1. Department of Engineering and Architecture (DIA), University of Trieste, Trieste, Italy
2. Department of Electrical and Electronic Engineering (DIEE), University of Cagliari, Cagliari, Italy
3. National Inter-University Consortium for Telecommunications (CNIT), Florence, Italy
4. Functional Nanosystems, Italian Institute of Technology (IIT), Genoa, Italy
5. Department of Electrical, Electronics, and Computer Engineering (DIEEI), University of Catania, Catania, Italy