Figure 9-4. Qpsk 3/4 Turbo Degradation Versus Relative Carrier Spacing (For Two Adjacent Carriers); Figure 9-5. 8-Psk 3/4 Turbo Degradation Versus Relative Carrier Spacing (For Two Adjacent Carriers); Figure 9-6. 16-Qam 3/4 Turbo Degradation Versus Relative Carrier Spacing (For Two Adjacent Carriers) - Comtech EF Data CDM-Qx Installation And Operation Manual

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier®
DoubleTalk™ Carrier-in-Carrier® (CnC)

Figure 9-4. QPSK 3/4 Turbo degradation versus relative carrier spacing (for two adjacent carriers)

Figure 9-5. 8-PSK 3/4 Turbo degradation versus relative carrier spacing (for two adjacent carriers)

Figure 9-6. 16-QAM 3/4 Turbo degradation versus relative carrier spacing (for two adjacent carriers)

Other QPSK turbo code rates have similar performance and the QPSK plots above are used to
estimate their performance. The degradation plots above are also used for other turbo 8-PSK and
16-QAM code rates. A good practice for carrier spacing is to operate the links with sufficient
spacing so there is no degradation.
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Revision 7
MN/CDMQX.IOM