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CDM-Qx Satellite Modem
CnCPerformance Characterization
Eb/No Degradation Versus Carrier Spacing
QPSK 3/4 Turbo α = 20%
0
-0.5
-1
-1.5
-2
-2.5
-3
-3.5
-4
0.70
0.90
Carrier Spacing Normalized To Symbol Rate
Figure D-2. QPSK 3/4 Turbo degradation versus relative carrier spacing (for two adjacent carriers)
Eb/No Degradation Versus Carrier Spacing
8-PSK 3/4 Turbo, α = 20%
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
-1.6
-1.8
-2.0
0.80
1.00
Carrier Spacing Normalized To Symbol Rate
Figure D-3. 8-PSK 3/4 Turbo degradation versus relative carrier spacing (for two adjacent carriers)
Eb/No Degradation Versus Carrier Spacing
16-QAM 3/4 Turbo, α = 20%
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
0.80
1.00
Carrier Spacing Normalized To Symbol Rate
Figure D-4. 16-QAM 3/4 Turbo degradation versus relative carrier spacing (for two adjacent carriers)
For Two Equally Space Carriers
Each With Level Relative To
Desired
1.10
1.30
1.50
For Two Equally Space
Carriers Each With Level
Relative To Desired
1.20
1.40
1.60
For Two Equally Space
Carriers Each With Level
Relative To Desired
1.20
1.40
1.60
Eb/No Degradation Versus Carrier Spacing
0
-0.5
-1
-3 dB
-1.5
0 dB
-2
3 dB
-2.5
6 dB
-3
-3.5
-4
0.70
Carrier Spacing Normalized To Symbol Rate
Eb/No Degradation Versus Carrier Spacing
0.0
-0.2
-0.4
-3 dB
-0.6
0 dB
3 dB
-0.8
6 dB
-1.0
-1.2
-1.4
0.80
Carrier Spacing Normalized To Symbol Rate
Eb/No Degradation Versus Carrier Spacing
0.0
-0.5
-1.0
-3 dB
-1.5
0 dB
-2.0
3 dB
-2.5
6 dB
-3.0
-3.5
-4.0
0.80
Carrier Spacing Normalized To Symbol Rate
D–4
Revision 6
MN/CDMQx.IOM
QPSK 3/4 Turbo, α = 35%
For Two Equally Space Carriers
Each With Level Relative To
Desired
0.90
1.10
1.30
8-PSK 3/4 Turbo, α = 35%
For Two Equally Space
Carriers Each With Level
Relative To Desired
1.00
1.20
1.40
16-QAM 3/4 Turbo, α = 35%
For Two Equally Space
Carriers Each With Level
Relative To Desired
1.00
1.20
1.40
-3 dB
0 dB
3 dB
6 dB
1.50
-3 dB
0 dB
3 dB
6 dB
1.60
-3 dB
0 dB
3 dB
6 dB
1.60
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