phase-shift keying

例句：

1. 1.In wireless communication, phase-shift keying is used to modulate the frequency of a signal.
   在无线通信中，相位移位键控用于调制信号的频率。
2. 2. The phase-shift keying technique is widely used in digital communications.
   相位移位键控技术广泛应用于数字通信中。
3. 3. The phase-shift keying system was developed to improve the efficiency of data transmission.
   相位移位键制系统被开发出来以提高数据传输的效率。