This book introduces readers to the new interdisciplinary field of digital communications and interesting with the chaos. This idea seems simple spin hundreds of research papers, and many novel communication schemes based on chaotic signals have been proposed. This book describes the state of the art (both theoretical and experimental) of this novel field. This book is written by leading experts in the field of nonlinear dynamics and Electrical Engineering are participating in the U.S. Army sponsored Multi-University Research Initiative on Digital Communication using Nonlinear Dynamics.