1. Graduate Program in Electrical Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Belo Horizonte 31270-901, MG, Brazil
2. Department of Telecommunications and Mechatronics Engineering, Universidade Federal de São João del-Rei, Rod. MG 443 Km 7, Ouro Branco 36420-000, MG, Brazil
3. Departament of Electrical Engineering, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Belo Horizonte 31270-901, MG, Brazil