mod_fsk.m

基带数字信号通过成形滤波（选用升余弦滚降函数）然后进行载波调制

function s_fsk=mod_fsk(d,sample,fb,fc,delta_f)

f1=fc-delta_f;f2=fc+delta_f;fs=fb*sample;
N=length(d);M=sample;


for j=1:N
    if(d(j)==0)
        for i=1:M
            s_fsk((j-1)*M+i)=cos(2*pi*f1*(i-1)/M/fb);
        end
    else
        for i=1:M
            s_fsk((j-1)*M+i)=cos(2*pi*f2*(i-1)/M/fb);
        end
    end
end