Information and communication technology has gained immense importance in recent decades. Therefore, imparting fundamental knowledge in digital information transmission is becoming increasingly crucial. Current research areas such as multiple antenna systems (MIMO systems) and multi-user communication are based on information-theoretical approaches, as well as knowledge of coding theory, transmission technology, and estimation methods. This textbook focuses on efficient wireless transmission techniques, with particular emphasis on mobile communications. However, most principles and methods are also applicable in other areas of digital transmission technology and, to some extent, in storage technology.