1. Federal Technology University of Paraná (UTFPR); Cornélio Procópio; Brazil
2. Department of Telecommunications and Control Engineering, Escola Politécnica; University of São Paulo; São Paulo; Brazil
3. Department of Electrical and Computer Engineering; University of California-San Diego; San Diego; CA; USA
4. Department of Electrical Engineering; State University of Londrina; Londrina; Paraná; Brazil