And the method of DDWS (direct digital wave synthesis) is adopted to realize the signals of MFSK (multi-frequency shift keying) and OFDM (orthogonal frequency division multiplexing).
采用DDWS(直接数字合成)方法，产生了MFSK (m元频移键控)和OFDM(正交频分复用)两种水声通信信号。
Binary Code Frequency Shift Keying?
二进制代码移频键控BCFSK ？
The Frequency Shift Keying 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。
The Continuous Phase Frequency Shift Keying (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。
For the conventional modulation and demodulation of Minimum Frequency Shift Keying (MSK), the new models for modu - lation and demodulation on digital MSK based on VHDL are developed.
针对传统的最小频移键控(MSK)的调制解调方式，提出一种基于甚高速硬件描述语言(VHDL)的数字式MSK调制解调模型。
The minimum (frequency) shift keying (MSK) is a digital modulation with good performance.
最小频移键控（MSK）是一种性能较优的数字调制。
The minimum (frequency) shift keying (MSK) is a digital modulation with good performance.
最小频移键控（MSK）是一种性能较优的数字调制。
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