【通信】多进制数字频率调制（4FSK）含Matlab源码.zip

% 主要功能：实现4FSK调制 % s :输入的整型序列【0-3】，f0,f1,f2,f3:分别代表4个载波 %nSamples, 每个符号的采样个数，必须为偶数 s=randint(1,10,4); f0=1;f1=2;f2=4;f3=8; nSamples=100; t=0:2*pi/99:2*pi;% 注意t长度与 nSamples 长度一致 cp=[];mod=[];bit=[]; for n=1:length(s) if s(n)==0 cp1=ones(1,nSamples);c=sin(f0*t); bit1=zeros(1,nSamples); % 00 elseif s(n)==1 cp1=ones(1,nSamples);c=sin(f1*t); bit11=zeros(1,nSamples/2); %01 bit12=ones(1,nSamples/2); bit1=[bit11 bit12]; elseif s(n)==2 cp1=ones(1,nSamples);c=sin(f2*t); bit11=ones(1,nSamples/2); %10 bit12=zeros(1,nSamples/2); bit1=[bit11 bit12]; else s(n)==3 cp1=ones(1,nSamples);c=sin(f3*t); bit11=ones(1,nSamples/2); %11 bit12=ones(1,nSamples/2); bit1=[bit11 bit12]; end cp=[cp cp1]; mod=[mod c]; bit=[bit bit1]; end y=cp.*mod; subplot(2,1,1); plot(bit,'LineWidth',1.5);grid on; ylabel('Binary signal'); axis([0 nSamples*length(s) -0.5 1.5]); title('输入的二进制信号'); subplot(2,1,2); plot(y,'LineWidth',1.5);grid on; ylabel('FSK Modulation'); axis([0 nSamples*length(s) -1.5 1.5]); title('输出的4FSK信号');