Because the frequency modulation isn’t sensitive with the change of the phase, it can overcome the swift of phase and fading of energy which is caused by water channel.
利用频率调制本身对于相位变换不敏感的特性,抑制了水声信道中多途效应引起的相位偏移以及能量衰减。
参考来源 - 基于FPGA的水声通信技术研究与实现Pulse width modulation, frequency modulation as wel as phase modulation are simulated by the system model. These modulating methods are analyzed and their correlation results are compared.5.
4.基于ARMA系统模型对脉冲宽度调制、频率调制和相位调制等方法进行仿真,分析了三种调制方式的传输特性,并比较了各自的相关结果。
参考来源 - 无串扰超声测距系统建模与仿真·2,447,543篇论文数据，部分数据来源于NoteExpress
N a method of transmitting information using a radio-frequency carrier wave. The frequency of the carrier wave is varied in accordance with the amplitude and polarity of the input signal, the amplitude of the carrier remaining unchanged 调频广播 ( abbr: FM) → compare amplitude modulation
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