The frequency time selective fading resulted from multipath dispersion and Doppler frequency shift is an important characteristic of urban mobile radio channel.

由多径色散及多普勒频移造成的频率—时间选择性衰落是城市移动无线信道的一个重要特性。

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If the time interval among the transmissions is long enough for each time, the fading presented by the transmission of the signal will be mutual for each time.

如果各次发送的时间间隔足够大，那么各次发送信号所出现的衰落将是彼此的。

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Time-selective Rayleigh fading of channels is caused by Doppler shift and carrier frequency offset.

接收端的高速运动或者载频的偏移，会引起信道的时间选择性衰落。

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At the same time loyalty to employers is fading.

ECONOMIST: The battle for brainpower

Meanwhile, a ticking statute of limitations means that the time to file criminal charges against Cohen is fading for a substantial portion of the allegedly illegal trades.

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Social scientists have discovered that we think about a decision quite differently when we are predicting how we will behave than when we have to act, a difference that is driven both by different motivations at these two points in time and by the process of ethical fading.

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