Calculator for carrier to noise vs threshold for DVB-S ,DVB-S2 and DVB-S2X

Updated 29 January 2015

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C+N/N (measured on a spectrum analyzer)

dB
C/N

dB
Symbolrate

kS/s

MBaud
DVB-S2 Pilot

 
FEC

 
Datarate (Useful bitrate)

kbit/s
C/No overall

dB/Hz
Eb/No datarate (useful bitrate)

dB
Es/No

dB
Eb/No (after FEC)

dB
Eb/No bruttobitrate

dB
Eb/No threshold

dB
Es/No Threshold

dB
Link Margin

dB

Set FEC before datarate is set if you want to use datarate instead of symbolrate as input.



Formulas used for DVB-S calculations

Threshold Eb/No and C/N values as specified in ETS 300 421

FEC Eb/No[dB] C/N[dB]

1/2

4.5

4.1

2/3

5.0

5.9

3/4

5.5

6.9

5/6

6.0

7.9

7/8

6.4

8.5

1

9.0

11.7

2002-2012 Jens T. Satre