摘要
当无线传感器网络中存在多个非法窃听节点时,合法节点间通信的安全性就面临着严重威胁;针对此问题,在发送节点不知道其到各窃听节点准确信道状态信息的情况下,优化出可使节点间可达保密速率最大化的最优输入协方差矩阵;此优化问题是一个很难直接求解的非凸优化问题,文中通过一些等价变换将此非凸优化问题转变成一个仅由凸约束集构成的可行性问题,并利用二分法设计了计算最大可达保密速率的迭代算法;最后针对窃听节点的数目以及信道误差的大小对可达保密速率的影响进行了仿真,仿真结果验证了算法的有效性和理论分析的正确性。
when some illegal wiretap nodes existed in wireless sensor networks, the security of communication between legitimate nodes are facing with a serious threat. To solve this problem, the optimal input covariance matrix is obtained by maximize the achievable secrecy rate with the case that the transmitter does not known the perfect channel state information about wiretap nodes. This optimization problem is a non--convex optimal problem, which is difficulty to handle directly, and an equivalent feasible problem which is composed by some con vex constrain sets is obtained by using some mathematical ways. An iteration algorithm based on bisection method is designed to calculate the maximum achievable rate. Finally, simulation results verify the effectiveness of the proposed approach.
出处
《计算机测量与控制》
北大核心
2014年第2期584-586,共3页
Computer Measurement &Control
基金
四川省教育厅2014年度一般项目(14ZB0315)
关键词
无线传感器网络
可达保密速率
物理层安全
非凸优化
二分法
wireless sensor networks （WSNs）
achievable secrecy rate
physical security
non--convex optimization
bisection method
