Antonio Bandera1, Jorge Dias2,3, Markus Vincze4, Luis J Manso5. 1. Dpto. Tecnologia Electronica, ETSI Telecomunicacion, University of Malaga, 29071, Malaga, Spain. ajbandera@uma.es. 2. Universidade do Coimbra, Coimbra, Portugal. 3. Khalifa University, Abu Dhabi, UAE. 4. TU Wien, Vienna, Austria. 5. University of Extremadura, Caceres, Spain.