1. Institute of Electrical Control Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
2. Institute of Communications Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan
3. Department of Electrical Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
4. Engineering Product Development Pillar, Singapore University of Technology and Design, Tampines, Singapore
5. School of Electrical and Electronics Engineering, Nanyang Technological University, Jurong West, Singapore