Comtech EF Data CDM-625A - Page 62

CDM-625A Advanced Satellite Modem MN-CDM625A
Introduction Revision 4
1–20
VersaFEC-2 Short Block
CODEC BER
BPSK
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For BER=10
-X
Rate – Guaranteed Eb/No (typical value in parentheses)
BER=10
-4
BER=10
-8
Rate 0.489 BPSK
2.6 dB (2.3 dB)
3.2 dB (2.9 dB)
VersaFEC-2 Short Block
CODEC BER
QPSK
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
BER=10
-4
BER=10
-8
Rate 0.489 QPSK
2.3 dB (1.4 dB)
2.7 dB (1.6 dB)
Rate 0.537 QPSK
2.4 dB (2.1 dB)
2.0 dB (1.7 dB)
Rate 0.586 QPSK
2.5 dB (2.2 dB)
3.0 dB (2.7 dB)
Rate 0.611 QPSK
2.6 dB (2.3 dB)
3.1 dB (2.8 dB)
BER=10
-4
BER=10
-8
Rate 0.635 QPSK
2.8 dB (2.5 dB)
3.2 dB (2.9 dB)
Rate 0.660 QPSK
2.9 dB (2.6 dB)
3.3 dB (3.0 dB)
Rate 0.684 QPSK
3.0 dB (2.7 dB)
3.4 dB (3.1 dB)
Rate 0.733 QPSK
3.4 dB (3.1 dB)
3.8 dB (3.5 dB)
VersaFEC-2 Short Block
CODEC BER
8-ARY
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
BER=10
-4
BER=10
-8
Rate 0.521 8-ARY
3.5 dB (3.2 dB)
4.0 dB (3.7 dB)
Rate 0.537 8-ARY
3.5 dB (3.2 dB)
4.1 dB (3.8 dB)
Rate 0.562 8-ARY
3.6 dB (3.6 dB)
4.2 dB (3.9 dB)
Rate 0.586 8-ARY
3.7 dB (3.4 dB)
4.2 dB (3.9 dB)
BER=10
-4
BER=10
-8
Rate 0.611 8-ARY
3.9 dB (3.6 dB)
4.3 dB (4.0 dB)
Rate 0.635 8-ARY
3.9 dB (3.6 dB)
4.4 dB (4.1 dB)
Rate 0.660 8-ARY
4.1 dB (3.8 dB)
4.5 dB (4.2 dB)
Rate 0.684 8-ARY
4.4 dB (4.1 dB)
4.7 dB (4.4 dB)
BER=10
-4
BER=10
-8
Rate 0.708 8-ARY
4.5 dB (4.2 dB)
4.8 dB (4.5 dB)
Rate 0.733 8-ARY
4.8 dB (4.5 dB)
5.2 dB (4.9 dB)
VersaFEC-2 Short Block
CODEC BER
16-ARY
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
BER=10
-4
BER=10
-8
Rate 0.586 16-ARY
4.8 dB (4.5 dB)
5.3 dB (5.0 dB)
Rate 0.611 16-ARY
5.0 dB (4.7 dB)
5.4 dB (5.1 dB)
Rate 0.635 16-ARY
5.3 dB (5.0 dB)
5.6 dB (5.3 dB)
Rate 0.660 16-ARY
5.5 dB (5.2 dB)
5.8 dB (5.5 dB)
BER=10
-4
BER=10
-8
Rate 0.684 16-ARY
5.7 dB (5.4 dB)
6.2 dB (5.9 dB)
Rate 0.708 16-ARY
6.1 dB (5.8 dB)
6.5 dB (6.2 dB)
Rate 0.733 16-ARY
6.2 dB (5.9 dB)
6.6 dB (6.3 dB)
Rate 0.757 16-ARY
6.7 dB (6.4 dB)
7.1 dB (6.8 dB)
BER=10
-4
BER=10
-8
Rate 0.782 16-ARY
7.0 dB (6.7 dB)
7.5 dB (7.2 dB)
VersaFEC-2 Short Block
CODEC BER
32-ARY
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
BER=10
-4
BER=10
-8
Rate 0.660 32-ARY
7.3 dB (7.0 dB)
7.9 dB (7.6 dB)
Rate 0.684 32-ARY
7.5 dB (7.2 dB)
8.1 dB (7.8 dB)
Rate 0.708 32-ARY
7.7 dB (7.4 dB)
8.2 dB (7.9 dB)
Rate 0.733 32-ARY
8.2 dB (7.9 dB)
8.7 dB (8.4 dB)
BER=10
-4
BER=10
-8
Rate 0.757 32-ARY
8.4 dB (8.1 dB)
8.9 dB (8.6 dB)
Rate 0.782 32-ARY
8.7 dB (8.4 dB)
9.2 dB (8.9 dB)
Rate 0.801 32-ARY
9.1 dB (8.8 dB)
9.5 dB (9.2 dB)
Rate 0.831 32-ARY
9.5 dB (9.2 dB)
9.9 dB (9.6 dB)
Ultra-Low-Latency (ULL)
CODEC BER
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
BER=10
-5
BER=10
-8
Rate 0.493 BPSK
3.1 dB (2.8 dB)
3.7 dB (3.4 dB)
Rate 0.493 QPSK
3.1 dB (2.8 dB)
3.7 dB (3.4 dB)
Rate 0.654 QPSK
3.6 dB (3.3 dB)
4.2 dB (3.9 dB)
Rate 0.734 QPSK
4.1 dB (3.8 dB)
4.7 dB (4.4 dB)
Notes:
1) Rate 21/44 QPSK is shown as Rate 1/2 on the Front Panel display, etc.
2) The demod acquisition and tracking threshold for OQPSK is approx 1 dB worse than the QPSK
case in this mode.