DVB-S & DVB-S2 Bitrates Calculator

Updated 23 August 2006

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3dB Satellite Bandwidth(approx.)

MHz
Occupied Satellite bandwidth

MHz
Spectral Efficiency

Bit/Hz
Modulators Nyquist filter rolloff factor
( =0.4 when not known- 0.35 for DVB-S)

 
DVB-S2 Pilot

 
DVB-S2 Frame

 
Forward Error Correction

 
Bit/symbol

Bit/symbol
Symbol Rate

MBaud
Allocated bandwidth

MHz
Symbol Rate        8-PSK 3 bits/symbol MBaud
Allocated 8-PSK bandwidth MHz
DVB-C Symbol Rate    16-QAM 4 bits/symbol MBaud
Allocated 16-QAM bandwidth MHz
DVB-C Symbol Rate    32-QAM 5 bits/symbol MBaud
Allocated 32-QAM bandwidth MHz
DVB-C Symbol Rate DVB-C   64-QAM 6 bits/symbol MBaud
Allocated 64-QAM bandwidth MHz
DVB-C Symbol Rate  128-QAM 7 bits/symbol MBaud
Allocated 128-QAM bandwidth MHz
DVB-C Symbol Rate  256-QAM 8 bits/symbol

MBaud
Allocated 256-QAM bandwidth MHz
Netto Transport Stream Bitrate

MBit/s
Bitrate with Reed Solomon encoding
Packet length 204 bytes
(DVB-S/C only)

MBit/s
DVB-S & DVB-S2 Brutto Bitrate

MBit/s

 

Calculation is based on which variable that has changed value.
Put the cursor in another field to trig the OnChange calculations!
By browsing trough different FEC values it is allocated bandwidth/symbolrate that is keept to the same value.

DVB-S/DVB-C ,  ETSI TR 101 290: :

For DVB compliant systems the QAM/QPSK passband spectrum is shaped by root raised cosine filtering with a roll-off 
factor alpha () of 0,15 for DVB-C systems, or 0,35 for DVB-S systems. For an ideal QAM/QPSK system this means 
that all the RF/IF power will lie in the frequency bandwidth:
Allocated bandwidth = Symbolrate*(1+alpha() )

Roll off as specified by Intelsat:

Intelsat Earth Station Standard 420: (IESS420e.PDF): 
Allocated Bandwidth= (1+Nyquist rolloff factor)*Symbolrate
Nyquist rolloff factor =0,4 used when rolloff factor is unknown.


Note: 1Mbit/s = 1 000 000 bit/s

   20©06 Jens T. Satre

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