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窃听信道模型中存在发送者,合法接收者和窃听者。在发送端中人为地加入噪声(即人造噪声)能够提高信道的安全速率。但现有人造噪声均是在假定系统定时准确条件下设计的。而在实际的多径信道中,如果合法接收者的接收机有定时偏差,有用信号会被人造噪声干扰,造成安全速率下降。该文通过对多径信道的研究和分析,运用信号处理的方法,提出了一种能够抵抗定时偏差的人造噪声设计。给出了低复杂度的对偶算法进行人造噪声与子载波之间的功率分配。仿真结果表明:所提出的人造噪声设计能够有效地抵抗定时偏差。
Eavesdropping Channel models exist for senders, legitimate recipients, and eavesdroppers. Artificially adding noise (ie, artificial noise) at the transmitting end can improve the channel security rate. However, the existing artificial noise is designed under the assumption that the system timing is accurate. However, in a real multipath channel, if the receiver of a legitimate receiver has a timing offset, the useful signal will be interfered by man-made noise, resulting in a decrease of the security rate. Through the research and analysis of multipath channel and using the method of signal processing, this paper proposes a kind of artificial noise design which can resist the timing deviation. The dual algorithm with low complexity is given to allocate power between artificial noise and subcarrier. The simulation results show that the proposed artificial noise design can effectively resist the timing deviation.