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CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier®
Introduction
TURBO PRODUCT
CODEC
Rate 7/8 QPSK
Rate 7/8 8-PSK
Rate 7/8 16-QAM
BER
(with two adjacent
carriers, each 7 dB
higher than the
desired carrier)
TURBO PRODUCT
CODEC
Rate 17/18 QPSK
Rate 17/18 8-PSK
BER
(with two adjacent
carriers, each 7 dB
higher than the
desired carrier)
HIGHER-ORDER
MODULATION AND
CODING
(with two adjacent
carriers, each 7 dB
higher than the
desired carrier)
Plesiochronous /
Doppler Buffer
Monitor Functions
Rate 7/8 (Q)
Guaranteed Eb/No:
(typical value in
parentheses)
For:
-6
4.3 dB (4.0 dB)
BER=10
-7
4.4 dB (4.1 dB)
BER=10
-8
4.5 dB (4.2 dB)
BER=10
Rate 17/18 (Q)
Guaranteed Eb/No:
(typical value in
For:
parentheses)
-6
BER=10
6.4 dB (6.0 dB)
-7
BER=10
6.7 dB (6.3 dB)
-8
BER=10
6.9 dB (6.5 dB)
16-QAM Rate 3/4
Viterbi/RS
Guaranteed Eb/No:
(typical value in
parentheses)
For:
-6
8.1 dB (7.5 dB)
BER=10
-8
8.6 dB (8.0 dB)
BER=10
Selectable size of 512, 1024, 2048, 4096, 8192, 16384 and a32768 bits
Size selection is displayed in bytes
Supports asymmetric operation - when buffer is clocked from Tx clock, Rx and Tx rates do
not need to be identical
Eb/No estimate, 2 to 16 dB (± 0.10 dB accuracy)
Corrected Bit Error Rate, 1E-3 to 1E-10
Frequency offset, ± 32 kHz range, 100 Hz resolution (70/140 MHz IF)
Frequency offset, ± 200 kHz range, 100 Hz resolution (L-Band)
Buffer fill state, in percent
Receive signal level accuracy = ± 3.0 dB)
Rate 7/8 (8-PSK)
Guaranteed Eb/No:
(typical value in
parentheses)
7.3 dB (6.6 dB)
7.4 dB (6.7 dB)
7.5 dB (6.8 dB)
Rate 17/18 (8-PSK)
Guaranteed Eb/No:
(typical value in
parentheses)
9.3 dB (8.9 dB)
9.8 dB (9.4 dB)
10.3 dB (9.9 dB)
16-QAM Rate 7/8
Viterbi/RS
Guaranteed Eb/No:
(typical value in
parentheses)
9.5 dB (9.0 dB)
10.1 dB (9.5 dB)
1–17
Revision 7
MN/CDMQx.IOM
Rate 7/8 (16-QAM)
Guaranteed Eb/No:
(typical value in
parentheses)
8.1 dB (7.7 dB)
8.2 dB (7.8 dB)
8.3 dB (7.9 dB)
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