1. School of Telecommunications Engineering, State Key Laboratory of Integrated Services Networks, Xidian University, Xi’an, China
2. Center for Pervasive Communications and Computing, University of California at Irvine, Irvine, CA, USA
3. Department of Information and Electronic Engineering, Muroran Institute of Technology, Muroran, Japan
4. Department of Applied Informatics, Silesian University of Technology, Gliwice, Poland
5. Artificial Intelligence Research Institute, Shenzhen MSU-BIT University, Shenzhen, China