基于分布式检测的OFDM导频干扰改进方案

Distributed detection pilot jamming scheme against OFDM systems

由于信道及接收机噪声的影响,传统的导频干扰方案会存在相位偏差,导致干扰效果下降。为此,提出了一种基于分布式检测的导频干扰改进方案。首先,在干扰范围内分布多个检测终端,实时检测并反馈干扰信号的相位偏差;然后,干扰信号发射机实时调整干扰符号的相位,使之与目标信号导频的相位相反。仿真结果表明,该方案可以较好地减少干扰信号相位偏差对导频干扰性能的影响,提高干扰效果。

Because of the effect of channel and noise,the effect of the traditional pilot jamming scheme would decline because of the phase deviation.In order to avoid the problem,this paper brought forward a new scheme based on distribution detection.Firstly,this paper detected the phase deviation of the jamming signal by the terminal distributed in the jamming area;and then,the result of the detection would be sent to the jamming signal transmitter,and it would drive the jamming signal phase equal to the π-radian offset of the transmitted pilot tone value.Simulations prove that the scheme is effective on decreasing the phase deviation of the jamming signal.