Jiangsu Key Laboratory of Wireless Communications;
Nanjing University of Posts and Telecommunications;
Nanjing 210003;
China;
Engineering Research Center of Health Service System Based on Ubiquitous Wireless Networks;
Ministry of Education;
Nanjing University of Posts and Telecommunications;
Nanjing 210003;
China;
School of Information Science and Technology;
Nantong University;
Nantong 226019;
China;
Research Center of Networks and Communications;
Peng Cheng Laboratory;
Shenzhen 518066;
China;
School of Electronics and Communication Engineering;
Sun Yat-sen University;
Guangzhou 510006;
China;
reconfigurable intelligent surface; ergodic secrecy rate; statistical CSI; alternating optimization algorithm;