19
Power & Bandwidth Tradeoffs Example
Same Throughput Ù Less Power
Same Power Ù Less Bandwidth
•
DVB-S versus DVB-S2
–
Lower Eb/No requires less power
–
Higher efficiency uses less bandwidth
2.8
1.49
QPSK 3/4
5.3
1.38
DVB-S
Viterbi +
RS
DVB-S2
LDPC
Coding
Eb/No (dB)
Bandwidth Efficiency (bps/ Hz)
5.1
2.23
8PSK 3/4
Not
Available
DVB-S
Viterbi +
RS
DVB-S2
LDPC
Coding
LDPC
Less
BW
LDPC: Less Power
DVB‐S
DVB‐S
DVB‐S2
DVB‐S2
B
B
A
A
Comtech Proprietary & Confidential
A ≈Same Throughput Ù Less Power
Eb/No from 5.3 dB to 2.8 dB
B ≈Same Power Ù Less Bandwidth
SE from 1.38 bps/Hz vs 2.23 bps/Hz
A ≈Same Throughput Ù Less Power
Eb/No from 5.3 dB to 2.8 dB
B ≈Same Power Ù Less Bandwidth
SE from 1.38 bps/Hz vs 2.23 bps/Hz
