This paper deals with the follower jamming(FJ)resistance for the frequency hopping(FH)communication system over additive white Gaussian noise(AWGN)channel.Conventional FH systems are susceptible to be jammed by FJ,and...This paper deals with the follower jamming(FJ)resistance for the frequency hopping(FH)communication system over additive white Gaussian noise(AWGN)channel.Conventional FH systems are susceptible to be jammed by FJ,and multi-pattern frequency hopping(MPFH)has good resistance to FJ.To further improve the FJ rejection capability of MPFH,we propose a wide gap multi-pattern frequency hopping(WGMPFH)scheme.WGMPFH uses channels to represent messages,and the data channel and complementary channel are hopping on orthogonal frequency slots according to wide gap FH patterns.The transmitted signal lures FJ to aim at the data channel and the complementary channel is away from FJ by adopting wide gap frequency patterns.FJ does not affect the complementary channel but increases the signal energy in the data channel,thus the effect of FJ is reduced.Its bit error rate(BER)is derived under FJ and the effects of three FJ parameters(tracking success probability,jamming duration ratio and jamming bandwidth ratio)on the BER performance of WGMPFH are investigated versus the co nventional FH/BFSK and MPFH system.Numerical and simulation results show that when under the worst-case FJ,the proposed WGMPFH outperforms the MPFH by about 1-3 dB and outperforms the conventional FH/BFSK by more than 4 dB.The proposed WGMPFH shows superior jamming rejection performance under FJ especially in severe signal-to-jamming ratio(SJR).展开更多
针对车载无线通信的广播特性以及车辆的高移动性使得系统的安全性难以保障的问题,提出一种非理想信道状态信息(Channel State Information,CSI)下基于人工噪声(Artificial Noise,AN)和协作干扰辅助的车载通信物理层安全传输机制。利用...针对车载无线通信的广播特性以及车辆的高移动性使得系统的安全性难以保障的问题,提出一种非理想信道状态信息(Channel State Information,CSI)下基于人工噪声(Artificial Noise,AN)和协作干扰辅助的车载通信物理层安全传输机制。利用一阶高斯马尔可夫过程刻画由于车辆高速移动引起的非理想CSI,通过AN辅助的波束成形以及协作车辆发送干扰噪声的联合,保障合法车载用户数据传输的物理层安全。考虑非理想CSI对合法链路传输和AN泄露的影响,利用随机几何理论推导合法链路安全吞吐量的封闭表达式并进行系统性能分析。通过仿真验证所提机制的有效性。展开更多
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
基金The National Natural Science Foundation of China(No.61531009,No.61471108)The National Major Projects of China(No.2016ZX03001009)。
文摘This paper deals with the follower jamming(FJ)resistance for the frequency hopping(FH)communication system over additive white Gaussian noise(AWGN)channel.Conventional FH systems are susceptible to be jammed by FJ,and multi-pattern frequency hopping(MPFH)has good resistance to FJ.To further improve the FJ rejection capability of MPFH,we propose a wide gap multi-pattern frequency hopping(WGMPFH)scheme.WGMPFH uses channels to represent messages,and the data channel and complementary channel are hopping on orthogonal frequency slots according to wide gap FH patterns.The transmitted signal lures FJ to aim at the data channel and the complementary channel is away from FJ by adopting wide gap frequency patterns.FJ does not affect the complementary channel but increases the signal energy in the data channel,thus the effect of FJ is reduced.Its bit error rate(BER)is derived under FJ and the effects of three FJ parameters(tracking success probability,jamming duration ratio and jamming bandwidth ratio)on the BER performance of WGMPFH are investigated versus the co nventional FH/BFSK and MPFH system.Numerical and simulation results show that when under the worst-case FJ,the proposed WGMPFH outperforms the MPFH by about 1-3 dB and outperforms the conventional FH/BFSK by more than 4 dB.The proposed WGMPFH shows superior jamming rejection performance under FJ especially in severe signal-to-jamming ratio(SJR).
文摘针对车载无线通信的广播特性以及车辆的高移动性使得系统的安全性难以保障的问题,提出一种非理想信道状态信息(Channel State Information,CSI)下基于人工噪声(Artificial Noise,AN)和协作干扰辅助的车载通信物理层安全传输机制。利用一阶高斯马尔可夫过程刻画由于车辆高速移动引起的非理想CSI,通过AN辅助的波束成形以及协作车辆发送干扰噪声的联合,保障合法车载用户数据传输的物理层安全。考虑非理想CSI对合法链路传输和AN泄露的影响,利用随机几何理论推导合法链路安全吞吐量的封闭表达式并进行系统性能分析。通过仿真验证所提机制的有效性。
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。
