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| Physical Layer Security Scheme Resistant to Multi-eavesdroppers with Inaccurate Channel State Information in Relay Network |
| Lei Wei-jia Zuo Li-jie Jiang Xue Xie Xian-zhong |
| Chongqing Key Laboratory of Mobile Communications Technology, Chongqing University of Posts and Telecommunications, Chongqing 400065, China |
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Abstract This paper investigates the relay transmission system in the presence of multiple collusion single-antenna eavesdroppers. A physical layer security scheme employing nullspace Artificial Noise (AN) and Amplify-and-Forward (AF) relay beamforming is designed. In the case that channel state information can not be accurately obtained, the weighted matrice of relay beamforming and the nullspace AN covariance are jointed optimized based on the Semi-Definite Programs (SDP), which can effectively reduce the amount of the information likely to be obtained by the multiple collusion eavesdroppers and significantly improve the security capacity of the system. It is an effective physical security transmission scheme with good robustness. Simulation results verify that the scheme has good performance.
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Received: 10 December 2014
Published: 18 June 2015
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Corresponding Authors:
Zuo Li-jie
E-mail: zuolijie1111@163.com
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