1. School of Electronic Engineering, Sudan University of Science and Technology,Khartoum,Sudan
2. Taif University,Department of Computer Engineering College of Computers and IT,Taif,Saudi Arabia
3. Intl. Islamic University Malaysia,Dept. of Elect & Electronics Eng.,Kuala Lumpur,Malaysia
4. School of Electrical, Computer, Telecommunication Engineering, University of Wollongong,Wollongong,Australia
5. International Islamic University Malaysia,Department of Electrical and Computer Engineering,Kuala Lumpur,Malaysia