模拟主用户攻击下协作频谱感知最佳融合准则  

Optimal Fusion Rule of Cooperative Spectrum Sensing in Presence of Primary User Emulation Attack

作　　者：李莎[1] 戴建新[2] 程崇虎[1] 汪鹏[1] 王军[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]南京邮电大学理学院,江苏南京210023

出　　处：《计算机技术与发展》2017年第4期126-129,共4页Computer Technology and Development

基　　金：江苏省博士后科研资助计划(1501073B);南京邮电大学自然科学基金(NY214108)

摘　　要：认知无线电网络中,协作频谱感知技术利用多个认知用户的本地感知,克服了多径效应、阴影效应等问题的制约,提高了系统的检测性能。认知无线电提出的动态频谱接入方法在有效解决频谱稀缺问题的同时也给网络带来了威胁。其中之一就是主用户模拟攻击(PUEA),即一些恶意用户试图模仿主用户信号来欺骗次级用户,从而阻止次级用户访问空闲频段。考虑一个能根据自己的感知并判决主用户是否存在的智能攻击者,它在主用户不存在时发送伪造信号;在此基础上推导了基于能量检测的协作频谱感知检测概率,并进一步对融合准则进行了优化,从而得到了总误差概率最小时的最佳融合准则;对PUEA存在情况下基于能量检测的协作频谱感知的最佳融合准则进行了仿真,进一步验证了推导结果。In cognitive radio network, cooperative spectrum sensing technology overcomes the problems of multipath effects, shadow effects and so on by using local sensing results of cognitive users, improving the detection performance. However, cognitive radio, which is a solution for spectrum scarcity by means of a dynamic spectrum access, imposes some threats to the network. One of these common threats is Primary User Emulation Attack （PUEA） ,where some malicious users try to mimic the primary signal and deceive secondary us- ers to prevent them from accessing the vacant frequency bands. A smart attacker is considered who performs its own spectrum sensing and according to its acquired knowledge about the presence or absence of the primary signal, sending fake signals when the primary user signal is not present in the radio environment. The detection probability of cooperative spectrum sensing based on energy detection in the pres- ence of a PUEA is deduced, and the fusion rule is optimized, thus the optimal fusion rule under the minimum total error probability could be got. The optimal fusion rule of cooperative spectrum sensing based on energy detection in the presence of PUEA is simulated, and the results verify the conclusions of theory deducing exactly.

关 键 词：认知无线电 协作频谱感知 主用户模拟攻击 最佳融合准则 

分 类 号：TN929.5[电子电信—通信与信息系统]