[Zhou, Rui;He, Hongyu] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.^[Zhou, Rui;Zhang, Kangshuai;Peng, Lei] Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen 518055, Peoples R China.^[Shu, Hongfeng;Liu, Qi] Shenzhen SmartC Technol Dev Grp Co Ltd, Shenzhen 518038, Peoples R China.