Ericsson RX8000 - Page 480

Technical Specification
B-20
EN/LZT 790 0005 R7A
Table B.20 shows the Eb/No requirements for DVB-S and Table B.21 for DVB-S2
Es/No requirements to ensure error-free demodulation for all supported FEC rates.
Table B.20 DVB-S2 Satellite Input – DVB-S Eb/No Ratio
Convolutional FEC
Rate
Eb/No Ratio (dB) in IF Loop for correct MPEG-2
system operation
1/2 4.5
2/3 5.0
3/4 5.5
5/6 6.0
7/8 6.4
Eb/No ratio is referred to user bit rate Ru188. See EN 300 421 specification. For
more detailed specification information and advice on performance in specific
applications, please contact Ericsson Customer Services.
Table B.21 DVB-S2 Satellite Input – DVB-S2 Es/No Ratio
LDPC FEC Rate
DVB-S2 Theoretical
6
Es/No Ratio (dB) in perfect
linear channel for correct MPEG-2 system operation
1/2 QPSK 1.00
3/5 QPSK 2.23
2/3 QPSK 3.10
3/4 QPSK 4.03
4/5 QPSK 4.68
5/6 QPSK 5.18
8/9 QPSK 6.20
9/10 QPSK 6.42
3/5 8PSK 5.50
2/3 8PSK 6.62
3/4 8PSK 7.91
5/6 8PSK 9.35
8/9 8PSK 10.69
9/10 8PSK 10.98
For more detailed specification information and advice on performance in specific
applications, please contact Ericsson Customer Services.
6
Add 0.2 dB (0.4 dB for FEC 3/5) to any system calculation for modulator – demodulator implementation margin