third generation and wideband hf radio communications mobile communications

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Third Generation And Wideband Hf Radio Communications

Author : Eric E. Johnson
ISBN : 9781608075034
Genre : Technology & Engineering
File Size : 31. 19 MB
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Written by the developers of the new 21st century HF (high frequency) radio technology, this groundbreaking resource presents the powerful new capabilities and technical details of 3G and WBHF (wideband high frequency) waveforms to help you understand and use the ionospheric channel for video and high-speed data transmission. Featuring more than 180 illustrations, this practical book enables you to utilize this technology to communicate voice and data over the horizon without needing anyone elses infrastructure, send video beyond line of sight from moving platforms, and communicate over long ranges at such low power that it is nearly undetectable. You learn the rationale behind the new US and NATO standards for HF radio communications directly from their developers. Additionally, the book looks at the future direction of this technology and areas requiring further research.

Aeronautical Radio Communication Systems And Networks

Author : Dale Stacey
ISBN : 0470035099
Genre : Technology & Engineering
File Size : 48. 7 MB
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Typically, there are over twenty radio systems on board the average commercial jet aircraft dealing with communication, navigation and surveillance functions. Very high frequency (VHF) air-to-ground communication is usually the main method of information and control exchange between pilot and air traffic control. Satellite and high frequency radio links are used to complement this system for long range or oceanic information exchanges. Other communications systems are required between the airline operation centre and the pilot and sometimes between the passengers and the ground. A comprehensive guide to current systems, networks and topologies, this book covers application requirements for communication and related radio-navigation and surveillance functions in aeronautical systems. There is also an insight into future possibilities as technologies progress and airspace operation and control scenarios change. Ideal for civil aviation authorities, airspace management providers and regulatory organizations, Aeronautical Radio Communication Systems and Networks will also appeal to aircraft and radio equipment manufacturers and university students studying aeronautical or electronic engineering. Key features: Provides a broad and concise look at the various communications systems on board a typical aircraft from a theoretical, system level and practical standpoint with worked examples and case studies throughout. Considers all types of aircraft from light aircraft to large commercial jets and specialised supersonic aircraft. Looks at existing airport radio communication infrastructure and proposals for new very high bandwidth radio applications within the airport environment. Provides a complete list of formulae for engineering design analysis and quick checks on system performance or interference analysis.

Uwb Communication Systems

Author : Maria-Gabriella Di Benedetto
ISBN : 9789775945105
Genre : Technology & Engineering
File Size : 43. 57 MB
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Ultrawideband (UWB) communication systems offer an unprecedented opportunityto impact the future communication world. The enormous available bandwidth, the wide scope of the data rate / rangetrade-off, as well as the potential for very low-cost operation leading topervasive usage, all present a unique opportunity for UWB systems to impactthe way people and intelligent machines communicate and interact with theirenvironment. The aim of this book is to provide an overview of the state of the art of UWBsystems from theory to applications. Due to the rapid progress of multidisciplinary UWB research, such an overviewcan only be achieved by combining the areas of expertise of severalscientists in the field. More than 30 leading UWB researchers and practitioners have contributed tothis book covering the major topics relevant to UWB. These topics includeUWB signal processing, UWB channel measurement and modeling, higher-layerprotocol issues, spatial aspects of UWB signaling, UWB regulation andstandardization, implementation issues, and UWB applications as well aspositioning. The book is targeted at advanced academic researchers, wireless designers, and graduate students wishing to greatly enhance their knowledge of allaspects of UWB systems

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ISBN : 7503805633
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File Size : 50. 46 MB
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本书阐述种子区划的目的和任务,林木地理变异的理论、种源研究和种源选择的原理和方法,种子区划的途径和方法以及各国种子区划的成就和经验等。

Software Defined Radio

Author : Walter H.W. Tuttlebee
ISBN : 9780470852637
Genre : Technology & Engineering
File Size : 86. 88 MB
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Software defined radio (SDR) is one of the most important topics of research, and indeed development, in the area of mobile and personal communications. SDR is viewed as an enabler of global roaming and as a unique platform for the rapid introduction of new services into existing live networks. It therefore promises mobile communication networks a major increase in flexibility and capability. SDR brings together two key technologies of the last decade - digital radio and downloadable software. It encompasses not only reconfiguration of the air interface parameters of handset and basestation products but also the whole mobile network, to facilitate the dynamic introduction of new functionality and mass-customised applications to the user's terminal, post-purchase. This edited book, contributed by internationally respected researchers and industry practitioners, describes the current technological status of radio frequency design, data conversion, reconfigurable signal processing hardware, and software issues at all levels of the protocol stack and network. The book provides a holistic treatment of SDR addressing the full breadth of relevant technologies - radio frequency design, signal processing and software - at all levels. As such it provides a solid grounding for a new generation of wireless engineers for whom radio design in future will assume dynamic flexibility as a given. In particular it explores * The unique demands of SDR upon the RF subsystem and their implications for front end design methodologies * The recent concepts of the 'digital front end' and 'parametrization' * The role and key influence of data conversion technologies and devices within software radio, essential to robust product design * The evolution of signal processing technologies, describing new architectural approaches * Requirements and options for software download * Advances in 'soft' protocols and 'on-the-fly' software reconfiguration * Management of terminal reconfiguration and its network implications * The concepts of the waveform description language The book also includes coverage of * Potential breakthrough technologies, such as superconducting RSFQ technology and the possible future role of MEMS in RF circuitry * Competing approaches, eg all-software radios implemented on commodity computing vs advanced processing architectures that dynamically optimise their configuration to match the algorithm requirements at a point in time The book opens with an introductory chapter by Stephen Blust, Chair of the ITU-R WP8F Committee and Chair of the SDR Forum presenting a framework for SDR, in terms of definitions, evolutionary perspectives, introductory timescales and regulation. Suitable for today's engineers, technical staff and researchers within the wireless industry, the book will also appeal to marketing and commercial managers who need to understand the basics and potential of the technology for future product development. Its balance of industrial and academic contributors also makes it suitable as a text for graduate and post-graduate courses aiming to prepare the next generation of wireless engineers.

Cellular Communications Explained

Author : Ian Poole
ISBN : 9780080456324
Genre : Technology & Engineering
File Size : 80. 21 MB
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Among the many books published on 3G and cellular telecommunications, this introduction stands out due to its broad coverage of the subject and straightforward explanations of the principles and applications using a minimum of maths. Writing as an engineer for engineers, Ian Poole provides a systems-level view of the fundamentals that will enhance the understanding of engineers involved working in this fast-paced field. Equally, the book helps students, technicians and equipment manufacturers to gain a working knowledge of the applications and technologies involved in cellular communications equipment and networks. The book focuses on the latest 2G, 2.5G and 3G technologies, including GSM (with GPRS and EDGE), NA-TDMA, cdmaOne (IS-95), CDMA2000 and UMTS (W-CDMA), with material on developing areas such as HSDPA. The fundamentals of radio propagation, modulation and cellular basics are also covered in a way that will give readers a real grasp of how cellular communications systems and equipment work. * Explains the principles and applications of cellular communications systems using a minimum of mathematics, providing a firm grounding for engineers, technicians and students. * Covers current technologies (2G, 2.5G) alongside 3G and other cutting-edge technologies, making this essential reading, not crystal ball gazing! * Provides coverage of fundamentals and whole systems, as well as equipment provides a wide knowledge base for engineers and technicians working in different parts of the industry: handset designers, network planners, maintenance technicians, technical sales, etc.

Lte The Umts Long Term Evolution

Author : Stefania Sesia
ISBN : 9780470978641
Genre : Technology & Engineering
File Size : 29. 42 MB
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"Where this book is exceptional is that the reader will not just learn how LTE works but why it works" Adrian Scrase, ETSI Vice-President, International Partnership Projects Following on the success of the first edition, this book is fully updated, covering the latest additions to LTE and the key features of LTE-Advanced. This book builds on the success of its predecessor, offering the same comprehensive system-level understanding built on explanations of the underlying theory, now expanded to include complete coverage of Release 9 and the developing specifications for LTE-Advanced. The book is a collaborative effort of more than 40 key experts representing over 20 companies actively participating in the development of LTE, as well as academia. The book highlights practical implications, illustrates the expected performance, and draws comparisons with the well-known WCDMA/HSPA standards. The authors not only pay special attention to the physical layer, giving an insight into the fundamental concepts of OFDMA-FDMA and MIMO, but also cover the higher protocol layers and system architecture to enable the reader to gain an overall understanding of the system. Key New Features: Comprehensively updated with the latest changes of the LTE Release 8 specifications, including improved coverage of Radio Resource Management RF aspects and performance requirements Provides detailed coverage of the new LTE Release 9 features, including: eMBMS, dual-layer beamforming, user equipment positioning, home eNodeBs / femtocells and pico cells and self-optimizing networks Evaluates the LTE system performance Introduces LTE-Advanced, explaining its context and motivation, as well as the key new features including: carrier aggregation, relaying, high-order MIMO, and Cooperative Multi-Point transmission (CoMP). Includes an accompanying website containing a complete list of acronyms related to LTE and LTE-Advanced, with a brief description of each (http://www.wiley.com/go/sesia_theumts) This book is an invaluable reference for all research and development engineers involved in implementation of LTE or LTE-Advanced, as well as graduate and PhD students in wireless communications. Network operators, service providers and R&D managers will also find this book insightful.

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