1. School of Communications and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing, China
2. 5G and 6G Innovation Centre (5GIC and 6GIC), Institute for Communication Systems (ICS), University of Surrey, Guildford, U.K.
3. Fujian Provincial Engineering Technology Research Center of Photoelectric Sensing Application, Key Laboratory of Optoelectronic Science and Technology for Medicine, Ministry of Education, Fujian Normal University, Fuzhou, China
4. College of Computer Science, Chongqing University, Chongqing, China
5. Department of Information Engineering and the Department of Mathematics, University of Padova, Padua, Italy