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。
It's time for a shift in approach to radio design to meet modern requirements.
现在是该改变无线电设计以满足现代需求的时候了。
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