
CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Introduction MN/CDMQx.IOM
1–17
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)
For:
BER=10
-6
BER=10
-7
BER=10
-8
Rate 7/8 (Q)
Guaranteed Eb/No:
(typical value in
parentheses)
4.3 dB (4.0 dB)
4.4 dB (4.1 dB)
4.5 dB (4.2 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 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)
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)
For:
BER=10
-6
BER=10
-7
BER=10
-8
Rate 17/18 (Q)
Guaranteed Eb/No:
(typical value in
parentheses)
6.4 dB (6.0 dB)
6.7 dB (6.3 dB)
6.9 dB (6.5 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)
HIGHER-ORDER
MODULATION AND
CODING
(with two adjacent
carriers, each 7 dB
higher than the
desired carrier)
For:
BER=10
-6
BER=10
-8
16-QAM Rate 3/4
Viterbi/RS
Guaranteed Eb/No:
(typical value in
parentheses)
8.1 dB (7.5 dB)
8.6 dB (8.0 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)
Plesiochronous
Doppler Buffer
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
Monitor Functions
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)
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