1. Laboratory of Electronics and Signal Processing, Department of Physics, Faculty of Sciences, University of Dschang, P. O. Box 067 Dschang, Cameroon
2. Department of Electrical and Electronic Engineering, College of Technology, University of Buea, P. O. Box 63 Buea, Cameroon
3. Laboratory of Modeling of Physical Systems, Department of Physics, Faculty of Sciences, University of Dschang, P. O. Box 067 Dschang, Cameroon