high speed underwater communications
... 水下通信系统 underwater communications system 高速水下通信 High Speed Underwater Communications 水下语言通信 underwater speech communication ...
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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。
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.
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