1. Chengdu, China, 610065 (e-mail: sy_uaena@163.com)
2. College of Electrical Engineering, Sichuan University, 12530 Chengdu, Sichuan, China, 610065 (e-mail: scufrankwang@163.com)
3. College of Electrical Engineering and Information Technology, Sichuan University, Chengdu, China, 610065 (e-mail: xiaoxianyong@163.com)
4. Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada, T6G 2V4 (e-mail: wxu@ualberta.ca)
5. AltaLink, Calgary, Canada, (e-mail: CarlYunfei.Wang@AltaLink.ca)