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| Robust Secure Transmit Method with Imperfect Channel State Information |
| Zhang Li-jian Jin Liang Liu Lu Luo Wen-yu |
| (National Digital Switching System Engineering & Technological Research Center, Zhengzhou 450002, China) |
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Abstract The security performance of the communication system degrades dramatically when the covariance- based Channel State Information (CSI) is imperfect at the transmitter. To overcome this problem, a robust Artificial Noise (AN) aided transmit method is proposed. The objective is to jointly design the transmit beamforming vector and the AN covariance with the imperfect covariance-based CSI at the transmitter, such that the Worst-Case Secrecy Rate (WCSR) of the system is maximized. The secrecy rate maximization problem is non-convex. Due to the intractability, this problem is recast into a series of SemiDefinite Programs (SDPs) using the SemiDefinite Relaxation (SDR) technique and the Lagrange duality. Simulation results demonstrate that the proposed method provides substantial performance improvements over the existing method.
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Received: 25 July 2014
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Corresponding Authors:
Jin Liang
E-mail: liangjin@263.net
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2015, Vol. 37 
