1. Faculty of Electronic Engineering & Technology, Universiti Malaysia Perlis (UniMAP), Arau 02600, Malaysia
2. Advanced Communication Engineering Centre of Excellence (ACE), Universiti Malaysia Perlis (UniMAP), Kangar 01000, Malaysia
3. Centre for Wireless Communications (CWC), University of Oulu, 90014 Oulu, Finland
4. Faculty of Industrial Education and Technology, Rajamangala University of Technology Srivijaya, Songkhla 90000, Thailand