| 大Doppler频移条件下基于导频信号的扩频码捕获 |
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| 引用本文： | 吴团锋,朱爱民.大Doppler频移条件下基于导频信号的扩频码捕获[J].电子与信息学报,2005,27(6):861-864. |
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| 作者姓名： | 吴团锋 朱爱民 |
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| 作者单位： | 通信工程学院全军卫星通信重点实验室,210007,南京 |
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| 摘 要： | 分析了Doppler频移对传统扩频码捕获算法的影响,提出了在发送导频信号期间,利用自适应谱线增强器(ALE)对部分匹配滤波输出进行处理以估计Doppler频移值,经过频偏校正后,采用传统全匹配捕获算法进行扩频码捕获判决的新方法。仿真结果表明,这种方法可以有效地消除大Doppler频移的影响,迅速完成扩频码的捕获。
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| 关 键 词： | 扩频码 大Doppler频移 部分匹配滤波器 自适应谱线增强器 |
| 文章编号： | 1009-5896(2005)06-0861-04 |
| 收稿时间： | 2004-1-6 |
| 修稿时间： | 2004年1月6日 |
Spread-Spectrum Code Acquisition Based on Pilot Symbols in the Presence of Large Doppler Shift |
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| Wu Tuan-feng,ZHU Ai-min.Spread-Spectrum Code Acquisition Based on Pilot Symbols in the Presence of Large Doppler Shift[J].Journal of Electronics & Information Technology,2005,27(6):861-864. |
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| Authors: | Wu Tuan-feng ZHU Ai-min |
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| Affiliation: | Army Key Laboratory on Satellite Communications, ICE, Nanjing 210007, China |
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| Abstract: | The influence of Doppler shifts on traditional acquisition algorithms is analyzed. A new method for spread-spectrum code acquisition of pilot symbols in the presence of large Doppler shifts is proposed, in which the outputs of partial matched filters are delivered to an Adaptive Line Enhancer (ALE) directly and an estimated frequency is produced. After frequency offset compensation, spread-spectrum code acquisition is performed by traditional spread-spectrum code acquisition algorithm. Simulation results show that the new method eliminates the influence of large Doppler shifts effectively, with fast acquisition time. |
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| Keywords: | Spread-spectrum code Large Doppler shift Partial matched filter Adaptive Line Enhancer (ALE) |
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