieter, both in buildings and in the open air. The author’s tutorial style derives from the conviction that understanding is enhanced when the necessity behind the particular teaching approach is made clear. He also combines mathematical derivations and formulas with extensive explanations and examples to deepen comprehension. Fundamental chapters on the physics and perception of sound precede those on noise reduction (elastic isolation) methods. The last chapter deals with microphones and loudspeakers. Moeser includes major discoveries by Lothar Cremer, including the optimum impedance for mufflers and the coincidence effect behind structural acoustic transmission. The appendix gives a short introduction on the use of complex amplitudes in acoustics.
Author: Jean Goubault-Larrecq Publisher: Springer Science & Business Media ISBN: 9781402003684 Category : Computers Languages : en Pages : 448
Book Description
Interest in computer applications has led to a new attitude to applied logic in which researchers tailor a logic in the same way they define a computer language. In response to this attitude, this text for undergraduate and graduate students discusses major algorithmic methodologies, and tableaux and resolution methods. The authors focus on first-order logic, the use of proof theory, and the computer application of automated searches for proofs of mathematical propositions. Annotation copyrighted by Book News, Inc., Portland, OR
Author: World Bank Publisher: World Bank Publications ISBN: 0821385631 Category : Social Science Languages : en Pages : 114
Book Description
This report provides the most comprehensive and rigorous analysis of Iraqi income and expenditure in several decades. The report makes extensive use of the Iraq Household Socio-Economic Survey, the first nationwide income and expenditure survey since 1988. IHSES data is complemented income and expenditure data from a wide range of other measures of living standards, allowing us to analyze living standards in a holistic way. The analysis presented here was performed with two main goals first, to inform the Government s Poverty Reduction Strategy; and second, to serve as a baseline for future assessments of changes in living standards and the identification of critical issues for deeper examination. Iraqi living standards have two unusual characteristics. First, they have fallen over the past generation. Second, they feature surprisingly little inequality. These characteristics are both rooted in Iraq s recent history of authoritarian government, war, military occupation, insurgency, and civil strife leading to infrastructure destruction and population displacement. There have been few opportunities for individuals to prosper from professional or entrepreneurial activities. Decades of neglected investment have resulted in deterioration of social services and economic infrastructure. Consequently, individuals have lacked capabilities to prosper and an investment climate conducive to prosperity. School enrollment and life expectancy have declined. Extremely low returns to education reflect the combination of poor educational quality and lack of employment opportunities. In terms of economic infrastructure, access to reliable electricity and water, and even access to paved roads are low, are further reflections of decades of neglect. While the upper end of the distribution has been pulled down by a lack of opportunities, the lower end has been supported by direct government provision of food. The Public Distribution System (PDS) provides 85 percent of food needs. While PDS has been useful as a safety net for the poor and the vulnerable, the system is expensive, inefficient, and fiscally risky. Indeed, PDS food rations account for a far greater share of public spending than does education or health. Going forward, Iraq faces two main challenges. First, although Iraq does not have to develop from scratch, it faces a formidable challenge in re-development. Second, a shift by the Government is required from direct provision of basic subsistence toward investment in human capacities. The Government can provide an enabling environment through investments in economic infrastructure and services to business and citizens, thus allowing the population to make productive use of education and their own labor. Both challenges are now being taken up by the Poverty Reduction Strategy, which articulates a detailed set of required actions and outlines priorities for government spending.
Author: Joël Bertrand
Author: Joël Bertrand
Author: Xavier Begaud
Author: Canadian Intellectual Property Office. Patent Office
Author: Alain Sibille
Author: Roberto Verdone
Author: Rob Flickenger
Author: Rob Flickenger
Author: Michael Möser
Author: Jean Goubault-Larrecq
Author: World Bank