The essential difference between nonlinear modulation and linear modulation is that linear modulation does not change the original spectrum structure of the signal, while nonlinear modulation changes the original spectrum structure of the signal.
In addition, nonlinear modulation often occupies a wide bandwidth.
frequency modulation（FM），narrowbandFrequency modulation (such as civil interphone) and broadband frequency modulation (FM broadcasting) belong to the category of nonlinear modulation.
As mentioned earlier, nonlinear modulation usually occupies a wide range ofbandwidthAnd the bandwidth actually occupied by theModulation coefficientinfluence.
It can be seen that nonlinear modulation has higheranti-interferenceAbility.
In addition, at the receiving end, it can be filtered by limiting amplitude and other meanschannelThe interference generated enables nonlinear modulation to obtain higher anti-interference capability.
