[1] Jiangsu Teachers Univ Technol, Sch Elect & Informat Engn, Changzhou 213001, Peoples R China
[2] SW Jiaotong Univ, Sch Elect Engn, Chengdu 610031, Peoples R China
[3] Nanjing Univ Sci & Technol, Dept Elect Engn, Nanjing 210094, Peoples R China
[4] Changzhou Univ, Sch Informat Sci & Engn, Changzhou 213164, Peoples R China