Digital techniques are central to almost all modern telecommunications systems. The third edition of Digital Communications has retained both its comprehensive coverage and its balance between theory, applications and systems implementation. Its main aim is to develop the mathematical theory of signal processing and use this theory to describe modern digital communications. This text is geared towards students who already have a technical understanding of electrical engineering from their introductory years at university and who wish to focus on digital communications. It covers everything these students will need to know, including modern techniques. It is also suitable for professional engineers.