1. Department of Signal Theory and Communications, CommSensLab – UPC, Universitat Politècnica de Catalunya – BarcelonaTech, Barcelona, Spain
2. IEEC – Institut d’Estudis Espacials de Catalunya, Barcelona, Spain
3. Department of Physics, Universitat Politècnica de Catalunya – BarcelonaTech, Castelldefels, Spain
4. College of Engineering, UAE-University, Abu Dhabi, United Arab Emirates