This text presents an introduction to electrical communication systems, including analysis methods, design principles and hardware considerations. The 4th edition has been completely updated to reflect current technology in this ever-evolving field. It is intended for an introductory communications course and is written at a level appropriate for advanced undergraduate and first-year graduate students. Both analog and digital communications are covered, and the book features worked examples and exercises for students to solve within chapters, helping them to master new concepts as they are introduced. The book now has a new chapter on spread spectrum, which includes multiple access methods and wireless systems, and a number of topics have been added or expanded, including: DSL (digital subscriber lines), computer networks, digital audio recording and turbo coding. The book will have an expanded website, which will include the password-protected solutions manual for the instructor and helpful material for the students.
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