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CDM-Qx Satellite Modem
Summary of Specifications
A.2
Demodulator
FEC, Data rate range, operating modes, descrambling, input impedance/return loss etc, as
per Modulator
-15 to -45 dBm, < 2.048 Msps (desired carrier)
Input power range
-15 to -40 dBm, > 2.048 and < 4.096 Msps (desired carrier)
(70/140MHz IF)
-15 to -35 dBm > 4.096 Msps (desired carrier)
+35 dBc maximum composite, up to -5 dBm
-130 + 10log(Symbol Rate in Hz) minimum signal level
Input power range
50dB AGC range
(L-Band)
±1 to ±32 kHz, Symbol rate > 64 ksps (70/140 MHz)
Acquisition range
±1 to ± (Symbol rate/2) kHz , Symbol Rate <=64 ksps (70/140 MHz)
±1 to ±200 kHz, Symbol rate > 625 ksps (L-Band)
±1 to ± 32 kHz, 64 ksps < Symbol Rate <=625 ksps (L-Band)
±1 to ± (Symbol rate/2)kHz, Symbol Rate <=64ksps (L-Band)
Programmable in 1 kHz increments.
Highly dependent on data rate, FEC rate, and demodulator acquisition range.
Acquisition time
Note that Reed-Solomon increases acquisition time, due to the additional time taken for the
RS decoder to declare synchronization.
± 100 ppm min
Clock tracking range
VITERBI
BER performance
(met in the presence
of two adjacent
For:
carriers, each 7 dB
BER=10
higher than the
desired carrier)
BER=10
BER=10
VITERBI and RS
220,200 or 200,180
Outer Code BER
(with two adjacent
For:
carriers, each 7 dB
BER=10
higher than the
desired carrier)
BER=10
BER=10
Rate 1/2 (B, Q)
Guaranteed Eb/No:
(typical value in
parentheses)
-5
5.4 dB (4.9 dB)
-6
6.0 dB (5.5 dB)
-7
6.7 dB (6.2 dB)
Rate 1/2 (B, Q)
Guaranteed Eb/No:
(typical value in
parentheses)
-5
4.3 dB (4.0 dB)
-6
4.4 dB (4.1 dB)
-7
4.5 dB (4.2 dB)
A–3
Rate 3/4 (Q)
Guaranteed Eb/No:
(typical value in
parentheses)
6.8 dB (6.3 dB)
7.4 dB (6.9 dB)
8.2 dB (7.7 dB)
Rate 3/4 (Q)
Guaranteed Eb/No:
(typical value in
parentheses)
5.6 dB (4.7 dB)
5.8 dB (4.8 dB)
6.0 dB (5.2 dB)
Revision 6
MN/CDMQx.IOM
Rate 7/8 (Q)
Guaranteed Eb/No:
(typical value in
parentheses)
7.7 dB (7.2 dB)
8.4 dB (7.9 dB)
9.0 dB (8.6 dB)
Rate 7/8 (Q)
Guaranteed Eb/No:
(typical value in
parentheses)
6.5 dB (6.0 dB)
6.7 dB (6.2 dB)
6.9 dB (6.5 dB)
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