1. Centre for Wireless Communications, University of Oulu, Oulu, Finland
2. Programa Institucional de Fomento a la I+D+i, Universidad Tecnológica Metropolitana, Santiago, Chile
3. Department of Electrical and Electronics Engineering, Federal University of Santa Catarina, Florianópolis, Brazil
4. Department of Electrical Engineering, State University of Londrina (UEL), Londrina, Brazil