1. CommSensLab-UPC, Department of Signal Theory and Communications, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain
2. Institut d’Estudis Espacials de Catalunya IEEC, Parc Mediterrani de la Tecnologia (PMT) Campus del Baix Llobregat, UPC, 08860 Castelldefels, Spain
3. College of Engineering, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates
4. School of Business, Colegio de Estudios Superiores de Administración—CESA, Bogotá 110311, Colombia