The FrequencyShiftKeying modulation is widely used in HF digital communication.
控是短波数字通信中常用的一种调制方式。
2
The Continuous Phase FrequencyShiftKeying (CPFSK) signaling scheme has been widely used in mobile applications.
连续相位频移键控(CPFSK)信号广泛应用于便携式移动通信系统。
3
And the method of DDWS (direct digital wave synthesis) is adopted to realize the signals of MFSK (multi-frequencyshiftkeying) and OFDM (orthogonal frequency division multiplexing).