Resultados de Pesquisa

INGLÊS

Fiber Optics - Technology And Applications

de Stewart D. Personick

118,59€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This book is an outgrowth of a course given by the author for people in industry, government, and universities wishing to understand the implica- tions of emerging optical fiber technology, and how this technology can be applied to their specific information transport and sensing system needs.
INGLÊS

Digital Phase Modulation

de Carl-Erik Sundberg, John B. Anderson e Tor Aulin

436,59€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 The last ten years have seen a great flowering of the theory of digital data modulation. This book is a treatise on digital modulation theory, with an emphasis on these more recent innovations. It has its origins in a collabor ation among the authors that began in 1977. At that time it seemed odd to us that the subjects of error-correcting codes and data modulation were so separated; it seemed also that not enough understanding underlay the mostly ad hoc approaches to data transmission. A great many others were intrigued, too, and the result was a large body of new work that makes up most of this book. Now the older disciplines of detection theory and coding theory have been generalized and applied to the point where it is hard to tell where these end and the theories of signal design and modulation begin. Despite our emphasis on the events of the last ten years, we have included all the traditional topics of digital phase modulation. Signal space concepts are developed, as are simple phase-shift-keyed and pulse-shaped modulations; receiver structures are discussed, from the simple linear receiver to the Viterbi algorithm; the effects of channel filtering and of hardlimiting are described. The volume thus serves well as a pedagogical book for research engineers in industry and second-year graduate students in communications engineering. The production of a manageable book required that many topics be left out.
INGLÊS

Introduction To Communication Science And Systems

de Edward C. Posner e John R. Pierce

171,59€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 There are many valuable and useful books on electrical communication (References 1-5 are some examples), but they have certain disadvantages for the beginner. The more advanced books present some things in a basic way, but they are very narrow for an introduction to communica tion. The introductory books are broader but still narrow by our stan dards. Further, they often pick things out of thin air rather than derive them. This book is aimed at giving the beginner a basic understanding of a wide range of topics which are essential in communication systems. These include antennas and transmission, thermal noise and its consequences, Fourier transforms, modulation and noise, sampling and pulse code modulation, autocorrelation and power spectrum, optimum filtering, gauss ian noise and errors in digital transmission, data transmission, limits on data rate including information theory and quantum limits, and source encoding. We have not included communications traffic, switching, and multiplexing, nor protocols for digital and computer communications. For these, Reference 6 is excellent. In general, our book does not discuss the circuits used for communication or the physics of radio propagation. We assume that these will be taught in specialized courses, but such courses are not prerequisites for this one. Chapter 1 introduces the transmission formula or antenna equation and antenna directivity. Only a very basic sophomore physics knowledge of electromagnetic theory is assumed. The radar equation is also treated.
INGLÊS

Synchronization Techniques For Digital Receivers

de Umberto Mengali

441,23€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Synchronization is a critical function in digital communications; its failures may have catastrophic effects on the transmission system performance. Furthermore, synchronization circuits comprehend such a large part of the receiver hardware that their implementation has a substantial impact on the overall costs. For these reasons design engineers are particularly concerned with the development of new and more efficient synchronization structures. Unfortunately, the advent of digital VLSI technology has radically affected modem design rules, to a point that most analog techniques employed so far have become totally obsolete. Although digital synchronization methods are well established by now in the literature, they only appear in the form of technical papers, often concentrating on specific performance or implementation issues. As a consequence they are hardly useful to give a unified view of an otherwise seemingly heterogeneous field. It is widely recognized that a fundamental understanding of digital synchronization can only be reached by providing the designer with a solid theoretical framework, or else he will not know where to adjust his methods when he attempts to apply them to new situations. The task of the present book is just to develop such a framework.
INGLÊS

Optical Channels - Fibers, Clouds, Water, And The Atmosphere

237,84€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 When we were first approached by Dr. Lucky to write this book we were very enthusiastic about the prospect, since we had contemplated a similar project for quite some time. The difficulty lay in how best to digest the vast amount of data on optical propagation, reduce it to a book of manageable size, and simultaneously form the transition from the physics of propagation to the engineering of optical channels. This is the intent of Optical Channels. In accomplishing our goal it was necessary to condense the material on optical propagation and, in so doing, we have left a large amount to be handled via references. We have tried to make these decisions in a consistent manner so that the book will be uniform in its treatment of this topic. We identify four channels for consideration: the free-space channel, which: is characteristic of a tranquil atmosphere or a space-to-space link; the turbulent channel, which is characteristic of the atmospheric channel; the scatter channel in two forms, clouds and water; and the fiber optic channel. For each of these channels we have tried to reduce the applicable propagation theory to a level that can be used for engineering design. This has been done by example, but here again decisions had to be made on which examples to present. We have not tried to present any material on optical components and consequently other references on engineering would be necessary to supplement this book.
INGLÊS

Communication System Design Using Dsp Algorithms - With Laboratory Experiments For The Tms320c30

de Steven A. Tretter

59,61€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Designed for senior electrical engineering students, this textbook explores the theoretical concepts of digital signal processing and communication systems by presenting laboratory experiments using real-time DSP hardware. Each experiment begins with a presentation of the required theory and concludes with instructions for performing them.
INGLÊS

Modeling And Analysis Of Computer Communications Networks

de Jeremiah F. Hayes

59,61€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 In large measure the traditional concern of communications engineers has been the conveyance of voice signals. The most prominent example is the telephone network, in which the techniques used for transmission multiplex ing and switching have been designed for voice signals. However, one of the many effects of computers has been the growing volume of the sort of traffic that flows in networks composed of user terminals, processors, and peripherals. The characteristics of this data traffic and the associated perfor mance requirements are quite different from those of voice traffic. These differences, coupled with burgeoning digital technology, have engendered a whole new set of approaches to multiplexing and switching this traffic. The new techniques are the province of what has been loosely called computer communications networks. The subject of this book is the mathematical modeling and analysis of computer communications networks, that is to say, the multiplexing and switching techniques that have been developed for data traffic. The basis for many of the models that we shall consider is queueing theory, although a number of other disciplines are drawn on as well. The level at which this material is covered is that of a first-year graduate course. It is assumed that at the outset the student has had a good undergraduate course in probability and random processes of the sort that are more and more common among electrical engineering and computer science departments.
INGLÊS

Digital Pictures - Representation And Compression

de Arun Netravali

171,59€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Representation and Compression.
INGLÊS

Computer Network Architectures And Protocols

171,59€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Such computer networks are playing an increasing role in our daily lives, somewhat indirectly up to now as the hidden servants of banks, retail credit bureaus, airline reservation offices, and so forth, but soon they will become more visible as they enter our offices and homes and directly become part of our work, entertainment, and daily living.
INGLÊS

Simulation Of Communication Systems

de K. Sam Shanmugan, Michel C. Jeruchim e Philip Balaban

95,40€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Simulation may be defined as the discipline whose objective is to imitate one or more aspects of reality in a way that is as close to that reality as possible; indeed, an apt synonym that is gaining some currency is artificial reality. Under this definition, simulation is a very old discipline. Probably the first applications of simulation were to scale models of various types of dynamical structures or mechanical devices. Man has always looked for ways to "try things out" before building the real thing; this is the motivation behind any form of simulation. Thus, simulation of communication systems is concerned with imitating some aspects of the behavior of communication systems. It is implicit in our use of simulation that the medium (so to speak) for carrying it out is the digital computer. Computer-based modeling and simulation of communication systems has only developed in the last 20 years or so, since the advent of modern digital computers. A variety of modeling and simulation techniques have been developed and described in widely scattered journals, but until now there has not been a single volume devoted to the subject. We have tried to provide a unified framework that describes both the disciplines involved and the methods of modeling and simulating communication systems and subsystems. In the electronic era, the first type of computer simulation, in today''s use of the term, took shape in the form of analog computers.
INGLÊS

Data Communications Principles

de Jeremiah F. Hayes, Richard D. Gitlin e Stephen B. Weinstein

237,84€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This unique text, for both the first year graduate student and the newcomer to the field, provides in-depth coverage of the basic principles of data communications and covers material which is not treated in other texts, including phase and timing recovery and echo cancellation.
INGLÊS

Data Transportation And Protection

de John E. Hershey e Rao K. Yarlagadda

59,61€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 A new breed of engineer is developing in our contemporary society. These engineers are concerned with communications and computers, economics and regulation. These new engineers apply themselves to data-to its pack aging, transmission, and protection. They are data engineers. Formal curricula do not yet exist for their dedicated development. Rather they learn most of their tools "on the job" and their roots are in computer engineering, communications engineering, and applied mathe matics. There is a need to draw relevant material together and present it so that those who wish to become data engineers can do so, for the betterment of themselves, their employer, their country, and, ultimately, the world-for we share the belief that the most effective tool for world peace and stability is neither politics nor armaments, but rather the open and timely exchange of information. This book has been written with that goal in mind. Today numerous signs encourage us to expect broader information exchange in the years to come. The movement toward a true Integrated Services Digital Network (ISDN) is perhaps the clearest of these. Also, the development offormal protocol layers reflects both a great deal of brilliance and compromise and also the desire for a common language among data engineers.
INGLÊS

Computer Network Architectures And Protocols

59,61€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 This is a book about the bricks and mortar from which are built those edifices that will permeate the emerging information society of the future-computer networks. The study of how computer networks function is a combined study of communication theory and computer science, two disciplines appearing to have very little in common.
INGLÊS

Telecommunications Switching

de J. Gordon Pearce

118,59€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 The motivation for this book stems from an early exposure to the book Ap- plied Mechanics by John Perry. The reader should not need to be able to derive formulas in order to apply them just as, to quote Professor Perry, "He should not have to be able to design a watch in order to tell time ...
INGLÊS

Error-Correction Coding For Digital Communications

de George C. Clark Jr. e J. Bibb Cain

264,34€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Error-correction coding is being used on an almost routine basis in most new communication systems. Not only is coding equipment being used to increase the energy efficiency of communication links, but coding ideas are also providing innovative solutions to many related communication problems.
INGLÊS

Introduction To Photonic Switching Fabrics

de H. Scott Hinton

171,59€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 In response to the interest in developing photonic switching fabrics, this book presents an overview of the various technologies from a systems designer's perspective. This title discusses optically transparent devices, optical logic devices, and optical hardware and set into a systems context. It provides a foundation for the field.
INGLÊS

Introduction To Broadband Networks - Lans, Mans, Atm, B-Isdn, And Optical Networks For Integrated Multimedia Telecommunications

de Anthony S. Acampora

171,59€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Focuses on the fundamentals of operation, architectures, performance management, and protocols of integrated broadband networks capable of supporting voice, data, image, and video telecommunication transport and services. This book offers an introduction to the field for systems designers, hardware and software engineers, and R&D managers.
INGLÊS

Deep Space Telecommunications Systems Engineering

171,59€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 In deep space, communications propagation is good, relative to terrestrial communications, and there is an opportunity to press toward the mathematical limit of microwave communication. Communication capability measured in 18 bits per second at a given range rose by a factor of 10 in the 19 years from Explorer I of 1958 to Voyager of 1977.
INGLÊS

Basic Concepts In Information Theory And Coding - The Adventures Of Secret Agent 00111

de Robert A. Scholtz, Robert E. Peile e Solomon W. Golomb

264,34€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Provides an exposition of the implications and interpretations of the fundamentals of discrete information theory and coding. Focusing on the results of practical applications, this text covers information measures, Shannon's channel capacity/coding theorems, and source and channel coding concepts.
INGLÊS

Fundamentals Of Digital Switching

118,59€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Since the publication of the first edition of Fundamentals of Digital Switching in 1983, there has been substantial improvement in digital switching technology and in digital networks. Packet switching has advanced from a low-speed data-oriented switching approach into a robust broadband technology which supports services ranging from low-speed data to video. This technology has eclipsed the flexibility of circuit switching. Fiber optic cable has advanced since the first edition and has substantially changed the technology of transmission. to research in optical devices to find a still better means of This success has led switching. Digital switching systems continue to benefit from the 100-fold improvement in the capabilities of semiconductor devices which has occurred during the past decade. The chip industry forecasts a similar escalation in complexity during the next 10 years. Networks of switching systems have changed due to regulatory policy reform in many nations, including the breakup of the Bell System in the United States, the introduction of new types of carriers in Japan, competition in the United Kingdom, and a reexamination of public policy in virtually all nations. Standards bodies have been productive in specifying new capabilities for future networks involving interactive and distributive services through STM and A TM technologies.
INGLÊS

Practical Computer Data Communications

de William J. Barksdale

59,61€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Several years ago when I began consulting full time, I quickly discovered that despite three advanced academic degrees my practical industrial experience had some significant gaps. It thus was necessary initially to spend considerable (nonbillable) time collecting and organizing a great deal of essential information on the various aspects of modern data communica tions. The task was made more difficult by the highly interdisciplinary nature of the field, with the required information scattered throughout the vast international literature of telecommunications, computers, electrical engineering, military systems, mathematics, operations research, optimiza tion, speech processing, and the murky world oflegal and regulatory policy. Although there were a number of fine books and periodicals in each of these specialized disciplines, I was unable to find a single comprehensive text that covered the entire field at even a modestly attractive technical and mathematical level. After going to the trouble of organizing all this diverse material for my clients and students, it seemed rather natural to put it into book form and thus share it with those professionals working with computer data communi cations who need a comprehensive coverage of the subject at a level immediately applicable to their work and yet easily accessible for self-study. The project was facilitated by an agreeable publisher and an incredibly understanding and cooperative family, and Practical Computer Data Com munications is the result.
INGLÊS

Modern Telecommunication

de E. Bryan Carne

59,61€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Organized society depends on communication of all kinds, including the ability to communicate at a distance, instantaneously. With the development of solid state electronics and its application to digital processing, telecommunication has become extremely important to large segments of American business. The in troduction of competition to serve these voice, data, and video needs has ex panded the number of service options available, and some of them are finding their way into the residential sector. From a relatively stable, mature industry, telecommunication has rapidly become a technology-driven marketplace in which a host of companies are competing for customer attention with new services and equipment. Heretofore, books on telecommunications have addressed facilities and how they work. In this book, I am seeking to provide a much broader perspective which includes information on the motives driving the business itself, on new media and services, and on advancing technologies, as well as on digital facilities and their integration into the environment of future businesses and households. Covering so wide a set of topics presents many problems, not the least of which is that the character of the information is different in each chapter, and the material will be read by persons skilled in disparate fields. It is possible to read each chapter by itself-although a reading of all of them is needed to understand the new dimensions being introduced into the telecommunication experience.
INGLÊS

Fundamentals Of Digital Switching

95,40€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 The development of low-cost digital integrated circuits has brought digital switching from a concept to an economic reality. Digital switching systems have now found worldwide acceptance and there are very few new switch ing systems being considered either for design or application which are not digital. Digital technology has created new opportunities for innovation including the integration of digital transmission and switching, the combi nation of voice and data services in one switching entity, and the design of switching systems which are economical over a broad range of sizes. In the strict sense, the term "digital switching" refers to a system which establishes a message channel between two terminations where infor mation is represented in digital form. In more common usage, a digital switch usually contains a time-divided network composed of logic gates and digital memory to accomplish the switching function. The intent of this book is to provide an introductory level explanation of the principles of digital switching. These principles apply to both public and PABX switching. The book is aimed at those who apply, design, main tain, or simply wish to understand digital switching techniques. An electri cal engineering degree is definitely not required for comprehension. We have concentrated on explaining digital switching techniques without the use of detailed mathematics. However, each chapter contains a comprehen sive list of references which will lead the reader to sources for a more in-depth study of the many subjects covered.
INGLÊS

Computer Communications And Networks

de John R. Freer

59,61€ + 10% EM CARTÃO

DISPONIBILIDADE IMEDIATA

 Computer communications is one of the most rapidly developing technologies and it is a subject with which everyone in the computer systems profession should be familiar. Computer communications and networks is an introduction to communications technology and system design for practising and aspiring computer professionals.
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