1 Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
2 School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, China
3 Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China
4 School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China
5 Science and Technology on Communication Security Laboratory, Institute of Southwestern Communication, Chengdu 610041, China
6 Department of Informatics and Computer Engineering, University of West Attica, Athens 12243, Greece
7 School of Electronic Engineering, Bangor University, Wales LL57 1UT, United Kingdom