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。

youdao

youdao

youdao

Spectrum comes in different shapes and sizes (well, different frequencies and bandwidths, to be precise) and a machine system needs spectrum with very particular characteristics.

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Son successfully built a system in Japan using that same spectrum position.

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