CAJ | 학술논문

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。
침대WSNs절점간통신역수비법절점절은적문제，제출료로봉파속성형조성발송책략래제고절점간적가체안전속솔。가설협작간우절점지지도기도절은절점적부분신도상태신식，재최차신도조건하통과우화협작간우절점적조성수입협방차구진래최대화계통적가체안전속솔。위구해차비철적최대최소화문제，수선통과수학등개전화장해비철문제전화위반정규화문제，연후설계료일유수색산법래계산절점간적최우가체안전속솔。최후，통과방진험증료소제산법적유효성。
Aiming at the problem that wireless communication between nodes is vulnerable to eavesdrop-ping in WSNs ,robust beamforming has been designed to realize noise transmitting strategy in the coopera-tive jamming node ,which can improve the achievable secrecy rate .Under the worst channel case ,the a-chievable secrecy rate is maximized by optimizing the noise input covariance matrix of the cooperative jam-ming 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 pro-posed a one-dimensional algorithm to calculate the optimal achievable secrecy rate .Simulation results veri-fy the effectiveness of the proposed approach .