1. COPELABS, Lusófona University, 1700-097 Lisbon, Portugal
2. Centro de Investigaçäo em Tecnologias—Autónoma TechLab, Universidade Autónoma de Lisboa, 1169-023 Lisbon, Portugal
3. Department of Electrical & Electronics Engineering, Faculty of Engineering, Sri Lanka Institute of Information Technology, Malabe 10115, Sri Lanka
4. Department of Electronics and Communications Engineering, National Institute of Technology, Tiruchirappalli 620015, India