1. Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space, Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China
2. Nanjing University of Aeronautics and Astronautics, Nanjing, China
3. School of Cyber Science and Engineering, Southeast University, Nanjing, China
4. National Mobile Communications Research Laboratory, Southeast University, Nanjing, China
5. Department of Computer Science, Norwegian University of Science and Technology, Gjøvik, Norway