1. Department of Telecommunication Systems, Bahauddin Zakariya University, Multan, Pakistan
2. Department of Electrical Engineering, University of Engineering and Technology, Lahore, Lahore, Pakistan
3. Escuela Politécnica Superior, Universidad de Alcalá, Alcalá de Henares, Spain
4. Electrical and Computer Engineering Department, King Abdulaziz University, Jeddah, Saudi Arabia