An underwater acoustic modem system is built by employing DSP Software based on M-ary frequency-shift-key (MFSK) modulation and non-coherent detection.
采用DSP软件方法，研制了一套基于MFSK调制和非相干能量检测的水声调制解调系统。
Based on the characters of long rang underwater acoustic channels and MFSK modulation, a new Frequency Group Coding (FGC) method is proposed in this paper.
本文针对远程水下信道和MFSK调制的特点，提出了一种新的频率分组编码(FGC)方法。
Because of limited frequency band of channel, spread spectrum and MFSK modulations can not resolve that high speed transmission is in contradiction with limited frequency band.
当进行高速水下通信时，由于水下信道的频带有限，扩频和MFSK调制方式无法解决高速率信息传输和可利用信道频带窄的矛盾。
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。
To solve this problem, a new classification algorithm was proposed in this paper, which made wavelet transform on MFSK and 8psk at first, and then used four-order cumulants recognition.
针对此问题，提出了一种基于小波和高阶累积量相结合的分类算法，先对MFSK与8ps K信号进行小波变换，再利用四阶累积量进行识别。
To solve this problem, a new classification algorithm was proposed in this paper, which made wavelet transform on MFSK and 8psk at first, and then used four-order cumulants recognition.
针对此问题，提出了一种基于小波和高阶累积量相结合的分类算法，先对MFSK与8ps K信号进行小波变换，再利用四阶累积量进行识别。
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