The past decade has seen many advances in physical layer wireless communication theory and their implementation in wireless systems. This textbook takes a unified view of the fundamentals of wireless ...communication and explains the web of concepts underpinning these advances at a level accessible to an audience with a basic background in probability and digital communication. Topics covered include MIMO (multi-input, multi-output) communication, space-time coding, opportunistic communication, OFDM and CDMA. The concepts are illustrated using many examples from real wireless systems such as GSM, IS-95 (CDMA), IS-856 (1 x EV-DO), Flash OFDM and UWB (ultra-wideband). Particular emphasis is placed on the interplay between concepts and their implementation in real systems. An abundant supply of exercises and figures reinforce the material in the text. This book is intended for use on graduate courses in electrical and computer engineering and will also be of great interest to practising engineers.
Media, structures, and power Comor, Edward A
Media, structures, and power,
c2011, 20111122, 2011, 2014, 2011-10-30, 2011-01-01
eBook
Containing introductions and contributions by other prominent scholars, this volume situates Babe's work within contemporary scholarship and underscores the extent to which he is one of Canada's most ...prescient thinkers.
The 3GPP has raised the need to revisit the design of next generations of cellular networks in order to make them capable and efficient to provide M2M services. One of the key challenges that has ...been identified is the need to enhance the operation of the random access channel of LTE and LTE-A. The current mechanism to request access to the system is known to suffer from congestion and overloading in the presence of a huge number of devices. For this reason, different research groups around the globe are working towards the design of more efficient ways of managing the access to these networks in such circumstances. This paper aims to provide a survey of the alternatives that have been proposed over the last years to improve the operation of the random access channel of LTE and LTE-A. A comprehensive discussion of the different alternatives is provided, identifying strengths and weaknesses of each one of them, while drawing future trends to steer the efforts over the same shooting line. In addition, while existing literature has been focused on the performance in terms of delay, the energy efficiency of the access mechanism of LTE will play a key role in the deployment of M2M networks. For this reason, a comprehensive performance evaluation of the energy efficiency of the random access mechanism of LTE is provided in this paper. The aim of this computer-based simulation study is to set a baseline performance upon which new and more energy-efficient mechanisms can be designed in the near future.
This book emphasizes U.S. policy considerations in as much as the U.S. has been at the forefront of satellite technology and its application. It addresses the impact of the earlier U.S. policy of ...global monopoly on the development of international satellite systems.
Networks are a collection of computers, servers, mobile devices or other computing devices connected with a view to sharing data. This book will help you get well-versed with the basic concepts of ...networking and will help you to pass Microsoft's MTA Networking Fundamentals Exam 98-366.
This open access book offers comprehensive, self-contained knowledge on Digital Twin (DT), which is a very promising technology for achieving digital intelligence in the next-generation wireless ...communications and computing networks. DT is a key technology to connect physical systems and digital spaces in Metaverse. The objectives of this book are to provide the basic concepts of DT, to explore the promising applications of DT integrated with emerging technologies, and to give insights into the possible future directions of DT. For easy understanding, this book also presents several use cases for DT models and applications in different scenarios. The book starts with the basic concepts, models, and network architectures of DT. Then, we present the new opportunities when DT meets edge computing, Blockchain and Artificial Intelligence, and distributed machine learning (e.g., federated learning, multi-agent deep reinforcement learning). We also present a wide application of DT as an enabling technology for 6G networks, Aerial-Ground Networks, and Unmanned Aerial Vehicles (UAVs). The book allows an easy cross-reference owing to the broad coverage on both the principle and applications of DT. The book is written for people interested in communications and computer networks at all levels. The primary audience includes senior undergraduates, postgraduates, educators, scientists, researchers, developers, engineers, innovators and research strategists.
This collection analyses the regulatory aspects of harmful interference faced by those entities operating space communication and broadcasting. While technology reacts to this international ...phenomenon with the development of continuously improving technological systems for preventing and combating harmful interference, its international regulatory and legal framework develops at a much slower pace. Issues discussed include the increasing deterioration of signals from broadcasting and communication satellites, including cases of intentional interference known as `jamming’; the human rights balance between freedom of expression and protection from hate speech; the efficacy of the current regulatory system and the legal consequences of non-compliance; the role of national authorities, and supranational bodies such as the EU and UN. The contributors include experts drawn from international and national academia, the ITU, national regulatory authorities and operators to present an international, multidimensional, and critical analysis of this complex phenomenon.
Introduction, Mahulena Hofmann. Part I Harmful Interference in the Context of the ITU Framework: 'Harmful interference' and the ITU, Francis Lyall; ITU and harmful interference prevention, Mitsuhiro Sakamoto; Dealing with harmful interference: the Protostar case, Elina Morozova and Yaroslav Vasyanin; Radio frequency interference in the Earth Exploration Satellite Service: the case of the European Space Agency's SMOS mission, Alexander Soucek; Contractual responses to loss of satellite based services, Lesley Jane Smith. Part II Harmful Interference in the Context of Space Law: The 'space side' to 'harmful interference' - evaluating regulatory instruments in addressing interference issues in the context of satellite communications, Frans von der Dunk; Harmful interference in telecommunications under international and national space law, Jean-Francois Mayence. Part III Harmful Interference in the Context of European Law: European law as an instrument for avoiding harmful interference, Gerry Oberst; The European Commission's proposal for a 'connected continent', Max Spielmann. Part IV Harmful Interference from the Perspective of National Law: Harmful interference from the Netherlands Radiocommunication Agency perspective, Johan Kroon; Satellite harmful interference: a U.S. Telecom perspective, Justin (Gus) Hurwitz. Part V Other Instruments for Avoiding Harmful Interference: New and alternative means for safeguarding the efficient use of spectrum resources for satellite communications, Simona Spassova; Harmful interference and human rights, Olga Batura. Part VI Outstanding Issues: The restructuring of an intergovernmental satellite communications organisation from a Luxmbourg perspective, Guy Modert.
Professor Mahulena Hofmann, SES Chair in Space Communication and Media Law at the University of Luxembourg. Prior to her appointment at the University of Luxembourg, Professor Hofmann was the holder of the Jean Monnet Chair in European Law and Transition Studies at the Faculty of Law, Justus Liebig University of Giessen. At the same time she served as a Senior Research Fellow at the renowned Max Planck Institute for Comparative Public Law and International Law where her research activities were in the field of International Space and Telecommunications Law, as well as the public law of Central and Eastern European countries. Member of the European Centre for Space Law and an Expert Committee of the Council of Europe dealing with regional and minority languages, she has a rich scientific profile encompassing all aspects of Satellite Communication and Media Law.
This book combines a detailed, sector-specific study of comparative telecommunications regimes set in the context of the EC, with an extensive historical and empirical analysis of individual policy ...management and change as experienced by three diverse regulatory cultures, namely, Britain, the Netherlands and France. By adopting a comprehensive analytical framework based on far-reaching literature, the author explores a wide-range of theories, addressing key issues at the forefront of contemporary political and academic debate as: Do nation states matter in the globalizing telecommunications industry? Does the common challenge of techno-global telecommunications restructuring elicit different national responses? What is the significance of a single-speed or multi-speed Europe in implementing telecommunications governance regimes?
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