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多径信道下解调加权分数傅里叶变换加密的混沌直扩信号

袁国刚 陈自力 高喜俊

袁国刚, 陈自力, 高喜俊. 多径信道下解调加权分数傅里叶变换加密的混沌直扩信号[J]. 电子与信息学报, 2023, 45(5): 1714-1721. doi: 10.11999/JEIT220426
引用本文: 袁国刚, 陈自力, 高喜俊. 多径信道下解调加权分数傅里叶变换加密的混沌直扩信号[J]. 电子与信息学报, 2023, 45(5): 1714-1721. doi: 10.11999/JEIT220426
YUAN Guogang, CHEN Zili, GAO Xijun. Demodulation of Weighted Fractional Fourier Transform Encrypted Chaotic Direct Spread Signals over Multipath Fading Channels[J]. Journal of Electronics & Information Technology, 2023, 45(5): 1714-1721. doi: 10.11999/JEIT220426
Citation: YUAN Guogang, CHEN Zili, GAO Xijun. Demodulation of Weighted Fractional Fourier Transform Encrypted Chaotic Direct Spread Signals over Multipath Fading Channels[J]. Journal of Electronics & Information Technology, 2023, 45(5): 1714-1721. doi: 10.11999/JEIT220426

多径信道下解调加权分数傅里叶变换加密的混沌直扩信号

doi: 10.11999/JEIT220426
详细信息
    作者简介:

    袁国刚:男,博士生,研究方向为混沌安全通信

    陈自力:男,教授,博士生导师,研究方向为无人机测控抗截获、抗干扰、抗欺骗技术

    高喜俊:男,讲师,研究方向为通信信号处理

    通讯作者:

    陈自力 chenzl_mec@163.com

  • 中图分类号: TN911

Demodulation of Weighted Fractional Fourier Transform Encrypted Chaotic Direct Spread Signals over Multipath Fading Channels

  • 摘要: 为了在多径信道下解调加权分数傅里叶变换加密的混沌直扩(WFRFT-CD3S)信号,该文提出一种广义信道差分解调算法。在WFRFT-CD3S系统的发射端先对信息码进行差分调制,接收端将差分码与信道的乘积视为广义信道,并通过本地扩频序列构建频域匹配滤波器以估计广义信道冲击响应。接收端通过解差分广义信道冲击响应的估计值来合并各径能量并恢复信息码。对所提算法的误码率进行了理论分析,数值仿真验证了理论分析结果。数值仿真结果表明提出的解调算法可以在低信噪比下解调多径WFRFT-CD3S信号,保证了WFRFT-CD3S系统抗能量检测的能力。
  • 图  1  WFRFT-CD3S系统模型

    图  2  接收信号片段分割示意图

    图  3  广义信道冲击响应估计值对比

    图  4  不同总路径数下误码率随信噪比变化的曲线

    图  5  误码率为${10^{ - 5}}$时信噪比与总路径数的关系

    图  6  3种解调算法的误码性能比较

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出版历程
  • 收稿日期:  2022-04-11
  • 修回日期:  2022-08-30
  • 网络出版日期:  2022-09-05
  • 刊出日期:  2023-05-10

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