1. Instituto de Telecomunicações, Leiria, Portugal
2. Group of Electronics and Applied Electromagnetics (GEAE), Federal University of São João Del-Rei, Ouro Branco, Brazil
3. Department of Telecommunications Engineering, Fluminense Federal University (UFF), Rio de Janeiro, Brazil
4. National Institute of Metrology, Quality and Technology (Inmetro), Brasília, Brazil
5. Center of Telecommunication Studies (CETUC/PUC-Rio), Rio de Janeiro, Brazil