1. Electrical Engineering Department, Federal University of Juiz de Fora, Juiz de Fora, Brazil
2. Electrical Engineering Department, Federal University of Paraná, Curitiba, Brazil
3. PEE/COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
4. Institute of Networked and Embedded Systems, Alpen-Adria University Klagenfurt, Klagenfurt, Austria