Comtech EF Data SDR-54A - Manual (Page 65)

SDR-54A Satellite Demodulator Revision 4
Specifications MN/SDR54A.IOM
8.2.1 Demodulation and FEC Decoding Types
The following combinations (Table 8-4) of demodulation and forward error correction
decoding are available:
Table 8-4. Demodulation and FEC Decoding Types
Decoder Code Rate Demodulation
Viterbi, K7 1/2 BPSK
Viterbi, K7
Reed-Solomon 1/2
225/205 BPSK
Viterbi, K7 1/2, 3/4, 7/8 QPSK
Viterbi, K7
Reed-Solomon 1/2, 3/4, 7/8
225/205 QPSK
Note: Hardware designed to attempt to support programmable R-S Code words.
8.2.2 BPSK and QPSK BER Performance with Noise
BER performance for the receiver for QPSK and BPSK modulation types is shown in
Table 8-5 and Figure 8-1.
Table 8-5. BPSK and QPSK BER Performance
E
b
/N
0
(dB) Specification
BER 1/2 Rate 3/4 Rate 7/8 Rate
10 -3 N/A 5.2 6.4
10 -4 4.8 6.0 7.2
10 -5 5.5 6.7 7.9
10 -6 6.1 7.5 8.6
10 -7 6.7 8.2 9.2
10 -8 7.2 8.8 9.9
8.2.3 QPSK and BPSK Performance with Noise and Reed-Solomon
BER performance for the receiver for QPSK and BPSK modulation type with Reed-
Solomon is shown in Table 8-6).
Table 8-6. QPSK and BPSK BER Performance with Reed-Solomon
E
b
/N
0
(dB) Specification
BER 1/2 Rate 3/4 Rate 7/8 Rate
10 -6 N/A 5.6 6.7
10 -7 N/A 5.8 6.9
10 -8 N/A 6.0 7.1
10 -10 5.0 6.3 7.5
8–5