The fourth edition of the popular Communication Systems introduces the analysis methods, design principles, and hardware considerations of both analog and digital communication sys- tems. The text is written for advanced undergraduate and first year graduate students in electri cal and computer engineering. With this edition, A. Bruce Carlson is joined by new co-authors Paul B. Crilly and Janet C. Rutledge.

Distinctive to the fourth edition is the position and treatment of probability, random signals, and noise that comes after the discussion of analog systems without noise. Numerous applications have been integrated into the text to help illustrate the concepts and their practical significance. While the book has been substantially updated with the latest technologies, it continues to pro vide a solid overview of the basic topics and principles, especially in analog communications.

Key Features Include:

Spread Spectrum-a brand new chapter (15) on spread spectrum, which includes multiple access methods and wireless systems, has been included.

Topic expansions and additions-many topics have been added or expanded: DSL (digital subscriber lines) including ADSL and ISDN, SONET, Computer Networks, including OSI and TCP/IP Protocols and data encryption; digital audio recording, HDTV and expanded treat ment of receivers, plus turbo coding, trellis coded modulation, and enhanced treatment of convolutional coding.

Examples, Exercises and Problems-new worked-out examples, exercises, and end-of-chap- ter problems have been added to help the reader master new concepts as they are intro- duced with continual reinforcement.

Enhanced Pedagogy-the book is designed to further the reader's understanding of the material with chapter outlines and stated learning objectives in every chapter (starting with chapter 2); key terms are in bold; optional topics are indicated with a star; and key concepts and theorems are boxed.

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