Table 6-6. Turbo Product Coding Summary - Comtech EF Data CDM-Qx Installation And Operation Manual

CDM-Qx Satellite Modem
Forward Error Correction Options
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.
Exceptionally good BER performance - significant improvement
compared with every other FEC method in use today
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

Table 6-6. Turbo Product Coding Summary

FOR
6–8
Revision 6
MN/CDMQx.IOM
AGAINST
Nothing!