频率选择性衰落（Frequency selective fading），是指在不同频段上衰落特性不一样。当频率超过相干带宽时发生频率选择性衰落。
频率选择性衰落信道 frequency selective fading
非频率选择性衰落信道 Frequency-nonselective fading channel
频率选择性瑞利的衰落 FSRF
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同时具有时间和频率选择性衰落的信道，我们称之为双衰落信道。
The time- and frequency- selective fading channel is so-called doubly selective fading channel.
因此在频率选择性衰落信道中，采用分集接收可以改善系统的捕获性能。
Therefore, system acquisition performance can be improved if diversity receiver is adopted for the frequency-selective fading channel.
提出一种基于信号子空间估计，用于频率选择性衰落信道的盲多用户自适应接收机。
In this paper, a blind multiuser receiver for frequency-selective fading channel based on subspace tracking has been presented.
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