一种基于合作干扰的主窃信道安全传输方法

A secure transmission method based on cooperative jamming for correlated main and wiretap channels

提出一种基于合作干扰的安全传输方法,用以减少主窃信道之间相关性带来的保密损失,提高通信系统的保密性能。考虑现有的合作干扰方法集中于主窃信道相互独立的情形,因此,当主窃信道相关时,现有的合作干扰方法由于设计的局限性无法获得足够理想的保密性能。鉴于此,提出一种面向相关主窃信道具有针对性的合作干扰方法。基于相关主窃信道的合作干扰模型,对保密中断概率约束下的保密速率最大化问题进行了形式化。通过采用范数边界法和伯恩不等式法将优化问题的概率约束条件转化成近似的确定形式,能够获得波束成形和人工噪声的一组近似解。仿真结果显示,提出的合作干扰方法能够在高相关性的条件下减少通信系统的保密损失。

A secure transmission method was proposed based on cooperative jamming to reduce the secrecy loss caused by the correlation between main and wiretap channels and to improve the secrecy.Considering that the existing methods of cooperative jamming focused on the case of independent main and wiretap channels,the achievable secrecy performance was not satisfactory.In view of this,a cooperative jamming method for correlated main and wiretap channels was proposed.Based on the model of cooperative jamming under correlated main and wiretap channels,the secrecy rate maximization under secrecy outage constraint was formulated.Then,the norm bounding approach and the Bernstein-type inequality approach were employed to approximately transform the probabilistic constraint into a deterministic form,and a safe approximate solution of beamforming vector and AN covariance matrix was obtained.Simulation results show that the proposed method can reduce the secrecy loss under high correlation.