[Ning, Liangshuo] Hubei Univ, Fac Math & Comp Sci, Wuhan, Peoples R China.^[Ning, Liangshuo;Zhou, Long;You, Xinge] Wuhan Polytech Univ, Elect & Informat Engn Dept, Wuhan, Peoples R China.^[You, Xinge;Du, Liang;He, Zhengyu] Huazhong Univ Sci & Technol, Elect & Informat Engn Dept, Wuhan, Peoples R China.^[He, Zhengyu] Harbin Inst Technol, Shenzhen Grad Sch, Dept Comp Sci & Technol, Shenzhen, Peoples R China.