Vlad Andrei, Aladin Djuhera, Xinyang Li, Technical University of Munich, Germany; Tuomas Määtä, Janne Mustaniemi, Niklas Vaara, Praneeth Susarla, University of Oulu, Germany; Ullrich Mönich, Technical University of Munich, Germany; Miguel Bordallo Lopez, Holger Boche, University of Oulu, Finland; Ahmed Alkhateeb, Arizona State University, United States