1. School of Electrical Engineering, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
2. School of Electrical Engineering, Rajamangala University of Technology Rattanakosin, Nakhon Pathom 73170, Thailand
3. School of Electrical Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Suvarnabhumi, Nonthaburi 11000, Thailand
4. School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney 2052, Australia