基于非理想信道状态信息的鲁棒安全发送方法
doi: 10.11999/JEIT140994
Robust Secure Transmit Method with Imperfect Channel State Information
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摘要: 针对协方差信道状态信息(Channel State Information, CSI)不理想导致的通信系统安全性能恶化问题,该文提出一种鲁棒的人工噪声辅助的物理层安全发送方法。该方法基于非理想的协方差信道信息,对发送者的波束成形向量及人工噪声协方差进行联合优化设计,从而最大化系统的最差情况安全速率(Worst-Case Secrecy Rate, WCSR)。该功率受限的安全速率最大化问题是非凸的,采用半定松弛(SemiDefinite Relaxation, SDR)技术和Lagrange对偶理论将其转化为一系列的半定规划(SemiDefinite Program, SDP)问题进行求解。仿真结果表明,与现有方案相比,所提方法的安全性能有了明显的提升。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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