[Cai, Shuo; He, Binyong; Wang, Weizheng; Yu, Fei] Changsha Univ Sci & Technol, Sch Comp & Commun Engn, Changsha 410114, Hunan, Peoples R China.
[Liu, Peng] Guangdong Univ Technol, Sch Comp, Guangzhou 510006, Guangdong, Peoples R China.
[Yin, Lairong] Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.
[Li, Bo] Chinese Acad Sci, Key Lab Silicon Device Technol, Inst Microelect, Beijing 100029, Peoples R China.