Table of Contents
Advertisement
CDM-600L Satellite Modem
Forward Error Correction Options
(CDM-600L with LDPC/TPC Codec and Firmware Version 1.3.0)
Mode
QPSK Rate 1/2 Viterbi *
BPSK Rate 1/2 LDPC
BPSK Rate 21/44 TPC
BPSK Rate 5/16 TPC
QPSK/OQPSK Rate 1/2 LDPC
QPSK/OQPSK Rate 1/2 TPC
QPSK/OQPSK Rate 2/3 LDPC
QPSK/OQPSK Rate 3/4 LDPC
QPSK/OQPSK Rate 3/4 TPC
QPSK/OQSK Rate 7/8 TPC
QPSK/OQPSK Rate 0.95 TPC
8-PSK Rate 2/3 TCM **
and RS (IESS-310)
8-QAM Rate 2/3 LDPC
8-QAM Rate 3/4 LDPC
8-PSK Rate 3/4 TPC
8-PSK Rate 7/8 TPC
8-PSK Rate 0.95 TPC
16-QAM Rate 3/4 LDPC
16-QAM Rate 3/4 TPC
16-QAM Rate 7/8 TPC
16-QAM Rate 3/4 **
Viterbi/Reed-Solomon
16-QAM Rate 7/8 **
Viterbi/Reed-Solomon
* The occupied bandwidth is defined at the width of the transmitted spectrum taken at the –10 dB points on
the plot of power spectral density. This equates to 1.19 x symbol rate for the CDM-600L transmit filtering.
** Included for comparative purposes
Comparison of all Comtech EF Data TPC and LDPC Modes
Eb/No at
-6
BER = 10
(typical)
5.5 dB
1.7 dB
2.6 dB
2.1 dB
1.7 dB
2.6 dB
2.1 dB
2.7 dB
3.3 dB
4.0 dB
6.0 dB
5.6 dB
4.3 dB
4.7 dB
5.7 dB
6.6 dB
8.9 dB
6.4 dB
7.0 dB
7.7 dB
7.5 dB
9.0 dB
Spectral
Eb/No at
Efficiency
-8
BER = 10
(bps per
(typical)
Hertz)
6.8 dB
1.00 bps/Hz
1.9 dB
0.50 bps/Hz
2.9 dB
0.48 bps/Hz
2.4 dB
0.31 bps/Hz
1.9 dB
1.00 bps/Hz
2.8 dB
0.96 bps/Hz
2.3 dB
1.33 bps/Hz
2.9 dB
1.50 bps/Hz
4.0 dB
1.50 bps/Hz
4.2 dB
1.75 bps/Hz
6.5 dB
1.90 bps/Hz
6.2 dB
1.82 bps/Hz
4.5 dB
2.00 bps/Hz
5.0 dB
2.25 bps/Hz
6.3 dB
2.25 bps/Hz
6.8 dB
2.62 bps/Hz
9.9 dB
2.85 bps/Hz
6.6 dB
3.00 bps/Hz
7.7 dB
3.00 bps/Hz
7.9 dB
3.50 bps/Hz
8.0 dB
2.73 bps/Hz
9.5 dB
3.18 bps/Hz
7–10
Revision 2
MN/CDM600L.IOM
Occupied *
Bandwidth
Symbol Rate
for 1 Mbps
Carrier
1.0 x bit rate
1190 kHz
2.0 x bit rate
2380 kHz
2.1 x bit rate
2493 kHz
3.2 x bit rate
3808 kHz
1.0 x bit rate
1190 kHz
1.05 x bit rate
1246 kHz
0.75 x bit rate
892 kHz
0.67 x bit rate
793 kHz
0.67 x bit rate
793 kHz
0.57 x bit rate
678 kHz
0.53 x bit rate
626 kHz
0.56 x bit rate
666 kHz
0.50 x bit rate
595 kHz
0.44 x bit rate
529 kHz
0.44 x bit rate
529 kHz
0.38 x bit rate
453 kHz
0.35 x bit rate
377 kHz
0.33 x bit rate
396 kHz
0.33 x bit rate
396 kHz
0.28 x bit rate
340 kHz
0.37 x bit rate
435 kHz
0.31 x bit rate
374 kHz
Advertisement
Table of Contents
