1. School of Physics and Electrical Engineering, Fuyang Normal University, Fuyang, China
2. School of Control and Computer Engineering, North China Electric Power University, Baoding, China
3. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China
4. Institute of Advanced Technology, Nanjing University of Posts and Telecommunications, Nanjing, China
5. Department of Automation, Shanghai Jiao Tong University, Shanghai, China