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Datum Systems PSM-500, 500H & 500L VSAT/SCPC Modem Specification

Rev. 0.86

A-12

8PSK Trellis Code Modulation Performance

The Trellis Code Modulation (TCM) codec is designed for and used only with 8PSK modulation. It

is not possible to operate TCM at any data rate other than 2/3 or in any modulation mode other

than 8PSK. Typical performance of TCM rate 2/3 in 8PSK with and without concatenated Reed-

Solomon is shown in the table below. All values shown are using the synchronous IESS-308

scrambler/descrambler. Significant changes in performance, positive and negative, are achieved

using different n, k and depth values.

8PSK TCM FEC Performance for 8PSK

Required Eb/No in dB dB - Typical

Rate -->

2/3

2/3 with R-S,

IESS-310

2/3 with R-S,

CT 220,200

BER 32000 32003 32005

1.00E-03

5.36 4.72 4.81

1.00E-04

6.26 4.90 5.03

1.00E-05

7.19 5.05 5.23

1.00E-06

8.04 5.18 5.37

1.00E-07

8.75 5.30 5.54

1.00E-08

9.40 5.41 5.68

1.00E-09

10.05 5.55 5.83

Datum Systems M500 Modem Performance

32000 - TCM 8PSK, Rate 2/3

32003 - TCM 8PSK, Rate 2/3, RS 3

32005 - TCM 8PSK, Rate 2/3, RS 5

22.533.544.555.566.577.588.599.51010.5

1E-10

1E-9

1E-8

1E-7

1E-6

1E-5

0.0001

0.001

0.01

0.1

Eb/No

BER

DATUM

SYSTEMS

TCM 8PSK

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 31 32

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