移动通信多普勒频移与高铁覆盖技术 -文本浏览模式- 文档 - 枢研网 关键词：高铁通信；多普勒扩频；衰落信道 [gap=509]Keywords：High speed railway communication; Doppler spread spectrum; Fading channel
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Aiming at the acquisition problem of direct sequence spread-spectrum (DSSS) signals with large Doppler offset, a new method based on fast Fourier transform (FFT) is proposed.
针对具有大多普勒偏移的直接序列扩频信号捕获问题，提出一种基于快速傅里叶变换(FFT)的多普勒和伪码分别并行搜索的捕获新方法。
The wireless propagation environment is described first: analyzing the small-scaled fading, including amplitude fading, multi-path time delay and Doppler spectrum spread.
在本论文中，首先对移动传播环境作了描述，特别是对小尺度多径传播造成的幅度衰落，多径时延和多普勒频移进行了分析；
The spread and compress of millimeter wave pulse frequency spectrum will happen in Doppler Effect during rain.
在降雨条件下，多普勒效应后毫米波脉冲频谱发生展宽和压缩。
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