1. State Key Laboratory of Industrial Control Technology, Institute of Cyber-Systems and Control; Zhejiang University; Hangzhou, 310027 P.R. China
2. Laboratoire des Signaux et Systèmes, CNRS-Supelec, Plateau du Moulon; 91192 Gif-sur-Yvette France
3. Advanced Control Systems Laboratory of School of Electronics and Information Engineering; Beijing Jiaotong University; Beijing 100044 P.R. China