Hi,
These are just my own educated guesses, so read at your own risk
.
I think the LO phase noise will directly add to the phase noise of the output signal. But for the SNR, it would depend on the signal itself. In your case, since you are using a frequency modulation, you need to see the effect of the phase noise on the output frequency. Following this,
http://en.wikipedia.org/wiki/Frequency_modulationI guess you can say the signal phase without the carrier is equal to 2πΔf∫x(τ)dτ + φ
n(t). So that would make the signal frequency equal to 2πΔfx(t) + d/dt[φ
n(t)]. So if I were doing the calculation without having read a book on communications theory, I would get my frequency domain phase noise plot, and multiply by 2πf, then integrate over frequency to get the noise power. I guess the signal power would simply be (2πΔf)
2.
Probably a book on communications theory would give you a better answer.
Aaron