期刊
IEEE WIRELESS COMMUNICATIONS LETTERS
卷 8, 期 5, 页码 1410-1414出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2019.2919685
关键词
Intelligent reflecting surface; phase shift optimization; passive beamforming; physical-layer security
资金
- National Natural Science Foundation of China [61571138]
- Science and Technology Plan Project of Guangdong Province [2017B090909006, 2018A050506015, 2019B010119001]
- Science and Technology Plan Project of Guangzhou City [201803030028, 201904010371]
An intelligent reflecting surface (IRS) can adaptively adjust the phase shifts of its reflecting units to strengthen the desired signal and/or suppress the undesired signal. In this letter, we investigate an IRS-aided secure wireless communication system where a multi-antenna access point (AP) sends confidential messages to a single-antenna user in the presence of a single-antenna eavesdropper. In particular, we consider the challenging scenario where the eavesdropping channel is stronger than the legitimate communication channel and they are also highly correlated in space. We maximize the secrecy rate of the legitimate communication link by jointly designing the AP's transmit beamforming and the IRS's reflect beamforming. While the resultant optimization problem is difficult to solve, we propose an efficient algorithm to obtain high-quality suboptimal solution for it by applying the alternating optimization, and semidefinite relaxation methods. Simulation results show that the proposed design significantly improves the secrecy communication rate for the considered setup over the case without using the IRS, and outperforms a heuristic scheme.
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