CDM-750 Advanced High-Speed Trunking Modem
Revision 2
Appendix C
MN-CDM750
C–13
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
Sp
e
ct
ra
l
Eff
ici
e
n
cy
(B
p
s/
H
z)
Es/No
(dB)
32APSK
16APSK
8PSK
QPSK
Pruned ModCods
Appear
On
Baseline
presents
a
practical
set
of
ModCods
based
on
ModCod
selection.
The
pruned
or
inactive
ModCods
are
shown
along
the
baseline
of
the
plot.
The
transition
to
the
next
higher
ModCod
is
the
Es/No
(spec)
+
Es/No
Target
Margin
(user
selected)
+
hysteresis
(0.5
dB)
+
modulation
impairment
(user
selected),
while
a
step
down
is
the
Es/No
(spec)
+
Es/No
Target
Margin
+
modulation
impairment.
In
the
example,
the
Target
Es/No
Margin
and
Modulation
Impairment
are
zero.
Figure C-6. Spectral Efficiency vs. Modem Es/No @ QEF (Pruned ModCods)
Summary of Contents for CDM-750
Page 76: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Updating Firmware MN CDM750 4 12 Notes...
Page 224: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix A MN CDM750 A 4 Notes...
Page 234: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix B MN CDM750 B 10 Notes...
Page 256: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix C MN CDM750 C 22 Notes...
Page 280: ...CDM 750 Advanced High Speed Trunking Modem Revision 2 Appendix D MN CDM750 D 24 Notes...
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