1. Key Laboratory of Dynamic Cognitive System of Electromagnetic Spectrum Space, College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China
2. National Mobile Communications Research Laboratory, Southeast University, Nanjing, China
3. Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, USA
4. Department of Electrical and Information Technology, Lund University, Lund, Sweden
5. Department of Radio Systems, Faculty of Electrical Engineering Computer Science and Mathematics (EEMCS), University of Twente, NB Enschede, The Netherlands
6. Department of Electrical Engineering (ESAT), WaveCoRE Division, KU Leuven, Leuven, Belgium
7. National Mobile Communications Research Laboratory, School of Information Science and Engineering, Southeast University, Nanjing, China