1. Faculty of Engineering, Al Neelain University, Khartoum 11121, Sudan
2. Telecommunication Engineering Department, Mashreq University, Khartoum North 13317, Sudan
3. Faculty of Electronic Engineering and Technology, Universiti Malaysia Perlis, Arau 02600, Perlis, Malaysia
4. Centre of Excellence Advanced Communication Engineering (ACE), Universiti Malaysia Perlis, Arau 02600, Perlis, Malaysia