基于鲁棒波束成形的WSNs可达安全速率研究

On Achievable Secrecy Rate in WSNs Based on Robust Beamforming

针对WSNs节点间通信易受非法节点窃听的问题,提出了鲁棒波束成形噪声发送策略来提高节点间的可达安全速率.假设协作干扰节点只知道其到窃听节点的部分信道状态信息,在最差信道条件下通过优化协作干扰节点的噪声输入协方差矩阵来最大化系统的可达安全速率.为求解此非凸的最大最小化问题,首先通过数学等价转化将该非凸问题转化为半定规划问题,然后设计了一维搜索算法来计算节点间的最优可达安全速率.最后,通过仿真验证了所提算法的有效性.

Aiming at the problem that wireless communication between nodes is vulnerable to eavesdropping in WSNs,robust beamforming has been designed to realize noise transmitting strategy in the cooperative jamming node,which can improve the achievable secrecy rate.Under the worst channel case,the achievable secrecy rate is maximized by optimizing the noise input covariance matrix of the cooperative jamming node.To tackle this challenging non-convex max-min optimization issue,we have first transferred this non-convex optimization problem into an equivalent semi-definite programming problem,and then proposed a one-dimensional algorithm to calculate the optimal achievable secrecy rate.Simulation results verify the effectiveness of the proposed approach.