脱机数据传输是简单地利用电话或类似的链路来传输数据，不包括计算机系统。
Off-line data transmission is simply the use of a telephone or similar link to transmit data without involving a computer system.
为了保证通信链路中数据传输的可靠性与稳定性，需要估计出多普勒频偏，并对其进行修正。
In order to ensure the reliability and stability of the communication link in the data transmission, we have to estimate the Doppler frequency offset, and amend it.
在一种可以用可变速率传输的数据通信系统中，高速率分组数据传输改进了正向链路的应用，并降低了传输延迟。
In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay.
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