Question

Relation between power spectral density and it's correlation

Answer 1

Power spectrum density is basically Fourier transform of auto-correlation function of power signal. This property is helpful for calculating power of any power signal.

the property is -

P = Rff(0). , where P = power of signal and Rff(0) = the value of auto-correlation(Rff)

of signal at t=0.

if Rff is Real and Even then itsPower spectrum density( PSDf) also Real and Even .