Below are given the minimal carrier-to-noise ratio values required to lock the signal broadcast in DVB-S2 standard with QPSK, 8PSK, 16APSK and 32APSK modulations. C/N [dB] values differs because of FEC (Forward Error Correction) code rate.
Notice that in the second generation of DVB-S system, required values of C/N are lower for the same forward error correction code rate with QPSK modulation.
Minimum carrier to noise ratio values (CNR, C/N) for DVB-S2 system
Are you looking for C/N ratio values for DVB-S2/QPSK, DVB-S2/8PSK, DVB-S2/16APSK and DVB-S2/32APSK systems?
In telecommunications, the carrier-to-noise ratio, often written CNR or C/N, is the signal-to-noise ratio (SNR) of a modulated signal. The term is used to distinguish the CNR of the radio frequency passband signal from the SNR of an analogue base band message signal after demodulation, for example an audio frequency analogue message signal. If this distinction is not necessary, the term SNR is often used instead of CNR, with the same definition.
source: ETSI, Wikipedia, satbroadcasts.com
based on: ETSI EN 302 307 V1.3.1 - "Digital Video Broadcasting (DVB); Second generation framing structure, channel coding and modulation systems for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications (DVB-S2)"