1. Universite Cote d’Azur, Laboratoire d’Electronique, Antennes et Telecommunications (LEAT), 06903 Sophia Antipolis, France
2. Centre National de Recherche Scientifique (CNRS), UMR7248, 06903 Sophia Antipolis, France
3. Faculty of Computer Engineering, University of Information Technology, VNU-HCM, Ho Chi Minh City 700000, Vietnam