1. Centre for Wireless Communications, University of Oulu, Oulu, Finland
2. Department of Electronics and Telecommunications, Universidad Central “Marta Abreu” de Las Villas, Santa Clara, Cuba
3. Programa Institucional de Fomentoa la Investigación, Desarrollo e Innovación, Universidad Tecnológica Metropolitana, Santiago, Chile
4. Department of Electrical and Electronics Engineering, Federal University of Santa Catarina, Florianópolis, Brazil