supported in part by National Natural Science Foundation of China under Grant 62071202;in part by Shandong Provincial Natural Science Foundation under Grants ZR2020MF009,ZR2020MF075;in part by Shandong Key Laboratory of Intelligent Buildings Technology undert Grant SDIBT202004.
Intelligent reflecting surface(IRS)has been widely regarded as a promising technology for configuring wireless propagation environments.In this paper,we utilize IRS to assist transmission of a secondary user(SU)in a c...