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Comtech EF Data CDM-570 User Manual

Page 179

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CDM-570/570L Satellite Modem with Optional IP Module

Revision 12

Forward Error Correction Options

MN/CDM570L.IOM

8–13

1E-9

1E-8

1E-7

1E-6

1E-5

1E-4

1E-3

1E-2

1E-1

1 2 3 4 5 6 7 8 9 10 11 12

Eb/No in dB

Uncoded

BPSK/QPSK

Comtech Turbo Product Codec

Rate 3/4 QPSK/OQPSK,

8-PSK and 16-QAM

1 2 3 4 5 6 7 8 9 10 11 12

BER

Spec limit

Rate 3/4
16-QAM

Spec limit

Rate 3/4

8-PSK

Spec limit

Rate 3/4

QPSK/OQPSK

Typical performance

Uncoded

8-PSK

Uncoded

16-QAM

Figure 8-4. Rate 3/4 QPSK/OQPSK, 8-PSK AND 16-QAM Turbo

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