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What do you mean by “base band”?
If you mean the “simplest band limited signal” (SBLS) that means to generate a signal with two spectral components., e.g:
A = Am*sin(w*t+phi)+B
* “the constant signal” sometimes associated with “direct current” and with frequency 0Hz.(B = constant)
* sinusoidal or co-sinusoidal component with determined function, amplitude, frequency and phase, sometimes called” alternative current” component.
If you do not mean SBLS you should give the formula of your “base band signal”.
But normally a “band” means at least two frequency components? OK?
I hope that I clear and useful.