[Tang, Qiang;Li, LinJiang;Wang, Jin;Tang, Bin] Changsha Univ Sci & Technol, Sch Comp & Commun Engn, Hunan Prov Key Lab Intelligent Proc Big Data Tran, Changsha 410114, Hunan, Peoples R China.^[Kim, Gwang-Jun] Chonnam Natl Univ, Dept Comp Engn, Gwangju 61186, South Korea.