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CDM-Qx Satellite Modem Revision 5
Forward Error Correction Options MN/CDMQx.IOM
6–9
It can be seen that the 8-PSK Rate 3/4 Turbo performance closely approaches that of the
Rate 2/3 TCM/Reed-Solomon case – the BER performance is within approximately 0.4
dB. However, it should be noted that the Rate 3/4 Turbo mode is 20% more bandwidth
efficient than the TCM case. The additional advantages of Turbo (lower delay,
performance during fades etc) should also be considered.
Table 6-6. Turbo Product Coding Summary
FOR AGAINST
Exceptionally good BER performance - significant improvement compared
with every other FEC method in use today
Nothing!
No pronounced threshold effect - fails gracefully
Exceptional bandwidth efficiency
Coding gain independent of data rate (in this implementation)
Low decoding delay
Easy field upgrade in Modem