The College of Communication Engineering;
Army Engineering University of PLA;
Nanjing 210007;
China;
The Unit 31106 of PLA;
Nanjing 210007;
China;
The Department of Computer Science and Technology;
Nanjing University;
Nanjing 210093;
China;
The College of Electronic and Information Engineering;
Nanjing University of Aeronautics and Astronautics;
Nanjing 210016;
China;
Beijing University of Posts and Telecommunications;
Beijing 100876;
China;