Combining theoretical knowledge and practical applications, this advanced-level textbook covers the most important aspects of contemporary digital communication systems. It focuses on the rules of functioning digital communication system blocks, starting with the performance limits set by the information theory. Drawing on information relating to turbo codes and LDPC codes, the text presents the basic methods of error correction and detection, followed by baseband transmission methods, and single- and multi-carrier digital modulations. The basic properties of several physical communication channels used in digital communication systems are explained, showing the transmission and reception methods on channels suffering from intersymbol interference. The case studies are a unique feature of this book, illustrating elements of the theory developed in each chapter. It provides a concise approach to digital communications, with practical examples and problems to supplement the text. · Elements of Information Theory. · Channel Coding. · Digital Baseband Transmission. · Digital Modulations of the Sinusoidal Carrier. · Properties of Communication Channels. · Digital Transmission on Channels Introducing Intersymbol Interference. · Spread Spectrum Systems. · Synchronization in Digital Communication Systems. · Multiple Access Techniques.