1. State Key Laboratory of Internet of Things for Smart City, Department of Computer and Information Science, University of Macau, Taipa, Macau, China
2. College of Information Engineering, Zhejiang University of Technology, Hangzhou, China
3. School of Cyber Science and Engineering, Xi'an Jiaotong University, Xi'an, China
4. Department of Communication Engineering, Dalian Maritime University, Dalian, China
5. Department of Electrical and Computer Engineering, Tennessee Tech University, Cookeville, TN, USA