[Fang, Jing; Jin, Jie; Chen, Chaoyang] Hunan Univ Sci & Technol, Sanya Inst, Sanya 572024, Hainan, Peoples R China.
[Fang, Jing; Jin, Jie; Chen, Chaoyang; Jin, J; Li, Zhijing; Fang, J] Hunan Univ Sci & Technol, Sch Informat & Elect Engn, Xiangtan 411201, Hunan, Peoples R China.
[Jin, Jie; Jin, J] Changsha Med Univ, Sch Informat Engn, Changsha 410219, Hunan, Peoples R China.
[Yu, Fei] Changsha Univ Sci & Technol, Sch Comp & Commun Engn, Changsha 410114, Hunan, Peoples R China.