Comtech EF Data CDM-625 - Page 58

CDM-625 Advanced Satellite Modem Revision 13
Introduction MN-CDM625
1–18
SEQUENTIAL and RS 220,200
Outer Code
at 512 kbps
BER performance (with two
adjacent carriers, each 7 dB
higher than the desired carrier)
For:
BER=10
-4
BER=10
-6
BER=10
-8
Rate 1/2 (B, Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
4.5 dB (4.1 dB)
4.7 dB (4.3 dB)
4.9 dB (4.6 dB)
Rate 3/4 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
5.0 dB (4.6 dB)
5.2 dB (4.8 dB)
5.4 dB (5.0 dB)
Rate 7/8 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
5.9 dB (5.5 dB)
6.1 dB (5.7 dB)
6.3 dB (5.9 dB)
TURBO PRODUCT CODEC
BER
Rate 21/44 B/Q/OQPSK
Rate 5/16 BPSK
BER (with two adjacent
carriers, each 7 dB higher than
the desired carrier)
For:
BER=10
-6
BER=10
-7
BER=10
-8
Rate 21/44 (B, Q, OQ)*
Guaranteed Eb/No:
(typical value in parentheses)
3.1 dB (2.9 dB)
3.3 dB (3.1 dB)
3.5 dB (3.3 dB)
Rate 5/16 (B)
Guaranteed Eb/No:
(typical value in parentheses)
2.7 dB (2.5dB)
2.9 dB (2.7dB)
3.1 dB (2.9dB)
* See Notes 1 and 2 (below)
TURBO PRODUCT CODEC
BER
Rate 3/4 QPSK
Rate 3/4 8PSK/8-QAM
Rate 3/4 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 3/4 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
3.8dB (3.4dB)
4.1dB (3.7dB)
4.4dB (4.0dB)
Rate 3/4 (8PSK, 8-QAM)
Guaranteed Eb/No:
(typical value in parentheses)
6.4 dB (6.0 dB)
6.7 dB (6.3 dB)
7.1 dB (6.7 dB)
Rate 3/4 (16-QAM)
Guaranteed Eb/No:
(typical value in parentheses)
7.8 dB (7.4 dB)
8.1 dB (7.7 dB)
8.5 dB (8.2 dB)
TURBO PRODUCT CODEC
BER
Rate 7/8 QPSK
Rate 7/8 8PSK/8-QAM
Rate 7/8 16-QAM
BER (with two adjacent
carriers, each 7 dB higher than
the desired carrier)
For:
BER=10
-5
BER=10
-8
Rate 7/8 (Q, OQ)
Guaranteed Eb/No:
(typical value in parentheses)
4.3 dB (4.0 dB)
4.5 dB (4.2 dB)
Rate 7/8 (8PSK, 8-QAM)
Guaranteed Eb/No:
(typical value in parentheses)
7.0 dB (6.7 dB)
7.2 dB (6.8 dB)
Rate 7/8 (16-QAM)
Guaranteed Eb/No:
(typical value in parentheses)
8.1 dB (7.7 dB)
8.4 dB (8.1 dB)
TURBO PRODUCT CODEC
BER
Rate 0.95 QPSK
Rate 0.95 8PSK/8-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 0.95 (Q, OQ)
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 0.95 (8PSK, 8-QAM)
Guaranteed Eb/No:
(typical value in parentheses)
9.6 dB (9.2 dB)
10.1 dB (9.7 dB)
10.6 dB (10.2 dB)
LDPC CODEC BER
Rate 1/2 B/Q/OQPSK
Rate 2/3 Q/OQPSK
Rate 1/2 Q/OQPSK
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
* See Note 2
For:
BER=10
-5
BER=10
-9
BPSK/QPSK/OQPSK* Rate 1/2
LDPC
Guaranteed Eb/No:
(typical value in parentheses)
2.0 dB (1.7 dB)
2.3 dB (2.0 dB)
QPSK/OQPSK
Rate 2/3 LDPC
Guaranteed Eb/No:
(typical value in parentheses)
2.3 dB (2.0 dB)
2.7 dB (2.3 dB)
QPSK/OQPSK
Rate 3/4 LDPC
Guaranteed Eb/No:
(typical value in parentheses)
3.0 dB (2.6 dB)
3.3 dB (3.0 dB)
LDPC CODEC BER
Rate 2/3 8PSK
Rate 3/4 8PSK
(With two adjacent carriers,
each 7 dB higher than the
desired carrier)
For:
BER=10
-5
BER=10
-9
8PSK Rate 2/3 LDPC
Guaranteed Eb/No:
(typical value in parentheses)
---
5.7 dB (5.2 dB)
8PSK Rate 3/4 LDPC
Guaranteed Eb/No:
(typical value in parentheses)
5.6 dB (5.2 dB)
6.0 dB (5.6 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.