1. Department of Electrical Engineering, Information Technology and Cybernetic, University of South-Eastern Norway, Notodden, Norway
2. Department of Electrical and Computer Engineering, Binghamton University, Binghamton, NY, USA
3. Department of Electrical and Computer Engineering, Hawassa University, Hawassa 05, Ethiopia
4. Department of Electrical and Electronic Engineering Technology, University of Johannesburg, Johannesburg, South Africa