... frequency jumping 频率跃变 frequency keying method 频率键控法 frequency modulation Doppler 调频的多普勒系统 ...
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frequency interleaved keying method 频率键控法
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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。
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