1. Department of Electrical Engineering, Universidad de Talca, Camino a los Niches Km. 1, Curicó 3344158, Chile
2. Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK
3. Electronics Engineering Department, Universidad Tecnica Federico Santa Maria, Valparaiso 2390123, Chile
4. Department of Electrical Engineering, University of Jaén, Campus Lagunillas s/n, Edificio A3, 23071 Jaén, Spain
5. Department of Electrical and Electronic Engineering, Universidad del Bío-Bío, Concepción 4051381, Chile