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...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。展开更多
In this paper, a weighted fractional Fourier transform(WFRFT) based cooperative overlay system, aiming to guarantee physical layer(PHY) security, is proposed. The paper elaborates how WFRFT and physical layer properti...In this paper, a weighted fractional Fourier transform(WFRFT) based cooperative overlay system, aiming to guarantee physical layer(PHY) security, is proposed. The paper elaborates how WFRFT and physical layer properties of the wireless medium are collaborated to guarantee the secrecy of wireless transmissions. In the proposed system, WFRFT is first preform on the secret data, such that the transmitted signal is distorted and can only be neutralized by inverse-WFRFT with the same parameter. And then two streams of the transformed sequences that bearing different messages are cooperatively and simultaneously transmitted to two legitimate receivers via a beamforming-liked method, respectively. In general, both the rapid spatial decorrelation property and the inherent security features of WFRFT are leveraged, such that only the eavesdropper's is degraded, and hence, the wireless communication secrecy is reliably guaranteed. Numerical simulations are conducted to evaluate the performance of the proposed system in terms of the average bit error rate and the secrecy capacity.展开更多
文摘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。
基金supported by the National Basic Research Program of China under Grant 2013CB329003the National Natural Science Founda-tion General Program of China under Grant 61171110
文摘In this paper, a weighted fractional Fourier transform(WFRFT) based cooperative overlay system, aiming to guarantee physical layer(PHY) security, is proposed. The paper elaborates how WFRFT and physical layer properties of the wireless medium are collaborated to guarantee the secrecy of wireless transmissions. In the proposed system, WFRFT is first preform on the secret data, such that the transmitted signal is distorted and can only be neutralized by inverse-WFRFT with the same parameter. And then two streams of the transformed sequences that bearing different messages are cooperatively and simultaneously transmitted to two legitimate receivers via a beamforming-liked method, respectively. In general, both the rapid spatial decorrelation property and the inherent security features of WFRFT are leveraged, such that only the eavesdropper's is degraded, and hence, the wireless communication secrecy is reliably guaranteed. Numerical simulations are conducted to evaluate the performance of the proposed system in terms of the average bit error rate and the secrecy capacity.
