I have a frequency modulated signal which must contain only $ g(t)=B.\cos(\omega(t).t+\phi)$, but it gets the form as below
$$ f(t)=B.\cos(\omega(t).t+\phi)+A_1.\cos(\omega(t-t_1).t+\phi_1)+A_2.\cos(\omega(t-t_2).t+\phi_2)+...$$ where $$A_k<<B$$ $\omega(t)$ values are limited (for instance, it would get values $950<\omega(t)<1050$)
I am going to extract $g(t)$ from $f(t)$. Any suggestion? Note that all sines are in the same frequency bandwidth, therefore filtering does not work.
thank you for your kind replies, in advance.