1. Department of Telecommunications, Federal Institute of Santa Catarina, São José, Santa Catarina, Brazil
2. John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA
3. Department of Telecommunications, Aeronautics Institute of Technology, São José dos Campos, São Paulo, Brazil
4. Department of Communications, School of Electrical and Computer Engineering, Wireless Technology Laboratory, University of Campinas, Campinas, São Paulo, Brazil