正交频分复用系统的上行同步需要测距来完成。

Up-link synchronization in OFDM system is completed by ranging.

youdao

上行同步的维持是根据收到的下行链路的定时，发送上行链路定时提前量来实现的。

Uplink synchronization is maintained in 1.28 Mcps TDD by sending the uplink advanced in time with respect to the timing of the received downlink.

youdao

上行同步的维持是根据收到的下行链路的定时，发送上行链路定时提前量来实现的。

Uplink synchronization is maintained in 1.28 Mcps TDD by sending the uplink advanced in time with respect to the timing of the received downlink.

youdao