Errata a, Comtech efdata documentation update, Comments – Comtech EF Data SDM-9000 User Manual
Page 3: Change specifics
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Errata A
Comtech EFData Documentation Update
Subject:
Added 8PSK and 16QAM information
Date:
June 6, 2000
Document:
SDM-9000 Satellite Modem Installation and Operation Manual
Part Number MN/SDM9000.IOM Rev. 4 dated May 5, 1997
Part Number:
MN/SDM9000.EA4
Collating Instructions:
Attach this page to page 1-16
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 Eb/N0 required to achieve 10
-6
to
10
-9
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.
Table 1-4. 8PSK and 16QAM BER Data
Specification
Without IDR
With IDR
8PSK
8PSK
16QAM
16QAM
8PSK
8PSK
16QAM
16QAM
BER
2/3 Rate
5/6 Rate
3/4 Rate
7/8 Rate
2/3 Rate
5/6 Rate
¾ Rate
7/8 Rate
10-6
6.1 dB
8.2 dB
8.3 dB
9.8 dB
6.5 dB
8.6 dB
8.7 dB
10.2 dB
10-7
6.4 dB
8.5 dB
8.5 dB
10.0 dB
6.9 dB
8.9 dB
8.9 dB
10.4 dB
10-8
6.6 dB
8.9 dB
8.7 dB
10.3 dB
7.1 dB
9.3 dB
9.1 dB
10.7 dB
10-9
6.9 dB
9.3 dB
8.9 dB
10.5 dB
7.4 dB
9.7 dB
9.4 dB
10.9 dB
Typical
Typical
8PSK
8PSK
16QAM
16QAM
8PSK
8PSK
16QAM
16QAM
BER
2/3 Rate
5/6 Rate
3/4 Rate
7/8 Rate
2/3 Rate
5/6 Rate
3/4 Rate
7/8 Rate
10-6
5.6 dB
7.7 dB
7.8 dB
9.4 dB
5.9 dB
8.1 dB
8.2 dB
9.8 dB
10-7
5.8 dB
7.9 dB
8.1 dB
9.7 dB
6.2 dB
8.3 dB
8.5 dB
10.1 dB
10-8
6.1 dB
8.4 dB
8.3 dB
9.9 dB
6.5 dB
8.9 dB
8.7 dB
10.3 dB
10-9
6.3 dB
8.7 dB
8.6 dB
10.2 dB
6.7 dB
9.1 dB
9.0 dB
10.6 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.