Textbook in PDF format The textbook covers digital communication systems, in both theory and application. The authors present a complete, up-to-date coverage on the principles of digital communications. The book covers a broad range of topics in digital communications, with emphasis on connecting fundamental concepts of digital signal and communication theory and offers the instructors a certain flexibility for teaching the course. The text covers signal analysis, probability and stochastic processes, analog-to-digital conversion techniques, modulation theory using stochastic processes, digital modulation spectra and probability of error, information and coding theory, and computer networks. Several examples and illustrations are included to help the reader develop an intuitive idea of the theory. In addition to acting as a core title for classes in digital communications, the book also can be included in classes in digital networks, information theory and coding, or digital modulation theory. Modulation theory is dealt with using stochastic processes, which remains a novel approach for undergraduate texts. The book is suitable for the undergraduate as well as the initial graduate levels of electrical, electronic or communications engineering courses