高数据传输速率以及终端的高速移动，导致无线通信信道具有时间选择性与频率选择性两个特征。
High data transmission rates and high mobility give rise to time - and frequency - selectivity in wireless communication channels.
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。
The frequency time selective fading resulted from multipath dispersion and Doppler frequency shift is an important characteristic of urban mobile radio channel.
一般的，信道既是频率选择性的又是时间选择性的。
Generally the channel is both frequency selective and time selective.
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.
提出了一种适用于时间频率选择性衰落信道的MIMO - OFDM系统的组合信道估计方法。
A combined channel estimation method of time-frequency-selective fading channels in MIMO-OFDM systems was proposed.
但是，对于这样高速率的传输，信道会由于具有不同延迟时间的多条干扰路径的存在而呈现出严重的频率选择性。
However, for such high-speed data transmissions, the channel is severely frequency-selective due to the presence of many interfering paths with different time delays.
时变色散信道则是同时存在频率和时间选择性衰落的信道。
A time-varying disperse channel is a channel that contain both frequency selective fading and time selective fading.
时变色散信道则是同时存在频率和时间选择性衰落的信道。
A time-varying disperse channel is a channel that contain both frequency selective fading and time selective fading.
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