Table of Contents
Advertisement
CDD-562AL/564A/L Multi-Channel Demodulator
Forward Error Correction
As a comparison, looking at LDPC Rate 2/3 8-QAM and VersaFEC Rate 0.642 8-QAM essentially identical
spectral efficiency and Eb/No performance. However, at 64 kbps, the latency has been reduced from 350
milliseconds to 89 milliseconds – a factor of 4 reduction.
The performance of the VersaFEC codes compared with the Shannon bound is shown in Figure A-1. This
puts the performance of VersaFEC at or near the DVB-S2 performance with 16 kbit blocks.
Note that SNR is defined as Eb/No + 10
Figure A-1. VersaFEC Codes versus Shannon Capacity
(Spectral Efficiency).
log
A–4
Revision 0
MN-CDD562AL564AL
Advertisement
Table of Contents
