基于区块链技术的安全频谱感知算法

在认知无线电网络中,为提升安全性能和感知效率,提出了一种基于区块链技术的安 全频谱感知算法。该算法先对感知节点的可靠度进行评估,通过评估算法得到节点的初始信 赖值,并以初始信赖值为基数,融合中心会依据环境的变化对节点的信赖值定期更新。更新 后的信赖值存储在区块链的管理中心,区块链的管理中心对节点信息加密,一个节点与其自 身信赖值构成一一映射。认知无线电网络执行频谱感知时,融合中心选择信赖值高的有限个 节点参与协作感知,这可在提升感知准确度的同时降低能量开销,并增强认知无线电网络的 鲁棒性。仿真实验结果表明本文中的感知算法性能远优于传统算法,在相同实验条件下,感 知准确度提升5%,能耗降低了12%,极大增强了认知网络的鲁棒性和 频谱感知的安全性。

A secure spectrum sensing algorithm based on blockchain technology

In cognitive radio networks,in order to improve the security performa nce and sensing efficiency,a secure spectrum sensing algorithm based on blockch ain technology is proposed.The algorithm first evaluates the reliability of the sensing node,and obtains the initial trust value of the node through the evalu ation algorithm.Based on the initial trust value,the fusion center will update the trust value of the node regularly according to the change of the environmen t.The updated trust value is stored in the management center of the blockchain. The management center of the blockchain encrypts the node information,and a no de and its own trust value form a one-to-one mapping.When cognitive radio net wo rks perform spectrum sensing,the fusion center selects a limited number of node s with high trust value to participate in cooperative sensing,which can improve the accuracy of sensing,reduce the energy cost and enhance the robustness of c ognitive radio networks.Simulation results show that the performance of the pro posed algorithm is much better than that of the traditional algorithm.Under the same experimental conditions,the sensing accuracy is improved by 5%,and the e nergy consumption is reduced by 12%,which greatly enhances the robustness of co gnitive network and the security of spectrum sensing.