1. College of Electrical and Information Engineering, Hunan University, Changsha, China
2. Hunan University, Changsha, China
3. School of Electrical Engineering, Zhengzhou University, Zhengzhou, China
4. School of Automation, Central South University, Changsha, China
5. State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an, China
6. Helmholtz-Zentrum Dresden-Rossendorf, Helmholtz Institute Freiberg for Resource Technology, Freiberg, Germany
7. China University of Geosciences, Wuhan Hubei, China