1. Institute of Information and Communication Technologies, Electronics and Applied Mathematics (ICTEAM); Université Catholique de Louvain (UCL); Place du Levant, 3, Maxwell Building B-1348 Louvain-la-Neuve Belgium
2. Faculty of Engineering, Department of Fundamental Electricity and Instrumentation; University of Gävle (HIG); SE-801 76 Gävle Sweden
3. Faculty of Engineering, Department of Electronics, Mathematics and Natural Sciences; University of Gävle (HIG); SE-801 76 Gävle Sweden