1. School of Information and Electronics, Beijing Institute of Technology, Beijing, China
2. MIIT Key Laboratory of Complex-Field Intelligent Sensing, Beijing Institute of Technology, Beijing, China
3. School of Computing and Digital Technology, Birmingham City University, Birmingham, U.K.
4. Baicells Technologies Co. Ltd., Beijing, China
5. Queen's University Belfast, Belfast, U.K.
6. University of Surrey, Guildford, U.K.
7. Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany