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.