John R. Barry – författare

Intended for designers and would-be designers of digital communication systems, this text extracts the common principles underlying a range of media and applications and presents them in a unified framework. Specifically, it treats the transport of bit streams from one geographical location to another over various physical media, such as wire pairs, coaxial cable, optical fibre and radio. It also treats multiple-access channels, where there are potentially multiple transmitters and receivers sharing a common medium. "Digital Communication" is relevant to the design of a variety of systems, including voice and video digital cellular telephone, digital CATV distribution, wireless LANs, digital subscriber loop, metallic ethernet, voiceband data modems and satellite communication systems. In this Third Edition material on recent advances in wireless communications, error-control coding and multiuser communications has been added. As a result, two chapters have been added, one on the theory of MIMO channels, and the other on diversity techniques for mitigating fading. The treatment of error-control coding has been rewritten to reflect the current state of the art in 2003.Chapters 6 through 9 from the Second Edition have been reorganized and streamlined to highlight pulse-amplitude modulation, becoming the new chapters 5 through 7. Readability has been increased by relegating many of the more detailed derivations to appendices and exercise solutions, both of which are included in the book. Exercises, problems, and solutions have been revised and expanded.

This text provides a comprehensive description of the technical challenges inherent in wireless communications using diffuse infrared radiation. The potential for broadband data rates has sparked an explosion of recent research in wireless infrared communications. The focus is on the physical layer problem of establishing a robust point-to-point link. The author explores the fundamental limitations of the medium, identifies the dominant impediments to achieving high data rates, and proposes design strategies to counter them. The text introduces the reader to a wide range of topics, including optical design, multipath propagation, electronics design, modulation, and equalization. It should be a useful reference for both design engineers and communications theorists, and can also be used as a text for advanced courses on the subject.

This book concerns digital communication. Specifically, we treat the transport of bit streams from one geographical location to another over various physical media, such as wire pairs, coaxial cable, optical fiber, and radio. We also treat multiple-access channels, where there are potentially multiple transmitters and receivers sharing a common medium. Ten years have elapsed since the Second Edition, and there have been remarkable advances in wireless communication, including cellular telephony and wireless local-area networks. This Third Edition expands treatment of communication theories underlying wireless, and especially advanced techniques involving multiple antennas, which tum the traditional single-input single-output channel into a multiple-input multiple-output (MIMO) channel. This is more than a trivial advance, as it stimulates many advanced techniques such as adaptive antennas and coding techniques that take advantage of space as well as time. This is reflected in the addition of two new chapters, one on the theory of MIMO channels, and the other on diversity techniques for mitigating fading. The field of error-control coding has similarly undergone tremendous changes in the past decade, brought on by the invention of turbo codes in 1993 and the subsequent rediscovery of Gallager's low-density parity-check codes. Our treatment of error-control coding has been rewritten to reflect the current state of the art. Other materials have been reorganized and reworked, and three chapters from the previous edition have been moved to the book's Web site to make room.