Introduction to Digital Communications, written especially for upper-level undergraduate courses, explores the basic principles in the analysis and design of digital communication systems, including design objectives, constraints and trade-offs. After portraying the big picture and laying the background material, this book lucidly progresses to a comprehensive and detailed discussion of all critical elements and key functions in digital communications. The second edition has been fully revised, with timely new chapters on wireless enabling systems and encryption, more practical examples, more application-focused real-world end of chapter exercises, and a more crisp and concise approach to the content. " Focuses exclusively on digital communications, with complete coverage of source and channel coding, modulation, and synchronization " Discusses major aspects of communication networks and multiuser communications " Provides insightful descriptions and intuitive explanations of all complex concepts " A companion website includes solutions to end-of-chapter problems and computer exercises, lecture slides, and figures and tables from the text New features in the second edition " Important new chapter on Wireless Enabling Technologies and Evolving Mobile Systems, covering 5G, WiFi, GPS, and Bluetooth standards as well as the MIMO, OFDM/OFDMA, and spread spectrum technologies " Timely new chapter on network security and cryptography " More practical examples added throughout " Enhanced coverage of signal space constellations, phase-locked loop, and link analysis