The use of frequency division duplex (FDD).

使用频分双工(FDD)。

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As the only system using Time Division Duplex in the 3g system, it has some advantages over systems of Frequency Divsion Duplex.

作为3g系统中唯一一个使用时分双工的系统，它具备了许多频分双工系统所不具备的优点。

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This is known as FDD or frequency division duplex.

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