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Product specifications

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CDM-Qx Satellite Modem Revision 5
CnCPerformance Characterization MN/CDMQx.IOM
D–4
Figure D-2. QPSK 3/4 Turbo degradation versus relative carrier spacing (for two adjacent carriers)
Figure D-3. 8-PSK 3/4 Turbo degradation versus relative carrier spacing (for two adjacent carriers)
Eb/No Degradation Versus Carrier Spacing
QPSK 3/4 Turbo
α
= 20%
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0.70 0.90 1.10 1.30 1.50
Carrier Spacing Normalized To Symbol Rate
Eb/No Degradation
-3 dB
0 dB
3 dB
6 dB
For Two Equally Space Carriers
Each With Level Relative To
Desired
Eb/No Degradation Versus Carrier Spacing
8-PSK 3/4 Turbo,
α
= 20%
-2.0
-1.8
-1.6
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.80 1.00 1.20 1.40 1.60
Carrier Spacing Normalized To Symbol Rate
Eb/No Degradation
-3 dB
0 dB
3 dB
6 dB
For Two Equally Space
Carriers Each With Level
Relative To Desired
Eb/No Degradation Versus Carrier Spacing
16-QAM 3/4 Turbo,
α
= 20%
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
0.80 1.00 1.20 1.40 1.60
Carrier Spacing Normalized To Symbol Rate
Eb/No Degradation
-3 dB
0 dB
3 dB
6 dB
For Two Equally Space
Carriers Each With Level
Relative To Desired
Eb/No Degradation Versus Carrier Spacing
QPSK 3/4 Turbo,
α
= 35%
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0.70 0.90 1.10 1.30 1.50
Carrier Spacing Normalized To Symbol Rate
Eb/No Degradation
-3 dB
0 dB
3 dB
6 dB
For Two Equally Space Carriers
Each With Level Relative To
Desired
Eb/No Degradation Versus Carrier Spacing
8-PSK 3/4 Turbo,
α
= 35%
-1.4
-1.2
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.80 1.00 1.20 1.40 1.60
Carrier Spacing Normalized To Symbol Rate
Eb/No Degradation
-3 dB
0 dB
3 dB
6 dB
For Two Equally Space
Carriers Each With Level
Relative To Desired
Eb/No Degradation Versus Carrier Spacing
16-QAM 3/4 Turbo,
α
= 35%
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
0.80 1.00 1.20 1.40 1.60
Carrier Spacing Normalized To Symbol Rate
Eb/No Degradation
-3 dB
0 dB
3 dB
6 dB
For Two Equally Space
Carriers Each With Level
Relative To Desired
Figure D-4. 16-QAM 3/4 Turbo degradation versus relative carrier spacing (for two adjacent carriers)