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Conversion Mbps to Msps

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Posts: 24
Oct 14th, 2009 at 12:08pm  
Dear all, how to calculate
Out bound 45 Mbps to .... Msps
In bound 2 Mbps to ...Msps

Assume ;
Modulasi In bound 8 PSK, FEC 7/8
Modulasi out bound QPSK, FEC 1/2

Tagor Muda
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Eric Johnston
Senior Member

Posts: 2109
Reply #1 - Oct 14th, 2009 at 12:59pm  
SR = Symbol Rate
DR = Data Rate = the information rate. This is the same as the customer information rate if there is no framing, packet header, supervisory, conditional access or encryption overhead added to the data stream in the modem.  DVB modems and IP packets add significant overheads.
CR = FEC Code Rate.  Eg. 5/16, 21/44, 1/2, 2/3, 3/4, 5/6, 7/8, 188/204, 0.95
m = modulation factor (transmission rate bits per symbol).   BPSK=1, QPSK=2, 8PSK=3, 8QAM =3, 16QAM=4 etc  

Formula:   SR = DR / (m x CR)

Best regards, Eric.
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