[Kang, Xiatao;Li, Ping;Yao, Jiayi] Changsha Univ Sci & Technol, Sch Comp & Commun Engn, Changsha, Peoples R China.^[Li, Chengxi] Xidian Univ, Sch Comp, Xian, Peoples R China.^[Li, Ping] Hunan Prov Key Lab Intelligent Proc Big Data Tran, Changsha, Peoples R China.