1. Department of Electronics, Information and Bioengineering, Politecnico di Milano, Milano, Italy
2. National Institute of Information and Communication Technology (NICT), Tokyo, Japan
3. University of Stuttgart, Stuttgart, Germany
4. Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institute, Berlin, Germany
5. Prysmian Group, Milano, Italy
6. University of L'Aquila and CNIT, L'Aquila, Italy