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- Title
非理想信道状态信息下 RIS 辅助的安全通信.
- Authors
李 萌; 孙艺夫; 安 康; 牛和昊; 朱勇刚; 李 程; 关东方
- Abstract
The secure transmission capability of multiuser wireless networks can be improved by employing a reconfigurable intelligent surface (RIS) assisted wireless transmitter. To enhance the performance against both the jamming and eavesdropping attacks, a robust beamforming optimization problem is formulated based on the imperfect channel state information (CSI). Specifically, with a RIS-assisted transmitter, the phase beamforming of the RIS and the transmit power of the base station are jointly optimized to minimize the total transmit power of the system, while meeting the worst-case rate constraints with the bounded CSI and the rate outage probability constraints with the statistical CSI respectively. Owing to the intractability induced by the CSI uncertainty, the S-procedure is used to relax the worst-case ( secrecy) rate constraints and the large-deviation inequality ( LDI ) to relax the ( secrecy ) rate outage probability constraints. Numerical simulations demonstrate the proposed schemes can reduce up to about 88% and 93% total transmit power and improve about 15 dBm and 12 dBm jamming margin compared with the passive reflector method and the conventional beamforming scheme respectively.
- Subjects
ROBUST optimization; BEAMFORMING; RADAR interference; EAVESDROPPING; TRANSMITTERS (Communication); COMPUTER simulation; RESOURCE allocation
- Publication
Telecommunication Engineering, 2023, Vol 63, Issue 7, p1017
- ISSN
1001-893X
- Publication type
Article
- DOI
10.20079/j.issn.1001-893x.220224002