1. Centre of Advanced Electronic and Communication Engineering, Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi Selangor, Malaysia
2. International Center for Theoretical Physics, Trieste, Italy
3. Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Kuala Lumpur, Malaysia
4. Department of Electrical Engineering, Qatar University, Doha, Qatar