1. COPELABS, Lusófona University, Lisbon, Portugal
2. Department of Electrical Engineering, NOVA University of Lisbon, Lisbon, Caparica, Portugal
3. Technology Innovation Institute, Masdar City, Abu Dhabi, United Arab Emirates
4. Instituto de Telecomunicações, Lisboa, Portugal
5. Instituto de Telecomunicações, Instituto Superior Tecnico, University of Lisbon, Lisboa, Portugal