"The fourth edition of Communication Systems introduces the analysis methods, design principles, and hardware considerations of both analog and digital communication systems. The text is written for advanced undergraduate and first-year graduate students in electrical and computer engineering.". "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 provide a solid overview of the basic topics and principles, especially in analog communications."--BOOK JACKET.