1. Communications Engineering Lab, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
2. Division of Microelectronic Systems Design, University of Kaiserslautern-Landau, Kaiserslautern, Germany
3. Hochschule Koblenz, Koblenz Karthause, Koblenz, Germany
4. Institute of Telecommunications, University of Stuttgart, Stuttgart, Germany
5. Signal Processing for Communications Lab, Eindhoven University of Technology, Eindhoven, The Netherlands
6. Institute of Communications and Navigation of the German Aerospace Center (DLR), Wessling, Germany