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基于分数阶Fourier变换的Chirp-COTR-UWB系统窄带干扰抑制 被引量：1

Narrowband Interference Suppression Based on the Fractional Fourier Transform in Chirp Code-Orthogonalized Transmitted-Reference Ultra-Wideband System
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摘要 对基于Chirp的正交码发送参考超宽带(Chirp-COTR-UWB)系统进行研究,推导了窄带单音干扰和窄带BPSK干扰条件下接收机干扰输出分量的表达式,证明了窄带平稳干扰信号经过去斜脉冲压缩后将被展宽成两个具有不同中心频率的非平稳线性调频干扰。采用分数阶Fourier变换的时频分析方法对线性调频干扰进行抑制,并对该系统抗干扰性能进行了仿真分析。结果表明采用FrFT时频方法可有效抑制Chirp-COTR-UWB信号中的窄带干扰,并改善系统的抗干扰性能。 This paper studies the Chirp code-orthogonalized transmitted-reference ultra-wideband （Chirp-COTR-UWB） system, and the mathematical expression of system rec, eiver in the presence of narrowband interference （NBI） is deduced, which proves that after dechirping, the narrowband sta- tionary signal will be spread to two nonstationary linear frequency modulation （LFM） interference signals with different centre frequencies. The fractional Fourier transform （FrFT） is employed to suppress the LFM interference. The anti-jamming performance of the system and the performance af- ter FrFT interference suppression are simulated. The simulation results show that the NBI in Chirp- COTR-UWB system can be effectively suppressed by using the FrFT time-frequency method, and the performance of system can also be improved.
作者 李霞 江桦 张剑
机构地区 信息工程大学信息工程学院
出处 《信息工程大学学报》 2011年第3期283-288,共6页 Journal of Information Engineering University
基金 国家863计划资助项目(2009AA011205) 国家科技重大专项资助项目(2009ZX03006-008)
关键词 基于Chirp的正交码发送参考超宽带系统 线性调频干扰 分数阶FOURIER变换 窄带干 扰 干扰抑制 Chirp code-orthogonalized transmitted-reference ultra-wideband system （Chirp-COTR- UWB） linear frequency modulation （LFM） Fractional Fourier Transform （FrFT） narrowband in- terference （NBI） interference suppression
分类号 TN911.4 [电子电信—通信与信息系统]
  • 相关文献

参考文献17

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二级参考文献28

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共引文献71

同被引文献13

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二级引证文献1

信息工程大学学报
2011年 第3期

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