基于博弈论的电视频谱感知与传输安全策略

Spectrum Sensing and Transmission Security Strategy of TV Spectrum Based on Game Theory

利用认知无线电(Cognitive Radio,CR)技术,次用户(Secondary Users,SU)在感知电视空白信道时会面临干扰攻击,在传输数据阶段也会受到大量干扰与窃听攻击。针对感知和传输两阶段都存在的恶意攻击,首先利用能量采集(Energy Harvesting,EH)技术建立EH-CR系统模型,并提出时隙下的效用函数。其次,利用势博弈与Stackelberg博弈两层博弈分别研究了SU最优传输信道与最优时隙分配策略,逐渐优化感知检测概率和传输保密容量。再次,为了进一步提高安全性能,在每个时隙最后给出发射功率迭代更新公式,合理利用SU剩余能量。最后,通过仿真验证了所提方法在检测率和保密容量上的优越性。

With Cognitive Radio(CR)technology,Seconday Users(SU)will face interference attacks when perceiving blank channels of the TV,and will also be subjected to a lot of interference and eavesdropping attacks during the data transmission phase.Aiming at the malicious attacks in both sensing and transmission stages,firstly,Energy Harvesting technology was used to build EH-CR system model,and utility function in time slot was proposed.Secondly,the SU optimal transmission channel and optimal slot allocation strategy are studied by using potential game and Stackelberg game to gradually optimize the sensing detection probability and transmission security rate.Thirdly,in order to further improve the safety performance,the iterative transmission power update formula is given at the end of each time slot to rationally utilize the SU residual energy.Finally,the superiority of the proposed method in detection rate and secrecy rate is verified by simulation.