Minimum carrier to noise ratio values (CNR, C/N) for DVB-S system - satbroadcasts.com
Minimum carrier to noise ratio values (CNR, C/N) for DVB-S system
Are you looking for C/N ratio values for DVB-S/QPSK system?
 
Below are given the minimal carrier-to-noise ratio values required to lock the signal broadcast in DVB-S standard with QPSK modulation. C/N [dB] values differs because of FEC (Forward Error Correction) code rate.

StandardModulationFECC/N [dB]
DVB-SQPSK1/22.7
2/34.4
3/45.5
5/66.5
7/87.2
Table 1. C/N values in DVB-S system
 
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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 300 421 V1.1.2: "Digital Video Broadcasting (DVB); Framing channel coding and modulation for 11/12 GHz satellite services"
 
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