FM.zip_FM调制功率谱_brotherf3m_thouz2l_信号调制_通信原理

%Generating FM signal clc clear all; close all; %use orthogonal modulation generate modulated siganl %You can see the original signal v in the code. fc=1e4; %carrier frequency fs=1e5; %sample frequency T=1/fs; %sample time L=500; %length of signal t=(0:L-1)*T; %time vector A=1; %%Ampltitude v=A*cos(2*pi*1000*t); %modulation signal xs=sin(2*pi*fc*t); xc=cos(2*pi*fc*t); %FM K_omega=0.5; %freq offet index phi_fm=zeros(1,length(v)); for n=3:length(v) phi_fm(n)=K_omega/(2)*(v(1)+v(n)+2*sum(v(2:n-1))); end y_fm=cos(2*pi*fc.*t+phi_fm); figure(1) plot(y_fm) title('K_omega=0.3'); figure(2) plotSpectral(y_fm,fs)