基于非理想信道狀態(tài)信息的魯棒安全發(fā)送方法
doi: 10.11999/JEIT140994
基金項目:
國家自然科學基金(61171108, 61401510, 61379006)資助課題
Robust Secure Transmit Method with Imperfect Channel State Information
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摘要: 針對協(xié)方差信道狀態(tài)信息(Channel State Information, CSI)不理想導致的通信系統(tǒng)安全性能惡化問題，該文提出一種魯棒的人工噪聲輔助的物理層安全發(fā)送方法。該方法基于非理想的協(xié)方差信道信息，對發(fā)送者的波束成形向量及人工噪聲協(xié)方差進行聯(lián)合優(yōu)化設(shè)計，從而最大化系統(tǒng)的最差情況安全速率(Worst-Case Secrecy Rate, WCSR)。該功率受限的安全速率最大化問題是非凸的，采用半定松弛(SemiDefinite Relaxation, SDR)技術(shù)和Lagrange對偶理論將其轉(zhuǎn)化為一系列的半定規(guī)劃(SemiDefinite Program, SDP)問題進行求解。仿真結(jié)果表明，與現(xiàn)有方案相比，所提方法的安全性能有了明顯的提升。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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