1. Bouira University, Algeria. E-mail: amad.mourad@gmail.com
2. LaMOS Research Unit, Bejaia University, Algeria. E-mail: lamos_bejaia@hotmail.com
3. IMT Lille Douai, Institut Mines-Télécom, France. E-mail: ahmed.meddahi@telecom-lille.fr
4. Bejaia University, Algeria. E-mails: merabet.aimed@gmail.com, sekhriou.noureddine@gmail.com