Datum Systems PSM-500L Manual do Utilizador descarregar pdf (Página 10)

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

Rev. 0.86

A-10

Viterbi FEC Performance for BPSK, QPSK and OQPSK with and without Reed-Solomon

Required Eb/No in dB dB - Typical

Rate -->

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

RS Opt--> None 1 2 5 None 1 2 5 None 1 2 5 None 1 2 5

BER

11000 11001 11002 11005 11010 11011 11012 11015 11020 11021 11022 11025 11030 11031 11032 11035

1.00E-03 3.09 2.33 2.36 2.28 3.94 3.36 3.39 3.33 4.49 4.01 4.03 3.97 4.90 4.44 4.52 4.66

1.00E-04 3.84 2.52 2.53 2.46 4.70 3.57 3.58 3.52 5.25 4.23 4.22 4.18 5.62 4.73 4.73 4.68

1.00E-05 4.52 2.67 2.67 2.60 5.40 3.75 3.74 3.68 5.98 4.43 4.41 4.35 6.32 4.94 4.91 4.86

1.00E-06 5.12 2.82 2.80 2.73 6.04 3.91 3.89 3.82 6.66 4.60 4.57 4.50 7.01 5.14 5.10 5.03

1.00E-07 5.66 2.95 2.92 2.84 6.65 4.06 4.03 3.96 7.27 4.78 4.73 4.66 7.66 5.33 5.26 5.20

1.00E-08 6.20 3.08 3.04 2.95 7.19 4.20 4.16 4.08 7.82 4.95 4.89 4.80 8.22 5.52 5.43 5.35

1.00E-09 6.65 3.22 3.14 3.05 7.66 4.35 4.28 4.19 8.35 5.12 5.07 4.94 8.78 5.70 5.61 5.49

Waterfall curves for the common Viterbi FEC at various Code Rates for BPSK, QPSK, OQPSK

modulation modes are shown in the graphs below.

Datum Systems M500 Modem Performance

11000 - Vit, Rate 1/2

11005 - Vit Rate 1/2, RS - 5

11010 - Vit Rate 3/4

11015 - Vit Rate 3/4, RS 5

11020 - Vit Rate 5/6

11025 - Vit Rate 5/6, RS 5

11030 - Vit Rate 7/8

11035 - Vit Rate 7/8, RS 5

0.5 1 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

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 BPSK/QPSK/OQPSK

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 31 32

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