Premier Mounts CDM-600 specifications Viterbi with

CDM-600 Satellite Modem													Revision 7
Forward Error Correction Options												MN/CDM600.IOM
												Eb/No in dB
1	2		3	4	5	6	7	8	9		10	11		12
1E-1
										Viterbi with
				Uncoded BPSK/QPSK
									concatenated
1E-2										RS 220,200
										Outer Code
		Sync
	threshold,
	Rate 3/4

1E-3

Sync

threshold,

1E-4

Rate 7/8

1E-5

Combined sync

threshold, demod

and Viterbi

Decoder, Rate 1/2

1E-6

Specification

Limit Rate 1/2

and 220,200

1E-7

Outer Code

Specification

Limit

Rate 3/4

Typical performance

and 220,200

Outer Code

1E-8

Specification

Limit Rate 7/8

and 220,200

1E-9

Outer Code

1

2

3

4

5

6

7

8

9

10

11

12

BER

Figure 7-5. Viterbi with concatenated R-S Outer Code

7–17