1. Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education, Anhui University, Hefei, China
2. Information Materials and Intelligent Sensing Laboratory of Anhui Province, School of Electrical Engineering and Automation, Anhui University, Hefei, China
3. Department of Electromechanical Engineering, Faculty of Science and Technology, University of Macau, Taipa, China
4. Department of Engineering, King's College London, London, U.K.