[Le Ou-Yang] Shenzhen Univ, Coll Informat Engn, Shenzhen 518060, Peoples R China.^[Le Ou-Yang;Yan, Hong] City Univ Hong Kong, Dept Elect & Engn, Hong Kong, Hong Kong, Peoples R China.^[Zhang, Xiao-Fei] Cent China Normal Univ, Sch Math & Stat, Wuhan 430079, Peoples R China.^[Zhang, Xiao-Fei] Cent China Normal Univ, Hubei Key Lab Math Sci, Wuhan 430079, Peoples R China.