PAR of constant envelope modulations (FSK,GMSK)

[nazanin.gharib62]

Hi to All,
I have 2 questions about PAR.

1) Is it right to say that the constant envelope modulations such as FSK or GMSK PAR value is equal to 0dB?

2) Crest factor for a sin wave is 3.01 dB.
https://en.wikipedia.org/wiki/Crest_factor

Why Crest factor for a FM modulated signal is 0dB.

**broken link removed**

the FM signal basically is a single sinusoidal carrier. Is not it?



Could you please clarify the difference in PAR values for a sine wave and FM signal??

Thanks in advance...!!!!