基于时变白化滤波器的DSSS系统干扰盲检测

Blind jamming detection based on time variant whitener for DSSS systems

将循环维纳滤波应用于直接序列扩频(direct sequence spread spectrum,DSSS)系统的干扰检测,并提出了一种干扰盲检测器,称之为时变白化滤波检测器。由于DSSS信号和干扰信号具有不同的循环平稳特征,因此可以调整时变白化滤波检测器的滤波器系数,使干扰检测器的输出只包含背景噪声和干扰信号,从而实现干扰盲检测。仿真结果表明,采用本文提出的循环平稳干扰检测器的DSSS接收系统能够在较大的干信比范围内检测干扰信号的存在,并且在性能上优于时不变白化滤波检测器。

This paper applies cyclic wiener filter to jamming detection for direct sequence spread spectrum(DSSS)systems and proposes a blind jamming detector,named time variant whitener based detector.Due to the distinct cyclostationarity features of the DSSS signal and jamming signal,the filtering coefficients of time varying whitener(TVW)detector can be adjusted to make the output of the detector contain jamming signal and background noise,so as to realize blind jamming detecting.The simulation results show that the DSSS receiving structures using the proposed cyclostationary-based jamming detection can decide the presence of jamming signal at a wide range of jamming-to-signal ratio,and outperforms the time invariant whitener-based detector.