OFDM (Orthogonal frequency Division Multiplexing) systems are sensitive to frequency offset, which will degenerate the system performance.

正交频分复用(OFDM)通信系统对频率偏移比较敏感，容易导致系统性能急剧下降。

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The OFDM (Orthogonal Frequency Division Multiplexing) multi-carrier modulation is used to process messages instead of the traditional single carrier modulation.

提出利用正交频分复用(OFDM)多载波调制方式代替单载波调制方式对信息进行处理。

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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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