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中文摘要：
现有人工噪声方法发送保密信号时在合法信道零空间内加入人工噪声以降低被截获概率,但当窃听者天线数不少于发送者时,该方法失效,针对这一问题,文中提出一种物理层安全的信号子空间人工噪声跳空方法.发送者随机选择信号子空间传输保密信号,并叠加人工噪声,合法接收者根据跳空图样选择相应信号子空间接收保密信号,并利用收发双方约定的噪声信息去除其中叠加的人工噪声,解调出保密信息,窃听者未知跳空图样和噪声信息,无法找到信号子空间和去除保密信号中的人工噪声,不能解调出保密信息.仿真结果表明,合法接收者SNR损失小于3dB,在QPSK调制方式下窃听者误符号率接近0.75.
英文摘要：
Existing artificial noise method adds artificial noise into the null space of legal channel to reduce the probability of being intercepted when sending confidential signal,if the antenna of eavesdropper is not less than the transmitter,it is disable.To solve this problem,the signal subspace artificial noise space-hopping method of physical-layer-security is proposed.Transmitter randomly selected the signal subspace to transmit confidential signal,and added artificial noise to the signal subspace.The legitimate receiver selects the corresponding signal subspace according to the Space-hopping pattern,and removes the artificial noise superimposed in the confidential signal using the agreed artificial noise,then modulates the confidential information.The eavesdropper unknown Space-hopping pattern and the agreed artificial noise,cannot find the signal subspace and remove the artificial noise superimposed in the confidential signal,so cannot eavesdrop confidential information.Simulations show that legitimate receiver＇ s SNR loss less than 3dB,and the symbol error rate of eavesdropper close to 0.75 with QPSK modulation.
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