Datum Systems PSM-500L Manuel d'utilisateur télécharger pdf (Page 11)

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

Rev. 0.86

A-11

16QAM Modulation Viterbi FEC Performance

Waterfall curves for the common Viterbi FEC at the available Code Rates for 16QAM modulation

modes are shown in the graphs below. TPC 16QAM performance is shown with the TPC FEC data

later.

Viterbi FEC Performance for 16QAM with and without Reed-Solomon

Required Eb/No in dB dB - Typical

Rate -->

1/2 3/4 5/6 7/8

RS Opt--> None 4 None 4 CT-5 None 4 None 4 CT-5

BER 61000 61004 61010 61014 61215 61020 61024 61030 61034 61235

1.00E-03 5.65 5.13 7.24 6.68 6.60 7.92 7.49 8.46 7.96

1.00E-04 6.38 5.38 8.08 6.93 6.79 8.74 7.75 9.24 8.18

1.00E-05 7.02 5.57 8.89 7.15 6.95 9.51 8.00 10.01 8.40

1.00E-06 7.65 5.70 9.62 7.35 7.12 10.23 8.23 10.72 8.60

1.00E-07 8.23 5.84 10.28 7.54 7.26 10.92 8.45 11.33 8.79

1.00E-08 8.75 5.97 10.87 7.72 7.39 11.53 12.15 11.98 8.96

1.00E-09 9.24 6.11 11.47 7.91 7.53 12.02 20.67 12.54 9.13

Datum Systems M500 Modem Performance

61000 - Vit 16QAM, Rate 1/2

61004 - Vit 16QAM, Rate 1/2, RS 4

61010 - Vit 16QAM, Rate 3/4

61015 - Vit 16QAM, Rate 3/4, RS 5

61020 - Vit 16QAM, Rate 5/6

61025 - Vit 16QAM, Rate 5/6, RS 5

61030 - Vit 16QAM, Rate 7/8

61035 - Vit 16QAM, Rate 7/8, RS 5

1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13

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

Viterbi 16QAM

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 31 32

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Datum Systems PSM-500L Manuel d'utilisateur Page 11

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