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
Based on the pioneering work of Konishi et al. [Phys. Rev. E （1999） 60 4000], a new feedback control scheme is presented to suppress traffic jams based on the coupled map car-following model under the open boundary ...Based on the pioneering work of Konishi et al. [Phys. Rev. E （1999） 60 4000], a new feedback control scheme is presented to suppress traffic jams based on the coupled map car-following model under the open boundary condition. The effect of the safe headway on the traffic system is considered. According to the control theory, the condition under which traffic jams can be suppressed is analyzed. The results are compared with the previous results concerning congestion control. The simulations show that the suppression performance of our scheme on traffic jams is better than those of the previous schemes, although all the schemes can suppress traffic jams. The simulation results are consistent with theoretical analyses.展开更多
In order to solve the problem that the traditional space jamming countermeasure cannot deal with the mainlobe self-protecting jammings,a polarization-space joint mainlobe jamming countermeasure technique based on divi...In order to solve the problem that the traditional space jamming countermeasure cannot deal with the mainlobe self-protecting jammings,a polarization-space joint mainlobe jamming countermeasure technique based on divided dimensions is proposed.Specifically,the digital beam of each row and column is firstly formed by using dual polarization digital receiving in multi-channel.Then,the polarization-space joint cancellation in both azimuth and elevation dimensions is carried out based on the polarization-space joint difference between the target echo and the jamming,as well as the divided dimension feature of the row and column beams.Finally,the sum and difference beams of the full array in the elevation or azimuth dimension are formed by the beams after jamming cancelling,and the monopulse angle measurement is further employed to obtain target angles.The effectiveness of the proposed technique is verified by simulations,indicating that the self-protecting jamming and multiple mainlobe following jammings can be both cancelled simultaneously with the angle measurement unchanged.展开更多
常规慢速频移键控跳频（frequency-hopping/frequency-shift-keying,FH/FSK）受跟踪干扰威胁严重;差分跳频抗跟踪干扰能力强,但部分频带干扰下误码率高。为提高常规慢速跳频抗跟踪干扰性能,同时不损失抗部分频带干扰性能,提出的多序列...常规慢速频移键控跳频（frequency-hopping/frequency-shift-keying,FH/FSK）受跟踪干扰威胁严重;差分跳频抗跟踪干扰能力强,但部分频带干扰下误码率高。为提高常规慢速跳频抗跟踪干扰性能,同时不损失抗部分频带干扰性能,提出的多序列跳频（multi-sequence frequency hopping,MSFH）无线通信方式中,数据信道和补偿信道频率分别按不同跳频序列跳变,使干扰方无法准确跟踪补偿信道,减少了跟踪干扰影响;而接收机射频前端采用窄带接收,与差分跳频的宽带接收相比可有效抑制部分频带干扰。在瑞利衰落信道下,分析了卷积编码MSFH抗干扰性能。数值和仿真表明,在最坏跟踪干扰下MSFH比常规跳频约有5~10dB误码率性能增益,且抗部分频带干扰性能优于差分跳频。展开更多
在瑞利衰落信道下,分析了跳频通信中噪声跟踪干扰的检测性能.应用认知无线电中协作频谱感知的思想,研究了AWGN(Additive White Gaussian Noise)信道下单跳信号存在干扰的检测性能,在此基础上,推导得到了瑞利衰落信道下的检测概率和虚警...在瑞利衰落信道下,分析了跳频通信中噪声跟踪干扰的检测性能.应用认知无线电中协作频谱感知的思想,研究了AWGN(Additive White Gaussian Noise)信道下单跳信号存在干扰的检测性能,在此基础上,推导得到了瑞利衰落信道下的检测概率和虚警概率,应用硬判决中的"k out of n"准则,得到了瑞利衰落信道下噪声跟踪干扰的检测概率.仿真结果验证了理论分析的正确性.展开更多
基于认知无线电中协作频谱感知的思想,提出了一种跳频通信中噪声跟踪干扰的检测算法。首先采用能量检测算法,研究了干扰条件下单跳信号的检测性能。在此基础上,应用"k out of n"准则,在决策融合模块实现对噪声跟踪干扰的检测...基于认知无线电中协作频谱感知的思想,提出了一种跳频通信中噪声跟踪干扰的检测算法。首先采用能量检测算法,研究了干扰条件下单跳信号的检测性能。在此基础上,应用"k out of n"准则,在决策融合模块实现对噪声跟踪干扰的检测,推导了AWGN信道下噪声跟踪干扰的检测性能。理论分析和仿真结果表明,随着信干噪比的逐渐减小,对于单跳信号和噪声跟踪干扰的检测概率均逐渐增大;而在相同信干噪比情况下,噪声跟踪干扰的检测概率较单跳信号的检测概率得到了提高。展开更多
针对慢跳频通信中噪声跟踪干扰的检测问题,提出了一种新的噪声跟踪干扰检测算法.该检测算法应用认知无线电中协作频谱感知方法,分析了接收信号的条件概率密度函数,研究了加性高斯白噪声信道下单跳信号存在干扰的检测性能.在此基础上,推...针对慢跳频通信中噪声跟踪干扰的检测问题,提出了一种新的噪声跟踪干扰检测算法.该检测算法应用认知无线电中协作频谱感知方法,分析了接收信号的条件概率密度函数,研究了加性高斯白噪声信道下单跳信号存在干扰的检测性能.在此基础上,推导了Nakagami衰落信道下单跳信号存在干扰的检测概率和虚警概率,通过对检测概率和虚警概率中的多重积分进行化简,得到了检测概率和虚警概率的级数表达式.单跳信号检测后,把检测结果上报到融合中心,应用协作频谱感知中的"k out of n"准则分析了噪声跟踪干扰的检测性能.仿真结果验证了理论分析的正确性.展开更多
提出了一种基于修正的旋转信号子空间(rotational signal subspace,RSS)算法的跳频信号和跟踪干扰信号波达方向(direction of arrival,DOA)估计方法。首先,将接收到的跳频信号和跟踪干扰信号进行离散傅里叶变换;然后,利用修正RSS算法,...提出了一种基于修正的旋转信号子空间(rotational signal subspace,RSS)算法的跳频信号和跟踪干扰信号波达方向(direction of arrival,DOA)估计方法。首先,将接收到的跳频信号和跟踪干扰信号进行离散傅里叶变换;然后,利用修正RSS算法,得到聚焦后协方差矩阵的估计值;最后,利用MUSIC算法,实现跳频信号和相关干扰信号的DOA估计。仿真结果验证了该方法的有效性。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).
基金supported by the Major Consulting Project of Chinese Academy of Engineering (Grant No. 2012-ZX-22)the Natural Science Foundation of Chongqing Science & Technology Commission of China (Grant No. 2012jjB40002)+2 种基金the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20120191110047)the Engineering Center Research Program of Chongqing Science & Technology Commission of China (Grant No. 2011pt-gc30005)the Key Technology R&D Project of Chongqing Science & Technology Commission of China (Grant Nos. 2011AB2052 and 2012gg-yyjsB30001)
文摘Based on the pioneering work of Konishi et al. [Phys. Rev. E （1999） 60 4000], a new feedback control scheme is presented to suppress traffic jams based on the coupled map car-following model under the open boundary condition. The effect of the safe headway on the traffic system is considered. According to the control theory, the condition under which traffic jams can be suppressed is analyzed. The results are compared with the previous results concerning congestion control. The simulations show that the suppression performance of our scheme on traffic jams is better than those of the previous schemes, although all the schemes can suppress traffic jams. The simulation results are consistent with theoretical analyses.
文摘In order to solve the problem that the traditional space jamming countermeasure cannot deal with the mainlobe self-protecting jammings,a polarization-space joint mainlobe jamming countermeasure technique based on divided dimensions is proposed.Specifically,the digital beam of each row and column is firstly formed by using dual polarization digital receiving in multi-channel.Then,the polarization-space joint cancellation in both azimuth and elevation dimensions is carried out based on the polarization-space joint difference between the target echo and the jamming,as well as the divided dimension feature of the row and column beams.Finally,the sum and difference beams of the full array in the elevation or azimuth dimension are formed by the beams after jamming cancelling,and the monopulse angle measurement is further employed to obtain target angles.The effectiveness of the proposed technique is verified by simulations,indicating that the self-protecting jamming and multiple mainlobe following jammings can be both cancelled simultaneously with the angle measurement unchanged.
文摘常规慢速频移键控跳频（frequency-hopping/frequency-shift-keying,FH/FSK）受跟踪干扰威胁严重;差分跳频抗跟踪干扰能力强,但部分频带干扰下误码率高。为提高常规慢速跳频抗跟踪干扰性能,同时不损失抗部分频带干扰性能,提出的多序列跳频（multi-sequence frequency hopping,MSFH）无线通信方式中,数据信道和补偿信道频率分别按不同跳频序列跳变,使干扰方无法准确跟踪补偿信道,减少了跟踪干扰影响;而接收机射频前端采用窄带接收,与差分跳频的宽带接收相比可有效抑制部分频带干扰。在瑞利衰落信道下,分析了卷积编码MSFH抗干扰性能。数值和仿真表明,在最坏跟踪干扰下MSFH比常规跳频约有5~10dB误码率性能增益,且抗部分频带干扰性能优于差分跳频。
文摘在瑞利衰落信道下,分析了跳频通信中噪声跟踪干扰的检测性能.应用认知无线电中协作频谱感知的思想,研究了AWGN(Additive White Gaussian Noise)信道下单跳信号存在干扰的检测性能,在此基础上,推导得到了瑞利衰落信道下的检测概率和虚警概率,应用硬判决中的"k out of n"准则,得到了瑞利衰落信道下噪声跟踪干扰的检测概率.仿真结果验证了理论分析的正确性.
文摘基于认知无线电中协作频谱感知的思想,提出了一种跳频通信中噪声跟踪干扰的检测算法。首先采用能量检测算法,研究了干扰条件下单跳信号的检测性能。在此基础上,应用"k out of n"准则,在决策融合模块实现对噪声跟踪干扰的检测,推导了AWGN信道下噪声跟踪干扰的检测性能。理论分析和仿真结果表明,随着信干噪比的逐渐减小,对于单跳信号和噪声跟踪干扰的检测概率均逐渐增大;而在相同信干噪比情况下,噪声跟踪干扰的检测概率较单跳信号的检测概率得到了提高。
文摘针对慢跳频通信中噪声跟踪干扰的检测问题,提出了一种新的噪声跟踪干扰检测算法.该检测算法应用认知无线电中协作频谱感知方法,分析了接收信号的条件概率密度函数,研究了加性高斯白噪声信道下单跳信号存在干扰的检测性能.在此基础上,推导了Nakagami衰落信道下单跳信号存在干扰的检测概率和虚警概率,通过对检测概率和虚警概率中的多重积分进行化简,得到了检测概率和虚警概率的级数表达式.单跳信号检测后,把检测结果上报到融合中心,应用协作频谱感知中的"k out of n"准则分析了噪声跟踪干扰的检测性能.仿真结果验证了理论分析的正确性.
文摘提出了一种基于修正的旋转信号子空间(rotational signal subspace,RSS)算法的跳频信号和跟踪干扰信号波达方向(direction of arrival,DOA)估计方法。首先,将接收到的跳频信号和跟踪干扰信号进行离散傅里叶变换;然后,利用修正RSS算法,得到聚焦后协方差矩阵的估计值;最后,利用MUSIC算法,实现跳频信号和相关干扰信号的DOA估计。仿真结果验证了该方法的有效性。
