1. Laboratory of Electrical Engineering, Mecatronic and Signal Treatment, National Advanced School of Engineering, University of Yaounde 1, Yaoundé, Cameroon;
2. Higher Technical Teachers' Training College of Ebolowa, University of Ebolowa, Ebolowa, Cameroon;
3. School of Engineering, University of Quebec in Abitibi-Temiscamingue (UQAT), Rouyn-Noranda, Canada;
4. Departement of Earth Science, University of Yaounde 1, Yaoundé, Cameroon;
5. Laboratory of Technologies and Applied Sciences, University of Douala, Douala, Cameroon;
6. Department of Electrical and Electronics Engineering, National Institute of Technology Delhi, Delhi, India