1. Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece
2. Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas, Heraklion, Greece
3. Department of Electronics and Nanoengineering, Aalto University, Aalto, Finland
4. Department of Electrical and Computer Engineering, University of Cyprus, Nicosia, Cyprus
5. Department of Electrical and Computer Engineering, University of Massachusetts Amherst, Amherst, MA, USA
6. System Integration and Interconnection Technologies, Fraunhofer IZM, Berlin, Germany
7. Institute of Computer Science, Foundation for Research and Technology Hellas, Heraklion, Greece