WSN中一种用于频谱检测的节点选择与路由算法

A NODE SELECTION AND ROUTING ALGORITHM FOR SPECTRUM DETECTION IN WIRELESS SENSOR NETWORKS

针对无线传感器网络中的频谱检测问题,首先采用基于能量的检测器获取各个传感器节点的信息数据,然后提出一种用于频谱检测的节点选择和路由算法。该算法在给定的能量约束下迭代选择最优的传感器节点集合形成一颗能量有效的路由树。在路由树中。各个母结点通过对数似然比对各子结点的信息进行融合后发往查询结点,由查询节点来决定主要用户是否占用了频带。从而在给定的虚警率和传感器网络发送信息所需能耗的情况下,最大化查询结点的总检测率。仿真实验结果表明算法是有效的,在检测率及网络生命周期等方面都要优于传统的方法。

Aiming at spectrum detection issue in wireless sensor networks, we first use energy-based detector to collect information data from each sensor node, and then propose a node selection and routing algorithm for spectrum detection. The algorithm iteratively selects and aggregates optimal sensor nodes under given energy constraint to form an energy-effective routing tree, in it each parent node fuses the infor- mation of every child node of it by using log-likelihood ratios and then forwards to query node, it is by the query node to determine whether the main user occupies the band or not. Therefore, the overall probability of detection （PD） is maximised at querying node for a given probability of false alarm （PFA） and a given power budget needed for sensor network to send the information. Simulation experimental results show that the proposed algorithm is effective, and is superior to the traditional methods in terms of the detection probability and lifetime of network.