# power of the preamble

In a modulated communication signal, the power of the signal to be sent or received must be equal to 1 to after calculate the BER.

But if I add a preamble at the beginning of the signal for example a chirp (to do the synchronization), does its power must also be equal to 1?

• "must be equal to 1" um, no? If that was the case, you'd always have the same SNR? – Marcus Müller Dec 13 '18 at 16:32