1. Higher Institute of the Sahel, Department of Renewable Energy, University of Maroua, P.O. Box 46, Maroua, Cameroon
2. National Advanced School of Engineering, Energy and Automatic Laboratory, University of Yaounde I, P.O. Box 8390, Yaounde, Cameroon
3. Higher Institute of the Sahel, Department of Information and Telecommunication, University of Maroua, P.O. Box 46, Maroua, Cameroon
4. Ecole Polytechnique Montreal, Polygrames Laboratory, P.O. Box 2500, Chemin Montreal, M6106, Canada H3T 1J4