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Books > Professional & Technical > Electronics & communications engineering > Communications engineering / telecommunications > Telephone technology
Health Effects of Cell Phone Radiation will offer a concentrated and up-to-date overview on the effects of radio frequencies on human tissue. While significant advances are being made on many fronts, ranging in frequency from quasi-static to the optical regime, a special emphasis of this volume is on current understanding of biological interactions of cellular mobile communication radiation. The use of cell-phones has experienced phenomenal growth - some estimate that there will be more than 3.5 billion users of these wireless devices by the end of 2010, worldwide. The widespread impact of these new wireless technologies has raised concerns about the safety of human exposure to radio-frequency (RF) energy emitted by these telecommunication devices. A better understanding of the biological effects of RF electromagnetic field is needed to safeguard against possible harm to the general population. Fortunately in recent years there has been a resurgence of research interest in achieving a quantitative understanding of the relationships between the biological effects of RF radiation and the physical variables that may cause them. A significant number of results have and are beginning to appear in the literature. This volume reviews and assesses the biological effects of exposure to electromagnetic fields from wireless communication technology.
Gossip network algorithms, as the name suggests, are built upon a gossip or rumor style unreliable, asynchronous information exchange protocol. They provide algorithmic architecture of choice for many of the emerging networks -- such as sensor networks, peer-to-peer networks, social networks and mobile networks of vehicles -- that are primarily not designed for, but required to perform communication and computation. Examples include, estimation algorithms in sensor networks, broadcasting news through a peer-to-peer network, or viral advertising in a social network. Gossip algorithms captures the recent excitement in this interdisciplinary topic that is witnessed across the fields of communication, computation, control, signal processing and algorithms
karmano hy api boddhavyam boddhavyam ca vikarmanah akarmanas ca boddhavyam gahana karmano gatih The intricacies of action are very hard to understand. Therefore one should know properly what action is, what forbidden action is, and what inaction is. The Bhagvad Gita (4.17) This book is the outcome of the research contribution of Hanane Fathi towards her Ph.D. studies jointly with Shyam S. Chakraborty and Ramjee Prasad as - pervisors. To the best of the authors' knowledge, this is a ?rst book on voice over Internet protocol (VoIP) covering such a broad perspective as illustrated in Figure P.1. This book is a new, forward-looking resource that explores the present and future trends of VoIP in the wireless heterogeneous networks. This book also provides the discovery path that these network infrastructures are following from a perspective of synergies with the present systems and how they will pave the way for future systems. This book is intended for everyone in the ?eld of wireless information and multimedia communications. It provides different levels of material suitable for managers, researchers, network providers, and graduate students. We hope that all readers will experience the bene?ts and power of this knowledge. We have tried our best to make each chapter comprehensive and we cannot claim that this book is without errors. Any remarks to improve the text and correct the errors would be highly appreciated.
Explores global m-commerce strategies and technological standards, and provides cases of the subject from a global perspective.
This book responds to the growing need to secure critical infrastructure by creating a starting place for new researchers in secure telecommunications networks. It is the first book to discuss securing current and next generation telecommunications networks by the security community. The book not only discusses emerging threats and systems vulnerability, but also presents the open questions posed by network evolution and defense mechanisms. It is designed for professionals and researchers in telecommunications. The book is also recommended as a secondary text for graduate-level students in computer science and electrical engineering.
Have you ever wanted to learn text messaging lingo so you could
decipher what your kids were text messaging to each other or have
you ever wanted to become an expert in text messaging so you could
send someone a quick message? Either way, this book is for you.
This book will demystify the art of text messaging.
This book reports the newest research and technical achievements on the following theme blocks: Design of mobile map services and its constraints, typology and usability of mobile map services, visualization solutions on small displays for time-critical tasks, mobile map users, interaction and adaptation in mobile environments and applications of map-based mobile services.
Power Control in Wireless Cellular Networks provides a comprehensive survey of the models, algorithms, analysis, and methodologies in this vast and growing research area. It starts with a taxonomy of the wide range of power control problem formulations, and progresses from the basic formulation to more sophisticated ones. When transmit power is the only set of optimisation variables, algorithms for fixed SIR are presented first, before turning to their robust versions and joint SIR and power optimization. This is followed by opportunistic and non-cooperative power control. Then joint control of power together with beamforming pattern, base station assignment, spectrum allocation, and transmit schedule are surveyed one by one. Power Control in Wireless Cellular Networks highlights the use of mathematical language and tools in the study of power control, including optimisation theory, control theory, game theory, and linear algebra. Practical implementations of some of the algorithms in operational networks are discussed in the concluding chapter.
The fundamentals of mobile communications technology and systems will be considered including the history and service evolution of mobile communications and environments, etc. CDMA technology including spread spectrum and orthogonal and PN code and etc., will be introduced. We will discuss the fundamentals of single carrier CDMA technologies including DS CDMA, Broadband CDMA with frequency domain equalizer, etc., and multi-carrier CDMA technology for high speed data transmission including MC-DS/CDMA, MC-CDMA, etc.
IPv6 (Internet Protocol version 6) is the future of Internet
telephony. And this book is your guide to that future.
This popular book was updated in 2013 just thirteen years after the death of the glamourous film star Hedy Lamarr. She was a famous Hollywood star and the first woman to appear naked on film. George Antheil was a piano player and composer. So just how did these two come to invent the latest technology used by the mobile phone? Or did they? She was labelled 'the most beautiful girl in the world' and he 'the bad boy of music' yet way back in 1942 they took out a patent covering the vital radio technique that we now call spread spectrum. This absorbing book traces the eventful and sometimes scandalous lives of Hedy and George. It tells the fascinating story of radio and the ongoing battle to make it secure and of similar quality to wired communication. Spread spectrum emerged from that battle to become the solution of choice for anything from mobile phones to wireless computer networks.
This book provides an accessible introduction to the theoretical foundations of modern coding theory, with many applications to wireless transmission systems. State-of-the-art coding theory is explained based on soft (maximum-likelihood) decoding rather than on algebraic decoding. Convolutional codes, trellis-coded modulation, turbo codes, and low-density parity-check (LDPC) codes are covered, with specific reference to the graphical structures through which they can be described and decoded (trellises and factor graphs). A special section addresses multiple-antenna systems and space-time codes.
Quality of Telephone-Based Spoken Dialogue Systems is a systematic overview of assessment, evaluation, and prediction methods for the quality of services such as travel and touristic information, phone-directory and messaging, or telephone-banking services. A new taxonomy of quality-of-service is presented which serves as a tool for classifying assessment and evaluation methods, for planning and interpreting evaluation experiments, and for estimating quality. A broad overview of parameters and evaluation methods is given, both on a system-component level and for a fully integrated system. Three experimental investigations illustrate the relationships between system characteristics and perceived quality. The resulting information is needed in all phases of system specification, design, implementation, and operation. Although Quality of Telephone-Based Spoken Dialogue Systems is written from the perspective of an engineer in telecommunications, it is an invaluable source of information for professionals in signal processing, communication acoustics, computational linguistics, speech and language sciences, human factor design and ergonomics
Wireless Messaging UNDERSTAND WHY WIRELESS MESSAGING IS THE NEXT COMMUNICATIONS PHENOMENON A booming worldwide craze—with more than 850 million messages exchanged during one month in the U.K. alone—wireless messaging, like SMS, EMS, and MMS, is now ready to conquer the U.S. market. This guide for telecom professionals tells you what you want to know about wireless messaging without getting mired in technical details. From mobile e-commerce applications, technical and architectural components, and the standards that have made SMS a success abroad, Wireless Messaging Demystified provides the vital details you want. You must read this book if— The easiest way to investigate why wireless messaging is one of the biggest communications successes ever, Wireless Messaging Demystified is the only guide you need to fully understand everything about instant messaging, mobile commerce, and wireless location-based services.
OSI IN THE VOICE ENVIRONMENT
Mobile communications are about to enter the third stage in their development, widely known as 3G. This will bring always-on Internet access to mobile devices. This book investigates the history of mobile communications and explores the technological background to 3G in a user-friendly manner. It examines the licensing process throughout the world, and draws conclusions about the prospects for 3G through a comprehensive analysis of the issues that have been raised so far.
As the number of mobile device users increases rapidly and exceeds that of PC users by a large margin, conducting business and services over these mobile devices, also known as mobile commerce is becoming very attractive and is expected to drive the future development of electronic commerce. To tap the potential of mobile commerce, application providers, service providers, content providers, and technology providers have to work together to realize the future mobile commerce applications. In the process of conceptualizing and developing these applications, they have to be cognizant of the latest development in mobile commerce technology. This serves as an introduction to mobile commerce with emphasis on both theory and application.
This book describes the physical layer of UMTS (Universal Mobile Telecommunication System) which is one of the five members of the IMT-2000 family of standards. It compiles in a clear fashion the main technical features of the physical layer standard together with a description of the basics of digital communications and spread spectrum technology on which UMTS relies. In addition the test cases specified in the standard are described together with their implications on any practical front-end design. The reader will benefit from the standard description which frees him from studying lots of standardization documents. Additional explanations of the standard and especially the test cases will help to better understand the effects on any front-end system design. Many references are provided for readers interested in in-depth treatments of certain topics.
Telecommunication Network Intelligence is a state-of-the-art book that deals with issues related to the development, distribution, and management of intelligent capabilities and services in telecommunication networks. The book contains recent results of research and development in the following areas, among others: Platforms for Advanced Services; Active and Programmable Networks; Network Security, Intelligence, and Monitoring; Quality-of-Service Management; Mobile Agents; Dynamic Switching and Network Control; Services in Wireless Networks; Infrastructure for Flexible Services. Telecommunication Network Intelligence comprises the proceedings of SmartNet 2000, the Sixth International Conference on Intelligence in Networks, which was sponsored by the International Federation for Information Processing (IFIP) and held at the Vienna University of Technology, Vienna, Austria, in September 2000.
A study of the architectures of the systems that provide telephone service, including a look at architectures for future systems. It describes the hardware and software of five different systems in detail, offering communications professionals the information they need to understand switching systems in historical context and in relation to regulatory frameworks. The book also examines how factors such as customer services and modern computer applications have affected switching systems, and it provides background discussions on relevant theory and boundary conditions - such as transmission systems, telephone operation, and the human element.
The area of analog integrated circuits is facing some serious challenges due to the ongoing trends towards low supply voltages, low power consumption and high-frequency operation. The situation is becoming even more complicated by the fact that many transfer functions have to be tunable or controllable. A promising approach to facing these challenges is given by the class of dynamic translinear circuits, which are, as a consequence, receiving increasing interest. Several different names are used in literature: log-domain, exponential state-space, current-mode companding, instantaneous companding, tanh-domain, sinh-domain, polynomial state-space, square-root domain and translinear filters. In fact, all these groups are (overlapping) subclasses of the overall class of dynamic translinear circuits. Research Perspectives on Dynamic Translinear and Log-Domain Circuits is a compilation of research findings in this growing field. It comprises ten contributions, coming from recognized `dynamic-translinear' researchers in Europe and North America. Research Perspectives on Dynamic Translinear and Log-Domain Circuits is an edited volume of original research.
This easy-to-understand explanation of major aspects of today's telecommunications systems aims to give readers comprehensive coverage of the four major areas of telephone systems - station apparatus, transmission, switching and signalling. While maintaining all the fundamental information from the earlier editions, this revised and updated edition includes a perspective on telephony that includes central office, local loop, subscriber loop carrier, switching, multiplexing, LATA, signalling and network architecture. It also includes developments in fibre optic systems, information on PCS systems including GSM, TDMA, CDMA and policy implications of the US Telecommunications Act of 1996.
Unlock the Full Power of Your Android (TM) Smartphone or Tablet Discover hundreds of tips and tricks you can use right away with your Android device to get more done, and have more fun. You'll learn how to use your Android smartphone or tablet as a powerful communication, organization, and productivity tool as well as a feature-packed entertainment device. You will dig deep into the settings and capabilities of both Android itself and the preinstalled apps, developing the knowledge and skills to exploit them to the fullest. Easy to understand and non-technical, Android Tips and Tricks is perfect for beginners-and for more experienced users ready to ramp up their productivity or move to newer devices. It covers all new and recent Android smartphones and tablets running Android 6 (Marshmallow) or Android 5 (Lollipop)-with bonus, in-depth coverage of Samsung's widely used TouchWiz skin. Here's just a sampling of what this book's tips, tricks, and techniques will help you do: * Connect to wireless and cellular networks, to keyboards and Bluetooth devices, and via VPNs * Transform your device into a portable Wi-Fi hotspot, and share Internet connections via USB or Bluetooth * Secure Android with screen and SIM locks, location settings, and encryption * Sideload apps from any source and keep bad apps from loading * Take Gmail to pro level with signatures, vacation responders, labels, archiving, advanced search, and secure two-step verification * Manage multiple email accounts together: POP, IMAP, web mail, and Exchange * Get more out of your Google Chrome browser, and share bookmarks across all your devices * Chat via text, audio, or video on Google Hangouts-and customize it to work just the way you want * Enjoy your music everywhere, whether it's stored locally or in the cloud * Easily capture, edit, and share top-quality photos and videos * Transform your smartphone or tablet into a total social networking hub * Squeeze more battery life from your Android device |
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