The open loop transmit diversity scheme, named as STTD, and two feedback close loop transmit diversity schemas in downlink channel communication was defined in WCDMA standard.
WCDMA标准在下行信道传输中采用了称作STTD的开环发射分集方案和两种反馈模式的闭环发射分集方案。
With the help of the method, the control accuracy similar to that of close loop system can be obtained and the system has the same stability as that of open loop system.
采用这种控制方式，可以获得类似闭环系统的控制精度和开环系统的稳定性。
The control of ignition advance Angle is mostly open-loop control and the control data is obtained from experiment. Close-loop control method is applied to avoid engine knock.
对点火提前角的控制主要是开环控制，控制数据由试验得到，对爆震现象采取了闭环控制。
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