1. Department of Electrical and Computer Engineering, State Key Laboratory of Internet of Things for Smart City, University of Macau, Macau, China
2. Department of Electrical and Computer Engineering, State Key Laboratory of IoT for Smart City, Guangdong–Hong Kong–Macau Joint Laboratory for Smart Cities, University of Macau, Macau, China
3. School of Information Science and Technology, Dalian Maritime University, Dalian, China
4. School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China