重叠加窗下卫星直序扩频通信干扰非线性抑制方法  

Nonlinear suppression method of satellite direct sequence spread spectrum communication interference under overlapping windowing

作　　者：王建鹏 陈晔[1] 曹德胜 WANG Jianpeng;CHEN Ye;CAO Desheng(North University of China,Taiyuan 030051,China;School of Computing,North China Institute of Science and Technology,Langfang 101601,China)

机构地区：[1]中北大学,山西太原030051 [2]华北科技学院计算机学院,河北廊坊101601

出　　处：《现代电子技术》2024年第9期16-20,共5页Modern Electronics Technique

基　　金：国家自然科学基金项目:采动覆岩压拉应变转换区时空连续信息感知与变形破坏机理研究(42377200)。

摘　　要：由于离散傅里叶变换是通过对整个窗口内的信号进行频域变换,如果信号在窗口的两端产生不连续性,会导致频谱泄漏。而重叠加窗技术能够通过窗口的重叠部分来平滑信号,在不同时间窗口之间实现平滑过渡,减小频率泄漏和旁瓣效应的影响。因此,为提高通信性能,文中研究重叠加窗下卫星直序扩频通信干扰非线性抑制方法。将卫星直序扩频通信信号分成两路,通过改进升余弦窗函数,分别进行1/2重叠加窗处理;利用调制离散傅里叶变换算法变换加窗后的两路扩频通信时域信号,得到频域信号;采用自适应门限干扰检测算法非线性干扰抑制两路频域信号;由改进自适应幅度恢复非对称算法还原抑制后的频域信号,并对其进行逆变换处理,得到时域信号;按照1/2重叠加窗思想,融合两路时域信号,完成通信干扰非线性抑制。实验结果证明:该方法可有效重叠加窗处理卫星直序扩频通信时域信号,避免了旁瓣效应的影响,准确地抑制了卫星直序扩频通信干扰。Since the discrete Fourier transform(DFT)involves frequency domain transformation of the signals in the entire window,it may lead to spectrum leakage if discontinuity occurs to the signals at both ends of the window.The overlapping windowing technology can smooth the signals by the overlapping parts of the window,achieve smooth transitions among different time windows,and reduce the impact of frequency leakage and sidelobe effects.Therefore,a nonlinear suppression method for satellite direct sequence spread spectrum communication interference under overlapping windowing is studied in order to improve communication performance.The satellite direct sequence spread spectrum communication signals are divided into two channels,and 1/2 overlapping windowing processing is performed by improving the raised cosine window function.The modulation DFT algorithm is used to transform the windowed 2⁃channel spread spectrum communication time⁃domain signals and obtain the frequency⁃domain signals.Adaptive threshold interference detection algorithm is adopted to interference and suppress 2⁃channel frequency⁃domain signals nonlinearly.The improved adaptive amplitude recovery asymmetric algorithm is used to restore the suppressed frequency⁃domain signals,which is then subjected to inverse transformation processing to obtain the time⁃domain signals.According to the idea of 1/2 overlapping windowing,2⁃channel time⁃domain signals are fused to achieve the nonlinear suppression of communication interference.The experimental results have shown that the proposed method can effectively fulfill overlapping windowing to process time⁃domain signals in satellite direct sequence spread spectrum communication,which avoids the influence of sidelobe effects and accurately suppresses the interference of satellite direct sequence spread spectrum communication.

关 键 词：重叠加窗 卫星直序 扩频通信干扰 非线性抑制 窗函数 傅里叶变换 门限干扰 幅度恢复 

分 类 号：TN914.42-34[电子电信—通信与信息系统]