This text/reference book aims to present a comprehensive introduction to the theory of random processes with emphasis on its practical applications to signals and systems. The author shows how to analyze random processes - the signals and noise of a communication system. He also shows how to achieve results in their use and control by drawing on probabilistic concepts and the statistical theory of signal processing. This second edition adds over 50 worked exercises for students and professionals, as well as an additional 100 standard exercises. Recent advances in random process theory and application have been added.