1. IETR, University of Rennes 1; Campus Beaulieu - Bât.11D, #263, Av. Général Leclerc, CS 74205 Rennes Cedex 35042 France
2. IETR, INSA; 20 Avenue Buttes Des Coësmes Rennes 35043 France
3. Electrical and Computer Engineering Department; King Abdulaziz University; P.O. Box 80204 Jeddah 21589 Saudi Arabia
4. Innov'com Laboratory; SUPCOM, University of Carthage; Tunis Tunisia
5. Department of Electrical and Computer Engineering; University of Arizona; 1230 E. Speedway Blvd Tucson Arizona 85721