1. School of Electrical Engineering and Automation, Fuzhou University, Fuzhou, China
2. Department of Information and Telecommunication, Guilin University of Electronic Technology, Guilin, China
3. Department of Electronic Engineering, National Ilan University, Yilan, Taiwan
4. Department of Electrical Engineering, Yuan Ze University, Taoyuan, Taiwan
5. Department of Electrical and Computer Engineering, Louisiana State University, Baton Rouge, LA, USA