基于放大转发和协作拥塞的窄带物联网物理层安全容量研究

NB-IoT Security Capacity Research in the Physical Based on Amplifer Forward and Cooperative Jamming Strategies

基于蜂窝的窄带物联网NB-IoT(Narrow Band Internet of Things)技术发展迅猛,随着节点数目的急剧增加及窄带无线网络的开放性,其安全问题面临严重的挑战。针对NB-IoT的不可信或窃听节点会带来严重安全威胁的问题,利用其上下行信道状态可知和半双工的特性,提出利用中继节点地放大转发、协作拥塞及联合协作保障物理层安全。放大转发节点对源信号进行放大和转发,协作拥塞节点发射干扰信号,调整波束赋形因子和功率使干扰到达目的节点为零而到达窃听者非零。仿真表明,中继节点所带来的分集增益能显著改善接收节点的信号质量,提升5倍安全容量,在不需要加密算法的情况下,确保窃听者无法获取有用信息,保证信息传输的安全。安全容量是指合法接收端可以正确接收,而窃听者即无法获取信息的最大可达通信速率。

Narrow Band Internet of Things（NB-IoT）technology has developed rapidly in recent years,the security problem is facing a serious challenge with the sharp increase of the number of nodes and the openness of NB-IoT.In view of the problem of serious security threats to the non trusted or eavesdropping nodes of the NB-IoT,it is proposed that the physical layer security can be guaranteed by using the amplify and forward and cooperative congestion strategy of the relay nodes.Amplify and forward relay nodes amplify and forward the source signal,and the cooperative congestion node gives the eavesdropping node a greater interference signal than the destination node,which bring the diversity gain together.Simulation results show that the diversity gain brought by the relay nodes can significantly improve signal quality of receiving nodes,enhance channel and security capacity,and ensure that the eavesdropper can＇t obtain the useful information even without high layer encryption algorithm.