适合环回测试电缆的循环后的信号到达终端设备端口。
The fit loopback tests the cable by looping the signal back after it reaches the DTE port.
利用天线阵列对同一信源信号经过多径传输到达终端的时间时延、角度和强度进行了联合估计。
In multipath propagation model, arrival Angle, delay and strength received by an antenna array for same signal source are estimated.
本发明只对基站和终端进行少量修 改，实现ETWS主要消息通知在4秒内到达终端的时延要求。
The invention meets a delay requirement on the main notification message of the ETWS reaching the terminal within 4 seconds by only modifying the base station and the terminal slightly.
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