1. College of Computer Science and Electronic Engineering, Hunan University, Changsha, China
2. School of Communications and Information Engineering, Nanjing University of Posts and Telecommunications, Nanjing, China
3. School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo, China
4. School of Space Information, Space Engineering University, Beijing, China
5. Department of Electrical Engineering, Qatar University, Doha, Qatar
6. Department of Digital Industry Technologies, National and Kapodistrian University of Athens, Athens, Greece