spatial frequency spectrum

The research on OFDM spectrum sensing algorithm utilizes only the time diversity and frequency diversity to improve detection performance without utilizing spatial diversity.

目前针对OFDM信号的频谱感知算法研究只利用时域分集和频域分集提升检测性能，而没有考虑利用空间分集提升检测性能。

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Altimeter data were corrected with tidal model and was interpolated in spatial domain to obtain time series data. 3D energy-frequency-time spectrum and sea surface anomaly ( SSA) were obtained by HHT from time series data.

对南海卫星高度计资料进行潮汐校正和空间插值得到时间序列数据，对这些时间序列数据进行HHT，得到了南海海平面高度变化的三维能量-频率-时间谱和海平面高度距平（SSA）。

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spatial frequency spectrum analysis of the performance of the diffractive optical element for beam smoothing

衍射光学束匀滑器件性能的空间频谱分析

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By analysis of the intermediate frequency signals which through eight antennae and receiver channels, eight channels radio spatial spectrum direction finding system can reach the purpose of finding radio direction.

八通道无线电空间谱测向系统通过分析经过八路天线和接收机通道以后的中频信号达到确定无线电信号方向的目的。

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It can obtain time diversity, spatial diversity and frequency diversity at the same time. So it not only can effectively combat the frequency selective fading in the course of spread, but also the spectrum efficiency is greatly improved.

它将时间分集、空间分集和频率分集有机地结合起来，不仅可以有效地抵抗信号传播过程中遭遇的频率选择性衰落，而且频谱利用率得到很大地提高。

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