CDM-625A Advanced Satellite Modem
MN-CDM625A
Appendix B
Revision 4
B–11
Table B-6. Comparison of all Comtech EF Data TPC/LDPC Modes (CDM-625A with
TPC/LDPC Codec)
Mode
Eb/No at
BER = 10
-6
(typical)
Eb/No at
BER = 10
-8
(typical)
Spectral
Efficiency
(bps per Hz)
Symbol Rate
Occupied *
Bandwidth for
1 Mbps Carrier
QPSK Rate 1/2 Viterbi
**
5.5 dB
6.8 dB
1.00 bps/Hz
1.0 x bit rate
1190 kHz
BPSK Rate 1/2 LDPC
1.7 dB
1.9 dB
0.50 bps/Hz
2.0 x bit rate
2380 kHz
BPSK Rate 21/44 TPC
2.8 dB
3.0 dB
0.48 bps/Hz
2.1 x bit rate
2493 kHz
BPSK Rate 5/16 TPC
2.4 dB
3.0 dB
0.31 bps/Hz
3.2 x bit rate
3808 kHz
QPSK/OQPSK Rate 1/2 LDPC
1.7 dB
1.9 dB
1.00 bps/Hz
1.0 x bit rate
1190 kHz
QPSK/OQPSK Rate 21/44 TPC
2.8 dB
3.3 dB
0.96 bps/Hz
1.05 x bit rate
1246 kHz
QPSK/OQPSK Rate 2/3 LDPC
2.1 dB
2.4 dB
1.33 bps/Hz
0.75 x bit rate
892 kHz
QPSK/OQPSK Rate 3/4 LDPC
2.7 dB
2.9 dB
1.50 bps/Hz
0.67 x bit rate
793 kHz
QPSK/OQPSK Rate 3/4 TPC
3.4 dB
4.0 dB
1.50 bps/Hz
0.67 x bit rate
793 kHz
QPSK/OQSK Rate 7/8 TPC
4.2 dB
4.3 dB
1.75 bps/Hz
0.57 x bit rate
678 kHz
QPSK/OQPSK Rate 0.95 TPC
6.0 dB
6.5 dB
1.90 bps/Hz
0.53 x bit rate
626 kHz
8-PSK Rate 2/3 TCM
**
and RS (IESS-310)
5.6 dB
6.2 dB
1.82 bps/Hz
0.56 x bit rate
666 kHz
8-QAM Rate 2/3 LDPC
4.3 dB
4.6 dB
2.00 bps/Hz
0.50 x bit rate
595 kHz
8-QAM Rate 3/4 LDPC
5.3 dB
5.5 dB
2.25 bps/Hz
0.44 x bit rate
529 kHz
8-PSK/8-QAM Rate 3/4 TPC
6.1 dB
6.7 dB
2.25 bps/Hz
0.44 x bit rate
529 kHz
8-PSK/8-QAM Rate 7/8 TPC
6.7 dB
6.9 dB
2.62 bps/Hz
0.38 x bit rate
453 kHz
8-PSK/8-QAM Rate 0.95 TPC
9.2 dB
10.2 dB
2.85 bps/Hz
0.35 x bit rate
377 kHz
16-QAM Rate 3/4 LDPC
6.7 dB
6.8 dB
3.00 bps/Hz
0.33 x bit rate
396 kHz
16-QAM Rate 3/4 TPC
7.4 dB
8.1 dB
3.00 bps/Hz
0.33 x bit rate
396 kHz
16-QAM Rate 7/8 TPC
7.9 dB
8.1 dB
3.50 bps/Hz
0.28 x bit rate
340 kHz
16-QAM Rate 3/4
**
Viterbi/Reed-Solomon
7.5 dB
8.0 dB
2.73 bps/Hz
0.37 x bit rate
435 kHz
16-QAM Rate 7/8
**
Viterbi/Reed-Solomon
9.0 dB
9.5 dB
3.18 bps/Hz
0.31 x bit rate
374 kHz
* 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-625A
transmit filtering.
** Included for comparative purposes
Содержание CDM-625A
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Страница 42: ...CDM 625A Advanced Satellite Modem MN CDM625A Preface Revision 4 xxxvi Notes...
Страница 82: ...CDM 625A Advanced Satellite Modem MN CDM625A Installation Revision 4 2 6 Notes...
Страница 118: ...CDM 625A Advanced Satellite Modem MN CDM625A Updating Firmware Revision 4 4 14 Notes...
Страница 124: ...CDM 625A Advanced Satellite Modem MN CDM625A FAST Activation Procedure Revision 4 5 6 Notes...
Страница 200: ...CDM 625A Advanced Satellite Modem MN CDM625A Front Panel Operation Revision 4 6 76 Figure 6 3 Loopback Modes...
Страница 230: ...CDM 625A Advanced Satellite Modem MN CDM625A Front Panel Operation Revision 4 6 106 Notes...
Страница 314: ...CDM 625A Advanced Satellite Modem MN CDM625A Ethernet based Remote Product Management Revision 4 7 84 Notes...
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