1. Centre for Telecommunication Research & Innovation (CETRI), Faculty of Electrical and Electronic Engineering Technology (FTKEE), Universiti Teknikal Malaysia Melaka (UTeM), Melaka 76100, Malaysia
2. Faculty of Electrical and Electronic Engineering (FKEE), Universiti Tun Hussein Onn Malaysia (UTHM), 86400 Batu Pahat, Johor, Malaysia
3. James Watt School of Engineering, College of Science and Engineering, University of Glasgow, Glasgow, UK