1. UAq EMC Laboratory, Department of Industrial and Information Engineering and Economics, University of L'Aquila, L'Aquila, Italy
2. Department of Information Engineering, Computer Science and Mathematics, University of L'Aquila, L'Aquila, Italy
3. School of Electrical Engineering and Computer Science, University of Ottawa, Ottawa, ON, Canada
4. Department of Electronics, Carleton University, Ottawa, ON, Canada
5. EMC Laboratory, Missouri University of Science and Technology, Rolla, MO, USA