Table 3-3. Comparison Of All Comtech Ef Data Tpc And Ldpc Modes - Comtech EF Data DMD-2050E Installation And Operation Manual

DMD2050E Universal Satellite Modem

Table 3-3. Comparison of all Comtech EF Data TPC and LDPC Modes

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 21/44 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/8-QAM Rate 3/4 TPC
8-PSK/8-QAM Rate 7/8 TPC
8-PSK/8-QAM 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
DMD2050E transmit filtering.
** Included for comparative purposes
MN-DMD2050E Revision 2
(DMD2050E with LDPC/TPC Codec)
Eb/No at Eb/No at
BER = 10 BER = 10
-6 -8
(typical) (typical)
5.5 dB 6.8 dB
1.7 dB 1.9 dB
2.8 dB 3.0 dB
2.4 dB 3.0 dB
1.7 dB 1.9 dB
2.8 dB 3.3 dB
2.1 dB 2.4 dB
2.7 dB 2.9 dB
3.4 dB 4.0 dB
4.2 dB 4.3 dB
6.0 dB 6.5 dB
5.6 dB 6.2 dB
4.3 dB 4.6 dB
4.7 dB 5.0 dB
6.1 dB 6.7 dB
6.7 dB 6.9 dB
9.2 dB 10.2 dB
6.7 dB 6.8 dB
7.4 dB 8.1 dB
7.9 dB 8.1 dB
7.5 dB 8.0 dB
9.0 dB 9.5 dB
Spectral Efficiency
Symbol Rate
(bps per Hertz)
1.00 bps/Hz 1.0 x bit rate
0.50 bps/Hz 2.0 x bit rate
0.48 bps/Hz 2.1 x bit rate
0.31 bps/Hz 3.2 x bit rate
1.00 bps/Hz 1.0 x bit rate
0.96 bps/Hz 1.05 x bit rate 1246 kHz
1.33 bps/Hz 0.75 x bit rate 892 kHz
1.50 bps/Hz 0.67 x bit rate 793 kHz
1.50 bps/Hz 0.67 x bit rate 793 kHz
1.75 bps/Hz 0.57 x bit rate 678 kHz
1.90 bps/Hz 0.53 x bit rate 626 kHz
1.82 bps/Hz 0.56 x bit rate 666 kHz
2.00 bps/Hz 0.50 x bit rate 595 kHz
2.25 bps/Hz 0.44 x bit rate 529 kHz
2.25 bps/Hz 0.44 x bit rate 529 kHz
2.62 bps/Hz 0.38 x bit rate 453 kHz
2.85 bps/Hz 0.35 x bit rate 377 kHz
3.00 bps/Hz 0.33 x bit rate 396 kHz
3.00 bps/Hz 0.33 x bit rate 396 kHz
3.50 bps/Hz 0.28 x bit rate 340 kHz
2.73 bps/Hz 0.37 x bit rate 435 kHz
3.18 bps/Hz 0.31 x bit rate 374 kHz
Theory of Operation
Occupied * Bandwidth
for 1 Mbps Carrier
1190 kHz
2380 kHz
2493 kHz
3808 kHz
1190 kHz
3–55