Jiangsu Key Laboratory of Wireless Communications;
Nanjing University of Posts and Tele-Communications;
Nanjing;
210003;
China;
Key Laboratory of Broadband Wireless Communication and Sensor Network Technology;
Ministry of Education;
Nanjing University of Posts and Telecommunications;
Nanjing;
210003;
China;
School of Information Science and Engineering;
Southeast University;
Nanjing;
210018;
China;
Department of Electrical and Computer Engineering;
Faculty of Engineering and Applied Science;
Memorial University of Newfoundland;
St.John’s;
A1B 3X5;
Canada;
Department of Mechanical and Industrial Engineering;
Ryerson University;
Toronto M5B 2K3;
Canada;
Secure communication; average secrecy rate; relay selection; probability density function;