| 摘要: |
| 提出一种直接序列扩频(DSSS)系统中基于Chirp-Fourier变换的扫频干扰(LFM)抑制算法，Chirp-Fourier变换可以有效地估计出加入噪声的LFM的初始频率和扫频率，从而可以设计出自适应的干扰抑制接收机。仿真分析表明，该方法可获得较好的误码率性能，和其它基于二维时频分析工具的滤波算法相比，不仅干扰抑制的效果好，而且可利用快速傅里叶变换(FFT)实现，提高了处理速度。 |
| 关键词: 扩频通信 直接序列扩频 Chirp-Fourier变换 干扰抑制接收机 算法 |
| DOI：10.3969/j.issn.1001-893X. |
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| 基金项目:河南省自然科学基金资助项目(2000510002) |
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| Frequency Sweeping Interference Suppressing in DSSS System Using Chirp-Fourier Transform |
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| Abstract: |
| An algorithm for suppressing the frequency sweeping interference in Direct Sequence Spread Spectrum(DSSS) system using Chirp-Fourier transform is proposed. Chirp-Fourier transform is used as an effective technique for the detection and parameter estimation of chirp signals, and a DSSS receiver with adaptive time-varying filter is presented. The simulations show that remarkable improvement in Bit Error Rate is obtained, and compared with other two-dimensional time-frequency interference suppressing algorithms, it is better in the interference suppressing, and easier in implementation. |
| Key words: Spread spectrum communication,Direct sequence spread spectrum(DSSS),Chirp-Fourier transform,Interference suppressing receiver,Algorithm |
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