beautypg.com

Comtech EF Data CDM-600/600L User Manual

Page 138

background image

CDM-600/600L Open Network Satellite Modem

Revision 3

Forward Error Correction Options

MN/CDM600L.IOM

6–18

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

Specification

Limit Rate 1/2

and 220,200

Outer Code

Uncoded BPSK/QPSK

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

BER

Sequential

with

concatenated

RS 220,200

Outer Code

512 kbps

Combined sync

threshold, demod

and Sequential

Decoder, Rate 1/2

Sync

threshold,

Rate 3/4

Specification

Limit Rate 3/4

and 220,200

Outer Code

Specification

Limit Rate 7/8

and 220,200

Outer Code

Sync

threshold,

Rate 7/8

Typical Performance













































Figure 6-6. Sequential with concatenated Reed-Solomon Outer Code