Comtech EF Data SDM-9000 Installation And Operation Manual page 3

Comtech EFData Documentation Update
Subject:
Date:
Document:
Part Number:
Collating Instructions:
Comments:
The following changes provide updated information for Section 1.4.3, Table 1-4, Figures
1-6 and 1-7. This information will be incorporated into the next revision.
Change Specifics:
1.4.3 8PSK and 16QAM (Viterbi Decoder and Reed-Solomon Codec)
The 8PSK and 16QAM specifications for the E b /N 0 required to achieve 10
-9
10 BER with the Viterbi decoder and Reed-Solomon Codec are shown in
Table 1-4. Refer to Figures 1-6 (8PSK) and 1-7 (16QAM) for the BER curves
with the Reed-Solomon option.
Without IDR
8PSK 8PSK
BER 2/3 Rate 5/6 Rate
10 -6
6.1 dB 8.2 dB
10 -7
6.4 dB 8.5 dB
10 -8
6.6 dB 8.9 dB
10 -9
6.9 dB 9.3 dB
8PSK 8PSK
BER 2/3 Rate 5/6 Rate
10 -6
5.6 dB 7.7 dB
10 -7
5.8 dB 7.9 dB
10 -8
6.1 dB 8.4 dB
10 -9
6.3 dB 8.7 dB
Note: Reed-Solomon parameters differ from open network and closed network. Open network
meets IESS-308 QPSK operation, using a 4-deep interleaver. Closed networks run different
Reed-Solomon parameters. A longer code word and an 8-deep interleaver is used, resulting in
better performance.
Errata A
Added 8PSK and 16QAM information
June 6, 2000
SDM-9000 Satellite Modem Installation and Operation Manual
Part Number MN/SDM9000.IOM Rev. 4 dated May 5, 1997
MN/SDM9000.EA4
Attach this page to page 1-16
Table 1-4. 8PSK and 16QAM BER Data
Specification
16QAM 16QAM
3/4 Rate 7/8 Rate
8.3 dB 9.8 dB
8.5 dB 10.0 dB
8.7 dB 10.3 dB
8.9 dB 10.5 dB
Typical
16QAM 16QAM
3/4 Rate 7/8 Rate
7.8 dB 9.4 dB
8.1 dB 9.7 dB
8.3 dB 9.9 dB
8.6 dB 10.2 dB
With IDR
8PSK 8PSK
2/3 Rate 5/6 Rate
6.5 dB 8.6 dB
6.9 dB 8.9 dB
7.1 dB 9.3 dB
7.4 dB 9.7 dB
Typical
8PSK 8PSK
2/3 Rate 5/6 Rate
5.9 dB 8.1 dB
6.2 dB 8.3 dB
6.5 dB 8.9 dB
6.7 dB 9.1 dB
-6
to
16QAM 16QAM
¾ Rate 7/8 Rate
8.7 dB 10.2 dB
8.9 dB 10.4 dB
9.1 dB 10.7 dB
9.4 dB 10.9 dB
16QAM 16QAM
3/4 Rate 7/8 Rate
8.2 dB 9.8 dB
8.5 dB 10.1 dB
8.7 dB 10.3 dB
9.0 dB 10.6 dB