This book was written by leading experts in the field of 5G mobile communications. The contents are based on several deliverables of the European Union (EU) project, Mobile and Wireless Communication Enablers for the Twenty-Twenty Information Society (METIS), which was accomplished between 2012 and 2015 by 25 companies and institutions from all over Europe. After a short introduction in Chapter 1, the following 13 chapters reflect the results of the work packages of the METIS project. The book may be a good starting point to become acquainted with novel transmission techniques and networking solutions proposed for 5G system. Nearly 600 references will help the interested reader dive deeper into a specific topic. It may also serve as a valuable source of information for graduate students specializing in mobile communications. I can truly recommend this book to the entire wireless communication community.