CDM-Qx Satellite Modem
Revision 6
CnCPerformance Characterization MN/CDMQx.IOM
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
E
b/
N
o D
e
gr
a
da
ti
o
n
-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
E
b/
N
o D
e
gr
a
da
ti
o
n
-3 dB
0 dB
3 dB
6 dB
For Two Equally Space Carriers
Each With Level Relative To
Desired
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%
-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
E
b
/N
o D
egr
ada
ti
on
-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
E
b
/N
o D
egr
ad
at
io
n
-3 dB
0 dB
3 dB
6 dB
For Two Equally Space
Carriers Each With Level
Relative To Desired
Figure D-3. 8-PSK 3/4 Turbo degradation versus relative carrier spacing (for two adjacent carriers)
Figure D-4. 16-QAM 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%
-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
E
b
/N
o
D
eg
rad
at
io
n
-3 dB
0 dB
3 dB
6 dB
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
E
b
/N
o D
egr
ad
at
io
n
-3 dB
0 dB
3 dB
6 dB
For Two Equally Space
Carriers Each With Level
Relative To Desired
For Two Equally Space
Carriers Each With Level
Relative To Desired
D–4
Содержание CDM-Qx
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