But this method occupies the special sub-carriers or time slots and then reduces the system spectrum efficiency and data transmission rate.

但该方法占用专门的子载波或时隙，降低了系统的频谱利用率和信息传输速率。

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But this method occupies the special sub-carriers or time slots and then reduces the system spectrum efficiency and data transmission rate.

但该方法占用专门的子载波或时隙，降低了系统的频谱利用率和信息传输速率。

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