1. National Institute of Telecommunications, Santa Rita do Sapucaí, Brazil
2. Centre of Wireless Communications (CWC), University of Oulu, Oulu, Finland
3. Instituto Universitario de Investigación y Desarrollo Tecnológico, Universidad Tecnológica Metropolitana, Santiago, Chile
4. Department of Electrical and Electronics Engineering, Federal University of Santa Catarina, Florianópolis, Brazil