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Telephone technology

See below for a selection of the latest books from Telephone technology category. Presented with a red border are the Telephone technology books that have been lovingly read and reviewed by the experts at Lovereading. With expert reading recommendations made by people with a passion for books and some unique features Lovereading will help you find great Telephone technology books and those from many more genres to read that will keep you inspired and entertained. And it's all free!

Analysis and Design of Transmitarray Antennas

Analysis and Design of Transmitarray Antennas

Author: Ahmed H. Abdelrahman, Fan Yang, Atef Z. Elsherbeni, Payam Nayeri Format: Paperback / softback Release Date: 28/02/2017

In recent years, transmitarray antennas have attracted growing interest with many antenna researchers. Transmitarrays combines both optical and antenna array theory, leading to a low profile design with high gain, high radiation efficiency, and versatile radiation performance for many wireless communication systems. In this book, comprehensive analysis, new methodologies, and novel designs of transmitarray antennas are presented. Detailed analysis for the design of planar space-fed array antennas is presented. The basics of aperture field distribution and the analysis of the array elements are described. The radiation performances (directivity and gain) are discussed using array theory approach, and the impacts of element phase errors are demonstrated. The performance of transmitarray design using multilayer frequency selective surfaces (M-FSS) approach is carefully studied, and the transmission phase limit which are generally independent from the selection of a specific element shape is revealed. The maximum transmission phase range is determined based on the number of layers, substrate permittivity, and the separations between layers. In order to reduce the transmitarray design complexity and cost, three different methods have been investigated. As a result, one design is performed using quad-layer cross-slot elements with no dielectric material and another using triple-layer spiral dipole elements. Both designs were fabricated and tested at X-Band for deep space communications. Furthermore, the radiation pattern characteristics were studied under different feed polarization conditions and oblique angles of incident field from the feed. New design methodologies are proposed to improve the bandwidth of transmitarray antennas through the control of the transmission phase range of the elements. These design techniques are validated through the fabrication and testing of two quad-layer transmitarray antennas at Ku-band. A single-feed quad-beam transmitarray antenna with 50 degrees elevation separation between the beams is investigated, designed, fabricated, and tested at Ku-band. In summary, various challenges in the analysis and design of transmitarray antennas are addressed in this book. New methodologies to improve the bandwidth of transmitarray antennas have been demonstrated. Several prototypes have been fabricated and tested, demonstrating the desirable features and potential new applications of transmitarray antennas.

Signaling System #7, Sixth Edition

Signaling System #7, Sixth Edition

Author: Travis Russell Format: Hardback Release Date: 28/08/2014

Publisher's Note: Products purchased from Third Party sellers are not guaranteed by the publisher for quality, authenticity, or access to any online entitlements included with the product. THE MOST COMPLETE, CURRENT GUIDE TO SIGNALING SYSTEM #7 (SS7)Thoroughly updated to cover the latest advances in the telecommunications industry, Signaling System # 7, Sixth Edition, addresses the impact of emerging technologies and applications, such as Long Term Evolution (LTE) and 4G networks, on SS7. An all-new chapter onDiameter discusses how to successfully implement SS7-to-Diameter interfaces to bridge 3G and 4G networks. Real-world examples, protocol message details, call flows, and effective migration strategies are included in this practical guide. Comprehensive coverage includes: The SS7 network--international and national planes The OSI model SS7 protocols and the protocol stack Signal units Message Transfer Part (MTP), including level 3 Signaling Transport (SIGTRAN) ISDN User Part (ISUP) Signaling Connection Control Part (SCCP) Transaction Capabilities Application Part (TCAP) The evolution to Diameter

The little data book on information and communication technology 2014

The little data book on information and communication technology 2014

Author: World Bank Format: Paperback / softback Release Date: 30/06/2014

Management of Speech and Video Telephony Quality in Heterogeneous Wireless Networks

Management of Speech and Video Telephony Quality in Heterogeneous Wireless Networks

Author: Blazej Lewcio Format: Hardback Release Date: 21/11/2013

This book shows how networking research and quality engineering can be combined to successfully manage the transmission quality when speech and video telephony is delivered in heterogeneous wireless networks. Nomadic use of services requires intelligent management of ongoing transmission, and to make the best of available resources many fundamental trade-offs must be considered. Network coverage versus throughput and reliability of a connection is one key aspect, efficiency versus robustness of signal compression is another. However, to successfully manage services, user-perceived Quality of Experience (QoE) in heterogeneous networks must be known, and the perception of quality changes must be understood. These issues are addressed in this book, in particular focusing on the perception of quality changes due to switching between diverse networks, speech and video codecs, and encoding bit rates during active calls.

Constant Touch A Global History of the Mobile Phone

Constant Touch A Global History of the Mobile Phone

Author: Jon Agar Format: Hardback Release Date: 07/02/2013

Mobile phones are a ubiquitous technology with a fascinating history. There are now as many mobile phones in the world as there are people. We carry them around with us wherever we go. And while we used to just speak into them, now mobiles are used to do all kinds of tasks, from talking to twittering, from playing a game to paying a bill. Jon Agar takes the mobile to pieces, tracing what makes it work, and puts it together again, showing how it was shaped in different national contexts in the United States, Europe, the Far East and Africa. He tells the story from the early associations with cars and the privileged, through its immense popular success, to the rise of the smartphone. Few scientific revolutions affect us in such a day-to-day way as the development of the mobile phone. Jon Agar's deft history explains exactly how this revolution has come about - and where it may lead in the future.

OFDMA Mobile Broadband Communications A Systems Approach

OFDMA Mobile Broadband Communications A Systems Approach

Author: Junyi Li, Xinzhou Wu, Rajiv Laroia Format: Hardback Release Date: 17/01/2013

Written by the pioneers of Flash-OFDM, arguably the first commercially developed OFDMA-based mobile broadband system in the world, this book teaches OFDMA from first principles, enabling readers to understand mobile broadband as a whole. The book examines the key requirements for data-centric mobile; how OFDMA fits well with data networks; why mobile broadband needs to be IP-based; and how to bridge communications theory to real-world air interface design and make a good system choice between performance and complexity. It also explores the future of wireless technologies beyond conventional cellular architecture. One of the key challenges faced by newcomers to this field is how to apply the wireless communications theory and principles to the real world and how to understand sophisticated commercial systems such as LTE. The authors use their firsthand experience to help graduate students, researchers and professionals working on 4G to bridge the gap between theory and practice.

VoIP and Unified Communications Internet Telephony and the Future Voice Network

VoIP and Unified Communications Internet Telephony and the Future Voice Network

Author: William A. Flanagan Format: Paperback / softback Release Date: 06/03/2012

The new generation of voice services and telephony will be based on packet networks rather than TDM transmission and switching. This book addresses the evolution of telephony to Voice over IP (VoIP) and Unified Communications (UC), bringing email, voice mail, fax, and telephone services to one user interface. Concise and to the point, this text tells readers what they need to know to deal with vendors, network engineers, data center gurus, and top management with the confidence and clear understanding of how things really work. It serves as a useful tool for engineers just entering the field, as well as for experienced engineers and technical managers who want to deal effectively with sales people.

Plunkett's Telecommunications Industry Almanac Telecommunications Industry Market Research, Statistics, Trends & Leading Companies

Plunkett's Telecommunications Industry Almanac Telecommunications Industry Market Research, Statistics, Trends & Leading Companies

Author: Jack W. Plunkett Format: Paperback / softback Release Date: 23/08/2010

Plunkett's Telecommunications Industry Almanac is the only complete reference guide to the telecommunications technologies and companies that are changing the way the world communicates today. This massive reference book's market research section provides our famous trends analysis, as well as major statistical tables. You will receive an abundance of data on statistics, new telecommunications technologies, markets, the Internet, land lines, VOIP, unified communications and leading telecommunications companies. In the corporate profiles section, you'll receive vital details on the Telecommunications 500 Firms, the largest, most successful corporations in all facets of the telecommunications business on a worldwide basis, both public and private. These in-depth profiles include corporate names, addresses, phone and fax numbers, web sites, growth plans, competitive advantage, financial histories and up to 27 executive contacts by title. You will also find information regarding local exchange and long distance telephone service markets and trends, wireless and cellular telephone markets and trends, satellite telecommunications, Wi-Fi, telephone industry equipment, software and support. Purchasers will find a form in the book enabling them to register for 1-year, 1-seat online access to tools at Plunkett Research Online, including the ability to view the market research/industry trends section and industry statistics. You have access, at no additional charge, to the very latest data posted to Plunkett Research Online. Online tools enable you to search and view selected companies, and then export selected company contact data, including executive names. You'll find a complete overview, industry analysis and market research report in one superb, value-priced package.

The DVB-H Handbook The Functioning and Planning of Mobile TV

The DVB-H Handbook The Functioning and Planning of Mobile TV

Author: Jyrki T. J. Penttinen, Petri Jolma, Erkki Aaltonen, Jani Vare Format: Hardback Release Date: 11/12/2009

A guide to implementing the DVB-H system for the carriage of MobileTV services, The DVB-H Handbook provides an overview of all aspects of the specification. Placing particular emphasis on the technical elements, it includes important information on the signalling and service discovery. The background, functioning, planning and optimisation of DVB-H are systematically explained for use in network planning and optimization. Subjects such as coding, different modes for channel delivery and protection in core and radio system are detailed. Giving examples on the practical interpretation of the DVB-H specifications, this book also describes the process behind the realization of the end-to-end system. * Outlines the functioning, planning and optimization of the complete DVB-H system * Spans topics from physical network planning and link layer specifications, to application ingredients such as EPGs and audiovisual streaming technologies * Uses illustrations and selected case examples reflecting real-life practice to give greater understanding * Functions as an overview of the topic, as well as a tutorial for implementing the system * A must-read for beginners as well as established experts within the field of Mobile broadcasting

Alexander Graham Bell and the Telephone The Invention That Changed Communication

Alexander Graham Bell and the Telephone The Invention That Changed Communication

Author: Samuel Willard Crompton Format: Hardback Release Date: 15/01/2009

In 1876, Alexander Graham Bell uttered the words that would inaugurate a new era in human communication: 'Mr. Watson, come here, I want to see you'. Bell was speaking through his new invention: the telephone. Though his name is the first to be associated with this now ubiquitous device, Bell was not working in a vacuum or entirely on his own. The second half of the 19th century was a time of great innovation, during which many people were experimenting with various designs for machines to enable human communication over great distances. Bell was simply the first to win a patent. Alexander Graham Bell and the Telephone tells the story of the man who invented the telephone, the people who helped him, and the changes that came about because of one of the greatest inventions of all time.