1. School of Electronics and Information, Northwestern Polytechnical University, Xi’an, China
2. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing, China
3. Electrical Engineering Department, École de Technologie Supérieure, Université du Québec, Montréal, QC, Canada
4. Department of Information Systems, College of Computer and Information Sciences, King Saud University, Riyadh, Saudi Arabia
5. Global Information and Telecommunication Institute, Waseda University, Shinjuku, Tokyo, Japan