1. Institute for Communications Engineering, Technical University of Munich, Munich, Germany
2. Department of Electrical Engineering and Information Technology, Technical University of Darmstadt, Darmstadt, Germany
3. Electrical and Computer Engineering Department and the Helen Diller Quantum Center, Technion—Israel Institute of Technology, Haifa, Israel
4. Chair of Theoretical Information Technology, Technical University of Munich, Munich, Germany
5. Institute for Digital Communications, Friedrich--Alexander University Erlangen--Nürnberg, Erlangen, Germany