1. Tshwane University of Technology, Faculty of Engineering and Built Environment, Department of Electrical Engineering and FSATI, X680 Staatsartillerie, Pretoria, 0001, South AfricabTelkom South Africa, 152 Proes Street, Pretoria, 0001, South Africa
2. University of Namibia, Faculty of Engineering and Information Technology, Department of Electronics and Computer Engineering, Jose Eduardo dos Santos Campus, P.O. Box 3624, Ongwediva, Namibia
3. Tshwane University of Technology, Faculty of Engineering and Built Environment, Department of Electrical Engineering and FSATI, X680 Staatsartillerie, Pretoria, 0001, South Africa