可以在比现有技术更宽的多普勒扩展范围上更精确地估算多普勒极限频率。
The maximum Doppler frequency can be estimated more accurately over a wider range of Doppler spreads than prior art.
多普勒分集将多普勒扩展作为一种分集方式，通过增强信号能量来改善系统性能。
Doppler diversity considers Doppler spread as a way of diversity, and improves the system performance by enhancing the signal energy.
将多普勒分集技术应用于OFDM系统，可以有效地对抗多普勒扩展对系统性能的影响。
Applying Doppler diversity in OFDM system can combat the effect of Doppler spread on system performance.
大量的仿真结果表明，三个分集结合适当的频率变化，降低了误码率的命令时，归一化多普勒扩展是大于0.3。
Extensive simulations show that combining three diversity branches with proper frequency shifts reduces BER by an order when the normalized Doppler spread is larger than 0.3.
在短波信道建模中，通常采用对高斯白噪声滤波来仿真多普勒扩展效应，这些模型的时域相关值与理论值相差较大。
In HF channel modeling, doppler spread effects are usually simulated by filtering white Gaussian noise. The signal correlation in time domain deviates far from the theoretical value.
本发明不但解决了高多普勒扩展的多普勒极限频率的估算问题，而且解决了低多普勒扩展的多普勒极限频率的估算问题。
The invention solves the problem of the estimation of maximum Doppler frequency not only for high Doppler spreads but also for low Doppler spreads.
实例反演也证明了扩展VAP方法的反演性能，与双多普勒雷达反演结果基本一致。
It has further proven the retrieval capability of extended-VAP method via the retrieval example and the comparison with the result of Dual-Doppler analysis.
实例反演也证明了扩展VAP方法的反演性能，与双多普勒雷达反演结果基本一致。
It has further proven the retrieval capability of extended-VAP method via the retrieval example and the comparison with the result of Dual-Doppler analysis.
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