1. Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn Malaysia, Batu Pahat, Johor, Malaysia
2. Wireless Communication Centre, Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Skudai, Johor, Malaysia
3. Department of Electronic and Electrical Engineering, University College London, London, U.K.
4. Faculty of Engineering Technology, Universiti Tun Hussein Onn Malaysia, Jalan Panchor, Johor, Malaysia
5. Department of Electrical Engineering, College of Engineering at Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, Saudi Arabia