1. School of Automation and Electronic Information, Xiangtan University, Xiangtan, China
2. School of Information Engineering, Shaoyang University, Shaoyang, China
3. School of Mechanical and Electrical Engineering, Guizhou Normal University, Guiyang, China
4. School of Physics and Electronics, Central South University, Changsha, China
5. School of Electrical, Electronic and Computer Engineering, The University of Western Australia, Perth, WA, Australia