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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.