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FDD(Frequency Division Duplexing)是指频分双工,有两个独立的信道,一个用来向下传送信息,另一个用来向上传送信息,两个信道之间存在一个保护频段,以防止邻近的发射机和接收机之间相互干扰。TDD(Time Division Duplexing)是指时分双工,发射和接收信号是在同一频率信道的不同时隙中进行的,彼此之间采用一定的保证时间予以分离。
Frequency Division Duplexing (FDD) refers to frequency division duplexing and has two independent channels, one for transmitting information downward and the other for transmitting information upward. There is a guard band between the two channels to prevent adjacent Interference between transmitter and receiver. Time Division Duplexing (TDD) refers to time division duplexing. Transmitting and receiving signals are carried in different time slots of the same frequency channel, and are separated from each other by a certain guarantee time.